SUS440A: Hardened Edges and Grade Choice

SUS440A is a martensitic stainless grade distinct from 440B and 440C. Material reference.

Hardened Edges and Grade Choice

For a hardened edge, identify the required balance between wear and resistance to damage in the actual use. Do not treat the 440 series as one material or select a suffix by its perceived rank. Geometry and the final treatment remain part of the decision.

Manufacturing and acceptance checks

State the exact suffix, delivered condition and final hardness. Specify edge radius, grinding allowance and crack inspection where required. Compare a SUS420 alternative using the same service test and acceptance criterion, and retain the heat-treatment record with the finished-part inspection results.

Compare related options

• SUS440B
• SUS420

Reference and scope

Daido: JIS stainless grade identities and chemistry provides material or specification background. The checks above are purchasing guidance; final acceptance values must come from the agreed grade, product specification and condition.

Send a drawing and material requirements for review. Include quantity, critical dimensions and the inspection evidence required with delivery.