Steel 20KhN3A-HR vs 20KhN3A Q&T
Steel · 20KhN3A temper comparison
20KhN3A-HR and 20KhN3A Q&T are two conditions of the same steel grade, 20KhN3A: HR (hot rolled) versus Q&T (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. 20KhN3A Q&T is the stronger of the two: yield strength 780 MPa (113 ksi) against 520 MPa (75.4 ksi) for 20KhN3A-HR, about 50% more; tensile strength follows at 980 MPa (142 ksi) vs 820 MPa (119 ksi). In exchange, 20KhN3A-HR is the more ductile: elongation 16% versus 14% for 20KhN3A Q&T, and 20KhN3A Q&T is harder (300 HB vs 240 HB).
20KhN3A-HRChoose it when the part is bent, formed or impact-loaded.
20KhN3A Q&TChoose it when strength drives the design.
20KhN3A-HR vs 20KhN3A Q&T: 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 C
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
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) 11.8 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -60°C-76 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 2.8×10⁻⁷ Ω·m11 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 13 / 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 50 / 100 · Polishability 62 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 34 MJ/kg14,617 BTU/lb · Embodied Carbon (primary production) 2.6 kg CO₂/kg · Embodied Water 65 L/kg7.8 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.
20KhN3A-HR vs 20KhN3A Q&T — frequently asked
Is 20KhN3A Q&T stronger than 20KhN3A-HR?
Yes. 20KhN3A Q&T has a typical yield strength of 780 MPa (113 ksi) against 520 MPa (75.4 ksi) for 20KhN3A-HR — about 50% more. Tensile strength is 980 MPa (142 ksi) vs 820 MPa (119 ksi).
Which condition does FabDigit quote by default, HR or Q&T?
Q&T is the default 20KhN3A 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, 20KhN3A-HR or 20KhN3A Q&T?
20KhN3A-HR, by a small margin. Both rate fair for machinability — 48/100 against 42/100 for 20KhN3A Q&T.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 20KhN3A-HR and 20KhN3A Q&T 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.