Steel ZG35CrMo-IH vs ZG35CrMo-SR
Steel · ZG35CrMo temper comparison
ZG35CrMo-IH and ZG35CrMo-SR are two conditions of the same steel grade, ZG35CrMo: IH (induction hardened) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. ZG35CrMo-IH is the stronger of the two: yield strength 570 MPa (82.7 ksi) against 540 MPa (78.3 ksi) for ZG35CrMo-SR, about 6% more. In exchange, ZG35CrMo-SR is the more ductile: elongation 15% versus 11% for ZG35CrMo-IH, and ZG35CrMo-IH is harder (510 HB vs 230 HB). ZG35CrMo-SR runs hotter in service (450°C vs 200°C continuous). On the shop floor, ZG35CrMo-SR machines more easily (fair vs poor) and ZG35CrMo-SR welds better (fair vs not recommended).
ZG35CrMo-IHChoose it when strength drives the design.
ZG35CrMo-SRChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
ZG35CrMo-IH vs ZG35CrMo-SR: 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 208 GPa30.2 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 165 GPa23.9 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) 1,425°C2,597 °F · Liquidus Temperature 1,490°C2,714 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 42 W/m·K24.3 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.3 µm/m·K6.8 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 13 / 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 62 / 100 · Brazeability / Solderability 45 / 100 · Polishability 50 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 2 kg CO₂/kg · Embodied Water 55 L/kg6.6 gal/lb · Typical Recycled Content 75%
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.
ZG35CrMo-IH vs ZG35CrMo-SR — frequently asked
Is ZG35CrMo-IH stronger than ZG35CrMo-SR?
Yes. ZG35CrMo-IH has a typical yield strength of 570 MPa (82.7 ksi) against 540 MPa (78.3 ksi) for ZG35CrMo-SR — about 6% more. Tensile strength is 760 MPa (110 ksi) vs 730 MPa (106 ksi).
Which condition does FabDigit quote by default, IH or SR?
Q&T is the default ZG35CrMo condition in the FabDigit quote flow (neither IH nor SR). 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, ZG35CrMo-IH or ZG35CrMo-SR?
ZG35CrMo-SR. Its machinability rates fair (48/100) against poor (15/100) for ZG35CrMo-IH; for welding the order is ZG35CrMo-SR first (fair, 45/100) then ZG35CrMo-IH (not recommended, 8/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in ZG35CrMo-IH and ZG35CrMo-SR 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.