Steel 8CrMo16-5 +A vs 8CrMo16-5 +SR
Steel · 8CrMo16-5 temper comparison
8CrMo16-5 +A and 8CrMo16-5 +SR are two conditions of the same steel grade, 8CrMo16-5: +A (annealed) versus +SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. 8CrMo16-5 +SR is the stronger of the two: yield strength 580 MPa (84.1 ksi) against 380 MPa (55.1 ksi) for 8CrMo16-5 +A, about 53% more; tensile strength follows at 790 MPa (115 ksi) vs 600 MPa (87 ksi). In exchange, 8CrMo16-5 +A is the more ductile: elongation 22% versus 16% for 8CrMo16-5 +SR, and 8CrMo16-5 +SR is harder (245 HB vs 195 HB). On the shop floor, 8CrMo16-5 +A welds better (45 vs 35 out of 100).
8CrMo16-5 +AChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
8CrMo16-5 +SRChoose it when strength drives the design.
8CrMo16-5 +A vs 8CrMo16-5 +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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Fracture Toughness (K_IC) 90 MPa·√m81.9 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 7.8 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,450°C2,642 °F · Liquidus Temperature 1,500°C2,732 °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 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 · Max Service Temperature (continuous) 500°C932 °F · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 5.8 % IACS · Electrical Resistivity 3×10⁻⁷ Ω·m11.8 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 22 / 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 45 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 26 MJ/kg11,178 BTU/lb · Embodied Carbon (primary production) 2 kg CO₂/kg · Embodied Water 60 L/kg7.2 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.
8CrMo16-5 +A vs 8CrMo16-5 +SR — frequently asked
Is 8CrMo16-5 +SR stronger than 8CrMo16-5 +A?
Yes. 8CrMo16-5 +SR has a typical yield strength of 580 MPa (84.1 ksi) against 380 MPa (55.1 ksi) for 8CrMo16-5 +A — about 53% more. Tensile strength is 790 MPa (115 ksi) vs 600 MPa (87 ksi).
Which condition does FabDigit quote by default, +A or +SR?
+QT is the default 8CrMo16-5 condition in the FabDigit quote flow (neither +A 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, 8CrMo16-5 +A or 8CrMo16-5 +SR?
8CrMo16-5 +A, by a small margin. Both rate good for machinability — 65/100 against 56/100 for 8CrMo16-5 +SR; for welding the order is 8CrMo16-5 +A first (fair, 45/100) then 8CrMo16-5 +SR (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 8CrMo16-5 +A and 8CrMo16-5 +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.