S690QL
1.8928High-strength quenched and tempered fine-grain structural steel with minimum yield strength of 690 MPa. Used for heavily loaded structures like mobile cranes, mining equipment, bridges, and pressure vessels.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | ASTM A514 Grade B | K11630 | REF |
| 🇪🇺 | EN | Europe | S690QL | 1.8928 | 100% |
| 🇨🇳 | GB | China | Q690D | — | 93% |
| 🇯🇵 | JIS | Japan | JIS SM570 | — | 80% |
Sources: ASTM A514/A514M, EN 10025-6:2019, GB/T 1591, JIS G3106
Chemical composition comparison (wt%)
Side-by-side: S690QL (EN) (EN 10025-6:2019) vs Q690D (GB)
| Element | S690QL (EN) | Q690D (GB) | Overlap |
|---|---|---|---|
| C | 0–0.2% | — | — |
| Si | 0–0.8% | — | — |
| Mn | 0–1.7% | — | — |
| P | 0–0.02% | — | — |
| S | 0–0.01% | — | — |
| Cr | 0–1.5% | — | — |
| Mo | 0–0.7% | — | — |
| Ni | 0–2% | — | — |
| V | 0–0.12% | — | — |
| Ti | 0–0.05% | — | — |
| Nb | 0–0.06% | — | — |
| B | 0–0.005% | — | — |
Mechanical properties
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 770–940 | MPa |
| Yield Strength | ≥ 690 | MPa |
| Elongation | ≥ 14 | % |
| Hardness HB | 230–290 | HB |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| quenching | 880–940 °C | water | min 2 min per mm | Water quench for through-hardening |
| tempering | 550–660 °C | air | min 30 min per 25mm | Critical for 690 MPa yield + toughness balance |
| stress_relief | 530–580 °C | furnace | 1 hour per 25mm | After welding. Do NOT exceed 580C — reduces yield below 690 MPa |
Compatibility verdict
S690QL and Q690D: 93% composition match
Close equivalents but NOT identical.
Related materials
S355JR
1.0045High-strength low-alloy structural steel with minimum yield strength of 355 MPa. Standard grade for bridges, buildings, cranes, and general structural applications. Impact tested at +20°C (JR).
S275JR
1.0044Medium-strength structural steel with minimum yield strength of 275 MPa. Bridges the gap between S235JR and S355JR. Used for general structural applications, lattice towers, masts, and light crane components. Impact tested at +20°C (JR).
C10
1.0301Low-carbon unalloyed steel. Excellent weldability, good formability, and low hardness. Used for pins, rivets, bushings, case-hardened parts with thin case depth, and general cold-formed components. Can be case-hardened for surface wear resistance.
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