Steel 4023 QT-200 vs 4023 QT-540
Steel · 4023 temper comparison
4023 QT-200 and 4023 QT-540 are two conditions of the same steel grade, 4023: QT-200 (Q&T) versus QT-540 (Q&T). The chemistry is identical, so every difference below comes from the condition. 4023 QT-200 is the stronger of the two: yield strength 520 MPa (75.4 ksi) against 450 MPa (65.3 ksi) for 4023 QT-540, about 16% more; tensile strength follows at 720 MPa (104 ksi) vs 600 MPa (87 ksi). In exchange, 4023 QT-540 is the more ductile: elongation 24% versus 17% for 4023 QT-200, and 4023 QT-200 is harder (217 HB vs 179 HB). 4023 QT-540 runs hotter in service (400°C vs 180°C continuous).
4023 QT-200Choose it when strength drives the design.
4023 QT-540Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
4023 QT-200 vs 4023 QT-540: 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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
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 · Shear Strength 360 MPa52.2 ksi · Fracture Toughness (K_IC) 95 MPa·√m86.5 ksi·√in · Hardness, Vickers 171 HV
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 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 43 W/m·K24.8 BTU/hr·ft·°F · Specific Heat Capacity 475 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.2 µm/m·K6.8 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.8 % IACS · Electrical Resistivity 2.2×10⁻⁷ Ω·m8.66 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.62 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 74 / 100 · Formability (cold) 50 / 100 · Brazeability / Solderability 60 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 30 MJ/kg12,898 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.
4023 QT-200 vs 4023 QT-540 — frequently asked
Is 4023 QT-200 stronger than 4023 QT-540?
Yes. 4023 QT-200 has a typical yield strength of 520 MPa (75.4 ksi) against 450 MPa (65.3 ksi) for 4023 QT-540 — about 16% more. Tensile strength is 720 MPa (104 ksi) vs 600 MPa (87 ksi).
Which condition does FabDigit quote by default, QT-200 or QT-540?
CD is the default 4023 condition in the FabDigit quote flow (neither QT-200 nor QT-540). 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, 4023 QT-200 or 4023 QT-540?
4023 QT-540. Its machinability rates good (57/100) against fair (50/100) for 4023 QT-200.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4023 QT-200 and 4023 QT-540 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.