Steel 1126 QT-200HB vs 1126 QT-24-28HRC
Steel · 1126 temper comparison
1126 QT-200HB and 1126 QT-24-28HRC are two conditions of the same steel grade, 1126: QT-200HB (Q&T) versus QT-24-28HRC. The chemistry is identical, so every difference below comes from the condition. 1126 QT-24-28HRC is the stronger of the two: yield strength 620 MPa (89.9 ksi) against 480 MPa (69.6 ksi) for 1126 QT-200HB, about 29% more; tensile strength follows at 830 MPa (120 ksi) vs 690 MPa (100 ksi). In exchange, 1126 QT-200HB is the more ductile: elongation 20% versus 16% for 1126 QT-24-28HRC, and 1126 QT-24-28HRC is harder (255 HB vs 200 HB). On the shop floor, 1126 QT-200HB machines more easily (very good vs good).
1126 QT-200HBChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
1126 QT-24-28HRCChoose it when strength drives the design.
1126 QT-200HB vs 1126 QT-24-28HRC: 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) 1,420°C2,588 °F · Liquidus Temperature 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 470 J/kg·K0.11 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 · Max Service Temperature (continuous) 425°C797 °F · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 10 % IACS · Electrical Resistivity 1.7×10⁻⁷ Ω·m6.69 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 V · Corrosion Resistance 11 / 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 55 / 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 40 L/kg4.8 gal/lb · Typical Recycled Content 35%
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.
1126 QT-200HB vs 1126 QT-24-28HRC — frequently asked
Is 1126 QT-24-28HRC stronger than 1126 QT-200HB?
Yes. 1126 QT-24-28HRC has a typical yield strength of 620 MPa (89.9 ksi) against 480 MPa (69.6 ksi) for 1126 QT-200HB — about 29% more. Tensile strength is 830 MPa (120 ksi) vs 690 MPa (100 ksi).
Which condition does FabDigit quote by default, QT-200HB or QT-24-28HRC?
CD is the default 1126 condition in the FabDigit quote flow (neither QT-200HB nor QT-24-28HRC). 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, 1126 QT-200HB or 1126 QT-24-28HRC?
1126 QT-200HB. Its machinability rates very good (70/100) against good (60/100) for 1126 QT-24-28HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1126 QT-200HB and 1126 QT-24-28HRC 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.