Alloy Steel Flanges

Our company provides Alloy Steel Flanges.

We are a China flange manufacturing factory, that can provide you with all kinds of standard alloy steel flanges with nominal diameters from ½ inch to 60 inches, and the products are tested to meet the quality standards, which can meet your different project requirements.


lewis Liu

sales Manager

Alloy Steel Flanges

The Alloy steel flange is a kind of flange made of alloy steel material containing alloy elements such as chromium, molybdenum, nickel, etc. This kind of flange usually has the properties of high-temperature resistance, corrosion resistance, oxidation resistance, etc., which can be used in high-temperature, high pressure and corrosive pipelines.

Typeweld neck flanges, slip-on flanges, blind flanges, lap joint flanges, socket weld flanges, threaded flanges.
MaterialASTM A182 F11、ASTM A217 WC6、ASTM A335 P11
ASTM A182 F22、ASTM A217 WC9、ASTM A335 P22
ASTM A182 F5、ASTM A217 C5、ASTM A335 P5
ASTM A182 F9、ASTM A217 C12、ASTM A335 P9
Sizes1/2″ – 60″
Common StandardsANSI/ASME B16.5, ANSI/ASME B16.47, EN 1092-1, JIS B2220
flange faceRaised face (RF), concave face (FM), convex face (M), tongue and groove (T), groove (G), full face (FF), ring joint (RJ)
Production processForging, heat treatment and machining
Ingot billets and round bars – Chemical element analysis – Band saw cutting – Forging – Heat treatment – Inspection – Stocking of blanks – Lathes -Deep hole drilling -Inspection – -Marking -Packing in plywood.
Product TestingDirect Reading Spectrometer, Hydrostatic Pressure Tester, X-ray Flaw Detector, UI Ultrasonic Flaw Detector, Magnetic Particle Flaw Detector
Each product has its own quality certificate and can also be tested by a third party.
Production equipmentUnloading machines, forging hammers, presses, flange molds, heat treatment furnaces, machining lathes, high-speed drilling machines, marking and typing machines, etc.
Rust preventionElectro zinc plating (white or yellow zinc), antirust paint, oil varnish
ApplicationAlloy steel flanges are usually high temperature, corrosion and oxidation resistant and can be used in high temperature, high pressure and corrosive pipelines.

In the above table, we provide general information about alloy steel flanges, such as performance characteristics, common materials, specifications and dimensions, which we hope will help you to understand the alloy steel flanges.

The following are some common pressure ratings and temperature ranges for alloy steel flanges.

ASME B16.5 standard (American Standard):

● Pressure ratings: 150LB, 300LB, 600LB, 900LB, 1500LB, 2500LB, etc.

● Temperature range: -29℃ to 815℃.

DIN standard (German standard):

● Pressure ratings: PN6, PN10, PN16, PN25, PN40, etc.

● Temperature range: -20℃ to 450℃.

JIS standard (Japanese standard):

● Pressure ratings: 5K, 10K, 16K, 20K, 30K, etc.

● Temperature range: -10℃ to 350℃.

Warm tips: It is recommended that when choosing alloy steel flanges, we should refer to the relevant standards and specifications, and communicate with professional technicians in order to choose the flanges that are more suitable for the project.

Alloy steel flanges are flanges made of an alloy steel material containing alloy elements such as chromium, molybdenum and nickel.

Alloy steel flanges are widely used in piping systems of electric power, petrochemical, paper making, metallurgy, pharmaceutical, and other industries.

The manufacturing process of alloy steel flanges includes forging, casting, hot extrusion, cold working, and so on.

The price of alloy steel flange is affected by steel price, manufacturing process, specification size, factory cost, labor wage, and other factors, generally more expensive than carbon steel flange, but cheaper than stainless steel flange.

The sealing forms of alloy steel flanges include plane sealing, concave-convex sealing, tongue and groove sealing, etc. 10.

Alloy steel flanges have high-pressure resistance, corrosion resistance, abrasion resistance, and high-temperature resistance, the price is cheaper than stainless steel flanges, and cost-effective.

The selection of alloy steel flanges needs to consider the internal and external diameter size of the pipeline, medium corrosivity, pipeline pressure, fluid temperature, project budget, and other factors, and refer to the flange standards and specifications.

When installing alloy steel flanges, it is necessary to pay attention to the surrounding environment to be clean, the flange sealing surface is flat, as well as the tightness of the bolts to ensure that the pipeline will not leak.
During maintenance, regular inspection is required to ensure that the pipeline is not damaged, no corrosion of the skin, and the bolts are tightened to ensure good sealing and no leakage.

The common standards for alloy steel flanges are ASME B16.5, DIN, ANSI, JIS, etc. 9.

To ensure the quality of alloy steel flanges, we need to start with the choice of materials, manufacturing process, testing methods, etc., choose regular manufacturers and suppliers, and carry out strict quality inspection.