Refractory Metal Mo-30W-CW vs Mo-30W-SR
Refractory Metal · Mo-30W temper comparison
Mo-30W-CW and Mo-30W-SR are two conditions of the same refractory metal grade, Mo-30W: CW (cold worked) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. Mo-30W-CW is the stronger of the two: yield strength 950 MPa (138 ksi) against 620 MPa (89.9 ksi) for Mo-30W-SR, about 53% more; tensile strength follows at 1,050 MPa (152 ksi) vs 760 MPa (110 ksi). In exchange, Mo-30W-SR is the more ductile: elongation 18% versus 7% for Mo-30W-CW, and Mo-30W-CW is harder (33 HRC vs 23 HRC). Mo-30W-SR runs hotter in service (500°C vs 450°C continuous).
Mo-30W-CWChoose it when strength drives the design.
Mo-30W-SRChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Mo-30W-CW 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
Fatigue Strength (Endurance Limit)
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 · Reduction in Area 30% · Compressive Strength 650 MPa94.3 ksi · Shear Strength 450 MPa65.3 ksi · Fracture Toughness (K_IC) 15 MPa·√m13.7 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 11.9 g/cm³0.43 lb/in³ · 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.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 100 W/m·K57.8 BTU/hr·ft·°F · 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 · 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).
Same in both: Galvanic Potential (seawater, vs SCE) -0.2 V · Corrosion Resistance 55 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 30% · Weldability 20 / 100 · 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-CW vs Mo-30W-SR — frequently asked
Is Mo-30W-CW stronger than Mo-30W-SR?
Yes. Mo-30W-CW has a typical yield strength of 950 MPa (138 ksi) against 620 MPa (89.9 ksi) for Mo-30W-SR — about 53% more. Tensile strength is 1,050 MPa (152 ksi) vs 760 MPa (110 ksi).
Which condition does FabDigit quote by default, CW 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 is easier to machine, Mo-30W-CW or Mo-30W-SR?
Mo-30W-SR, by a small margin. Both rate poor for machinability — 30/100 against 25/100 for Mo-30W-CW.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Mo-30W-CW 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.