9Ni-4Co-0.20C Steel Q&T

Verifiedmetal

9Ni-4Co-0.20C steel is a high-strength, low-alloy steel containing 9% nickel and 4% cobalt designed for cryogenic and ultra-high-strength aerospace applications, with the Q&T (quenched and tempered) condition providing yield strengths in the 1,400–1,650 MPa range and excellent toughness at temperatures down to -196°C. Specified per AMS 6523 for use in missile motor cases, rocket bodies, and other critical structural components requiring superior strength-to-weight ratios and fracture toughness in extreme environments.

aerospacestructural

Compliance & Regulations

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

9Ni-4Co-0.20C Steel/9Ni-4Co-0.20C Steel Q&T

Units:

si imperial

Property OverviewNormalized to typical max values

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Property	Value	Unit	Conditions
Compressive Modulus(Ec)	28,800	ksi	22°C · Plate
Compressive Yield Strength(Fcy)4 entries	188	ksi	22°C · Plate · Quenched and tempered · AMS 6523 · L · t=<0.250 in
↳	188	ksi	22°C · Plate · Quenched and tempered · AMS 6523 · L · t=≥0.250 in
↳	187	ksi	22°C · Plate · Quenched and tempered · AMS 6523 · LT · t=<0.250 in
↳	187	ksi	22°C · Plate · Quenched and tempered · AMS 6523 · LT · t=≥0.250 in
Elongation at Break(εf)2 entries	5.000	-	22°C · Plate · Quenched and tempered · AMS 6523 · LT · t=<0.250 in
↳	10.00	-	22°C · Plate · Quenched and tempered · AMS 6523 · LT · t=≥0.250 in
Poisson's Ratio(ν)	0.3000	-	22°C
Reduction of Area(RA)2 entries	45.00	-	22°C · Plate · Quenched and tempered · AMS 6523 · LT · t=<0.250 in
↳	45.00	-	22°C · Plate · Quenched and tempered · AMS 6523 · LT · t=≥0.250 in
Shear Modulus(G)	11,100	ksi	22°C · Plate
Ultimate Shear Strength(Fsu)2 entries	114	ksi	22°C · Plate · Quenched and tempered · AMS 6523 · t=<0.250 in
↳	114	ksi	22°C · Plate · Quenched and tempered · AMS 6523 · t=≥0.250 in
Ultimate Tensile Strength(σUTS)4 entries	186	ksi	22°C · Plate · Quenched and tempered · AMS 6523 · L · t=<0.250 in
↳	186	ksi	22°C · Plate · Quenched and tempered · AMS 6523 · L · t=≥0.250 in
↳	190	ksi	22°C · Plate · Quenched and tempered · AMS 6523 · LT · t=<0.250 in
↳	190	ksi	22°C · Plate · Quenched and tempered · AMS 6523 · LT · t=≥0.250 in
Yield Strength (0.2% offset)(σy)4 entries	173	ksi	22°C · Plate · Quenched and tempered · AMS 6523 · L · t=<0.250 in
↳	173	ksi	22°C · Plate · Quenched and tempered · AMS 6523 · L · t=≥0.250 in
↳	175	ksi	22°C · Plate · Quenched and tempered · AMS 6523 · LT · t=<0.250 in
↳	175	ksi	22°C · Plate · Quenched and tempered · AMS 6523 · LT · t=≥0.250 in
Young's Modulus(E)	28,800	ksi	22°C · 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.

Rows with are inherited from the base material

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

Property	Value	Unit	Conditions	Source
Density(ρ)	0.2830	lb/in³	22°C

Rows with are inherited from the base material

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

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.

9Ni-4Co-0.20C Steel Q&T

Mechanical Properties

Physical Properties

Regulatory Screening

Environmental

Quality & Standards

Industry-Specific