1. Different requirements
The national standard of stainless steel is manufactured according to the unified industry standards and specifications promulgated by the state; Non-standard products or equipment are not manufactured in accordance with the unified industry standards and specifications promulgated by the state.
2. Different product characteristics
Different uses of stainless steel products have different requirements for welding performance. A kind of tableware generally does not require welding performance, even including some pot enterprises. However, most products need good welding performance of raw materials, such as second-class tableware, thermos cups, steel pipes, water heaters, water dispensers and so on.
stainless steel non-standard products are products or equipment designed and manufactured by themselves according to their own needs. And the appearance or performance is not in the national equipment product catalogue.
Extended information:
International stainless steel labeling method
American Iron and Steel Institute uses three digits to label various standard grades of malleable stainless steel. Among them:
① Austenitic stainless steels are marked with numbers of 2 and 3 series. For example, some common austenitic stainless steels are marked with numbers of 21, 34, 316 and 31.
② ferritic and martensitic stainless steels are represented by 4 series numbers.
③ ferritic stainless steel is marked with 43 and 446, and martensitic stainless steel is marked with 41, 42 and 44C.
④ dual phase (austenite-ferrite), stainless steel, precipitation hardening stainless steel and high alloy with iron content less than 5% are usually named by patent names or trademarks.
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