Steel 20MnMoNi4-5-A vs 20MnMoNi4-5-HR
Steel · 20MnMoNi4-5 temper comparison
20MnMoNi4-5-A and 20MnMoNi4-5-HR are two conditions of the same steel grade, 20MnMoNi4-5: A (solution annealed) versus HR (hot rolled). The chemistry is identical, so every difference below comes from the condition. 20MnMoNi4-5-HR is the stronger of the two: yield strength 390 MPa (56.6 ksi) against 330 MPa (47.9 ksi) for 20MnMoNi4-5-A, about 18% more; tensile strength follows at 620 MPa (89.9 ksi) vs 540 MPa (78.3 ksi). In exchange, 20MnMoNi4-5-A is the more ductile: elongation 27% versus 21% for 20MnMoNi4-5-HR, and 20MnMoNi4-5-HR is harder (195 HB vs 160 HB).
20MnMoNi4-5-AChoose it when the part is bent, formed or impact-loaded.
20MnMoNi4-5-HRChoose it when strength drives the design.
20MnMoNi4-5-A vs 20MnMoNi4-5-HR: 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 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 166 GPa24.1 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) 1,450°C2,642 °F · Liquidus Temperature 1,510°C2,750 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12 µm/m·K6.7 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: 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 14 / 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 30 / 100 · Brazeability / Solderability 40 / 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) 2.2 kg CO₂/kg · Embodied Water 50 L/kg6 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.
20MnMoNi4-5-A vs 20MnMoNi4-5-HR — frequently asked
Is 20MnMoNi4-5-HR stronger than 20MnMoNi4-5-A?
Yes. 20MnMoNi4-5-HR has a typical yield strength of 390 MPa (56.6 ksi) against 330 MPa (47.9 ksi) for 20MnMoNi4-5-A — about 18% more. Tensile strength is 620 MPa (89.9 ksi) vs 540 MPa (78.3 ksi).
Which condition does FabDigit quote by default, A or HR?
QT is the default 20MnMoNi4-5 condition in the FabDigit quote flow (neither A nor HR). 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, 20MnMoNi4-5-A or 20MnMoNi4-5-HR?
20MnMoNi4-5-A. Its machinability rates good (62/100) against fair (53/100) for 20MnMoNi4-5-HR; for welding the order is 20MnMoNi4-5-A first (good, 65/100) then 20MnMoNi4-5-HR (good, 60/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 20MnMoNi4-5-A and 20MnMoNi4-5-HR 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.