ASTM A514 vs S690QL
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)
S690QL
Structural & HSLA Steel
S690QL is the EN 10025-6 quenched-and-tempered structural steel with 690 MPa minimum yield — the grade behind weight-critical crane booms, mining equipment and mobile machinery in Europe. Its low-temperature toughness (−40 °C) matches the strength, unlike cheaper Q&T plates.
Standards: DIN 1.8928 (S690QL) · AISI A514 (near) · GB Q690D (near)
Chemical composition compared (%)
| Element | ASTM A514 | S690QL |
|---|---|---|
| C | 0.12–0.21 (Gr.B) | ≤0.20 |
| Si | 0.20–0.35 (Gr.B) | ≤0.80 |
| Mn | 0.70–1.00 (Gr.B) | ≤1.70 |
| Cr | 0.40–0.65 (Gr.B) | ≤1.50 |
| Mo | 0.15–0.25 (Gr.B) | ≤0.70 |
| V | 0.03–0.08 (Gr.B) | — |
| B | 0.0005–0.005 (Gr.B) | ≤0.005 |
| P | — | ≤0.020 |
| S | — | ≤0.010 |
| Ni | — | ≤2.00 |
Properties compared
| Property | ASTM A514 | S690QL |
|---|---|---|
| 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 | — | QL: 27 J at −40 °C |
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 · S690QL. Substitution decisions for certified parts stay with the design authority.