9Ni-4Co-0.30C Steel Q&T
Verifiedmetal9Ni-4Co-0.30C steel in Q&T (quenched and tempered) condition is a high-strength, low-alloy steel designed for aerospace structural applications requiring yield strengths in the 1,380–1,720 MPa range with good fracture toughness and fatigue resistance. This nickel-cobalt-carbon composition is specified in AMS 6524a and AMS 6526 for critical fasteners, forgings, and structural components where a combination of high bearing strength, compressive yield strength, and controlled ductility is essential for damage-tolerant design.
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Property OverviewNormalized to typical max values
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| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Ultimate Bearing Strength(Fbru)4 entries | 346 | ksi | 22°C · Sheet/Strip/Plate · Quenched and tempered · AMS 6524a · t=≥0.250 in · e/D=1.5 | ||
| ↳ | 346 | ksi | 22°C · Bar/Forging/Tubing · Quenched and tempered · AMS 6526 · t=≤4.000 in · e/D=1.5 | ||
| ↳ | 440 | ksi | 22°C · Sheet/Strip/Plate · Quenched and tempered · AMS 6524a · t=≥0.250 in · e/D=2 | ||
| ↳ | 440 | ksi | 22°C · Bar/Forging/Tubing · Quenched and tempered · AMS 6526 · t=≤4.000 in · e/D=2 | ||
Bearing Yield Strength(Fbry)4 entries | 291 | ksi | 22°C · Sheet/Strip/Plate · Quenched and tempered · AMS 6524a · t=≥0.250 in · e/D=1.5 | ||
| ↳ | 291 | ksi | 22°C · Bar/Forging/Tubing · Quenched and tempered · AMS 6526 · t=≤4.000 in · e/D=1.5 | ||
| ↳ | 322 | ksi | 22°C · Sheet/Strip/Plate · Quenched and tempered · AMS 6524a · t=≥0.250 in · e/D=2 | ||
| ↳ | 322 | ksi | 22°C · Bar/Forging/Tubing · Quenched and tempered · AMS 6526 · t=≤4.000 in · e/D=2 | ||
Compressive Modulus(Ec) | 29,800 | ksi | 22°C · Sheet/Strip/Plate | ||
Compressive Yield Strength(Fcy)2 entries | 209 | ksi | 22°C · Bar/Forging/Tubing · Quenched and tempered · AMS 6526 · L · t=≤4.000 in | ||
| ↳ | 209 | ksi | 22°C · Sheet/Strip/Plate · Quenched and tempered · AMS 6524a · LT · t=≥0.250 in | ||
Elongation at Break(εf)3 entries | 10.00 | - | 22°C · Bar/Forging/Tubing · Quenched and tempered · AMS 6526 · L · t=≤4.000 in | ||
| ↳ | 6.000 | - | 22°C · Sheet/Strip/Plate · Quenched and tempered · AMS 6524a · LT · t=≤0.249 in | ||
| ↳ | 10.00 | - | 22°C · Sheet/Strip/Plate · Quenched and tempered · AMS 6524a · LT · t=≥0.250 in | ||
Reduction of Area(RA)2 entries | 40.00 | - | 22°C · Bar/Forging/Tubing · Quenched and tempered · AMS 6526 · L · t=≤4.000 in | ||
| ↳ | 35.00 | - | 22°C · Sheet/Strip/Plate · Quenched and tempered · AMS 6524a · LT · t=≥0.250 in | ||
Ultimate Shear Strength(Fsu)2 entries | 137 | ksi | 22°C · Sheet/Strip/Plate · Quenched and tempered · AMS 6524a · t=≥0.250 in | ||
| ↳ | 137 | ksi | 22°C · Bar/Forging/Tubing · Quenched and tempered · AMS 6526 · t=≤4.000 in | ||
S–N Curve (Wöhler)(S–N) | Curve (14 pts) | ksi | — | ||
Ultimate Tensile Strength(σUTS)3 entries | 220 | ksi | 22°C · Bar/Forging/Tubing · Quenched and tempered · AMS 6526 · L · t=≤4.000 in | ||
| ↳ | 220 | ksi | 22°C · Sheet/Strip/Plate · Quenched and tempered · AMS 6524a · LT · t=≤0.249 in | ||
| ↳ | 220 | ksi | 22°C · Sheet/Strip/Plate · Quenched and tempered · AMS 6524a · LT · t=≥0.250 in | ||
Yield Strength (0.2% offset)(σy)3 entries | 190 | ksi | 22°C · Bar/Forging/Tubing · Quenched and tempered · AMS 6526 · L · t=≤4.000 in | ||
| ↳ | 185 | ksi | 22°C · Sheet/Strip/Plate · Quenched and tempered · AMS 6524a · LT · t=≤0.249 in | ||
| ↳ | 190 | ksi | 22°C · Sheet/Strip/Plate · Quenched and tempered · AMS 6524a · LT · t=≥0.250 in | ||
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.
Rows with are inherited from the base material
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| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 0.2800 | lb/in³ | 22°C |
Rows with are inherited from the base material
Verified Unverified Low confidence (<80%) Link to source
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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.