What is the chemical composition of sus321 stainless steel?
Comparison between ASTM and JIS standards:
The chemical composition of ASTM 321 (UNS S32100) and JIS SUS321 is basically the same, and both use titanium stabilization to inhibit carbide precipitation.
sus321 stainless steel High temperature resistance:
The long-term use temperature can reach 816℃ (ASTM certified), and the short-term peak temperature is 900℃, which is suitable for power station boilers, automobile exhaust systems and other scenarios.
sus321 stainless steel Application scenarios:
Widely used in welding structures (such as pipelines and heat exchangers) in high temperature environments, and intergranular corrosion must be avoided.
sus321 stainless steel chemical composition
| Element | Content Range | ASTM Standard Explanation |
|---|---|---|
| Carbon (C) | ≤0.08% | Low - carbon design to improve weldability and reduce the risk of intergranular corrosion. |
| Silicon (Si) | ≤1.00% | Silicon can improve oxidation resistance, but an excessive amount will reduce toughness. |
| Manganese (Mn) | ≤2.00% | Enhances strength and acts as a deoxidizer. |
| Phosphorus (P) | ≤0.045% | An impurity element that needs to be strictly controlled to avoid brittleness. |
| Sulfur (S) | ≤0.030% | An impurity element that reduces the ductility and corrosion resistance of the material. |
| Chromium (Cr) | 17.0%–19.0% | Forms a dense oxide film, providing corrosion - resistant and high - temperature - resistant properties. |
| Nickel (Ni) | 9.0%–12.0% | Stabilizes the austenite structure and enhances corrosion resistance and toughness. |
| Titanium (Ti) | ≥5×C% | Combines with carbon to form a stable carbide (TiC), preventing the precipitation of carbides at high temperatures and avoiding intergranular corrosion. |
| Nitrogen (N) | ≤0.10% | A small amount of nitrogen can increase strength, but an excessive amount will increase the risk of welding cracks. |
