Valour Alloys Inc. is the worldwide Leading Distributor of 17-4PH Material and Ready Stock Inventory of all types of pipe and tubes and other engineering metal products including 17-4 PH (Precipitation Hardening) Stainless Steel is a high-strength, corrosion-resistant alloy widely used in engineering applications that require excellent mechanical properties and good corrosion resistance. It is a martensitic stainless steel that can be heat-treated to achieve different levels of hardness and strength.