Steel 11SMn30-CD vs 11SMn30-HR
Steel · 11SMn30 temper comparison
11SMn30-CD and 11SMn30-HR are two conditions of the same steel grade, 11SMn30: CD (cold drawn) versus HR (hot rolled). The chemistry is identical, so every difference below comes from the condition. 11SMn30-CD is the stronger of the two: yield strength 420 MPa (60.9 ksi) against 250 MPa (36.3 ksi) for 11SMn30-HR, about 68% more; tensile strength follows at 560 MPa (81.2 ksi) vs 420 MPa (60.9 ksi). In exchange, 11SMn30-HR is the more ductile: elongation 22% versus 10% for 11SMn30-CD, and 11SMn30-CD is harder (170 HB vs 125 HB). On the shop floor, 11SMn30-CD machines more easily (excellent vs very good).
11SMn30-CDChoose it when strength drives the design, or when the part is machined in volume.
11SMn30-HRChoose it when the part is bent, formed or impact-loaded.
11SMn30-CD vs 11SMn30-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
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 420 MPa60.9 ksi · Hardness, Vickers 178 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 1,495°C2,723 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 50 W/m·K28.9 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.7 µm/m·K6.5 µin/in·°F · Latent Heat of Fusion 247 J/g106 BTU/lb · Max Service Temperature (continuous) 300°C572 °F · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 10.5 % IACS · Electrical Resistivity 1.6×10⁻⁷ Ω·m6.3 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 8 / 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 12 / 100 · Brazeability / Solderability 50 / 100 · Polishability 30 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 1.9 kg CO₂/kg · Embodied Water 50 L/kg6 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.
11SMn30-CD vs 11SMn30-HR — frequently asked
Is 11SMn30-CD stronger than 11SMn30-HR?
Yes. 11SMn30-CD has a typical yield strength of 420 MPa (60.9 ksi) against 250 MPa (36.3 ksi) for 11SMn30-HR — about 68% more. Tensile strength is 560 MPa (81.2 ksi) vs 420 MPa (60.9 ksi).
Which condition does FabDigit quote by default, CD or HR?
HR is the default 11SMn30 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, 11SMn30-CD or 11SMn30-HR?
11SMn30-CD. Its machinability rates excellent (92/100) against very good (82/100) for 11SMn30-HR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 11SMn30-CD and 11SMn30-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.