15Ni-15Co-3.1Mo Maraging Steel

metal

15Ni-15Co-3.1Mo is a maraging steel—a high-strength, low-carbon iron alloy strengthened by precipitation hardening rather than carbon content, making it exceptionally tough and weldable compared to conventional high-strength steels. This grade is used in aerospace structures, tooling, and demanding mechanical components where a combination of high strength, fracture toughness, and dimensional stability after heat treatment is critical. Engineers select maraging steels when conventional hardened alloy steels would be too brittle, when welding without embrittlement is essential, or when tight dimensional tolerances must be maintained through the hardening cycle.

aerospace structural componentsprecision molds and dieslanding gear and fastenersmilitary ordnance and pressure vesselshigh-performance toolingrocket motor cases

Compliance & Regulations

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

Units:

si imperial

Property OverviewNormalized to typical max values

Property	Value	Unit	Conditions
Elongation at Break(εf)	13.60	-	—
Ultimate Tensile Strength(σUTS)	243	ksi	—
Yield Strength (0.2% offset)(σy)	229.2	ksi	—

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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.