9Ni-4Co-0.30C Steel

Verifiedmetal

# 9Ni-4Co-0.30C Steel Ultra-high-strength nickel-cobalt maraging steel used in aerospace applications requiring exceptional yield strengths (typically 1,379–1,586 MPa) and fracture toughness at cryogenic temperatures. Q&T (quenched and tempered) condition provides controlled hardness and ductility balance suitable for critical load-bearing components in rocket motors, pressure vessels, and landing gear systems.

aerospacestructural

Compliance & Regulations

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

Tempers & Conditions

Q&T

Units:

si imperial

2 interactive curves for this material

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Form

Property	Value	Unit	Conditions
Compressive Modulus(Ec)	29,800	ksi	22°C · Sheet/Strip/Plate
S–N Curve (Wöhler)(S–N)2 entries	Curve (14 pts)	ksi	—
↳	Curve (8 pts)	ksi	—
Young's Modulus(E)	28,500	ksi	22°C · Sheet/Strip/Plate

N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form, heat treatment, basis, or test environment.

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Property	Value	Unit	Conditions	Source
Density(ρ)	0.2800	lb/in³	22°C

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Regulatory Screening

Environmental

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.