Steel 35SiMn-CD vs 35SiMn QT-28-32HRC
Steel · 35SiMn temper comparison
35SiMn-CD and 35SiMn QT-28-32HRC are two conditions of the same steel grade, 35SiMn: CD (cold drawn) versus QT-28-32HRC. The chemistry is identical, so every difference below comes from the condition. 35SiMn QT-28-32HRC is the stronger of the two: yield strength 780 MPa (113 ksi) against 650 MPa (94.3 ksi) for 35SiMn-CD, about 20% more; tensile strength follows at 950 MPa (138 ksi) vs 800 MPa (116 ksi). 35SiMn QT-28-32HRC is the more ductile: elongation 17% versus 10% for 35SiMn-CD, and 35SiMn QT-28-32HRC is harder (285 HB vs 240 HB). 35SiMn QT-28-32HRC runs hotter in service (400°C vs 300°C continuous).
35SiMn QT-28-32HRCChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
35SiMn-CD vs 35SiMn QT-28-32HRC: 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
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 470 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 250 J/g107 BTU/lb · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 6 % IACS · Electrical Resistivity 2.9×10⁻⁷ Ω·m11.4 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.62 V · Corrosion Resistance 11 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 30 / 100 · Castability 30 / 100 · Brazeability / Solderability 55 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 26 MJ/kg11,178 BTU/lb · Embodied Carbon (primary production) 2.1 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.
35SiMn-CD vs 35SiMn QT-28-32HRC — frequently asked
Is 35SiMn QT-28-32HRC stronger than 35SiMn-CD?
Yes. 35SiMn QT-28-32HRC has a typical yield strength of 780 MPa (113 ksi) against 650 MPa (94.3 ksi) for 35SiMn-CD — about 20% more. Tensile strength is 950 MPa (138 ksi) vs 800 MPa (116 ksi).
Which condition does FabDigit quote by default, CD or QT-28-32HRC?
QT is the default 35SiMn condition in the FabDigit quote flow (neither CD nor QT-28-32HRC). 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, 35SiMn-CD or 35SiMn QT-28-32HRC?
35SiMn-CD, by a small margin. Both rate fair for machinability — 52/100 against 45/100 for 35SiMn QT-28-32HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 35SiMn-CD and 35SiMn QT-28-32HRC 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.