Steel 30CrMnSi-A vs 30CrMnSi-HR
Steel · 30CrMnSi temper comparison
30CrMnSi-A and 30CrMnSi-HR are two conditions of the same steel grade, 30CrMnSi: A (solution annealed) versus HR (hot rolled). The chemistry is identical, so every difference below comes from the condition. 30CrMnSi-HR is the stronger of the two: yield strength 520 MPa (75.4 ksi) against 480 MPa (69.6 ksi) for 30CrMnSi-A, about 8% more; tensile strength follows at 850 MPa (123 ksi) vs 750 MPa (109 ksi). In exchange, 30CrMnSi-A is the more ductile: elongation 20% versus 15% for 30CrMnSi-HR, and 30CrMnSi-HR is harder (240 HB vs 210 HB). On the shop floor, 30CrMnSi-A welds better (50 vs 40 out of 100).
30CrMnSi-AChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
30CrMnSi-HRChoose it when strength drives the design.
30CrMnSi-A vs 30CrMnSi-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
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 930 MPa135 ksi · Fracture Toughness (K_IC) 65 MPa·√m59.2 ksi·√in · Hardness, Rockwell C 36 HRC · Hardness, Vickers 355 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 37 W/m·K21.4 BTU/hr·ft·°F · Specific Heat Capacity 470 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) 400°C752 °F · Min Service Temperature -70°C-94 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7 % IACS · Electrical Resistivity 2.5×10⁻⁷ Ω·m9.84 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 V · Corrosion Resistance 12 / 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: Brazeability / Solderability 55 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 34 MJ/kg14,617 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 45 L/kg5.4 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.
30CrMnSi-A vs 30CrMnSi-HR — frequently asked
Is 30CrMnSi-HR stronger than 30CrMnSi-A?
Yes. 30CrMnSi-HR has a typical yield strength of 520 MPa (75.4 ksi) against 480 MPa (69.6 ksi) for 30CrMnSi-A — about 8% more. Tensile strength is 850 MPa (123 ksi) vs 750 MPa (109 ksi).
Which condition does FabDigit quote by default, A or HR?
QT880-520 is the default 30CrMnSi condition in the FabDigit quote flow (neither A nor HR). 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, 30CrMnSi-A or 30CrMnSi-HR?
30CrMnSi-A. Its machinability rates good (55/100) against fair (50/100) for 30CrMnSi-HR; for welding the order is 30CrMnSi-A first (fair, 50/100) then 30CrMnSi-HR (fair, 40/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 30CrMnSi-A and 30CrMnSi-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.