| Chemical composition (weight %) (Maximum values unless range is shown) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| O | N | C | H | Fe | Al | V | Ni | Mo | Others | Residuals | |
| 0.13 | 0.03 | 0.08 | 0.0125 | 0.25 | 5.5–6.5 | 3.5–4.5 | 0.4 | ||||
An alpha-beta alloy based on Grade 5. The amount of interstitial elements (O, N, C)
is reduced. Improved stress corrosion cracking (SCC) properties in seawater compared
to Grade 5. Especially suited for thick wall highly stressed parts.
| Mechanical properties at room temperature | ||
|---|---|---|
| Minimum values | Typical values | |
| Yield Strength | 790(760) MPa | 825 MPa |
| Ultimate Strength | 860(825) MPa | 895 MPa |
| Elongation in 50 mm, A5 | 10(7.5)% | 15% |
| Reduction in Area | 25(15)% | % |
| Hardness | 350 HV | |
| Modulus of elasticity | 114 GPa | |
| Charpy V-Notch Impact | 24–40 J | |