Carpenter 158

UNS #T51606

Carpenter 158 is a chrome-nickel alloy steel with an analysis representing the best case hardening steel known for parts subject to heavy shock and wear. This alloy is ideally suited for jobs where an extra measure of core strength is required. Fully treated, Carpenter 158 attains a core strength of approximately 160 ksi (1103 MPa) tensile strength with a yield point of approximately 135 ksi (931 MPa). These high mechanical properties are developed in sections up to 5" (127 mm) thick, making Carpenter 158 a consideration for use in very large parts requiring maximum strength, wear resistance, and toughness. To eliminate breakage at trouble-spots, it is also used in replacement parts for finished assemblies where the load on a part has been underestimated or where space or weight limitations prevent redesigning for heavier parts.

Type Analysis

  • Carbon (Nominal) 0.1
  • Silicon (Nominal) 0.3
  • Nickel (Nominal) 3.5
  • Manganese (Nominal) 0.5
  • Chromium (Nominal) 1.5
  • Iron (Nominal) Balance


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Applicable Specifications

  • AMS 6265
  • ASTM A646
  • QQ-S-624C
  • SAE J1249





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