Carbon Steel Flanges

Our company provides Carbon Steel Flanges.

The carbon steel flange is a flange made of carbon steel material, common materials are ASTM A694, ASTM A105N (SA105N), MSS SP-44, DIN 2533, etc., common standards are ANSI/ASME B16.5, EN 1092-1, ISO 7005-1, etc. international standards, which is popular due to its affordable price and wide application.

flange standard

lewis Liu

sales Manager

Carbon Steel Flanges

Carbon steel flanges are mainly made of carbon steel materials, common materials are ASTM A694, ASTM A105N (SA105N), MSS SP-44, DIN 2533, etc., and their carbon content is between 0.25-0.60%, containing a large amount of carbon and manganese, so the melting point of the carbon steel material is low, ductility is good, which makes it more convenient to use the processing and manufacturing, and it has certain Room corrosion, smooth surface, good durability, and relatively cheap stainless steel flange, is widely used in a variety of industrial pipelines.

Here is the detailed feature and performance table for carbon steel flanges:

Typeweld neck flanges, slip-on flanges, blind flanges, lap joint flanges, socket weld flanges, threaded flanges.
MaterialASTM A105,20#、Q235、16Mn、
ASTM A350 LF1,LF2 CL1/CL2,LF3 CL1/CL2、
ASTM A694 F42,F46,F48,F50,F52,F56,F60,F65,F70
Sizes1/2″ – 60″
flange faceRaised face (RF), concave face (FM), convex face (M), tongue and groove (T), groove (G), full face (FF), ring joint (RJ)
Common StandardsANSI/ASME B16.5, ANSI/ASME B16.47, EN 1092-1, JIS B2220
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.
Production equipmentUnloading machines, forging hammers, presses, flange molds, heat treatment furnaces, machining lathes, high-speed drilling machines, marking and typing machines, etc.
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.
Rust preventionElectro zinc plating (white or yellow zinc), antirust paint, oil varnish
ApplicationMostly used in high pressure, high temperature, low temperature or strong corrosive industrial pipeline, such as petroleum, chemical, corrosive gases and liquids transportation and other places.

This comprehensive table provides detailed information about the features, performance, common material grades, specification sizes, standards, types, flange faces and connection methods, and the manufacturing process of carbon steel flanges. It will help you gain a comprehensive understanding of carbon steel flanges’ characteristics, enabling you to make informed decisions regarding material and specification choices to meet specific engineering requirements. Please note that selecting the right specifications, sizes, and flange types is critical to ensuring the effectiveness and reliability of flanges in a system.


  1. varnish: brushing a layer of varnish on top of the carbon steel flange can form a protective layer, effectively preventing contact with corrosive substances minus rust.
  2. Anti-rust paint: this is the same principle as varnish, anti-rust paint is more effective, it helps to prevent moisture from entering the metal, effectively preventing rust and corrosion.
  3. Zinc plating (yellow or white zinc): a layer of zinc coating on the flange, effectively preventing corrosive substances and moisture contact with the flange, to achieve the effect of rust prevention.

It is a metallic material with a carbon content between 0.25 and 0.60%, commonly known by the material numbers ASTM A694, ASTM A105N (SA105N), MSS SP-44, and DIN 2533.

Carbon steel flanges and other materials flanges, such as stainless steel flanges and alloy steel flanges, the difference is that the corrosion resistance is slightly worse, but the price is cheap, for the requirements are not high in the general pipeline, carbon steel flanges can be completely.

Carbon steel flanges have a smooth surface, corrosion resistance, good ductility, easier processing, and at the same time cheaper, so they are widely used, mostly in low-pressure occasions.

If the corrosiveness is not very strong, to carbon steel flange paint or galvanized coating can also be used, but must pay attention to regular inspection and maintenance to protect the normal operation of the pipeline.