Steel S690QL Q&T vs S690QL Q&T t100-150
Steel · S690QL temper comparison
S690QL Q&T and S690QL Q&T t100-150 are two conditions of the same steel grade, S690QL: Q&T (quenched and tempered) versus Q&T t100-150 (Q&T). The chemistry is identical, so every difference below comes from the condition. S690QL Q&T is the stronger of the two: yield strength 760 MPa (110 ksi) against 700 MPa (102 ksi) for S690QL Q&T t100-150, about 9% more. S690QL Q&T is harder — 265 HB against 250 HB for S690QL Q&T t100-150 — which matters for wear surfaces and threads.
S690QL Q&TChoose it when strength drives the design, or when surface hardness matters.
S690QL Q&T vs S690QL Q&T t100-150: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.3 · Elongation at Break 16%
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,440°C2,624 °F · Liquidus Temperature 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 35 W/m·K20.2 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12 µm/m·K6.7 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 350°C662 °F · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.2 % IACS · Electrical Resistivity 2.4×10⁻⁷ Ω·m9.45 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.62 V · Corrosion Resistance 14 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 32 MJ/kg13,758 BTU/lb · Embodied Carbon (primary production) 2.5 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 30%
Strength versus weight
Yield strength against density for every steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
S690QL Q&T vs S690QL Q&T t100-150 — frequently asked
Is S690QL Q&T stronger than S690QL Q&T t100-150?
Yes. S690QL Q&T has a typical yield strength of 760 MPa (110 ksi) against 700 MPa (102 ksi) for S690QL Q&T t100-150 — about 9% more. Tensile strength is 830 MPa (120 ksi) vs 790 MPa (115 ksi).
Which condition does FabDigit quote by default, Q&T or Q&T t100-150?
Q&T is the default S690QL condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which welds better, S690QL Q&T or S690QL Q&T t100-150?
S690QL Q&T. Its weldability rates good (65/100) against good (60/100) for S690QL Q&T t100-150.
Ready to make it?
Upload a CAD file and FabDigit prices the part in S690QL Q&T and S690QL Q&T t100-150 side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.