What Is the Chromium Content of Stainless Steel 304?

1. What is the chromium content of stainless steel 304?

In 304 stainless steel, the content of chromium Cr is generally between 17.5-20%.

There are slight differences in the regulations of various countries on the chromium content standard of 304 stainless steel.

For example, the chromium content of stainless steel SUS304 is required to be 18-20% (according to the Japanese standard 1S G4305-2015), and the chromium content of stainless steel 304 is required to be 17.5-19.5% (according to the American standard ASTM A240/A240M-15a).

Chromium (Cr) is an essential component of stainless steel.

What Is the Chromium Content of Stainless Steel 304? 1

The content of chromium in stainless steel 304 directly affects the corrosion resistance of stainless steel materials.

Chromium (Cr) is one of the basic elements to maintain the corrosion resistance of stainless steel.

The combination of chromium and oxygen can form a corrosion-resistant passive film.

 If the stainless steel surface is scratched, the passive film will be formed again to maintain the corrosion resistance and rust resistance of stainless steel.

2. 304 stainless steel chromium content standard

Comparison table of chromium content of common stainless steel materials:

Chromium content of 304 and common stainless steel materials

Material Elements304①S30408②
06Cr19Ni10
3304L③S30403④
022Cr19Ni10
316L⑤6S31603⑥
022Cr17Ni12Mo2
Cr17.5-19.518-2017.5-19.518-2016-1816-18

Remarks:

1. Unit:%;

2. ①, ③ and ⑤ data source: American standard ASTM A240/A240M-15a;

3. ②, ④, ⑥ Data source: GB/T20878-2007;

Related issues

Is the content of chromium and nickel in stainless steel as high as possible?

The content of chromium and nickel in stainless steel is not the greater the better, but should conform to the corresponding standards.

Different stainless steels have different requirements for chromium and nickel content.

As shown in the above table, the content of 304 stainless steel bars shall be between 17.5% and 19.5%.

According to the American standard ASTM A240M-15a, the nickel content of 304 stainless steel is required to be between 8% and 10.5%.

Referring to the regulations on stainless steel materials in various countries, take the common 304 stainless steel as an example.

The chromium content of 304 stainless steel is basically between 17.5% and 20%,

The nickel content of 304 stainless steel is basically between 8% and 10.5%.

Combined with the role of alloy elements in stainless steel, it can be concluded that within the content range specified in the corresponding material standard, the greater the chromium nickel content in stainless steel, the better.

How much more chromium is called stainless steel?

Definition of stainless steel: steel with stainless steel and corrosion resistance as its main characteristics, chromium content of at least 10.5% and carbon content of at most 1.2%.

The amount of chromium in stainless steel directly affects the corrosion resistance of stainless steel.

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