Steel 1145-IH vs 1145 QT-22-26HRC
Steel · 1145 temper comparison
1145-IH and 1145 QT-22-26HRC are two conditions of the same steel grade, 1145: IH (induction hardened) versus QT-22-26HRC. The chemistry is identical, so every difference below comes from the condition. 1145 QT-22-26HRC is the stronger of the two: yield strength 690 MPa (100 ksi) against 560 MPa (81.2 ksi) for 1145-IH, about 23% more; tensile strength follows at 830 MPa (120 ksi) vs 700 MPa (102 ksi). 1145 QT-22-26HRC is the more ductile: elongation 17% versus 12% for 1145-IH, and 1145-IH is harder (600 HB vs 248 HB). 1145 QT-22-26HRC runs hotter in service (400°C vs 200°C continuous) and 1145 QT-22-26HRC conducts electricity better (10 % IACS vs 9 % IACS). On the shop floor, 1145 QT-22-26HRC machines more easily (fair vs poor) and 1145 QT-22-26HRC welds better (poor vs not recommended).
1145 QT-22-26HRCChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
1145-IH vs 1145 QT-22-26HRC: 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
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,416°C2,581 °F · Liquidus Temperature 1,495°C2,723 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 486 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.7 µm/m·K6.5 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.65 V · Corrosion Resistance 10 / 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: Brazeability / Solderability 60 / 100 · Polishability 50 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 2 kg CO₂/kg · Embodied Water 35 L/kg4.2 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.
1145-IH vs 1145 QT-22-26HRC — frequently asked
Is 1145 QT-22-26HRC stronger than 1145-IH?
Yes. 1145 QT-22-26HRC has a typical yield strength of 690 MPa (100 ksi) against 560 MPa (81.2 ksi) for 1145-IH — about 23% more. Tensile strength is 830 MPa (120 ksi) vs 700 MPa (102 ksi).
Which condition does FabDigit quote by default, IH or QT-22-26HRC?
CD is the default 1145 condition in the FabDigit quote flow (neither IH nor QT-22-26HRC). 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 is easier to machine, 1145-IH or 1145 QT-22-26HRC?
1145 QT-22-26HRC. Its machinability rates fair (52/100) against poor (15/100) for 1145-IH; for welding the order is 1145 QT-22-26HRC first (poor, 30/100) then 1145-IH (not recommended, 10/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1145-IH and 1145 QT-22-26HRC 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.