What Are the Chemical Components of 304 Stainless Steel?

Abstract: What is the chemical composition of 304 stainless steel? The composition requirements of 304 stainless steel in various national standards are different.

See the chemical composition table of national standard 304 stainless steel for the elements contained in stainless steel 304.

304 stainless steel is mainly composed of F iron, followed by Cr Cr and Ni.

What Are the Chemical Components of 304 Stainless Steel? 1

The chemical composition of 304 stainless steel is mainly Fe (about 67-71.5%), Cr (about 17.5-19.5%) and Ni (about 8-10.5%).

304 stainless steel is the American standard stainless steel grade, the corresponding Japanese standard stainless steel grade is SUS304, and the corresponding Chinese standard stainless steel grade is 06Cr19Ni10.

Different countries have slightly different requirements for the composition of 304 stainless steel.

For example, according to our national standard GBT24511-2017, the chemical composition ratio of 06Cr19Ni10 stainless steel with chromium (Cr) should be between 18.00% and 20.00%.

The American ASTM A240 standard requires 17.519.5%.

American standard element content of 304 stainless steel: stainless steel 304 material standard, what elements are contained in stainless steel 304, see 304 stainless steel composition content comparison table:

Related reading: Stainless Steel Grades: The Ultimate Guide

Composition Comparison Table of National Standard 304 Stainless Steel (by element content ratio)

Standard name  UNS No.Brand CMn PSSiCrNiN
American standard ASTM A240M-15aS304003040.0720.0450.030.7517.5-19.58-10.5 –
Old national standard GB24511-2009S3040806Cr19Ni100.0820.0350.020.7518-208-10.50.1
New national standard GB/T24511-2017S3040806Cr19Ni100.0820.0350.0150.7518-208-10.50.1
Japanese standard JISG4305:2005 –SUS3040.0820.0450.03118-208-10.5 –
European Standard EN10028-7:2007 –1.43010.0720.0450.015117.5-19.58-10.50.1

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

The Chinese brand (model) similar to 304 stainless steel is 06Cr19Ni10.

For the chemical composition requirements of national standard 06Cr19Ni10 stainless steel, please refer to the above American Standard, Old National Standard and New National Standard 304 Chemical Composition Table for comparison.

The chemical composition of 304 stainless steel (chemical element content of 304 material) has little difference between national standards.

When the technical documents require that American standard, national standard or Japanese standard materials must be used, materials conforming to corresponding standards (304, 06C19Ni10 or SUS304) shall be used.

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