Refractory Metal Zr 706 CWSR vs Zr 706-STA
Refractory Metal · Zr 706 temper comparison
Zr 706 CWSR and Zr 706-STA are two conditions of the same refractory metal grade, Zr 706: CWSR (cold worked and stress relieved) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. Zr 706-STA is the stronger of the two: yield strength 750 MPa (109 ksi) against 550 MPa (79.8 ksi) for Zr 706 CWSR, about 36% more; tensile strength follows at 900 MPa (131 ksi) vs 660 MPa (95.7 ksi). In exchange, Zr 706 CWSR is the more ductile: elongation 14% versus 10% for Zr 706-STA, and Zr 706-STA is harder (320 HV vs 240 HV). Zr 706-STA runs hotter in service (400°C vs 350°C continuous). On the shop floor, Zr 706 CWSR machines more easily (fair vs poor) and Zr 706 CWSR welds better (very good vs fair).
Zr 706 CWSRChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
Zr 706-STAChoose it when strength drives the design, or when the part sees heat.
Zr 706 CWSR vs Zr 706-STA: 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 B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 97 GPa14.1 Msi · Shear Modulus 36 GPa5.2 Msi · Bulk Modulus 92 GPa13.3 Msi · Poisson's Ratio 0.35 · Reduction in Area 40% · Compressive Strength 420 MPa60.9 ksi · Shear Strength 330 MPa47.9 ksi · Fracture Toughness (K_IC) 60 MPa·√m54.6 ksi·√in · Hardness, Brinell 180 HB
Physical
Density and transition temperatures.
Same in both: Density 6.64 g/cm³0.24 lb/in³ · Melting Point (Solidus) 1,840°C3,344 °F · Liquidus Temperature 1,860°C3,380 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 17.1 W/m·K9.9 BTU/hr·ft·°F · Specific Heat Capacity 281 J/kg·K0.07 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 6 µm/m·K3.3 µin/in·°F · Latent Heat of Fusion 155 J/g66.6 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 3.1 % IACS · Electrical Resistivity 5.5×10⁻⁷ Ω·m21.7 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.15 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 40% · Castability 25 / 100 · Brazeability / Solderability 20 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 1,300 MJ/kg558,900 BTU/lb · Embodied Carbon (primary production) 78 kg CO₂/kg · Embodied Water 500 L/kg59.9 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.
Zr 706 CWSR vs Zr 706-STA — frequently asked
Is Zr 706-STA stronger than Zr 706 CWSR?
Yes. Zr 706-STA has a typical yield strength of 750 MPa (109 ksi) against 550 MPa (79.8 ksi) for Zr 706 CWSR — about 36% more. Tensile strength is 900 MPa (131 ksi) vs 660 MPa (95.7 ksi).
Which condition does FabDigit quote by default, CWSR or STA?
Annealed is the default Zr 706 condition in the FabDigit quote flow (neither CWSR nor STA). 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, Zr 706 CWSR or Zr 706-STA?
Zr 706 CWSR. Its machinability rates fair (45/100) against poor (30/100) for Zr 706-STA; for welding the order is Zr 706 CWSR first (very good, 70/100) then Zr 706-STA (fair, 45/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Zr 706 CWSR and Zr 706-STA 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.