410 (Martensitic) vs. 304 (Austenitic): Hardened Tool Grade vs. Corrosion-Resistant Grade

410 Stainless Steel (Martensitic)

Type: Martensitic (can be heat-treated).

Key Feature: High hardness, strength, and wear resistance after hardening.

Composition: Lower Nickel, higher Carbon than 304.

Corrosion Resistance: Good in mild environments (dry air, clean water) but rusts in humid/chloride conditions.

Best For: Cutlery, fasteners, valves, and parts needing strength and hardness (like tools).

304 Stainless Steel (Austenitic)

Type: Austenitic (non-magnetic, not heat-hardenable).

Key Feature: Excellent corrosion resistance, ductility, formability, weldability.

Composition: High Chromium (18%) & Nickel (8%).

Corrosion Resistance: Superior, good for marine/freshwater; resists pitting well.

Best For: Kitchen sinks, food processing, architectural trim, general fabrication, automotive.