Refractory Metal R05400-O vs R05400-SR
Refractory Metal · R05400 temper comparison
R05400-O and R05400-SR are two conditions of the same refractory metal grade, R05400: O (annealed) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. R05400-SR is the stronger of the two: yield strength 310 MPa (45 ksi) against 170 MPa (24.7 ksi) for R05400-O, about 82% more; tensile strength follows at 400 MPa (58 ksi) vs 250 MPa (36.3 ksi). In exchange, R05400-O is the more ductile: elongation 35% versus 15% for R05400-SR, and R05400-SR is harder (140 HB vs 90 HB).
R05400-OChoose it when the part is bent, formed or impact-loaded.
R05400-SRChoose it when strength drives the design.
R05400-O vs R05400-SR: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all refractory metal 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 refractory metal 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)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 186 GPa27 Msi · Shear Modulus 69 GPa10 Msi · Bulk Modulus 200 GPa29 Msi · Poisson's Ratio 0.35 · Fracture Toughness (K_IC) 100 MPa·√m91 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 16.6 g/cm³0.6 lb/in³ · Melting Point (Solidus) 3,017°C5,463 °F · Liquidus Temperature 3,017°C5,463 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 57 W/m·K32.9 BTU/hr·ft·°F · Specific Heat Capacity 140 J/kg·K0.03 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 6.5 µm/m·K3.6 µin/in·°F · Latent Heat of Fusion 200 J/g86 BTU/lb · Min Service Temperature -269°C-452 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.15 V · Corrosion Resistance 98 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 20% · Castability 10 / 100 · Brazeability / Solderability 55 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 4,000 MJ/kg1,719,692 BTU/lb · Embodied Carbon (primary production) 250 kg CO₂/kg · Embodied Water 900 L/kg108 gal/lb · Typical Recycled Content 30%
Strength versus weight
Yield strength against density for every refractory metal grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
R05400-O vs R05400-SR — frequently asked
Is R05400-SR stronger than R05400-O?
Yes. R05400-SR has a typical yield strength of 310 MPa (45 ksi) against 170 MPa (24.7 ksi) for R05400-O — about 82% more. Tensile strength is 400 MPa (58 ksi) vs 250 MPa (36.3 ksi).
Which condition does FabDigit quote by default, O or SR?
O is the default R05400 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, R05400-O or R05400-SR?
R05400-SR, by a small margin. Both rate poor for machinability — 28/100 against 22/100 for R05400-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in R05400-O and R05400-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.