Refractory Metal Mo-30W-AC vs Mo-30W-SR
Refractory Metal · Mo-30W temper comparison
Mo-30W-AC and Mo-30W-SR are two conditions of the same refractory metal grade, Mo-30W: AC (spheroidize annealed) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. Mo-30W-SR is the stronger of the two: yield strength 620 MPa (89.9 ksi) against 580 MPa (84.1 ksi) for Mo-30W-AC, about 7% more; tensile strength follows at 760 MPa (110 ksi) vs 720 MPa (104 ksi). In exchange, Mo-30W-AC is the more ductile: elongation 22% versus 18% for Mo-30W-SR, and Mo-30W-SR is harder (23 HRC vs 21 HRC).
Mo-30W-ACChoose it when the part is bent, formed or impact-loaded.
Mo-30W-SRChoose it when strength drives the design.
Mo-30W-AC vs Mo-30W-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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 340 GPa49.3 Msi · Shear Modulus 131 GPa19 Msi · Bulk Modulus 285 GPa41.3 Msi · Poisson's Ratio 0.3
Physical
Density and transition temperatures.
Density
Same in both: Melting Point (Solidus) 2,740°C4,964 °F · Liquidus Temperature 2,800°C5,072 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 215 J/kg·K0.05 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 5 µm/m·K2.8 µin/in·°F · Latent Heat of Fusion 355 J/g153 BTU/lb · Max Service Temperature (continuous) 500°C932 °F · Min Service Temperature 0°C32 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 13 % IACS · Electrical Resistivity 1.3×10⁻⁷ Ω·m5.12 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.2 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 15 / 100 · Brazeability / Solderability 60 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 205 MJ/kg88,134 BTU/lb · Embodied Carbon (primary production) 13 kg CO₂/kg · Embodied Water 220 L/kg26.4 gal/lb · 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.
Mo-30W-AC vs Mo-30W-SR — frequently asked
Is Mo-30W-SR stronger than Mo-30W-AC?
Yes. Mo-30W-SR has a typical yield strength of 620 MPa (89.9 ksi) against 580 MPa (84.1 ksi) for Mo-30W-AC — about 7% more. Tensile strength is 760 MPa (110 ksi) vs 720 MPa (104 ksi).
Which condition does FabDigit quote by default, AC or SR?
SR is the default Mo-30W 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 welds better, Mo-30W-AC or Mo-30W-SR?
Mo-30W-AC. Its weldability rates poor (25/100) against poor (20/100) for Mo-30W-SR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Mo-30W-AC and Mo-30W-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.