9Ni-4Co-0.20C Steel Q&T
Verifiedmetal9Ni-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.
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Property OverviewNormalized to typical max values
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| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
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.
Rows with are inherited from the base material
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| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 0.2830 | lb/in³ | 22°C |
Rows with are inherited from the base material
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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.