Steel 1151-N vs 1151 QT-30
Steel · 1151 temper comparison
1151-N and 1151 QT-30 are two conditions of the same steel grade, 1151: N (normalized) versus QT-30 (Q&T 28–32 HRC). The chemistry is identical, so every difference below comes from the condition. 1151 QT-30 is the stronger of the two: yield strength 800 MPa (116 ksi) against 415 MPa (60.2 ksi) for 1151-N, about 93% more; tensile strength follows at 965 MPa (140 ksi) vs 720 MPa (104 ksi). In exchange, 1151-N is the more ductile: elongation 18% versus 15% for 1151 QT-30, and 1151 QT-30 is harder (293 HB vs 207 HB). On the shop floor, 1151-N machines more easily (very good vs good).
1151-NChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
1151 QT-30Choose it when strength drives the design.
1151-N vs 1151 QT-30: 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)
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 80 GPa11.6 Msi · Bulk Modulus 140 GPa20.3 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,490°C2,714 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 470 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 250 J/g107 BTU/lb · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.65 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: Castability 40 / 100 · Brazeability / Solderability 55 / 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 kg CO₂/kg · Embodied Water 50 L/kg6 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.
1151-N vs 1151 QT-30 — frequently asked
Is 1151 QT-30 stronger than 1151-N?
Yes. 1151 QT-30 has a typical yield strength of 800 MPa (116 ksi) against 415 MPa (60.2 ksi) for 1151-N — about 93% more. Tensile strength is 965 MPa (140 ksi) vs 720 MPa (104 ksi).
Which condition does FabDigit quote by default, N or QT-30?
CD is the default 1151 condition in the FabDigit quote flow (neither N nor QT-30). 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, 1151-N or 1151 QT-30?
1151-N. Its machinability rates very good (71/100) against good (55/100) for 1151 QT-30.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1151-N and 1151 QT-30 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.