​Common Grades of Stainless Steel Channel Steel

Common Grades of Stainless Steel Channel Steel

Popular stainless steel grades for channel steel:

201, 202, 301, 303, 304, 304L, 316, 316L, 321, 310S, 401, 409, 410, 420J1, 420J2, 430, 439, 443, 444.

Stainless steel is rust-resistant, and many grades offer excellent corrosion resistance. Its protection comes from a chromium-rich passive film on the surface, and this property is relative. Higher chromium content greatly improves corrosion resistance in air, fresh water and nitric acid.

Stainless steel is classified by microstructure, composition, application and performance: austenitic, ferritic, duplex and martensitic types. Widely used in metallurgy, light industry, daily goods and architectural decoration for great corrosion resistance, formability and toughness.

✅ Austenitic Stainless Steel

Classic 18-8 series (18% Cr, 8–10% Ni). Non-magnetic, good ductility and toughness. Cannot be hardened by heat treatment; only cold working for strengthening.

304L, 316L and Ti/Nb-stabilized grades resist intergranular corrosion. Mo-alloyed grades withstand sulfuric acid, acetic acid and urea. Comprehensive performance for general and medium corrosion environments.

✅ Type 430 Ferritic Stainless Steel

Ferritic structure, 11–30% Cr, normally nickel-free. High thermal conductivity, low thermal expansion, good oxidation and stress corrosion resistance.

Suitable for air, steam and fresh water environments. Traditional weakness: poor post-weld ductility. Modern AOD/VOD refining reduces C & N and expands its application.

✅ Duplex Stainless Steel

Balanced ferrite + austenite structure (Cr:18–28%, Ni:3–10%). Alloyed with Mo, N, Cu etc.

Combines merits of austenitic and ferritic steel. Higher strength than austenitic grades. Excellent resistance to pitting and chloride stress corrosion cracking. Nickel-saving grade with reliable weldability.

✅ Martensitic Stainless Steel

Hardenable stainless steel, typical Cr13 series: 2Cr13, 3Cr13, 4Cr13.

Adjustable strength and toughness via quenching & tempering. Main uses: turbine blades, cutlery and surgical tools. Includes martensitic chromium steel, chromium-nickel steel and precipitation-hardening grades.