Chemical composition%
C:≤0.07，
Si :≤ 1.0，
Mn :≤2.0，
Cr : 17.0~ 19.0，
Ni :8.0~ 1 1.0，
S :≤0.03，
P :≤0.035。
intensity
Tensile strength (MPa) 620 minutes.
Yield strength (MPa) 310min
Elongation (%) 30 minutes
Area reduction (%) for 40 minutes
The density of 304 stainless steel is 7.93g/cm3.
Chromium content (%) 18-20. Old brand standard: gt/t4327-19920cr18ni9.
New brand standard: gt/t3280-200706cr19ni10.
American standard brand standard: ASTM A240/A240M 304
The American Iron and Steel Association uses three numbers to represent various standard grades of malleable stainless steel. These include:
① Austenitic stainless steel is marked with 200 and 300 series numbers,
② Ferritic and martensitic stainless steels are represented by 400 series numbers. For example, some common austenitic stainless steels are marked with 20 1, 304, 3 16, 3 10.
③ Ferritic stainless steels are labeled 430 and 446, and martensitic stainless steels are labeled 4 10, 420 and 440C, which are dual-phase (austenite-ferrite).
④ Stainless steel, precipitation hardening stainless steel and high alloy with iron content less than 50% are usually named by patent names or trademarks.
Classification and grading of standards
4- 1 classification: ① national standard GB ② industry standard YB ③ local standard ④ enterprise standard Q/CB.
4-2 Classification: ① Product standard ② Packaging standard ③ Method standard ④ Basic standard.
4-3 standard level (divided into three levels): Y level: international advanced level I level: international general level H level: domestic advanced level.
4-4 GB 1220-84 stainless steel bar (grade 1) GB424 1-84 stainless steel welding plate (grade h) GB4356-84 stainless steel welding plate (grade 1) GB 1270-80 stainless steel pipe (grade 1) GB65438+.
20 1，202，30 1，302 7.93 3 16，3 16L，347
309S，3 10S 7.98 405，4 10，420 7.75 409，430，434 7.7