Steel A516 Gr 70-HR vs A516 Gr 70 Q&T
Steel · A516 Gr 70 temper comparison
A516 Gr 70-HR and A516 Gr 70 Q&T are two conditions of the same steel grade, A516 Gr 70: HR (hot rolled) versus Q&T (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. A516 Gr 70 Q&T is the stronger of the two: yield strength 400 MPa (58 ksi) against 320 MPa (46.4 ksi) for A516 Gr 70-HR, about 25% more; tensile strength follows at 590 MPa (85.6 ksi) vs 550 MPa (79.8 ksi). A516 Gr 70 Q&T is harder — 180 HB against 150 HB for A516 Gr 70-HR — which matters for wear surfaces and threads.
A516 Gr 70 Q&TChoose it when strength drives the design, or when surface hardness matters.
A516 Gr 70-HR vs A516 Gr 70 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)
Elongation at Break
Reduction in Area
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 200 GPa29 Msi · Shear Modulus 79 GPa11.5 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 320 MPa46.4 ksi · Shear Strength 350 MPa50.8 ksi
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 1,510°C2,750 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Thermal Conductivity 52 W/m·K30 BTU/hr·ft·°F · Specific Heat Capacity 470 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 247 J/g106 BTU/lb
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 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: Brazeability / Solderability 70 / 100 · Polishability 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 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.
A516 Gr 70-HR vs A516 Gr 70 Q&T — frequently asked
Is A516 Gr 70 Q&T stronger than A516 Gr 70-HR?
Yes. A516 Gr 70 Q&T has a typical yield strength of 400 MPa (58 ksi) against 320 MPa (46.4 ksi) for A516 Gr 70-HR — about 25% more. Tensile strength is 590 MPa (85.6 ksi) vs 550 MPa (79.8 ksi).
Which condition does FabDigit quote by default, HR or Q&T?
HR is the default A516 Gr 70 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 is easier to machine, A516 Gr 70-HR or A516 Gr 70 Q&T?
A516 Gr 70-HR, by a small margin. Both rate good for machinability — 62/100 against 55/100 for A516 Gr 70 Q&T; for welding the order is A516 Gr 70-HR first (excellent, 90/100) then A516 Gr 70 Q&T (excellent, 85/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in A516 Gr 70-HR and A516 Gr 70 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.