Tungsten Alloy Class 1 Tungsten-CW vs Class 1 Tungsten-SR
Tungsten Alloy · Class 1 Tungsten temper comparison
Class 1 Tungsten-CW and Class 1 Tungsten-SR are two conditions of the same tungsten alloy grade, Class 1 Tungsten: CW (cold worked) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. Class 1 Tungsten-CW is the stronger of the two: yield strength 950 MPa (138 ksi) against 590 MPa (85.6 ksi) for Class 1 Tungsten-SR, about 61% more; tensile strength follows at 1,200 MPa (174 ksi) vs 800 MPa (116 ksi). In exchange, Class 1 Tungsten-SR is the more ductile: elongation 2% versus 1% for Class 1 Tungsten-CW, and Class 1 Tungsten-CW is harder (47 HRC vs 40 HRC). Class 1 Tungsten-SR runs hotter in service (500°C vs 400°C continuous).
Class 1 Tungsten-CWChoose it when strength drives the design.
Class 1 Tungsten-SRChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Class 1 Tungsten-CW vs Class 1 Tungsten-SR: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all tungsten alloy 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 tungsten alloy 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.
Class 1 Tungsten-CWClass 1 Tungsten-SR
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 405 GPa58.7 Msi · Shear Modulus 158 GPa22.9 Msi · Bulk Modulus 310 GPa45 Msi · Poisson's Ratio 0.28 · Reduction in Area 3% · Compressive Strength 1,500 MPa218 ksi · Shear Strength 480 MPa69.6 ksi · Fatigue Strength (Endurance Limit) 300 MPa43.5 ksi · Fracture Toughness (K_IC) 12 MPa·√m10.9 ksi·√in · Charpy V-Notch Impact (RT) 4 J3 ft·lbf · Hardness, Brinell 350 HB
Physical
Density and transition temperatures.
Same in both: Density 19.25 g/cm³0.7 lb/in³ · Melting Point (Solidus) 3,422°C6,192 °F · Liquidus Temperature 3,422°C6,192 °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 132 J/kg·K0.03 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 4.5 µm/m·K2.5 µin/in·°F · Latent Heat of Fusion 193 J/g83 BTU/lb · Min Service Temperature 20°C68 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Same in both: Electrical Resistivity 5.6×10⁻⁸ Ω·m2.2 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.05 V · Corrosion Resistance 68 / 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 %) 10% · Weldability 12 / 100 · Castability 3 / 100 · Brazeability / Solderability 62 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 400 MJ/kg171,969 BTU/lb · Embodied Carbon (primary production) 27 kg CO₂/kg · Embodied Water 260 L/kg31.2 gal/lb · Typical Recycled Content 30%
Strength versus weight
Yield strength against density for every tungsten alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Class 1 Tungsten-CW vs Class 1 Tungsten-SR — frequently asked
Is Class 1 Tungsten-CW stronger than Class 1 Tungsten-SR?
Yes. Class 1 Tungsten-CW has a typical yield strength of 950 MPa (138 ksi) against 590 MPa (85.6 ksi) for Class 1 Tungsten-SR — about 61% more. Tensile strength is 1,200 MPa (174 ksi) vs 800 MPa (116 ksi).
Which condition does FabDigit quote by default, CW or SR?
SR is the default Class 1 Tungsten 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.
When should I choose Class 1 Tungsten-CW over Class 1 Tungsten-SR?
Pick Class 1 Tungsten-CW when strength drives the design. Pick Class 1 Tungsten-SR when the part is bent, formed or impact-loaded, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Class 1 Tungsten-CW and Class 1 Tungsten-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.