Tungsten Alloy Class 1 Tungsten SINT vs Class 1 Tungsten-SR
Tungsten Alloy · Class 1 Tungsten temper comparison
Class 1 Tungsten SINT and Class 1 Tungsten-SR are two conditions of the same tungsten alloy grade, Class 1 Tungsten: SINT (sintered) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. Class 1 Tungsten-SR is the stronger of the two: tensile strength 800 MPa (116 ksi) against 150 MPa (21.8 ksi) for Class 1 Tungsten SINT, about 5.3 times as much. Class 1 Tungsten-SR is the more ductile: elongation 2% versus 0% for Class 1 Tungsten SINT, and Class 1 Tungsten-SR is harder (350 HB vs 280 HB). Class 1 Tungsten SINT is lighter (18 g/cm³ vs 19.25 g/cm³ for Class 1 Tungsten-SR) and Class 1 Tungsten-SR is stiffer (405 GPa vs 330 GPa).
Class 1 Tungsten SINTChoose it when weight is the constraint.
Class 1 Tungsten-SRChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
Class 1 Tungsten SINT 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 SINTClass 1 Tungsten-SR
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Elongation at Break
Hardness, Brinell
Hardness, Vickers
Same in both: Shear Modulus 158 GPa22.9 Msi · Bulk Modulus 310 GPa45 Msi · Poisson's Ratio 0.28 · Yield Strength (0.2% offset) 590 MPa85.6 ksi · 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, Rockwell C 40 HRC
Physical
Density and transition temperatures.
Density
Same in both: 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
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 · Max Service Temperature (continuous) 500°C932 °F · 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
Same in both: Machinability Rating (AISI 1212 = 100 %) 10% · Weldability 12 / 100 · Formability (cold) 8 / 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 SINT vs Class 1 Tungsten-SR — frequently asked
Is Class 1 Tungsten-SR stronger than Class 1 Tungsten SINT?
Yes. Class 1 Tungsten-SR has a typical tensile strength of 800 MPa (116 ksi) against 150 MPa (21.8 ksi) for Class 1 Tungsten SINT — about 5.3 times as much.
Which condition does FabDigit quote by default, SINT 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 SINT over Class 1 Tungsten-SR?
Pick Class 1 Tungsten SINT when weight is the constraint. Pick Class 1 Tungsten-SR when strength drives the design, or when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Class 1 Tungsten SINT 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.