What is SUS201 stainless steel?

Core Identity & Equivalent Grades

UNS Number: S20100

ASTM/AISI Equivalent: 201 stainless steel

EU EN Equivalent: 1.4372

Chinese GB Equivalent: 12Cr17Mn6Ni5N

Key Chemical Composition (wt%)

Element	Content Range
Chromium (Cr)	16.00–18.00
Nickel (Ni)	3.50–5.50
Manganese (Mn)	5.50–7.50
Nitrogen (N)	0.25 max
Carbon (C)	0.15 max
Silicon (Si)	1.00 max
Phosphorus (P)	0.060 max
Sulfur (S)	0.030 max

Main Properties

Cost Advantage: Replaces a portion of nickel (a high-cost alloy) with manganese and nitrogen, reducing raw material costs significantly compared to SUS304.

Corrosion Resistance: Performs well in mildly corrosive environments (indoor air, fresh water, neutral solutions) but is less resistant to chloride-induced pitting or outdoor marine exposure than SUS304.

Formability & Weldability: Features good ductility for deep drawing, bending, and stamping; can be welded via standard methods (TIG, MIG), though post-weld heat treatment may be needed for some high-stress applications.

Mechanical Performance: Annealed tensile strength ≥550 MPa, yield strength ≥275 MPa, elongation ≥40%. Cold working can enhance its strength substantially, suitable for structural components requiring higher hardness.

Magnetism: Non-magnetic in the annealed state; cold working may introduce weak magnetism.

Typical Applications

Decorative components: Handrails, door frames, signage, stainless steel trim

Household goods: Budget-friendly kitchen utensils, sink basins, appliance casings

Light structural parts: Storage racks, shelving, display stands

Automotive parts: Interior trim, wheel covers, exhaust components (non-marine use)