UNS S15500, ASTM A 564, ASTM A 693, ASTM A 705, AMS 5659, AMS 5862, STD 2154, ASME SA 564, SA693, SA705, Other:  BAC 5439 Rev H Class A Type1, BMS7-240G Type 1, BSS7055 Rev A

Introduction

Stainless steel 15 – 5 PH, also known as XM-12 or UNS S15500, is a modification of 17-4 PH developed in the 1960s. It has a more refined microstructure obtained through the remelting process. This refined structure improves toughness of the material. UNS S15500 also has low temperature hardening, good fabrication properties and excellent corrosion resistance, which makes it suitable for many industries. It can be machined in the solution-annealed state or in final heat treat condition. The strength and ductility of UNS S15500 can be enhanced through heating the material at different temperatures.

UNS S15500 is a martensitic precipitation hardening type stainless steel. Martensitic stainless steels were designed to be corrosion resistant and hardened through heat treatment.