Os componentes químicos do aço inoxidável 304: explicados

The Chemical Components of 304 Stainless Steel: Explained

Summary: The chemical composition of 304 stainless steel may vary according to different national standards.

The table below shows the chemical composition of 304 stainless steel according to national standards.

304 stainless steel consists primarily of iron (Fe), followed by chromium (Cr) and nickel (Ni).

The chemical composition of 304 stainless steel mainly consists of iron (Fe) at 67-71.5%, chromium (Cr) at 17.5-19.5% and nickel (Ni) at 8-10.5%.

304 stainless steel is recognized as the American standard stainless steel grade and is referred to as SUS304 in Japan and 06Cr19Ni10 in China.

Each country has slightly different composition requirements for 304 stainless steel. For example, according to the national standard GBT24511-2017 in China, the chromium (Cr) content in 06Cr19Ni10 stainless steel should be between 18.00% and 20, 00%.

The American standard ASTM A240 requires a chromium content of 17.5-19.5%.

To understand the elements contained in 304 stainless steel, refer to the 304 stainless steel composition comparison table.

Related Reading: Stainless Steel Grades: The Ultimate Guide

Composition comparison table of national standard 304 stainless steel (by element content ratio)

Default name SOME No. Brand C Mn P s Yes Cr No N
American standard ASTM A240M-15a S30400 304 0.07 two 0.045 0.03 0.75 17.5-19.5 8-10.5
Former national standard GB24511-2009 S30408 06Cr19Ni10 0.08 two 0.035 0.02 0.75 18-20 8-10.5 0.1
New national standard GB/T24511-2017 S30408 06Cr19Ni10 0.08 two 0.035 0.015 0.75 18-20 8-10.5 0.1
Japanese standard JISG4305:2005 SUS304 0.08 two 0.045 0.03 1 18-20 8-10.5
European Standard EN10028-7:2007 1.4301 0.07 two 0.045 0.015 1 17.5-19.5 8-10.5 0.1

304 stainless steel is widely used and is one of the common types of austenitic stainless steel.

In China, the equivalent grade of 304 stainless steel is 06Cr19Ni10.

For the composition requirements of the national standard stainless steel 06Cr19Ni10, please refer to the comparison table of the American standard, the old national standard and the new national standard 304 chemical composition.

The chemical composition of 304 stainless steel presents minimal differences between national standards.

When technical specifications require the use of American standard, national standard or Japanese standard materials, it is necessary to use materials that comply with the corresponding standards (304, 06Cr19Ni10 or SUS304).

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