Chromium Content in Stainless Steel 304: Cracking the Code

1. What is the chromium content of stainless steel 304? The chromium (Cr) content in 304 stainless steel typically ranges from 17.5% to 20%. There are slight variations in the chromium content standards for 304 stainless steel among different countries. For instance, according to Japanese standard 1S G4305-2015, the chromium content in SUS304 stainless steel […]

Table Of Contents

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

The chromium (Cr) content in 304 stainless steel typically ranges from 17.5% to 20%.

There are slight variations in the chromium content standards for 304 stainless steel among different countries. For instance, according to Japanese standard 1S G4305-2015, the chromium content in SUS304 stainless steel must be between 18% and 20%, while the American standard ASTM A240/A240M-15a requires the chromium content in 304 stainless steel to be between 17.5% and 19.5%.

It’s worth noting that chromium is a critical component in the composition of stainless steel.

The chromium content in stainless steel 304 plays a crucial role in determining its corrosion resistance.

Chromium (Cr) is a key component in maintaining the anti-corrosive properties of stainless steel.

The presence of chromium and oxygen creates a passive film that protects against corrosion.

Even if the surface of stainless steel is scratched, the passive film will reform, preserving its resistance to corrosion and rust.

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 always proportional to quality, but should adhere to the relevant standards.

Different types of stainless steel have varying requirements for chromium and nickel content. For example, according to the table, 304 stainless steel bars should have a chromium content between 17.5% and 19.5%.

In accordance with the American standard ASTM A240M-15a, the nickel content in 304 stainless steel should fall between 8% and 10.5%.

Taking the commonly used 304 stainless steel as an example, the regulations on stainless steel materials vary across countries. However, the chromium content in 304 stainless steel typically ranges from 17.5% to 20%, while the nickel content typically falls between 8% and 10.5%.

Considering the role of alloy elements in stainless steel, it can be determined that within the specified range of the corresponding material standard, the higher the chromium and nickel content in stainless steel, the better its quality.

How much more chromium is called stainless steel?

Definition of Stainless Steel: Stainless steel is a type of steel that is known for its resistance to corrosion and staining. It is characterized by a chromium content of at least 10.5% and a carbon content of no more than 1.2%.

It is important to note that the chromium content in stainless steel plays a crucial role in determining its resistance to corrosion.

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Shane
Author

Shane

Founder of MachineMFG

As the founder of MachineMFG, I have dedicated over a decade of my career to the metalworking industry. My extensive experience has allowed me to become an expert in the fields of sheet metal fabrication, machining, mechanical engineering, and machine tools for metals. I am constantly thinking, reading, and writing about these subjects, constantly striving to stay at the forefront of my field. Let my knowledge and expertise be an asset to your business.

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