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.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Compressive Modulus(Ec) | 198.6 | GPa | 22°C · Plate | ||
Compressive Yield Strength(Fcy)4 entries | 1.296 | GPa | 22°C · Plate · Quenched and tempered · AMS 6523 · L · t=<0.250 in | ||
| ↳ | 1.296 | GPa | 22°C · Plate · Quenched and tempered · AMS 6523 · L · t=≥0.250 in | ||
| ↳ | 1.289 | GPa | 22°C · Plate · Quenched and tempered · AMS 6523 · LT · t=<0.250 in | ||
| ↳ | 1.289 | GPa | 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) | 76.53 | GPa | 22°C · Plate | ||
Ultimate Shear Strength(Fsu)2 entries | 786.0 | MPa | 22°C · Plate · Quenched and tempered · AMS 6523 · t=<0.250 in | ||
| ↳ | 786.0 | MPa | 22°C · Plate · Quenched and tempered · AMS 6523 · t=≥0.250 in | ||
Ultimate Tensile Strength(σUTS)4 entries | 1.282 | GPa | 22°C · Plate · Quenched and tempered · AMS 6523 · L · t=<0.250 in | ||
| ↳ | 1.282 | GPa | 22°C · Plate · Quenched and tempered · AMS 6523 · L · t=≥0.250 in | ||
| ↳ | 1.310 | GPa | 22°C · Plate · Quenched and tempered · AMS 6523 · LT · t=<0.250 in | ||
| ↳ | 1.310 | GPa | 22°C · Plate · Quenched and tempered · AMS 6523 · LT · t=≥0.250 in | ||
Yield Strength (0.2% offset)(σy)4 entries | 1.193 | GPa | 22°C · Plate · Quenched and tempered · AMS 6523 · L · t=<0.250 in | ||
| ↳ | 1.193 | GPa | 22°C · Plate · Quenched and tempered · AMS 6523 · L · t=≥0.250 in | ||
| ↳ | 1.207 | GPa | 22°C · Plate · Quenched and tempered · AMS 6523 · LT · t=<0.250 in | ||
| ↳ | 1.207 | GPa | 22°C · Plate · Quenched and tempered · AMS 6523 · LT · t=≥0.250 in | ||
Young's Modulus(E) | 198.6 | GPa | 22°C · Plate |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 7.833 | kg/m³ | 22°C |