Refractory Metal T-111-AC vs T-111-SR
Refractory Metal · T-111 temper comparison
T-111-AC and T-111-SR are two conditions of the same refractory metal grade, T-111: AC (spheroidize annealed) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. T-111-SR is the stronger of the two: yield strength 620 MPa (89.9 ksi) against 380 MPa (55.1 ksi) for T-111-AC, about 63% more; tensile strength follows at 720 MPa (104 ksi) vs 500 MPa (72.5 ksi). In exchange, T-111-AC is the more ductile: elongation 18% versus 15% for T-111-SR, and T-111-SR is harder (262 HB vs 208 HB). T-111-AC runs hotter in service (2,200°C vs 1,400°C continuous).
T-111-ACChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
T-111-SRChoose it when strength drives the design.
T-111-AC vs T-111-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.
Elastic (Young's) Modulus
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 B
Hardness, Rockwell C
Hardness, Vickers
Same in both: Shear Modulus 74 GPa10.7 Msi · Bulk Modulus 210 GPa30.5 Msi · Poisson's Ratio 0.35
Physical
Density and transition temperatures.
Same in both: Density 16.8 g/cm³0.61 lb/in³ · Melting Point (Solidus) 3,030°C5,486 °F · Liquidus Temperature 3,055°C5,531 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: 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 195 J/g83.8 BTU/lb · Min Service Temperature -253°C-423 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.05 V
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 30 / 100 · Brazeability / Solderability 55 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 4,400 MJ/kg1,891,661 BTU/lb · Embodied Carbon (primary production) 265 kg CO₂/kg · Typical Recycled Content 20%
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.
T-111-AC vs T-111-SR — frequently asked
Is T-111-SR stronger than T-111-AC?
Yes. T-111-SR has a typical yield strength of 620 MPa (89.9 ksi) against 380 MPa (55.1 ksi) for T-111-AC — about 63% more. Tensile strength is 720 MPa (104 ksi) vs 500 MPa (72.5 ksi).
Which condition does FabDigit quote by default, AC or SR?
Annealed is the default T-111 condition in the FabDigit quote flow (neither AC 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, T-111-AC or T-111-SR?
T-111-SR, by a small margin. Both rate poor for machinability — 28/100 against 22/100 for T-111-AC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in T-111-AC and T-111-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.