Steel S1100QL
EN 10025-6
S1100QL is a quenched and tempered fine-grain structural plate to EN 10025-6, offering 1150 MPa yield, 1350 MPa tensile, 10% elongation and about 400 HB (42 HRC) with guaranteed low-temperature impact toughness (QL).
Reference datasheet — S1100QL is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the QT condition
S1100QL tempers and conditions
S1100QL is supplied in 3 conditions, soft to hard. QT is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
QT + stress relieved | Choose when welded or heavily flame-cut assemblies need residual-stress reduction for dimensional stability; hold below the original tempering temperature or strength drops sharply. | 1,100 | 1,300 | 11 | 40 HRC | 7.5 % IACS |
heavy gauge (>30 up to 50 mm) | Same Q&T delivery condition in the upper thickness band, where through-hardening and mid-thickness toughness are the limiting factors — check producer thickness limits before specifying. | 1,130 | 1,300 | 10 | 41 HRC | 7.5 % IACS |
QTDefault Quenched and tempered | Standard as-rolled-and-Q&T delivery condition for all EN 10025-6 S1100QL plate; use for weight-critical booms, jibs and high-stress weldments needing -40 °C toughness. | 1,150 | 1,350 | 10 | 42 HRC | — |
What is S1100QL?
S1100QL is a quenched and tempered fine-grain structural plate to EN 10025-6, offering 1150 MPa yield, 1350 MPa tensile, 10% elongation and about 400 HB (42 HRC) with guaranteed low-temperature impact toughness (QL). It is chosen for weight-critical lifting and load-bearing weldments and is supplied as plate in QT, thick-section QT and stress-relieved QT+SR conditions. Machinability and formability are low, welding requires preheat and strict hydrogen control, maximum service temperature is 250 °C and there is no inherent corrosion resistance. S960Q is the nearest, easier-to-fabricate alternative. S1100QL has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F). S1100QL has a yield strength of 1,150 MPa (167 ksi) and a tensile strength of 1,350 MPa (196 ksi) — stronger than 94% of steel grades. Elongation at break is 10% and the elastic modulus is 210 GPa (30.5 Msi).
What is S1100QL used for?
- High-strength lifting booms
- Mobile crane telescopic sections
- Heavy-lift trailer chassis
- Concrete pump boom arms
- Lifting attachments and spreader beams
- Weight-critical structural components
Advantages
- High strength — 1,150 MPa (167 ksi), better than 94% of steel grades
Limitations
- Limited ductility — 10%, worse than 91% of steel grades
- Difficult to machine — 30/100, worse than 89% of steel grades
- Limited service temperature — 250°C (482 °F), worse than 85% of steel grades
- Poor heat conductor — 32 W/m·K (18.5 BTU/hr·ft·°F), worse than 82% of steel grades
S1100QL properties
Typical room-temperature values for S1100QL-QT; bars are the position among steel grades.
Physical3
S1100QL has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
S1100QL has a yield strength of 1,150 MPa (167 ksi) and a tensile strength of 1,350 MPa (196 ksi) — stronger than 94% of steel grades. Elongation at break is 10% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
S1100QL is rated for continuous service to 250°C (482 °F). It conducts heat at 32 W/m·K (18.5 BTU/hr·ft·°F), worse than 82% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
S1100QL conducts electricity at 7.5 % IACS, worse than 67% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of S1100QL takes about 30 MJ of energy and emits 2.3 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 20%.
Manufacturability6
S1100QL's machinability is poor (30/100, worse than 89% of steel grades); weldability good (55/100); formability poor (30/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. S1100QL is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S1100QL
Is S1100QL easy to machine?
Machine as a ~40 HRC alloy steel: rigid setups, coated carbide, reduced speed and generous feed; drilling needs sharp cobalt/carbide tooling and coolant, and cut edges from flame cutting should be removed before machining.
Can S1100QL be welded?
Weldable with low-hydrogen consumables (matching or slightly undermatching), preheat typically 100–175 °C depending on thickness/CEV, tight heat-input limits (~1.0–1.7 kJ/mm) and immediate hydrogen control to avoid HAZ softening and cold cracking.
Can S1100QL be formed, bent or molded?
Cold bendable only with large radii (min inner radius roughly 4–5×t transverse to rolling direction), full-width die support and deburred/ground edges; hot forming destroys the Q&T properties.
S1100QL chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cladle analysis max per EN 10025-6 | ≤ 0.2 | 0.16 |
| Si | ≤ 0.5 | 0.3 |
| Mn | ≤ 1.7 | 1.2 |
| PQL quality | ≤ 0.02 | 0.01 |
| SQL quality | ≤ 0.01 | 0 |
| N | ≤ 0.02 | 0.01 |
| Bhardenability booster | ≤ 0.01 | 0 |
| Cr | ≤ 1.5 | 0.6 |
| Niraised for low-temperature toughness | ≤ 2 | 1.2 |
| Mo | ≤ 0.7 | 0.5 |
| Cu | ≤ 0.5 | 0.15 |
| Nb | ≤ 0.06 | 0.03 |
| Tiprotects B from N | ≤ 0.05 | 0.02 |
| V | ≤ 0.12 | 0.05 |
| Zroptional | ≤ 0.15 | |
| FeCEV typically 0.65–0.85 depending on thickness | balance |
What surface finishes work on S1100QL?
Shot-blast and prime or paint immediately — no natural corrosion resistance; avoid acid pickling or electroplating unless followed by hydrogen bake-out because of the high strength level.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel S1100QL in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 10025-6
How much does S1100QL cost?
S1100QL is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
S1100QL — frequently asked
What is S1100QL used for?
S1100QL is typically used for high-strength lifting booms, mobile crane telescopic sections, heavy-lift trailer chassis, concrete pump boom arms, lifting attachments and spreader beams and weight-critical structural components. In short: highest standard EN Q&T plate; low-temperature toughness (QL); weight-critical structures.
What is the yield strength of S1100QL?
S1100QL has a typical yield strength of 1,150 MPa (167 ksi) and a tensile strength of 1,350 MPa (196 ksi) — stronger than 94% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is S1100QL easy to machine?
Not especially — machinability is rated poor (30/100, worse than 89% of steel grades). Machine as a ~40 HRC alloy steel: rigid setups, coated carbide, reduced speed and generous feed; drilling needs sharp cobalt/carbide tooling and coolant, and cut edges from flame cutting should be removed before machining.
Can S1100QL be welded?
Yes — weldability is rated good (55/100). Weldable with low-hydrogen consumables (matching or slightly undermatching), preheat typically 100–175 °C depending on thickness/CEV, tight heat-input limits (~1.0–1.7 kJ/mm) and immediate hydrogen control to avoid HAZ softening and cold cracking.
What surface finishes work on S1100QL?
Shot-blast and prime or paint immediately — no natural corrosion resistance; avoid acid pickling or electroplating unless followed by hydrogen bake-out because of the high strength level.
Can S1100QL be formed, bent or molded?
Cold bendable only with large radii (min inner radius roughly 4–5×t transverse to rolling direction), full-width die support and deburred/ground edges; hot forming destroys the Q&T properties.
What is the maximum service temperature of S1100QL?
S1100QL is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does S1100QL cost?
S1100QL is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- EN 10025-6: Hot rolled products of structural steels — Flat products of high yield strength structural steels in the quenched and tempered condition — CEN (2019)
- Strenx 1100 / Weldox 1100 high-strength structural plate data sheet — SSAB (2023)
- Dillimax 1100 quenched and tempered plate — Dillinger (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture — ASM International (1996)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.