1.25C 7.9Ni-0.3Mo-0.4Cr Low Alloy Steel

metal

This is a high-carbon, nickel-rich low-alloy steel with significant cobalt content (3.69%), designed to achieve very high strength through precipitation hardening and martensitic transformation. The composition—dominated by iron with 7.86% nickel, 1.25% carbon, and cobalt as a strengthening addition—represents a specialty alloy used in applications demanding extreme hardness and wear resistance combined with some toughness. Such alloys are employed in demanding tool and die applications, aerospace components requiring high strength-to-weight ratios, and specialized bearing or fastener systems where conventional steels fall short; the cobalt and nickel additions improve both high-temperature strength retention and fatigue performance compared to plain carbon steels.

precision tool steelsaerospace fasteners and structural componentshigh-strength bearing applicationsdie casting dies and moldsspecialized industrial cutting tools

Compliance & Regulations

?ISO 10993?Conflict Free?RoHS?REACH?TSCA?Prop 65

Units:

si imperial

Property	Value	Unit	Conditions	Source
Elongation at Break(εf)	—	-	—	—
Ultimate Tensile Strength(σUTS)	—	ksi	—	—
Yield Strength (0.2% offset)(σy)	—	ksi	—	—

Verified Unverified Low confidence (<80%) Link to source

Regulatory Screening

Environmental

Safety & Biocompatibility

Quality & Standards

Industry-Specific

RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.