A martensitic family that can be hardened by heat treatment. With its higher carbon content, 420 can reach hardness levels suited to cutting and blade applications; 410 offers a balance of strength and toughness with lower carbon. Hardness and strength values vary widely with the heat treatment applied.
MartensiticASTM A240 / EN 10088-2 (1.4021 / 1.4006)
Typical annealed-condition reference values. Actual values vary with product form (sheet, coil, bar), thickness and heat treatment; exact values are given in the mill certificate supplied with the shipment.
