Steel 6CrMnSi2Mo1V Q&T 50-52 HRC vs 6CrMnSi2Mo1V Q&T 57-59 HRC
Steel · 6CrMnSi2Mo1V temper comparison
6CrMnSi2Mo1V Q&T 50-52 HRC and 6CrMnSi2Mo1V Q&T 57-59 HRC are two conditions of the same steel grade, 6CrMnSi2Mo1V: Q&T 50-52 HRC (oil quench + temper ~380–420 °C) versus Q&T 57-59 HRC (oil quench + low temper). The chemistry is identical, so every difference below comes from the condition. 6CrMnSi2Mo1V Q&T 57-59 HRC is the stronger of the two: yield strength 1,800 MPa (261 ksi) against 1,480 MPa (215 ksi) for 6CrMnSi2Mo1V Q&T 50-52 HRC, about 22% more; tensile strength follows at 2,150 MPa (312 ksi) vs 1,750 MPa (254 ksi). In exchange, 6CrMnSi2Mo1V Q&T 50-52 HRC is the more ductile: elongation 8% versus 3% for 6CrMnSi2Mo1V Q&T 57-59 HRC, and 6CrMnSi2Mo1V Q&T 57-59 HRC is harder (653 HV vs 530 HV). 6CrMnSi2Mo1V Q&T 50-52 HRC runs hotter in service (320°C vs 150°C continuous).
6CrMnSi2Mo1V Q&T 50-52 HRCChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
6CrMnSi2Mo1V Q&T 57-59 HRCChoose it when strength drives the design.
6CrMnSi2Mo1V Q&T 50-52 HRC vs 6CrMnSi2Mo1V Q&T 57-59 HRC: 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.
6CrMnSi2Mo1V Q&T 50-52 HRC6CrMnSi2Mo1V Q&T 57-59 HRC
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Charpy V-Notch Impact (RT)
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 207 GPa30 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Hardness, Brinell 217 HB · Hardness, Rockwell B 97 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.76 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,455°C2,651 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 22 W/m·K12.7 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.4 µm/m·K6.9 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 Resistivity 6×10⁻⁷ Ω·m23.6 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
Same in both: Machinability Rating (AISI 1212 = 100 %) 55% · Weldability 20 / 100 · Formability (cold) 30 / 100 · Castability 25 / 100 · Brazeability / Solderability 35 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 36 MJ/kg15,477 BTU/lb · Embodied Carbon (primary production) 2.8 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 40%
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.
6CrMnSi2Mo1V Q&T 50-52 HRC vs 6CrMnSi2Mo1V Q&T 57-59 HRC — frequently asked
Is 6CrMnSi2Mo1V Q&T 57-59 HRC stronger than 6CrMnSi2Mo1V Q&T 50-52 HRC?
Yes. 6CrMnSi2Mo1V Q&T 57-59 HRC has a typical yield strength of 1,800 MPa (261 ksi) against 1,480 MPa (215 ksi) for 6CrMnSi2Mo1V Q&T 50-52 HRC — about 22% more. Tensile strength is 2,150 MPa (312 ksi) vs 1,750 MPa (254 ksi).
Which condition does FabDigit quote by default, Q&T 50-52 HRC or Q&T 57-59 HRC?
Annealed is the default 6CrMnSi2Mo1V condition in the FabDigit quote flow (neither Q&T 50-52 HRC nor Q&T 57-59 HRC). 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, 6CrMnSi2Mo1V Q&T 50-52 HRC or 6CrMnSi2Mo1V Q&T 57-59 HRC?
6CrMnSi2Mo1V Q&T 50-52 HRC, by a small margin. Both rate not recommended for machinability — 14/100 against 8/100 for 6CrMnSi2Mo1V Q&T 57-59 HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 6CrMnSi2Mo1V Q&T 50-52 HRC and 6CrMnSi2Mo1V Q&T 57-59 HRC 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.