Steel 37CrNi3A-QT430 vs 37CrNi3A-QT500
Steel · 37CrNi3A temper comparison
37CrNi3A-QT430 and 37CrNi3A-QT500 are two conditions of the same steel grade, 37CrNi3A: QT430 (Q&T) versus QT500 (Q&T). The chemistry is identical, so every difference below comes from the condition. 37CrNi3A-QT430 is the stronger of the two: yield strength 1,350 MPa (196 ksi) against 1,030 MPa (149 ksi) for 37CrNi3A-QT500, about 31% more; tensile strength follows at 1,550 MPa (225 ksi) vs 1,180 MPa (171 ksi). In exchange, 37CrNi3A-QT500 is the more ductile: elongation 13% versus 10% for 37CrNi3A-QT430, and 37CrNi3A-QT430 is harder (450 HB vs 350 HB). 37CrNi3A-QT500 runs hotter in service (400°C vs 350°C continuous). On the shop floor, 37CrNi3A-QT500 machines more easily (fair vs poor).
37CrNi3A-QT430Choose it when strength drives the design.
37CrNi3A-QT500Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
37CrNi3A-QT430 vs 37CrNi3A-QT500: 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 C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.29 · Compressive Strength 1,050 MPa152 ksi
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 1,480°C2,696 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 35 W/m·K20.2 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.8 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -70°C-94 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 5.7 % IACS · Electrical Resistivity 3×10⁻⁷ Ω·m11.8 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 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 %)
Same in both: Weldability 25 / 100 · Formability (cold) 25 / 100 · Castability 20 / 100 · Brazeability / Solderability 40 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 36 MJ/kg15,477 BTU/lb · Embodied Carbon (primary production) 2.6 kg CO₂/kg · Embodied Water 60 L/kg7.2 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.
37CrNi3A-QT430 vs 37CrNi3A-QT500 — frequently asked
Is 37CrNi3A-QT430 stronger than 37CrNi3A-QT500?
Yes. 37CrNi3A-QT430 has a typical yield strength of 1,350 MPa (196 ksi) against 1,030 MPa (149 ksi) for 37CrNi3A-QT500 — about 31% more. Tensile strength is 1,550 MPa (225 ksi) vs 1,180 MPa (171 ksi).
Which condition does FabDigit quote by default, QT430 or QT500?
QT500 is the default 37CrNi3A 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, 37CrNi3A-QT430 or 37CrNi3A-QT500?
37CrNi3A-QT500. Its machinability rates fair (40/100) against poor (25/100) for 37CrNi3A-QT430.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 37CrNi3A-QT430 and 37CrNi3A-QT500 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.