Steel 17MnCr5 +A vs 17MnCr5 CARB-QT
Steel · 17MnCr5 temper comparison
17MnCr5 +A and 17MnCr5 CARB-QT are two conditions of the same steel grade, 17MnCr5: +A (annealed) versus CARB-QT (carburized, quenched and low-temperature tempered). The chemistry is identical, so every difference below comes from the condition. 17MnCr5 CARB-QT is the stronger of the two: yield strength 700 MPa (102 ksi) against 380 MPa (55.1 ksi) for 17MnCr5 +A, about 84% more; tensile strength follows at 1,000 MPa (145 ksi) vs 620 MPa (89.9 ksi). In exchange, 17MnCr5 +A is the more ductile: elongation 20% versus 10% for 17MnCr5 CARB-QT, and 17MnCr5 CARB-QT is harder (720 HV vs 190 HV). On the shop floor, 17MnCr5 +A machines more easily (good vs not recommended) and 17MnCr5 +A welds better (good vs not recommended).
17MnCr5 +AChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
17MnCr5 CARB-QTChoose it when strength drives the design.
17MnCr5 +A vs 17MnCr5 CARB-QT: 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, 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 · Shear Strength 400 MPa58 ksi · Hardness, Brinell 180 HB · Hardness, Rockwell B 88 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 44 W/m·K25.4 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.5 µm/m·K6.4 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 180°C356 °F · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 2.1×10⁻⁷ Ω·m8.27 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 12 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Same in both: Machinability Rating (AISI 1212 = 100 %) 65% · Formability (cold) 60 / 100 · Brazeability / Solderability 60 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 32 MJ/kg13,758 BTU/lb · Embodied Carbon (primary production) 2.2 kg CO₂/kg · Embodied Water 60 L/kg7.2 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.
17MnCr5 +A vs 17MnCr5 CARB-QT — frequently asked
Is 17MnCr5 CARB-QT stronger than 17MnCr5 +A?
Yes. 17MnCr5 CARB-QT has a typical yield strength of 700 MPa (102 ksi) against 380 MPa (55.1 ksi) for 17MnCr5 +A — about 84% more. Tensile strength is 1,000 MPa (145 ksi) vs 620 MPa (89.9 ksi).
Which condition does FabDigit quote by default, +A or CARB-QT?
+A is the default 17MnCr5 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, 17MnCr5 +A or 17MnCr5 CARB-QT?
17MnCr5 +A. Its machinability rates good (58/100) against not recommended (12/100) for 17MnCr5 CARB-QT; for welding the order is 17MnCr5 +A first (good, 55/100) then 17MnCr5 CARB-QT (not recommended, 10/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 17MnCr5 +A and 17MnCr5 CARB-QT 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.