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HP9-4-30 UNS K91283

HP 9-4-30 steel is a low alloy, high strength steel with a high nickel and cobalt content to promote toughness. The alloy has been designed to have high hardenability, good weldability and excellent fracture toughness. It is typically used in the 220-240 KSI tensile strength range. This alloy is commonly used for aircraft structural components, rocket motor cases, armor plate, pressure valves and gears.

AMS 6526Steel Bars and Forgings. Vacuum Arc Re-Melted.
BMS7-182 TY IISteel Bar and Forgings.