Steel 1070-CR vs 1070 Q&T
Steel · 1070 temper comparison
1070-CR and 1070 Q&T are two conditions of the same steel grade, 1070: CR (cold rolled) versus Q&T (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. 1070 Q&T is the stronger of the two: yield strength 1,250 MPa (181 ksi) against 650 MPa (94.3 ksi) for 1070-CR, about 92% more; tensile strength follows at 1,400 MPa (203 ksi) vs 780 MPa (113 ksi). 1070 Q&T is harder — 405 HB against 225 HB for 1070-CR — which matters for wear surfaces and threads. 1070 Q&T runs hotter in service (350°C vs 200°C continuous). On the shop floor, 1070-CR machines more easily (fair vs poor) and 1070-CR forms better (poor vs not recommended).
1070-CRChoose it when the part is machined in volume.
1070 Q&TChoose it when strength drives the design, or when surface hardness matters.
1070-CR vs 1070 Q&T: 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)
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
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 · Elongation at Break 8% · Reduction in Area 25%
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 1,480°C2,696 °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 470 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 -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 9 % IACS · Electrical Resistivity 1.9×10⁻⁷ Ω·m7.48 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 V · Corrosion Resistance 9 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Polishability
Same in both: Brazeability / Solderability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 2.1 kg CO₂/kg · Embodied Water 45 L/kg5.4 gal/lb · Typical Recycled Content 25%
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.
1070-CR vs 1070 Q&T — frequently asked
Is 1070 Q&T stronger than 1070-CR?
Yes. 1070 Q&T has a typical yield strength of 1,250 MPa (181 ksi) against 650 MPa (94.3 ksi) for 1070-CR — about 92% more. Tensile strength is 1,400 MPa (203 ksi) vs 780 MPa (113 ksi).
Which condition does FabDigit quote by default, CR or Q&T?
HR is the default 1070 condition in the FabDigit quote flow (neither CR nor Q&T). 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, 1070-CR or 1070 Q&T?
1070-CR. Its machinability rates fair (40/100) against poor (22/100) for 1070 Q&T; for welding the order is 1070-CR first (poor, 15/100) then 1070 Q&T (not recommended, 10/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1070-CR and 1070 Q&T 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.