1, carbon (C) content marks
1) old name: 1000 when the number before Cr shows carbon content. Be like 201 (1Cr17Mn6Ni5N) : Carbon (C) content one thousandth; 2Cr13 (420) , 7Cr17(440A) , express carbon respectively (C) content 2 millesimals with 7 millesimals; If C ≤ 0.08% for low carbon, the label is " 0 " , be like (304) 0Cr18Ni9; C ≤ 0.03% to exceed low carbon, the label is " 00 " , be like 00Cr17Ni14Mo2 (316L) .
2) new name: The number before Cr shows carbon (C) extremely content. If 201 brands are 12Cr17Mn6Ni5N, express carbon (C) content extremely (0.12% ) ; 304 brands are 06Cr19Ni10, express carbon (C) content extremely (0.06% ) ; 316L brand is 022Cr17Ni12Mo2, express carbon (C) content extremely (0.022% ) . Other label is basic and changeless.
The carbon in new name (C) content than more clear before, to the product manufacturing technology also had higher demand.
2, content of individual ability qualitative raw material happens adjust
Raw material content produces fluctuant partial steel to plant quite:
Japan of NO China standard (JIS) American new standard is old standard ASTM UNS 1 06Cr19Ni10 0Cr18Ni9 SUS304 304 S30400 2 022Cr17Ni12Mo2 00Cr17Ni14Mo2 SUS316L 316L S31603 3 019Cr19Mo2NbTi 00Cr18Mo2 SUS444 444 S444
321 of S32100 5 06Cr19Ni10N 0Cr19Ni9N SUS304N1 304N S30451 304 in the content of Cr and Ni rose respectively 1 dot; The content of the Ni in 316L rises 2 dot; 444 in Cr content rose 1 dot Joined Nb, Ti microelement; 321 in Ni content reduced 1 point; Content of the Ni in 304N1 reduced 1 point. Each steel is planted between the adjustment that made different pitch, nickel adjusts extent scale in abstruse type style bigger.