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YANHAO
YANHAO
Flanges · Pipes · Fittings

Pipe Elbow

Our company provides All Kinds of Pipe Elbow

We provide Elbow products of various standards, such as American standards, European standards, German standards, and Japanese standards. The list of common standards is as follows:

  • ASME/ANSI B16.9、ASME/ANSI B16.11、ASME/ANSI B16.28;
  • JIS B2311、JIS B2312、JIS B2313、JIS B2316;
  • GB2000、D-GD87-1101、DL/T515-93;
  • SH3408-1996、SH3409-1996、SH3410-1996;
  • GOST-17375
  • GB/T10752-1995;
  • Customized Pipe Elbow
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Elbow

Industrial Pipe Elbow

Made in China Pipe Elbow, lower price, better quality!

Elbow could be ranged from direction angle, connection types, length and radius, material types.

  • by Direction Angle
  • by Connection Types
  • by Material

Classified by Direction Angle

The bend angle is defined as the theoretical angle between the inlet and outlet centerlines of a pipe elbow. Its precision critically determines the hydraulic efficiency and structural integrity of piping systems. Based on flow direction requirements, elbows are manufactured at standardized angles—primarily 45°, 90°, and 180° for most industrial applications, with 30° and 60° variants serving specialized configurations.

Industry-grade elbows must comply with international standards (ASME B16.9, EN 10253) that enforce angular tolerances within ±0.5°. This stringent control is critical to maintaining hydraulic stability and leak-free sealing reliability under operational pressures.

  • 90 deg long radius 2

90-Degree Elbow

The 90° elbow enables precise perpendicular flow direction changes in piping systems. Manufactured through ASME B16.9-compliant hot induction bending (for sizes >2″) or precision cold forming, it delivers optimal structural integrity for high-pressure applications. This industry-standard fitting is essential in refinery pipe racks, power plant steam lines, and API 610 pump discharge systems where space-efficient redirection is critical.

LR 90° Elbow

The LR 90° Elbow (R=1.5D) delivers smooth 90° flow redirection with 60% lower pressure drop versus SR types. Its extended curvature minimizes turbulence erosion, making it ideal for refinery transfer lines, API 610 pump connections, and high-pressure steam systems per ASME B31.1.

SR 90° Elbow

Engineered for confined spaces, the SR 90° Elbow (R=1.0D) achieves sharp directional change with 40% space reduction. This compact solution services marine engine room piping, deck drainage networks, and low-pressure utility steam lines where footprint optimization is critical.

  • 45 deg radius

45-Degree Elbow

Engineered for gradual flow transition, the 45° elbow reduces pressure drop by 60% compared to 90° elbows using CNC mandrel-bent geometry. Its electropolished surface finish (Ra≤1.6μm) and solution annealing process meet 3-A sanitary standards. This acute-angle solution is indispensable for compressor outlet piping, pharmaceutical transfer lines, and slurry transport systems requiring minimized turbulence.

LR 45° Elbow

Providing gradual 45° transition, the LR 45° Elbow (R=1.5D) reduces flow resistance by 55-65% compared to 90° elbows. Its optimized geometry is essential for compressor discharge piping, abrasive slurry systems, and sanitary process lines requiring minimal particle deposition.

SR 45° Elbow

The SR 45° Elbow (R=1.0D) combines acute-angle redirection with space efficiency. Designed for retrofit projects, it enables HVAC branch integrations, modular skid piping, and vessel platform tie-ins where conventional elbows cannot fit.

  • 180 deg long radius return bends

180-Degree Return Bend

This U-shaped 180° return bend achieves complete flow reversal in confined spaces. Fabricated via hot-stamp forming with full-body normalization and 100% radiographic testing (ASME Sec. V), its short-radius (1D) variant saves 40% installation space versus dual 90° elbows. Primary applications include TEMA-standard heat exchanger bundles, chemical reactor recirculation loops, and ABS-compliant marine engine rooms.

LR 180° Return Bend

Featuring a U-profile with R=1.5D curvature, the LR 180° Return Bend ensures low-turbulence flow reversal. This design dominates TEMA-type heat exchangers, chemical reactor recirculation loops, and boiler feed systems demanding minimal energy loss.

SR 180° Return Bend

The SR 180° Return Bend (R=1.0D) delivers complete flow reversal in ultra-compact layouts. Its short-radius U-configuration serves ABS-compliant ship bilge lines, tank farm transfer systems, and packaged equipment modules with severe space constraints.

Reducing Elbow

Combining directional change with pipe size transition, the reducing elbow features laser-profiled concentric/eccentric designs to prevent fluid trapping. Manufactured using spinning reduction technology per MSS SP-75, it maintains smooth bore continuity. This specialized fitting is critical for HI 9.6.7 pump suction systems, HVAC branch connections, and offshore platform risers requiring integrated diameter transition.

About Elbow Radius

Elbow radius indicates the radius of curvature. If the radius is the same as the pipe diameter, it is called a short radius elbow, also known as an SR elbow, which is usually used for low-pressure and low-speed pipelines. If the radius is larger than the pipe diameter, R ≥ 1.5 diameter, then we call it a long radius elbow (LR Elbow), which is suitable for high-pressure and high-flow pipelines.

ParameterLong Radius (LR)Short Radius (SR)Special Types
Radius Multiplier1.5 × NPS1.0 × NPS3D/5D: 3×/5× NPS
Pressure Drop▼ Low (12× straight pipe)▲ High (30× straight pipe)▼▼ Ultra-low (3D bend)
Space Requirement▲ Large footprint▼▼ 40% compact▲▼ Variable
Key ManufacturingHot induction bendingHot die pressingSegmented die bending
Wall Thinning (ASME)≤8%≤10%≤5% (FEA-optimized)
Critical ApplicationsRefinery HP lines
Slurry systems
Marine engine rooms
Low-pressure steam
Gas transmission (API 5L)
Pump anti-cavitation (HI)
Cost EfficiencyHigher base cost25% savings vs LRCustom pricing
Certification FocusNACE MR0175 (corrosion)ABS/NORSOK (space)PED 2014/68/EU

Classified by Connection Types

As per the connection mode, elbow could be classified by butt welded elbow, socket welded elbow and threaded elbow.

  • 对焊弯头

Butt Weld Elbows

Description

Permanent connection via full-penetration groove welding between beveled pipe and elbow ends (37.5° bevel per ANSI B16.25).

Features

Homogenous metallurgical bond (strength ≥95% base material)
Zero internal crevices preventing corrosion/pitting
Suitable for radiographic testing (RT)

Applications

High-pressure hydrocarbon pipelines (ASME B31.4) | Nuclear reactor coolant lines (ASME III) | Cryogenic tanks (-196°C)

90° Butt Weld Elbow specification (ASME B16.9)

NPSOD (mm)Radius TypeA (mm)R (mm)THK – SCH40 (mm)THK – SCH80 (mm)THK – SCH160 (mm)THK – XXS (mm)
1/2″21.3LR38322.773.734.787.47
1/2″21.3SR25212.773.734.787.47
3/4″26.7LR38402.873.915.567.82
3/4″26.7SR29272.873.915.567.82
1″33.4LR38503.384.556.359.09
1″33.4SR32333.384.556.359.09
1-1/2″48.3LR57723.685.087.1410.15
1-1/2″48.3SR38483.685.087.1410.15
2″60.3LR76903.915.548.7411.07
2″60.3SR41603.915.548.7411.07
3″88.9LR1141335.497.6211.1315.24
3″88.9SR64895.497.6211.1315.24
4″114.3LR1521716.028.5613.4917.12
4″114.3SR761146.028.5613.4917.12
6″168.3LR2292527.1110.9718.2621.95
6″168.3SR1141687.1110.9718.2621.95
8″219.1LR3053298.1812.723.0125.4
8″219.1SR1522198.1812.723.0125.4
10″273LR3814109.2715.0928.5828.58
10″273SR1902739.2715.0928.5828.58
12″323.8LR4574869.5317.4830.1830.18
12″323.8SR2293249.5317.4830.1830.18
14″355.6LR5335339.5318.8731.7531.75
14″355.6SR2673569.5318.8731.7531.75
16″406.4LR6106109.5320.6233.3233.32
16″406.4SR3054069.5320.6233.3233.32
18″457LR6866869.5321.4434.9334.93
18″457SR3434579.5321.4434.9334.93
20″508LR7627629.5322.2336.5336.53
20″508SR3815089.5322.2336.5336.53
24″610LR9149159.5325.438.138.1
24″610SR4576109.5325.438.138.1


45° Butt Weld Elbows specification (ASME B16.9)

NPSOD (mm)Radius TypeA (mm)R (mm)THK – SCH40 (mm)THK – SCH80 (mm)THK – SCH160 (mm)THK – XXS (mm)
1/2″21.3LR16322.773.734.787.47
3/4″26.7LR19402.873.915.567.82
1″33.4LR22503.384.556.359.09
1-1/2″48.3LR41723.685.087.1410.15
2″60.3LR44903.915.548.7411.07
3″88.9LR641335.497.6211.1315.24
4″114.3LR761716.028.5613.4917.12
6″168.3LR1142527.1110.9718.2621.95
8″219.1LR1523298.1812.723.0125.4
10″273LR1914109.2715.0928.5828.58
12″323.8LR2294869.5317.4830.1830.18
14″355.6LR2675339.5318.8731.7531.75
16″406.4LR3056109.5320.6233.3233.32
18″457LR3436869.5321.4434.9334.93
20″508LR3817629.5322.2336.5336.53
24″610LR4579159.5325.438.138.1
  • 承插焊弯头1

Socket Weld Elbows

Description

Pipe inserts into internal socket depression, secured by fillet welding the external collar.

Features

Axial gap allowance (1.5mm for thermal expansion)

No internal alignment requirement

Explosion-proof (no sparks vs threading)

Applications

Hydraulic instrumentation (≤DN50) | Steam tracing bundles | Chemical injection skids

ASME B16.11 Socket Weld Elbows specification – 90° Elbows

(Units: mm | Source: ASME B16.11-2021)

NPSOD (mm)Radius TypeClass 3000LBClass 6000LBClass 9000LBR (mm)Thickness (mm)
A (mm)A (mm)A (mm)Min / Avg
1/221.9SR15.519.515.521.93.73/4.09
3/427.3SR19.5––27.33.91/4.27
134.0SR22.0–20.534.04.55/4.98
1½48.6SR32.0––48.65.08/5.56
261.3SR38.041.028.561.35.54/6.04
2½73.7SR44.5––73.77.01/7.67
389.1SR51.0––89.17.62/8.33
4115.8SR66.5––115.88.56/9.35
  • Class 3000LB: Values shown
  • Class 6000LB: +28% thicker than 3000LB (e.g., NPS 1/2: Min 4.78/Avg 5.18)
  • Class 9000LB: +100% thicker than 3000LB (e.g., NPS 2: Min 11.07/Avg 12.12)

45° Socket Weld Elbows specification (ASME B16.9)

*(Units: mm | Source: ASME B16.11-2021)*

NPSOD (mm)Radius TypeClass 3000LBClass 6000LBClass 9000LBR (mm)Thickness (mm)
A (mm)A (mm)A (mm)Min / Avg
1/221.9SR11.512.5–21.93.73/4.09
3/427.3SR12.5––27.33.91/4.27
134.0SR14.0––34.04.55/4.98
1½48.6SR19.0––48.65.08/5.56
261.3SR25.029.0–61.35.54/6.04
2½73.7SR32.0––73.77.01/7.67
389.1SR38.0––89.17.62/8.33
  1. 45° Elbow Limitations:
    • No 9000LB class available for 45° elbows
    • Max size: NPS 3 (DN80)
  2. A-Dimension Variance:
    • 45° elbows have 30-40% shorter A-dimension vs 90° elbows
    • Higher pressure classes increase A-dimension (e.g., NPS 1/2: 3000LB=11.5mm → 6000LB=12.5mm)
  • 螺纹弯头1

Threaded Elbows

Description

Tapered thread engagement (NPT/NPTF) sealed with thread compound.

Features

Field-installable without welding

Reusable with sealant reapplication

Vibration-resistant designs with lock nuts

Applications

Fire sprinkler systems (NFPA 13) | Fuel gas piping (IFGC 402.4) | Temporary process lines

ASME B16.11 Threaded Elbows specification – 90° Elbows

(Units: mm | Source: ASME B16.11-2021)

NPSOD (mm)Radius TypeClass 2000
A (mm)
Class 3000
A (mm)
Class 6000
A (mm)
R (mm)Thickness (mm)
Min / Avg
1/221.9SR15.515.519.521.93.73 / 4.09
3/427.3SR19.519.5–27.33.91 / 4.27
134.0SR22.022.028.034.04.55 / 4.98
1½48.6SR32.032.0–48.65.08 / 5.56
261.3SR38.038.041.061.35.54 / 6.04
2½73.7SR44.544.5–73.77.01 / 7.67
389.1SR51.051.0–89.17.62 / 8.33
4115.8SR66.566.5–115.88.56 / 9.35
  • Thickness Scaling:
    • Class 3000LB thickness ≈ Class 2000LB
    • Class 6000LB thickness: +28% vs. Class 3000LB (e.g., NPS 1/2: Min 4.78/Avg 5.18).
  • Class 6000LB Availability: Limited to NPS ≤ 2″.

ASME B16.11 Threaded Elbows specification – 45° Elbows

(Units: mm | Source: ASME B16.11-2021)

NPSOD (mm)Radius TypeClass 2000
A (mm)
Class 3000
A (mm)
Class 6000
A (mm)
R (mm)Thickness (mm)
Min / Avg
1/221.9SR11.511.512.521.93.73 / 4.09
3/427.3SR12.512.5–27.33.91 / 4.27
134.0SR14.014.016.034.04.55 / 4.98
1½48.6SR19.019.0–48.65.08 / 5.56
261.3SR25.025.029.061.35.54 / 6.04
2½73.7SR32.032.0–73.77.01 / 7.67

Notes:

  • Class 6000LB: Only available for NPS 1/2″, 1″, and 2″.
  • A-Dimension: 45° elbows have 30-40% shorter A vs. 90° elbows.

Classified by Connection Types

According to the valve body material, it has stainless steel, carbon steel and alloy steel elbow.

Stainless Steel Elbows

Material Characteristics: Excellent corrosion resistance, hygienic properties, and oxidation resistance. Maintains mechanical properties at high/low temperatures.

SubtypeStandard & GradeKey AdvantagesApplication Directions
AusteniticASTM A403 WP304/L• 18% Cr-8% Ni composition
• Cost-effective corrosion resistance
• Easy fabrication
• Food processing pipelines (sanitary requirements)
• Architectural water features (SCH10S thin-wall)
• Weak acid chemical transport (pH 3-6)
Austenitic (Mo-Added)ASTM A403 WP316/L• 2-3% Mo addition
• Superior chloride resistance
• Non-magnetic properties
• Seawater cooling systems (power plants)
• Pharmaceutical bioreactors (electropolished)
• Coastal chemical plants
DuplexASTM A815 S31803 (2205)• 22% Cr-5% Ni-3% Mo
• 2x strength of 304SS
• Stress corrosion cracking resistance
• Subsea pipeline tie-ins
• Sour gas processing (H₂S >50ppm)
• Desalination plant high-pressure lines
Super DuplexASTM A815 S32750 (2507)• 25% Cr-7% Ni-4% Mo
• PREN ≥42
• Extreme pitting/erosion resistance
• FGD scrubber circulation loops
• Offshore topside piping
• Geothermal brine systems (high chloride)

Carbon Steel Elbows

Material Characteristics: Cost-effective, excellent weldability, and reliable mechanical strength. Limited corrosion resistance requires protective coatings.

SubtypeStandard & GradeKey AdvantagesApplication Directions
General PurposeASTM A234 WPB• Yield ≥240 MPa
• -29°C to 425°C service
• Low carbon content (0.3% max)
• Building HVAC systems (SCH40)
• Low-pressure oil pipelines (Class 150)
• Fire protection water lines
Low-TemperatureASTM A420 WPL6• Charpy impact ≥20J @ -46°C
• Fine-grain structure
• MSS SP-75 compliant
• LNG transfer arms (-162°C)
• Cryogenic storage facilities
• Arctic oil pipelines (NACE MR0175)
High-StrengthASTM A860 WPHY 60/65• Yield ≥415-450 MPa
• Fatigue resistance
• Optimized for welding
• Hydraulic fracturing manifolds
• Mining slurry transport (SCH160)
• Bridge compressed air systems

Alloy Steel Elbows

Material Characteristics: Enhanced high-temperature strength, creep resistance, and specialized chemical properties. Requires controlled welding procedures.

SubtypeStandard & GradeKey AdvantagesApplication Directions
Cr-Mo AlloyASTM A234 WP11/WP22• 1.25% Cr-0.5% Mo
• Creep resistance ≤540°C
• Hydrogen attack resistance
• Refinery catalytic reformers
• Medium-temperature steam lines (300-540°C)
• Hydrogen generation plants
High-ChromiumASTM A234 WP91• 9% Cr-1% Mo-V-Nb
• Creep resistance ≤650°C
• ASME Sec VIII compliance
• Ultra-supercritical boilers
• Nuclear reactor feedwater systems
• Biomass gasification reactors
Nickel AlloyASTM B366 N06625• 58% Ni-22% Cr-9% Mo
• Acid corrosion resistance
• Oxidation resistance @ 1100°C
• Flue gas desulfurization ducts
• Chemical reactor agitators
• Sulfuric acid concentrators

Material Selection Guide

Service ConditionRecommended MaterialCritical Standard
Seawater immersionS32750 (2507)ASTM A815
-100°C cryogenicWPL6MSS SP-75
600°C steamWP91ASME B16.25
H₂S sour gas (>50ppm)S31803 (2205)NACE MR0175
High-pressure hydrogen (90MPa)WPHY 65ASME B31.12

Design Tip: For cyclic service (e.g., pump discharge), specify seamless elbows with NDE (UT/RT) per ASME B16.9 Appendix V.

Customized Pipe Elbow Process

The following options are for you to customize. If you don’t have a design drawing, you can also consult our engineers and let us help you draw it.

size

Specified pipeline size, including pipe elbow direction angle, thickness, bolt hole diameter, bolt hole distance, etc.

Material

Using specified material suitable for pipeline engineering according to your requirements.

Shape

can be customized with pipe elbow such as Reducing Elbow.

Connection

Butt Weld Elbows, Socket Weld Elbows, Threaded Elbows, etc., which can be selected.

Special Treatment

Special treatments such as surface coatings and anti-corrosion can be made according to your needs.

The customization process for Pipe Elbow is generally as follows:

1

requirements
Confirmation

Communicate in detail to determine the requirements for pipe elbow size, material, pressure, connection method, etc.

2

Raw Material Preparation

Cut pipe to dimensions on process card using CNC cutting machines (±1mm tolerance). Remove burrs, scale, and debris from cut ends. Grind pipe ends smooth.

3

Billet Pre-Treatment

Spray internal coating lead powder graphite binder solution 0.2-0.3mm thickness dry in 120C oven for two hours

4

Hot Push Bending

Install mandrel die heat tube via medium-frequency induction to 750±10C hydraulic push at 50-80mms with 300-500t force

5

Post Forming Processing

Cool via air mist mixture control 50-80Cmin rate lathe machine ends ensure wall uniformity bevel 375±25deg

6

Quality Inspection

Check surface defects verify dimensions with calibrated gauges perform 100 percent MT and UT nondestructive testing

7

Surface Treatment

Shot blast using cast steel shot achieve SA25 cleanliness apply epoxy primer and polyurethane topcoat at specified thickness

8

Packaging Storage

Protect ends with plastic caps separate elbows with foam spacers include certificates store in dry ventilated warehouse

Customize it Now
Free Consulting

Image Gallery

Here are Pipe Elbow produced by YANHAO. You can click on the pictures to enlarge them. As a company with 25 years of Pipe Elbow production experience, YANHAO supports all types of Pipe Elbow production.

Pipe Elbow Image Gallery

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  • FAQs About Pipe Elbow

    Core Difference: Fluid turning angle, impacting system resistance, space requirements, and application suitability.

    • Angle & Function:
      • 90° Elbow: Creates a sharp 90° turn.
      • 45° Elbow: Creates a gentler 45° turn.
    • Resistance:
      • 90° Elbows cause greater flow disturbance. Their higher local resistance coefficient (~1.8 vs. ~0.3 for 45°) creates larger pressure drops in high-flow systems.
    • Applications:
      • 90° Elbow: Best for tight vertical turns (e.g., equipment ports, tight corners). Most common type.
      • 45° Elbow: Used for gradual direction changes (e.g., long pipelines), low-resistance requirements (e.g., pump suction lines), or to replace a 90° elbow (using two 45° elbows) for reduced resistance.

    The key difference is curvature radius (relative to Nominal Pipe Size, NPS), impacting space requirements and flow resistance:

    • Long Radius (LR) Elbow: Radius = 1.5×NPS. Offers smoother flow, lower local resistance, and reduced pressure drop. Use for high-pressure/high-velocity systems prone to turbulence (e.g., steam lines, high-pressure water) or where pressure loss is critical (e.g., pump discharge).
    • Short Radius (SR) Elbow: Radius = 1.0×NPS. Saves space but has higher resistance (~1.5x LR). Use only in tight spaces (e.g., equipment internals, compact pipe racks). Avoid with viscous fluids, slurries, or erosive media.

    Select materials based on corrosion type (chemical, electrochemical, erosion) and media properties (concentration, temperature, pressure). Core principle: match material corrosion resistance to the medium.

    • Mild Corrosion (e.g., fresh water, ambient air): Carbon steel (low cost, requires protective coating).
    • Moderate Corrosion (e.g., seawater, weak acids/alkalis):
      • Stainless Steel (304 for general; 316 with Mo for pitting/chlorides).
      • Duplex Steel (e.g., 2205 for stress corrosion cracking resistance in chemical brines).
    • Severe Corrosion (e.g., strong acids, hot alkalis, halogens):
      • Nickel Alloys (e.g., Inconel 600 for high-temp oxidation, nitric/acetic acid).
      • Hastelloy (e.g., C-276 for wet chlorine, hypochlorites, hydrometallurgy).
      • Non-Metallics (e.g., PVC, PP for low-concentration acids/alkalis at ambient temps; low cost but limited pressure/temperature rating).
    • Protective Measures: Surface treatments (galvanizing, epoxy coating), linings (e.g., PTFE to isolate corrosive media).

    Standards define dimensions, materials, and performance. Key standards:

    Region/SystemStandard NumberScope
    US/Int’lASME B16.9Factory-made butt-welding fittings (LR/SR elbows)
    US/Int’lASME B16.11Socket-welding & threaded fittings (small sizes)
    EuropeEN 10253-2 / -3Butt-welding / socket-welding fittings
    ChinaGB/T 12459Steel butt-welding seamless fittings (ASME B16.9 equivalent)
    Oil & GasAPI 5L / API 5CTLine pipe / casing for pipelines (pressure & sour service)

    Note: Elbow standards must match the overall piping system standard (e.g., use ASME fittings in ASME piping).

    DO NOT mix them. Wall thickness and pressure ratings differ significantly:

    • Wall Thickness & Pressure: SCH 80 has thicker walls and higher pressure ratings (~1.5x SCH 40 at same NPS/material).
    • Mixing Risks:
      • Connection Issues: Wall mismatch complicates welding preparation, increasing defect risk.
      • Pressure Rating Mismatch: System pressure is limited by the SCH 40 component, wasting SCH 80 capacity.
      • Stress Concentration: Sudden thickness change creates turbulence-induced stress, risking cracks.
    • Exception: Only if system pressure is well below SCH 40 rating, weld integrity/sealability are proven by calculation, and usage is strictly temporary & monitored.

    Standard carbon steel (e.g., A105, A234 WPB) max safe temperature is 425°C (800°F):

    • Above 425°C: Risk of blue brittleness (reduced toughness) and creep (deformation under stress).
    • Oxidation accelerates, forming scale that thins walls and weakens the elbow.
    • Solution for >425°C: Use heat-resistant alloy steel (e.g., Cr5Mo, Cr9Mo).

    Alloy steels (e.g., WP91 / ASTM A335 P91 Cr-Mo-V alloy) excel in harsh environments:

    • High Temp Performance: Operates at 600-650°C (vs. 425°C for carbon steel) with excellent creep resistance.
    • Corrosion Resistance: Chromium (9%) and Molybdenum provide oxidation and high-temp corrosion resistance (e.g., against sulfides in flue gas).
    • High Strength: Superior tensile strength and impact toughness (ambient & elevated temps), ideal for high pressure (e.g., power plant main steam, petrochemical furnace lines).
    • Summary: The durable solution for high-temp, high-pressure, and corrosive service.

    Perform multi-stage inspection:

    1. Visual & Dimensional: Check surface (no cracks, dents, porosity). Verify diameter, wall thickness, angle (e.g., 90° ±1°) with calipers/gauges.
    2. Material Verification: Use spectrometry to confirm chemical composition (ensure Cr, Ni, etc. meet spec).
    3. Non-Destructive Testing (NDT):
      • Ultrasonic (UT): Check wall thickness, detect laminations.
      • Magnetic Particle (MT) / Liquid Penetrant (PT): Detect surface cracks (esp. welds).
      • Radiographic (RT): Detect internal weld defects (porosity, lack of fusion).
    4. Pressure Test: Hydrostatic test (1.5x design pressure) or pneumatic test (1.15x design pressure); hold 30 min, no leakage.
    5. Mechanical Testing: Sample testing for tensile strength and impact toughness (e.g., ≥27J @ -40°C).

    Erosion failure results from combined mechanical wear and chemical attack:

    • Flow Erosion: High velocity (>15 m/s) or particle-laden fluids (slurries, ash) wear the inner wall, especially at the turn.
    • Cavitation: Pressure drops cause bubble formation/collapse, pitting the surface.
    • Corrosion-Accelerated Erosion: Chemical attack (e.g., strong acids, chlorides) creates pits, worsening erosion.
    • Misalignment: Off-axis installation increases turbulence and local wear.
    • Material Mismatch: Using carbon steel in seawater (chlorides) or high-velocity steam (oxidation + erosion).

    No. Threaded connections have inherent weaknesses:

    • Seal Failure: Vibration loosens threads, compromising sealant (tape/compound) and causing leaks.
    • Fatigue Cracking: Thread roots are stress concentrators; cyclic vibration leads to cracks.
    • Lower Strength: Threaded joints are weaker than welded connections.
    • Solution: Use butt-weld or socket-weld elbows for high-vibration areas (e.g., pumps, compressors). Welding provides rigidity and leak-tightness.

    About YANHAO

    Aerial view of YANHAO Factory
    Aerial view of YANHAO Factory

    YANHAO is a China Flange Manufacturer located in Hebei Province, China. It is one of the few professional Flange suppliers in China.

    We have many years of experience in flange production and have multiple flange production lines. We have sufficient stock of raw materials, rich inventory, fast delivery, and can ship within three days. At the same time, the price is affordable. You are welcome to consult and purchase!

    In addition, we can provide a variety of customized flanges and pipe fittings. Customers can give drawings or samples, and our company will produce them to fit your specific requirements.

    Learn more about YANHAO >>

    Our company was founded in 2000 and has more than 300+ employees, including 85+ middle and senior engineering and technical personnel. Our company has a number of production lines and covers an area of ​​150,000 square meters and a building area of ​​30,000 square meters.

    300+

    Number Of Workers

    85+

    Mid&Senior Engineers

    150,000

    Square Meters of Area

    25+

    Years of Experience

    • Panoramic View of The Factory
      Panoramic view of the factory
    • Elbow bending workshop
      Elbow bending workshop
    • raw material pipe storage
      raw material pipe storage
    • steel pipe storage workshop
      steel pipe storage workshop
    • Carbon steel seamless elbows pushed to the workshop
      seamless elbows pushed workshop
    • Carbon steel elbow shaping workshop
      Carbon steel elbow shaping workshop
    • Carbon steel elbow product storage workshop
      Carbon steel elbow product storage workshop
    • Finished flange waiting workshop
      Finished flange waiting workshop
    • Stainless steel pipe storage workshop
      Stainless steel pipe storage workshop
    • Stainless steel pipe fittings production workshop
      Stainless steel pipe fittings production workshop
    • Flange product storage workshop
      Flange product storage workshop
    • Butt welding pipe production process workshop
      Butt welding pipe fittings production process workshop
    • Elbow and flange product storage workshop
      Elbow and flange product storage workshop
    • Large diameter butt welding elbow bending workshop
      Large diameter butt welding elbow bending workshop
    • product waiting to be shipped packaging
      product waiting to be shipped packaging

    Our Production Line

    Our company has 8 pipe fitting production lines and 5 flange production lines. It has a full set of medium-frequency elbow hot-pushing machines, hot-die presses for reducers, cold-extrusion hydraulic presses for tees, forging hammers, vertical lathes, drilling machines, and other process-forming and mechanical processing equipment.

    Among them, the Φ1020 mm large-diameter medium-frequency hydraulic pushing machine, Φ1420 mm large-diameter medium-frequency bending machine, and Φ2438 mm 4,000-ton large hot-die press have an annual production capacity of more than 80,000 tons.

    8

    Pipe Fitting Production Lines

    5

    Flange Production Lines

    80,000 tons

    Annual Production Capacity

    • Elbow Forming Pushing Machine
      Elbow Forming Pushing Machine
    • Automatic Welding Machines
      Automatic Welding Machines
    • Hydraulic Butt Fusion Welding Machine
      Hydraulic Butt Welding Machine
    • Pipe Bending Machine
      Pipe Bending Machine
    • Cold Extrusion Tee Making Machine
      Cold Extrusion Tee Making Machine
    • Flange Lathe Machines
      Flange Lathe Machines
    • Heat treatment furnace
      Heat treatment furnace
    • Pipe Cleaning Shot Blasting Machine
      Pipe Cleaning Shot Blasting Machine
    Production equipment list

    Quality Testing & Certificates

    Our company is also equipped with a full set of physical and chemical testing, including spectrometer direct reading, non-destructive testing, heat treatment, water pressure testing, and other product quality testing equipment, providing a reliable guarantee for the production of high-quality products.

    • Metallographic Analyzer
      Metallographic Analyzer
    • Tensile Testing Machine
      Tensile Testing Machine
    • Thickness measurement
      Thickness measurement
    • Magnetic particle inspection
      Magnetic particle inspection
    • Hardness testing
      Hardness testing
    • Physical and chemical testing
      Physical and chemical testing
    • Impact test
      Impact test
    • Ultrasonic testing
      Ultrasonic testing
    • Low temperature testing
      Low temperature testing
    • Direct-Reading Spectrometer
      Direct-Reading Spectrometer
    Testing equipment list

    Check Our Certificates

  • Certificate for Material Manufacturer: ISO 14001:2015
    Certificate for Material Manufacturer: ISO 14001:2015
  • Certificate for Material Manufacturer: ISO 14001:2015
    Certificate for Material Manufacturer: ISO 14001:2015
  • Certificate for Material Manufacturer: ISO 14001:2015
    Certificate for Material Manufacturer: ISO 14001:2015
  • GB/T 19001-2016/ISO 9001:2015
    CQM: GB/T 19001-2016/ISO 9001:2015
  • GB/T 45001-2020/ISO 45001:2018
    CQM: GB/T 45001-2020/ISO 45001:2018
  • GB/T 24001-2016/SO 14001:2015
    CQM: GB/T 24001-2016/SO 14001:2015
  • Q/SHS 0001.1-2001 Q/SY 1002.1-2013
    CQM: Q/SHS 0001.1-2001 Q/SY 1002.1-2013
  • FAQs

    Yes, we are a flange pipe fittings manufacturer located in Cangzhou, Hebei, China. Founded in 2000, we cover an area of ​​150,000 square meters, with a building area of ​​30,000 square meters. We currently have more than 300 employees and are a relatively large and powerful Chinese flange manufacturer.

    The company has 8 pipe fittings production lines and 5 flange production lines. It has a full set of medium-frequency elbow hot push machines, reducer hot mold presses, tee cold extrusion hydraulic presses, forging hammers, vertical lathes, drilling machines and other processing and machining equipment. Among them, the φ1020 mm large-diameter medium-frequency hydraulic push machine, φ1420 mm large-diameter medium-frequency bending machine, and φ2438 mm 4,000-ton large-scale hot mold press have an annual production capacity of more than 80,000 tons.

    For standard models, our factory has a large inventory, and the delivery time is usually only a few days. For non-standard parts, we also have a large reserve of raw materials and multiple production lines, which will save one-third of the time compared to other manufacturers and ship them to you as soon as possible.

    We have our own testing system. Each batch of goods will have a corresponding product certificate and quality inspection report. At the same time, we have ISO9001 product quality certification, classification society certificate, ASNE quality certificate and other international authoritative quality certification certificates. We will never ship out unqualified products. In addition, we support customers to entrust third-party inspection companies for inspection and acceptance.

    Of course, you can provide us with drawings or samples for customization, or you can ask us to design and customize your exclusive flange pipe fittings for you. Learn More>>

    Our products are used in oil, gas, chemical industry, machinery, shipbuilding, aerospace, electricity, pharmaceuticals, construction engineering, water conservancy engineering, and marine engineering. Don’t worry about some special fields with high requirements. We have strong production capacity and rich production experience and can provide you with professional solutions. You can send us your working conditions and we can give you a solution for free.

    Our company can provide you with samples for free, you can contact sales to request samples.

    Of course, you are very welcome to visit our factory. We will also arrange meals and accommodation for you. If you have enough time, we can also take you to visit China’s famous mountains and historical sites, so that you can better understand China and our culture. It will be worthwhile and we look forward to seeing you.

    202404223 1

    Middle Eastern customers visit Yanhao pipe fittings factory

    A company in the Middle East that specializes in providing services for petroleum sent a representative to our Chinese flange factory in April 2024. After a long inspection, the customer…
    Read More Middle Eastern customers visit Yanhao pipe fittings factory

    We are the source manufacturer. If you have the strength, you will get more favorable prices, faster delivery and more guarantees if you purchase directly from us. We will have professional sales staff to track customers’ orders throughout the process, update the order status in real time, and let customers know their order progress and product quality in real time.

    We support payments in over 40 currencies worldwide.

    We have a long-term logistics transportation company that supports sea, land and air transportation to ensure that customers receive the goods on time. At the same time, if customers have a cooperative logistics company, we will still fully cooperate with your logistics company to ensure that customers can receive the goods as soon as possible.

    Having Questions? Contact Now!

    • Tel: +86-133-1307-3735
    • Email Us: sales@yanhaocn.com
    • Whatsapp:  +86 13313073735

    As a leading Chinese flange manufacturer, we are committed to delivering superior-quality pipe flanges at competitive prices.

    Our extensive experience and cutting-edge production technology ensure that our products meet the highest industry standards.

    We pride ourselves on our ability to provide tailored solutions to meet the diverse needs of our clients, ensuring that our flanges are perfectly suited for a wide range of applications.

    Trust us to be your reliable partner for all your flange requirements.

    Service

    • Custom Flanges

    Flange Types

    • Weld Neck Flanges
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    • Blind Flanges

    Flange Materials

    • Stainless Steel Flanges
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    • Alloy Steel Flanges

    Flange Standards

    • B16.47 Flanges
    • B16.5 Flanges
    • EN Standard Flange

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