Executive standard: American ASTMS17400, ASTM A564 630, UNS630

17-4PH is a martensitic precipitation hardening stainless steel. In addition to directly obtaining martensitic structure after solid solution treatment, this steel is further strengthened by subsequent aging treatment-obtaining precipitation hardening phase (copper-containing phase).

17-4PH is a precipitated, hardened, martensitic stainless steel composed of copper, niobium/columbium. This grade has high strength, hardness (up to 300º C/572º F) and corrosion resistance. After heat treatment, the mechanical properties of the product are more perfect, and can reach a compressive strength as high as 1100-1300 mpa (160-190 ksi).

17-4PH chemical composition

C: ≤0.07

Cr: 15.5~17.5


Cu: 3.5~5.0;

Nb: 0.45~0.5

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