Steel CrWMn-HR vs CrWMn QT57-59
Steel · CrWMn temper comparison
CrWMn-HR and CrWMn QT57-59 are two conditions of the same steel grade, CrWMn: HR (hot rolled) versus QT57-59 (Q&T 57–59 HRC). The chemistry is identical, so every difference below comes from the condition. CrWMn QT57-59 is the stronger of the two: yield strength 1,800 MPa (261 ksi) against 600 MPa (87 ksi) for CrWMn-HR, about 3.0 times as much; tensile strength follows at 2,050 MPa (297 ksi) vs 950 MPa (138 ksi). In exchange, CrWMn-HR is the more ductile: elongation 10% versus 3% for CrWMn QT57-59, and CrWMn-HR is harder (300 HB vs 229 HB). CrWMn QT57-59 runs hotter in service (220°C vs 200°C continuous). On the shop floor, CrWMn-HR machines more easily (poor vs not recommended).
CrWMn-HRChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
CrWMn QT57-59Choose it when strength drives the design, or when the part sees heat.
CrWMn-HR vs CrWMn QT57-59: 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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.29 · Charpy V-Notch Impact (RT) 14 J10.3 ft·lbf · Hardness, Rockwell B 98 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.83 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,470°C2,678 °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 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.5 µm/m·K6.4 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -30°C-22 °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) -0.6 V · Corrosion Resistance 12 / 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: Castability 20 / 100 · Brazeability / Solderability 45 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 34 MJ/kg14,617 BTU/lb · Embodied Carbon (primary production) 2.5 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 40%
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.
CrWMn-HR vs CrWMn QT57-59 — frequently asked
Is CrWMn QT57-59 stronger than CrWMn-HR?
Yes. CrWMn QT57-59 has a typical yield strength of 1,800 MPa (261 ksi) against 600 MPa (87 ksi) for CrWMn-HR — about 3.0 times as much. Tensile strength is 2,050 MPa (297 ksi) vs 950 MPa (138 ksi).
Which condition does FabDigit quote by default, HR or QT57-59?
A is the default CrWMn condition in the FabDigit quote flow (neither HR nor QT57-59). 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, CrWMn-HR or CrWMn QT57-59?
CrWMn-HR. Its machinability rates poor (28/100) against not recommended (12/100) for CrWMn QT57-59; for welding the order is CrWMn QT57-59 first (poor, 15/100) then CrWMn-HR (not recommended, 10/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in CrWMn-HR and CrWMn QT57-59 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.