What are the types of stainless steel materials?
Stainless steel encompasses a wide variety of grades, but can be broadly categorized into five main types based on their microstructure.
Five Major Categories of Stainless Steel
The table below provides a quick comparison of the five major categories of stainless steel.
|
Classification |
Core Features |
Main drawbacks |
Typical Applications |
|
Austenitic stainless steel |
Non-magnetic, excellent corrosion resistance, good plasticity, and easy to weld |
Lower strength, relatively higher price |
Kitchenware, Architectural Decorations, Chemical Equipment, Food and Pharmaceuticals |
|
Ferritic stainless steel |
Magnetic, resistant to stress corrosion, low cost |
Poor plasticity, susceptibility to pitting corrosion, poor weldability |
Appliance casings, automotive exhaust pipes, interior decoration |
|
Martensitic stainless steel |
Magnetic, high strength, high hardness, wear-resistant |
Poor corrosion resistance, poor weldability |
Cutting tools, measuring tools, bearings, valve components |
|
Duplex stainless steel |
High strength, excellent resistance to chloride stress corrosion |
High processing difficulty and high cost |
Offshore platforms, petrochemical plants, chemical tankers |
|
Precipitation-hardening stainless steel |
Ultra-high strength, with properties adjustable through heat treatment |
Complex manufacturing processes and high costs |
Aerospace components, gears, high-strength shafts |
Summary: How to make a quick selection?
| For non-magnetic, universal corrosion resistance | Austenitic |
| For low cost and magnetic properties | Ferritic |
| For high hardness and cutting tools | Martensitic |
| For ultra-high strength and seawater corrosion resistance | Duplex steel |
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