S690QL
Quenched and tempered plate: 690 MPa yield up to 50 mm, 770–940 MPa tensile, 30 J at −40 °C — about twice S355.
For cranes, mobile machines, booms and heavily loaded bridge parts where weight matters. Q is tested at −20 °C, QL at −40 °C, QL1 at −60 °C. Weld with controlled heat input; hot forming above 560 °C spoils the temper.
- Yield strength ReH
- ≥ 690 MPa1guaranteed minimum
- Tensile strength Rm
- 770–940 MPa1guaranteed range
- Elongation after fracture A
- ≥ 14 %2guaranteed minimum
- Impact energy (Charpy V) KV
- —
How we know these values · 8 values from 4 sources
- Corroborated
- 2
- Single source
- 4
- Trade sources only
- 2
- Click any value under “All values” to see the sources that state it, with dates.
- 2 of 8 values (composition limits included) rest only on trade sources or none: a lead, not a reference.
- 1 grades in other standards are listed as equivalent; 1 match closely. See which
- How we rate evidence
What to watch
- Guaranteed yield strength depends on thickness: 690 MPa for 3–50 mm, down to 630 MPa for 100–200 mm.
- Not yet sourced: A second source for the 50–100 mm values; Design rules: EN 1993-1-12.
All values
- Identity and composition not yet
- Mechanical 8
- Design values not yet
- Physical not yet
- Thermal not yet
- Fire not yet
- Chemical and durability not yet
Mechanical
Strength
Yield strength ReH
Upper yield strength guaranteed by the product standard (minimum).
| Condition | Value | Evidence |
|---|---|---|
| ≥ 690MPa | Single source | |
| ≥ 650MPa | Trade sources only | |
| ≥ 630MPa | Single source |
Tensile strength Rm
Ultimate tensile strength. Product standards give a range or a minimum.
| Condition | Value | Evidence |
|---|---|---|
| 770–940MPa | Single source | |
| 760–930MPa | Trade sources only | |
| 710–900MPa | Single source |
Ductility
Elongation after fracture A
Minimum elongation; depends on gauge length and test direction.
| Condition | Value | Evidence |
|---|---|---|
| ≥ 14% | Corroborated |
Toughness
Impact energy (Charpy V) KV
Minimum absorbed energy at the stated test temperature.
| Condition | Value | Evidence |
|---|---|---|
| ≥ 30J | Corroborated |
S690QL in other standards
Full comparison“Equivalent” tables online usually match grades by name. This one compares the values each standard actually guarantees, so a 30 MPa gap in yield is visible before it is in your calculation.
| Grade | Standard | Min. yield at 10 mm | Tensile at 10 mm | Match | What differs |
|---|---|---|---|---|---|
| S690QL |  EN 10025-6 | ≥ 690MPa1 | 770–940MPa1 | — | Reference grade. |
| A514 Grade Q |  ASTM A514/A514M | ≥ 690MPa1 | 760–895MPa1 | Close match | Same 690 MPa (100 ksi) minimum up to 2.5 in, but A514 has no standard impact test and its 90 ksi step comes at 63.5 mm, not 50 mm. |
Compare side by side
With any other gradeSources here are public pages that reproduce EN 10025-6. For design and acceptance, the standard edition named in your specification and the inspection certificate (EN 10204 3.1) of the delivered product take precedence. Design factors are recommended values; your National Annex may set others.