Steel 9CrSi Annealed vs 9CrSi Hot Rolled
Steel · 9CrSi temper comparison
9CrSi Annealed and 9CrSi Hot Rolled are two conditions of the same steel grade, 9CrSi: Annealed versus Hot Rolled. The chemistry is identical, so every difference below comes from the condition. 9CrSi Hot Rolled is the stronger of the two: yield strength 570 MPa (82.7 ksi) against 430 MPa (62.4 ksi) for 9CrSi Annealed, about 33% more; tensile strength follows at 900 MPa (131 ksi) vs 750 MPa (109 ksi). In exchange, 9CrSi Annealed is the more ductile: elongation 15% versus 10% for 9CrSi Hot Rolled, and 9CrSi Hot Rolled is harder (280 HB vs 217 HB). 9CrSi Annealed runs hotter in service (300°C vs 200°C continuous). On the shop floor, 9CrSi Annealed machines more easily (50 vs 35 out of 100).
9CrSi AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
9CrSi Hot RolledChoose it when strength drives the design.
9CrSi Annealed vs 9CrSi Hot Rolled: 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.
9CrSi Annealed9CrSi Hot Rolled
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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
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 · Hardness, Rockwell B 96 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.77 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,480°C2,696 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 34 W/m·K19.6 BTU/hr·ft·°F · Specific Heat Capacity 460 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 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °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) -0.6 V · 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 20 / 100 · Brazeability / Solderability 45 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 33 MJ/kg14,187 BTU/lb · Embodied Carbon (primary production) 2.4 kg CO₂/kg · Embodied Water 55 L/kg6.6 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.
9CrSi Annealed vs 9CrSi Hot Rolled — frequently asked
Is 9CrSi Hot Rolled stronger than 9CrSi Annealed?
Yes. 9CrSi Hot Rolled has a typical yield strength of 570 MPa (82.7 ksi) against 430 MPa (62.4 ksi) for 9CrSi Annealed — about 33% more. Tensile strength is 900 MPa (131 ksi) vs 750 MPa (109 ksi).
Which condition does FabDigit quote by default, Annealed or Hot Rolled?
Annealed is the default 9CrSi 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, 9CrSi Annealed or 9CrSi Hot Rolled?
9CrSi Annealed, by a small margin. Both rate fair for machinability — 50/100 against 35/100 for 9CrSi Hot Rolled; for welding the order is 9CrSi Annealed first (poor, 15/100) then 9CrSi Hot Rolled (not recommended, 10/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 9CrSi Annealed and 9CrSi Hot Rolled 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.