HP 9-4-30

UNS #K91283

HP 9-4-30 VAC-ARC 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 220/240,000 psi (1517/1655 MPa) tensile strength range. HP 9-4-30 steel is produced by the consumable electrode vacuum arc remelting process to provide optimum cleanliness and preferred ingot structure.

Type Analysis

  • Carbon (Nominal) 0.3
  • Silicon (Nominal) 0.1
  • Nickel (Nominal) 7.5
  • Manganese (Nominal) 0.3
  • Chromium (Nominal) 1
  • Cobalt (Nominal) 4.5
  • Molybdenum (Nominal) 1
  • Iron (Nominal) Balance
  • Vanadium (Nominal) 0.1


Request a Quote

Applicable Specifications

  • AMS 6526
  • McDonnell Douglas MMS 2102
  • Boeing BMS 7-182
  • Rockwell STO160LB0012





Browse our growing library of resources including case studies, product brochures, technical data sheets, product selection guides and more.