PH13-8Mo stainless steel, American precipitation hardening type stainless steel. 0Cr13Ni8Mo2Al (PH13-8Mo) steel is a high strength martensitic precipitation hardening stainless steel which is smelted by double vacuum.

Chinese name PH13-8Mo stainless steel standard AISI, ASTM type PH13-8MoUNS number S13800

As with other precipitation hardened stainless steels, it has the best corrosion resistance in a fully hardened state. Although under severe test conditions, PH13-8Mo steel is somewhat sensitive to hydrogen embrittlement at various temperatures below 565 ° C, hydrogen embrittlement cracking accidents are rare in practical use. Aging at temperatures above 595 ° C is immune to hydrogen induced cracking. In addition, this steel has the best resistance to sulfide stress corrosion cracking at 595 ° C or above. Its outstanding feature is that it has excellent fracture toughness, good transverse mechanical properties and resistance to stress corrosion in the marine environment, in addition to high strength. In order to accurately control the chemical composition of steel, reduce the gas content in steel, and improve the purity, VIM+VAR double vacuum smelting process should be adopted in production. Due to the good comprehensive performance of steel, it has been widely used in aerospace, nuclear reactor and petrochemical industries. Such as cold tops and machined fasteners, aircraft parts, nuclear reactor components and petrochemical equipment.