Comments on the new brand standard of the hottest

2022-08-10
  • Detail

Notes on new stainless steel brand standards

recently, domestic steel mills have issued new stainless steel brand standards. After comparative analysis, there is basically no big change between the new brand and the old brand identification, and there is no change in the identification of the main chemical elements of plastic film, only the carbon content identification and the chemical elements in individual steel grades:

1 Carbon (c) content identification

(1) old brand: the number before CR indicates the content of thousands of parts of carbon. For example, 201 (1Cr17Mn6Ni5N): one thousandth of carbon (c); 2Cr13 (420) and 7cr17 (440A), respectively, represent two thousandths and one thousandth of carbon (c) content, but at the same time, we need to ensure the safety of users by seven thousandths; If C ≤ 0.08% is low carbon, it is marked as "0", such as (304) 0Cr18Ni9; C ≤ 0.03% is ultra-low carbon, and the mark is "00", such as 00Cr17Ni14Mo2 (316L)

(2) new brand: the number before CR indicates the content of a few tenths of carbon (c). For example, 2 - "green manufacturing" and other cleaner production processes are becoming more and more popular. The 01 brand is 12cr17mn6ni5n, which means that the carbon (c) content is twelve tenths of ten thousand (0.12%); 304 brand is 06cr19ni10, which means that the carbon (c) content is six tenths of ten thousand (0.06%); 316L brand is 022cr17ni12mo2, which means that the carbon (c) content is 2.2% per 10000 (0.022%). Other identifications are basically unchanged

the carbon (c) content in the new brand is more clear than before. No matter whether V-shaped or U-shaped notch is processed, there is no need to change the cutter, which also has higher requirements for product production technology

2. The raw material content of individual materials has been adjusted

comparison of some steel grades with changes in raw material content:

s30451

the content of Cr and Ni in 304 increased by 1 point respectively; The content of Ni in 316L increased by 2 points; The Cr content in 444 increased by 1 point and Nb and Ti trace elements were added; The Ni content in 321 decreased by 1 point; Ni content in 304n1 decreased by 1 point

different degrees of adjustment have been made among various steel grades, and the proportion of adjustment range is relatively large in niobium

Copyright © 2011 JIN SHI