Identification method of stainless steel pipe

Representation method
(1) Use international chemical element symbols and national symbols to indicate chemical composition, and Arabic letters to indicate component content:
Such as: China, Russia 12CrNi3A
(2) Use fixed digits to represent steel series or numbers; Such as: the United States, Japan, 300 series, 400 series, 200 series;
(3) Serial numbers are composed in Latin letters and order, indicating only use.

Number sequence
(1) Adopt element symbols;
(2) Hanyu Pinyin, Pingfang Steel: P; Boiling steel: F; Calming steel: B; Class A steel: A; T8: Special 8; GCr15: Balls.
◆Bonded steel, spring steel, such as: 20CrMnTi 60SiMn, (C content expressed in parts per 10,000).
◆ Stainless steel, alloy tool steel (C content expressed in parts per thousand), such as: 1Cr18Ni9 1/1,000 (ie 0.1% C), stainless C≤ 0.08% such as 0Cr18Ni9, ultra-low carbon C≤0.03% such as 0Cr17Ni13Mo.

Labeling method
The American Iron and Steel Institute uses three-digit numbers to identify various standard grades of malleable stainless steel. Thereinto:
(1) Austenitic stainless steels are marked with numbers of 200 and 300 series, for example, some more common austenitic stainless steels are marked with 201, 304, 316 and 310.
(2) Ferritic and martensitic stainless steels are represented by the numbers of the 400 series. Ferritic stainless steels are marked 430 and 446, martensitic stainless steels are marked 410, 420 and 440C, duplex (austenitic-ferritic).
(3) Stainless steel, precipitation hardening stainless steel and high alloys with iron content less than 50% are usually named by patent or trademark.