Stainless Steel Pipe Fittings

How to mark large stainless steel flange By

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Corrosion resistance of stainless steel with the increase of carbon content and reduce, therefore, the majority of stainless steel carbon content are lower, the maximum not more than 1.2%, some steel Wc (carbon content) and even less than 0.03% (such as 00Cr12). The main alloying element in stainless steel is Cr (CR), only when the Cr content reaches a certain value, the steel has the corrosion resistance. Therefore, the stainless steel general Cr (CR) content of at least 10.5%. Stainless steel also contains Ti, Mn, Ni, N, Nb, Mo, Si, Cu and other elements.
Stainless steel is often divided into: martensitic steel, ferritic steel, austenitic steel, AUSTENITIC FERRITIC (duplex) stainless steel and precipitation hardening stainless steel. In addition, can be divided into: chromium stainless steel, chromium nickel stainless steel and chromium manganese nitrogen stainless steel, etc..
Large stainless steel flange common marking method, the American Iron and Steel Institute is to use three digits to label a variety of standard grade of stainless steel. Among them:
Large stainless steel flange with 200 and 300 series digital mark,
400 series of digital representation for ferrite and martensite stainless steel. For example, some of the more common austenitic stainless steels are marked with 310, 304, 316, and 201,
The ferrite stainless steel is marked with 430 and 446, and the martensitic stainless steel is marked with 410, 420, and 440C, and the dual phase (austenite ferrite) is a double phase,

High alloy stainless steel, the precipitation hardening stainless steel and iron is less than 50% is usually used patent name or trademark naming.

Source: Zhejiang Yaang Pipe Industry Co., Limited (

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