Steel 09G2S-HR vs 09G2S-QT
Steel · 09G2S temper comparison
09G2S-HR and 09G2S-QT are two conditions of the same steel grade, 09G2S: HR (hot rolled) versus QT (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. 09G2S-QT is the stronger of the two: yield strength 470 MPa (68.2 ksi) against 350 MPa (50.8 ksi) for 09G2S-HR, about 34% more; tensile strength follows at 600 MPa (87 ksi) vs 500 MPa (72.5 ksi). In exchange, 09G2S-HR is the more ductile: elongation 22% versus 19% for 09G2S-QT, and 09G2S-QT is harder (190 HB vs 150 HB). 09G2S-HR runs hotter in service (400°C vs 350°C continuous). On the shop floor, 09G2S-HR welds better (excellent vs very good).
09G2S-HRChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
09G2S-QTChoose it when strength drives the design.
09G2S-HR vs 09G2S-QT: 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)
Elongation at Break
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 206 GPa29.9 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.28 · Reduction in Area 55% · Compressive Strength 350 MPa50.8 ksi · Shear Strength 300 MPa43.5 ksi · Fracture Toughness (K_IC) 120 MPa·√m109 ksi·√in · Hardness, Vickers 158 HV
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 48 W/m·K27.7 BTU/hr·ft·°F · Specific Heat Capacity 480 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 · Min Service Temperature -70°C-94 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 8 % IACS · Electrical Resistivity 2.1×10⁻⁷ Ω·m8.27 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.62 V · Corrosion Resistance 13 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Machinability 58 / 100 · Castability 30 / 100 · Brazeability / Solderability 60 / 100 · Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 27 MJ/kg11,608 BTU/lb · Embodied Carbon (primary production) 2.2 kg CO₂/kg · Embodied Water 45 L/kg5.4 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.
09G2S-HR vs 09G2S-QT — frequently asked
Is 09G2S-QT stronger than 09G2S-HR?
Yes. 09G2S-QT has a typical yield strength of 470 MPa (68.2 ksi) against 350 MPa (50.8 ksi) for 09G2S-HR — about 34% more. Tensile strength is 600 MPa (87 ksi) vs 500 MPa (72.5 ksi).
Which condition does FabDigit quote by default, HR or QT?
HR is the default 09G2S 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, 09G2S-HR or 09G2S-QT?
09G2S-HR. Its weldability rates excellent (88/100) against very good (78/100) for 09G2S-QT.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 09G2S-HR and 09G2S-QT 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.