Steel 1536-HR vs 1536 QT-25-30HRC
Steel · 1536 temper comparison
1536-HR and 1536 QT-25-30HRC are two conditions of the same steel grade, 1536: HR (hot rolled) versus QT-25-30HRC. The chemistry is identical, so every difference below comes from the condition. 1536 QT-25-30HRC is the stronger of the two: yield strength 700 MPa (102 ksi) against 330 MPa (47.9 ksi) for 1536-HR, about 112% more; tensile strength follows at 860 MPa (125 ksi) vs 600 MPa (87 ksi). 1536 QT-25-30HRC is harder — 262 HB against 170 HB for 1536-HR — which matters for wear surfaces and threads. On the shop floor, 1536-HR welds better (48 vs 35 out of 100) and 1536-HR forms better (fair vs poor).
1536-HRChoose it when it will be welded.
1536 QT-25-30HRCChoose it when strength drives the design, or when surface hardness matters.
1536-HR vs 1536 QT-25-30HRC: 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)
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 · Compressive Strength 550 MPa79.8 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 1,495°C2,723 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 49 W/m·K28.3 BTU/hr·ft·°F · Specific Heat Capacity 475 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 247 J/g106 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 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 10 / 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 55 / 100 · Polishability 50 / 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 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.
1536-HR vs 1536 QT-25-30HRC — frequently asked
Is 1536 QT-25-30HRC stronger than 1536-HR?
Yes. 1536 QT-25-30HRC has a typical yield strength of 700 MPa (102 ksi) against 330 MPa (47.9 ksi) for 1536-HR — about 112% more. Tensile strength is 860 MPa (125 ksi) vs 600 MPa (87 ksi).
Which condition does FabDigit quote by default, HR or QT-25-30HRC?
CD is the default 1536 condition in the FabDigit quote flow (neither HR nor QT-25-30HRC). 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, 1536-HR or 1536 QT-25-30HRC?
1536-HR. Its machinability rates good (55/100) against fair (46/100) for 1536 QT-25-30HRC; for welding the order is 1536-HR first (fair, 48/100) then 1536 QT-25-30HRC (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1536-HR and 1536 QT-25-30HRC 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.