ASTM A514 vs Q690D
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
ASTM A514
Structural & HSLA Steel
ASTM A514 is the American 100 ksi yield Q&T alloy plate, used where section weight must come down without giving up strength. Each of its letter grades is a different alloy system engineered for weldable high strength in thick plate.
Standards: DIN S690QL (near) · AISI A514 · GB Q690D (near)
Q690D
Structural & HSLA Steel
Q690D is China’s 690 MPa Q&T structural plate, produced by mills such as Wugang and Baowu for cranes, mining trucks and hydraulic supports. Quality D adds a −20 °C impact guarantee over the base grade.
Standards: DIN S690QL (near) · AISI A514 (near) · GB Q690D (GB/T 1591)
Chemical composition compared (%)
| Element | ASTM A514 | Q690D |
|---|---|---|
| C | 0.12–0.21 (Gr.B) | ≤0.18 |
| Si | 0.20–0.35 (Gr.B) | ≤0.50 |
| Mn | 0.70–1.00 (Gr.B) | ≤2.00 |
| Cr | 0.40–0.65 (Gr.B) | — |
| Mo | 0.15–0.25 (Gr.B) | — |
| V | 0.03–0.08 (Gr.B) | — |
| B | 0.0005–0.005 (Gr.B) | — |
| P | — | ≤0.025 |
| S | — | ≤0.020 |
Properties compared
| Property | ASTM A514 | Q690D |
|---|---|---|
| Yield strength | ≥690 MPa | ≥690 MPa (≤50 mm) |
| Tensile strength | 760–895 MPa (≤65 mm) | 770–940 MPa |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
| Impact | — | D grade: 34 J at −20 °C (typ.) |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: ASTM A514 · Q690D. Substitution decisions for certified parts stay with the design authority.