There are several common types of stainless steel used in the screws, bolts, and nuts fastener industry. Some of the most common ones include:
Metallography Class / Title
| Features | Main Steel
| Chemical Composition %
| Application |
Austenitic
| Low, Medium Hardness High Corrosion Resistance
| 200 Series
| Mn: 5.5-10 Cr:16-19 Ni:3.5-6 Mo: 0 | Chemical Industry Machine Auto parts Construction Decorations
|
|
| 300 Series (SUS 304, 302, 316)
| Mn: < 2.0 Cr:15-26 Ni: 6-28 Mo: 0.5-7 | Chemical Industry Machine Auto parts Construction Decorations
|
Martensitic
| High Hardness Low Corrosion Resistance Lower Price
| 400 Series (SUS 410) | Mn: < 1.0 Cr:13-15 Ni:0-0.6 Mo:0.5-7 | Medical Instrument Household knives,Scissors |
Ferritic
| Low Hardness Medium Corrosion Resistance Lower Price | 400 Series (SUS 430) | Mn: <1.0 Cr: 16-18 Ni:0 Mo:0
| Rust Resistance High-Temperature Resistant equipment Kitchenware kitchen utensils
|
Precipitation Hardening
| Medium, High Hardness Medium, High Corrosion Resistance | 600 Series
| Mn: <1 Cr: 16-18 Ni: 6.5-7.75 Mo:0 | Aerospace components
|
Duplex
| High Hardness Toughness
| 300 Series
| Mn: <1.15 Cr: 23-28 Ni: 3-6 Mo: 1-3
| Desalination Plants Oil and Gas Industry
|
The specific type of stainless steel used in a fastener will depend on the application requirements, such as strength, corrosion resistance, temperature resistance, and cost.
