What does 400 series stainless steel mean？
Jun 05, 2025
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The 400 series stainless steel has the characteristics of good thermal conductivity, low coefficient of expansion, corrosion resistance, and oxidation resistance, and is widely used in automotive exhaust systems, kitchenware, household appliances, and other fields.
Structure type:
Ferritic stainless steel: with a body centered cubic crystal structure, it is resistant to chloride stress corrosion, but has poor plasticity.
Martensitic stainless steel: its properties can be adjusted through heat treatment, with high hardness (such as Cr13 type), suitable for cutting tools, etc
Comparison Between 400 Series and 300 Series Stainless Steels
|
Comparison Dimension |
400 Series Stainless Steel |
304 Stainless Steel (300 Series) |
|---|---|---|
|
Main Composition |
High chromium, nickel-free |
18% chromium + 8% nickel |
|
Corrosion Resistance |
Moderate, suitable for general environments |
Excellent, suitable for strong acid-base environments |
|
Cost |
Lower |
Higher |
|
Magnetism |
Magnetic |
Non-magnetic (or weakly magnetic) |
|
Typical Applications |
Automotive parts, kitchenware |
Food processing, medical devices |
What are the key characteristics of 400 series stainless steel?
High thermal conductivity and low thermal expansion coefficient, suitable for high-temperature environments (such as car exhaust pipes).
Resistant to atmospheric, water vapor, and oxidizing acid corrosion, but with weaker resistance to strong acidity and alkalinity than 304 stainless steel.
Magnetic and mechanically superior to carbon steel
What is SS400 steel grade?
The grade of SS400 steel is ordinary carbon structural steel. SS400 is a marking method for Japanese steel, which belongs to ordinary carbon structural steel and complies with JIS G3101 standard. The lower limit of its tensile strength is 400MPa, hence it is called SS400. SS400 is equivalent to Q235 steel in China, also known as A3 steel
What are the main models of 400 series stainless steel?
The main models of 400 series stainless steel include 430, 409L, 410, 420, 440, 436L, 444, 439, 441, 429, 445, 446M, etc
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