In the stainless steel industry, SUS304 vs SS304 is often mentioned. The two materials have many similarities in chemical composition, performance, and application, but there are also some key differences. This article will take a deep dive into the two stainless steels to help you understand their characteristics so that you can make the right choice.
What are SUS304 and SS304?
SUS304:
SUS stands for “Steel Use Stainless” and is a mark for stainless steel in the Japanese Industrial Standard (JIS). SUS304 is mainly composed of chromium and nickel and has good corrosion resistance and formability.
SS304:
SS is the abbreviation of “Stainless Steel”, which is commonly used in standards in the United States and other regions. The composition of SS304 is similar to SUS304, and it also has excellent corrosion resistance and mechanical properties.
See also our 304 Stainless Steel Products:
Comparison between SUS304 and SS304
Chemical Composition SUS304 VS SS304 Stainless Steel:
Although SUS304 and SS304 are identical in most cases, there are slight differences in their chemical composition that may affect their performance:
SUS304:
- Cr: 18%
- Ni: 8%
- C: ≤0.08%
SS304:
- Cr: 18%
- Ni: 8%
- C: ≤0.08%
In general, the two are almost identical in composition, but the manufacturing standards and testing methods may differ.
Performance Comparison SUS304 VS SS304 Stainless Steel:
- Corrosion Resistance: Both have excellent corrosion resistance and are suitable for use in a variety of environments, especially in high humidity and chemical corrosion.
- Strength and Toughness: Both SUS304 and SS304 exhibit good strength and toughness and can withstand high temperatures and pressures.
- Processability: SUS304 may be slightly superior in cold working, especially in the forming process of thin sheets.
Application Areas SUS304 VS SS304 Stainless Steel:
- SUS304: Widely used in food processing equipment, medical equipment, architectural decoration, and chemical industry.
- SS304: Mostly used in the manufacture of automotive parts, home appliances, and kitchen utensils.
Weldability SUS304 VS SS304 Stainless Steel:
- SUS304: Generally has good weldability and is suitable for a variety of welding methods, such as arc welding, argon arc welding, etc. Due to its high nickel content, it is not easy to become brittle after welding.
- SS304: Also has good weldability and is suitable for various welding techniques. Its toughness and strength are well maintained after welding.
Machinability SUS304 VS SS304 Stainless Steel:
SUS304 and SS304 are similar in machinability, but there may be slight differences under certain conditions. Choosing the right processing tools and processes can ensure the best processing results when using these two stainless steels. In specific applications, it is recommended to test and evaluate according to actual needs to ensure processing quality and efficiency.
Cost SUS304 VS SS304 Stainless Steel:
- SUS304: As part of the Japanese Industrial Standard (JIS), SUS304 is relatively common in manufacturing and supply chains in and around Japan. Therefore, its price may be affected by market conditions in Japan.
- SS304: As a US standard, SS304 is more common in North America and around the world. Its price is usually closely related to factors such as global market demand and raw material costs.
Selection Guide
When choosing between SUS304 or SS304, consider the following factors:
Application environment:
If you are in Japan or need to follow Japanese standards, SUS304 is a more suitable choice; in other regions, SS304 is more common.
Budget and availability:
Sometimes price and supply chain issues will also affect your choice. Choose a more cost-effective product based on market conditions.
In Conclusion
Although SUS304 and SS304 are very similar in composition and performance, understanding the subtle differences between them can help you make the best choice in actual applications. No matter which stainless steel you choose, it will provide excellent corrosion resistance and mechanical properties for your project.
Frequently Asked Questions
Can SUS304 and SS304 be used interchangeably?
In most cases, they can be used interchangeably, but it is best to confirm based on specific standards.
How to Clean Stainless Steel Surfaces?
Use warm water and neutral detergents, and avoid abrasive materials such as steel wool.
Will Stainless Steel Rust?
Although stainless steel is corrosion-resistant, it may still rust in extreme environments.