Steel 35SiMn-A vs 35SiMn QT-28-32HRC
Steel · 35SiMn temper comparison
35SiMn-A and 35SiMn QT-28-32HRC are two conditions of the same steel grade, 35SiMn: A (solution annealed) 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 370 MPa (53.7 ksi) for 35SiMn-A, about 111% more; tensile strength follows at 950 MPa (138 ksi) vs 640 MPa (92.8 ksi). In exchange, 35SiMn-A is the more ductile: elongation 22% versus 17% for 35SiMn QT-28-32HRC, and 35SiMn QT-28-32HRC is harder (285 HB vs 200 HB). On the shop floor, 35SiMn-A machines more easily (good vs fair).
35SiMn-AChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
35SiMn QT-28-32HRCChoose it when strength drives the design.
35SiMn-A 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
Charpy V-Notch Impact (RT)
Hardness, Brinell
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 600 MPa87 ksi · Fatigue Strength (Endurance Limit) 430 MPa62.4 ksi · Fracture Toughness (K_IC) 70 MPa·√m63.7 ksi·√in · Hardness, Rockwell C 30 HRC · Hardness, Vickers 300 HV
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.
Same in both: Thermal Conductivity 40 W/m·K23.1 BTU/hr·ft·°F · 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 · Max Service Temperature (continuous) 400°C752 °F · 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 %)
Weldability
Formability (cold)
Same in both: 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-A vs 35SiMn QT-28-32HRC — frequently asked
Is 35SiMn QT-28-32HRC stronger than 35SiMn-A?
Yes. 35SiMn QT-28-32HRC has a typical yield strength of 780 MPa (113 ksi) against 370 MPa (53.7 ksi) for 35SiMn-A — about 111% more. Tensile strength is 950 MPa (138 ksi) vs 640 MPa (92.8 ksi).
Which condition does FabDigit quote by default, A or QT-28-32HRC?
QT is the default 35SiMn condition in the FabDigit quote flow (neither A 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-A or 35SiMn QT-28-32HRC?
35SiMn-A. Its machinability rates good (55/100) against fair (45/100) for 35SiMn QT-28-32HRC; for welding the order is 35SiMn-A first (fair, 35/100) then 35SiMn QT-28-32HRC (poor, 30/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 35SiMn-A 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.