1Cr13 (GB 12Cr13; ASTM 410) is a martensitic stainless round bar with mechanical properties that contrast sharply with 304:
Tensile strength: 540–740 MPa (higher than 304's 515 MPa minimum), due to its higher carbon content (0.11–0.17% vs. 304's ≤0.08%).
Hardness: 200–260 HB after annealing, but can be quenched to 38–45 HRC for wear resistance-304 remains soft (≤201 HB) even after heat treatment.
Corrosion resistance: Lower than 304 (no nickel), but sufficient for mild environments like freshwater valves.
Ductility: 15–20% elongation (lower than 304's 40%), limiting its use in forming applications.
1Cr13 is used in cutlery, pump shafts, and turbine blades-applications requiring moderate corrosion resistance and high hardness. It is cheaper than 304, making it popular in cost-sensitive industrial components.