Decodificando a composição do material de aço inoxidável padrão americano

Decoding the material composition of American standard stainless steel

There are many ways to write stainless steel material codes (grades), including 304, 304L, 316L, etc. refer to American standard stainless steel grades.

For common American Standard stainless steel material composition standards, see ASTM A240/A240M-15a Standard Specification for Chromium and Nickel-Chromium Stainless Steel Plates, Sheets, and Strips for Pressure Vessels and General Applications

(Notes) ASTM A240/A240M-15a is consistent with ASTM A240/A240M-18 for the composition of stainless steel materials listed in this document.

The composition specifications of stainless steels 304, 304L, 316L, 321 and 301, 309S, 310S, 2205 and 2507 are listed below:

American Standard Stainless Steel Material Composition Table

SOME No Note W Mn P s Yes Cr No N Mo You
S30400 304 0.07 two 0.045 0.03 0.75 17.5-19.5 8.0-10.5 0.10
S30403 304L 0.03 two 0.045 0.03 0.75 17.5-19.5 8.0-12.0 0.10
S31603 316L 0.03 two 0.045 0.03 0.75 16.0-18.0 10.0-14.0 0.10 2-3
S32100 321 0.08 two 0.045 0.03 0.75 17.0-19.0 9.0-12.0 0.10 0.63-0.9

Observation:

  • 1. The unit is percentage, that is, “%”;
  • 2. Except for the indicated range, the components listed in the table are the maximum values.

American Standard Stainless Steel Material Composition Table
Source: ASTM A240/A240M-15a

SOME No Note W Mn P s Yes Cr No N Mo You
S30100 301 0.15 two 0.045 0.03 1 16.0-18.0 6.0-8.0 0.10
S30908 309S 0.08 two 0.045 0.03 0.75 22.0-24.0 12.0-15.0
S31008 310S 0.08 two 0.045 0.03 1.5 24.0-26.0 19.0-22.0
S32205 2205 0.03 two 0.03 0.02 1 22.0-23.0 4.5-6.5 0.14-0.2 3-3.5
S32750 2507 0.03 1.2 0.035 0.02 0.8 24.0-26.0 6.0-8.0 0.24-0.32 3-5

Observation:

  • 1. The unit is percentage, that is, “%”;
  • 2. Except for the indicated range, the components listed in the table are the maximum values.

It can be seen from the table above that the chemical element content of the American standard 304 is similar to that of the national standard 06Cr19Ni10 (unified numerical code: S30408) and the Japanese standard SUS304;

The chemical composition of American standard 316L stainless steel is similar to that of the national standard 022Cr17Ni12Mo2 (unified numerical code: S31.603) and the Japanese standard SUS316L.

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