Steel 20MnB QT-28-32HRC vs 20MnB-QT200
Steel · 20MnB temper comparison
20MnB QT-28-32HRC and 20MnB-QT200 are two conditions of the same steel grade, 20MnB: QT-28-32HRC versus QT200 (quenched 860 °C + tempered 200 °C). The chemistry is identical, so every difference below comes from the condition. 20MnB-QT200 is the stronger of the two: yield strength 950 MPa (138 ksi) against 780 MPa (113 ksi) for 20MnB QT-28-32HRC, about 22% more; tensile strength follows at 1,150 MPa (167 ksi) vs 950 MPa (138 ksi). In exchange, 20MnB QT-28-32HRC is the more ductile: elongation 16% versus 12% for 20MnB-QT200, and 20MnB-QT200 is harder (355 HB vs 290 HB). 20MnB QT-28-32HRC runs hotter in service (400°C vs 180°C continuous). On the shop floor, 20MnB QT-28-32HRC machines more easily (fair vs poor) and 20MnB QT-28-32HRC welds better (good vs fair).
20MnB QT-28-32HRCChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
20MnB-QT200Choose it when strength drives the design.
20MnB QT-28-32HRC vs 20MnB-QT200: 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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 400 MPa58 ksi · Fracture Toughness (K_IC) 90 MPa·√m81.9 ksi·√in · Hardness, Rockwell B 88 HRB
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 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 45 W/m·K26 BTU/hr·ft·°F · Specific Heat Capacity 470 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 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 10 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Same in both: Formability (cold) 65 / 100 · Brazeability / Solderability 65 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 1.9 kg CO₂/kg · Embodied Water 45 L/kg5.4 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.
20MnB QT-28-32HRC vs 20MnB-QT200 — frequently asked
Is 20MnB-QT200 stronger than 20MnB QT-28-32HRC?
Yes. 20MnB-QT200 has a typical yield strength of 950 MPa (138 ksi) against 780 MPa (113 ksi) for 20MnB QT-28-32HRC — about 22% more. Tensile strength is 1,150 MPa (167 ksi) vs 950 MPa (138 ksi).
Which condition does FabDigit quote by default, QT-28-32HRC or QT200?
HR is the default 20MnB condition in the FabDigit quote flow (neither QT-28-32HRC nor QT200). 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, 20MnB QT-28-32HRC or 20MnB-QT200?
20MnB QT-28-32HRC. Its machinability rates fair (46/100) against poor (32/100) for 20MnB-QT200; for welding the order is 20MnB QT-28-32HRC first (good, 62/100) then 20MnB-QT200 (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 20MnB QT-28-32HRC and 20MnB-QT200 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.