1. Representation:
① Use international chemical element symbols and national symbols to indicate chemical components, and use Arabic letters to indicate component content:
Such as: China, Russia 12crni3a
② Use a fixed number to indicate the steel number or steel number; for example: the United States, Japan, 300 series, 400 series, 200 series;
③Ordinal numbers and sequences in the Latin alphabet, only for purposes.
2. Numbering rules:
① Use meta symbols;
②Hanyu Pinyin, open hearth steel: P; boiling steel: F; killed steel: B; A-grade steel: A; t8: special 8; gcr15: ball.
Connection steel, spring steel, such as: 20CrMnTi 60SiMn, (with a few words to indicate the C content).
Stainless steel, alloy tool steel (with several points to indicate C content), such as: 1Cr18Ni9 1‰ (ie 0.1%c), rust C≤0.08% such as 0cr18ni9, ultra-low carbon c≤0.03% such as 0cr17ni13mo.
3. Marking method:
The American Iron and Steel Institute uses three digits to designate various standard grades of wrought stainless steel.
which one
①Austenitic stainless steels are marked with 200 and 300 series, for example, some of the more common austenitic stainless steels are marked with 201, 304, 316 and 310.
② Ferritic and martensitic stainless steels are represented by 400 series numbers.
Ferritic stainless steels are marked 430 and 446, martensitic stainless steels are marked 410, 420 and 440C, duplex (austenitic-ferritic).
③Stainless steel, precipitation hardening stainless steel and high alloys with less than 50% iron content are usually named by patent names or trademarks.
