Steel A536 100-70-03 Q&T vs A536 100-70-03-SR
Steel · A536 100-70-03 temper comparison
A536 100-70-03 Q&T and A536 100-70-03-SR are two conditions of the same steel grade, A536 100-70-03: Q&T (quenched and tempered) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. A536 100-70-03 Q&T is the stronger of the two: yield strength 620 MPa (89.9 ksi) against 505 MPa (73.2 ksi) for A536 100-70-03-SR, about 23% more; tensile strength follows at 860 MPa (125 ksi) vs 730 MPa (106 ksi). In exchange, A536 100-70-03-SR is the more ductile: elongation 5% versus 3% for A536 100-70-03 Q&T, and A536 100-70-03 Q&T is harder (285 HB vs 235 HB). On the shop floor, A536 100-70-03-SR machines more easily (good vs fair).
A536 100-70-03 Q&TChoose it when strength drives the design.
A536 100-70-03-SRChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
A536 100-70-03 Q&T vs A536 100-70-03-SR: 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.
A536 100-70-03 Q&TA536 100-70-03-SR
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)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 169 GPa24.5 Msi · Shear Modulus 65 GPa9.4 Msi · Bulk Modulus 130 GPa18.9 Msi · Poisson's Ratio 0.28
Physical
Density and transition temperatures.
Same in both: Density 7.1 g/cm³0.26 lb/in³ · Melting Point (Solidus) 1,150°C2,102 °F · Liquidus Temperature 1,165°C2,129 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 32 W/m·K18.5 BTU/hr·ft·°F · Specific Heat Capacity 460 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 220 J/g94.6 BTU/lb · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.9 % IACS · Electrical Resistivity 6×10⁻⁷ Ω·m23.6 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 V · Corrosion Resistance 15 / 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 85 / 100 · Brazeability / Solderability 40 / 100 · Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 20 MJ/kg8,598 BTU/lb · Embodied Carbon (primary production) 1.7 kg CO₂/kg · Embodied Water 40 L/kg4.8 gal/lb · Typical Recycled Content 85%
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.
A536 100-70-03 Q&T vs A536 100-70-03-SR — frequently asked
Is A536 100-70-03 Q&T stronger than A536 100-70-03-SR?
Yes. A536 100-70-03 Q&T has a typical yield strength of 620 MPa (89.9 ksi) against 505 MPa (73.2 ksi) for A536 100-70-03-SR — about 23% more. Tensile strength is 860 MPa (125 ksi) vs 730 MPa (106 ksi).
Which condition does FabDigit quote by default, Q&T or SR?
AS-CAST is the default A536 100-70-03 condition in the FabDigit quote flow (neither Q&T nor SR). 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, A536 100-70-03 Q&T or A536 100-70-03-SR?
A536 100-70-03-SR. Its machinability rates good (58/100) against fair (42/100) for A536 100-70-03 Q&T.
Ready to make it?
Upload a CAD file and FabDigit prices the part in A536 100-70-03 Q&T and A536 100-70-03-SR 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.