Steel 18CrNi8 Annealed vs 18CrNi8-HR
Steel · 18CrNi8 temper comparison
18CrNi8 Annealed and 18CrNi8-HR are two conditions of the same steel grade, 18CrNi8: Annealed versus HR (hot rolled). The chemistry is identical, so every difference below comes from the condition. 18CrNi8-HR is the stronger of the two: yield strength 570 MPa (82.7 ksi) against 440 MPa (63.8 ksi) for 18CrNi8 Annealed, about 30% more; tensile strength follows at 870 MPa (126 ksi) vs 740 MPa (107 ksi). In exchange, 18CrNi8 Annealed is the more ductile: elongation 18% versus 13% for 18CrNi8-HR, and 18CrNi8-HR is harder (255 HB vs 205 HB). On the shop floor, 18CrNi8 Annealed welds better (fair vs poor).
18CrNi8 AnnealedChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
18CrNi8-HRChoose it when strength drives the design.
18CrNi8 Annealed vs 18CrNi8-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
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 165 GPa23.9 Msi · Poisson's Ratio 0.29 · Compressive Strength 590 MPa85.6 ksi · Shear Strength 530 MPa76.9 ksi · Fatigue Strength (Endurance Limit) 390 MPa56.6 ksi · Fracture Toughness (K_IC) 70 MPa·√m63.7 ksi·√in · Hardness, Rockwell C 25 HRC · Hardness, Vickers 268 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 34 W/m·K19.6 BTU/hr·ft·°F · Specific Heat Capacity 465 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.6 µm/m·K6.4 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 200°C392 °F · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 6.9 % IACS · Electrical Resistivity 2.5×10⁻⁷ Ω·m9.84 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: 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) 33 MJ/kg14,187 BTU/lb · Embodied Carbon (primary production) 2.3 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.
18CrNi8 Annealed vs 18CrNi8-HR — frequently asked
Is 18CrNi8-HR stronger than 18CrNi8 Annealed?
Yes. 18CrNi8-HR has a typical yield strength of 570 MPa (82.7 ksi) against 440 MPa (63.8 ksi) for 18CrNi8 Annealed — about 30% more. Tensile strength is 870 MPa (126 ksi) vs 740 MPa (107 ksi).
Which condition does FabDigit quote by default, Annealed or HR?
HR is the default 18CrNi8 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, 18CrNi8 Annealed or 18CrNi8-HR?
18CrNi8 Annealed, by a small margin. Both rate fair for machinability — 48/100 against 40/100 for 18CrNi8-HR; for welding the order is 18CrNi8 Annealed first (fair, 40/100) then 18CrNi8-HR (poor, 30/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 18CrNi8 Annealed and 18CrNi8-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.