Is 304 stainless steel the same as 0cr18ni9?

Is 304 Stainless Steel the Same as 0Cr18Ni9?

When comparing stainless steel grades across different standards, many engineers and buyers wonder: Is 304 stainless steel the same as 0Cr18Ni9? The short answer is yes - but the names reflect different standard systems.

 

1. Different Naming Systems, Same Material

304 stainless steel is the designation used in ASTM and AISI standards (mostly used in the US and internationally).

0Cr18Ni9 is the old Chinese GB (Guobiao) designation for the same material, still commonly used in China.

Despite the different names, both grades refer to an austenitic stainless steel with approximately 18% chromium and 9% nickel, known for its excellent corrosion resistance, formability, and durability.

 2.304 Stainless Steel Chemical Composition Comparison

Element	304 (ASTM A240)	0Cr18Ni9 (GB)
C	≤ 0.08%	≤ 0.08%
Cr	18.0–20.0%	17.0–19.0%
Ni	8.0–10.5%	8.0–10.0%
Fe	Balance	Balance

The chemical differences are minimal, and in practice, 304 and 0Cr18Ni9 are interchangeable for most applications.

3. Modern Chinese Equivalent: 06Cr19Ni10

In 2000, China updated its stainless steel naming system:

0Cr18Ni9 became 06Cr19Ni10, aligning more closely with international standards.

"06" stands for a maximum of 0.06% carbon content.

"Cr19" and "Ni10" indicate approx. 19% chromium and 10% nickel.

Still, 0Cr18Ni9 is widely used in older engineering documents and in many procurement processes.

4. Practical Usage & Applications

Whether labeled as 304 or 0Cr18Ni9, this stainless steel is ideal for:

Kitchen equipment and sinks

Food processing and storage

Heat exchangers and chemical tanks

Architectural and decorative applications

Piping systems in non-aggressive environments

5. Conclusion: Yes, They Are the Same

304 stainless steel and 0Cr18Ni9 are the same grade in different standards.
If you're sourcing materials globally, it's important to recognize these naming conventions to ensure you're selecting the right product.