Refractory Metal Reactor Grade Zr-ANN vs Reactor Grade Zr-HW
Refractory Metal · Reactor Grade Zr temper comparison
Reactor Grade Zr-ANN and Reactor Grade Zr-HW are two conditions of the same refractory metal grade, Reactor Grade Zr: ANN (annealed) versus HW (hot Worked). The chemistry is identical, so every difference below comes from the condition. Reactor Grade Zr-HW is the stronger of the two: yield strength 250 MPa (36.3 ksi) against 200 MPa (29 ksi) for Reactor Grade Zr-ANN, about 25% more; tensile strength follows at 380 MPa (55.1 ksi) vs 330 MPa (47.9 ksi). In exchange, Reactor Grade Zr-ANN is the more ductile: elongation 30% versus 25% for Reactor Grade Zr-HW, and Reactor Grade Zr-HW is harder (110 HB vs 95 HB).
Reactor Grade Zr-ANNChoose it when the part is bent, formed or impact-loaded.
Reactor Grade Zr-HWChoose it when strength drives the design.
Reactor Grade Zr-ANN vs Reactor Grade Zr-HW: 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.
Reactor Grade Zr-ANNReactor Grade Zr-HW
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, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 99 GPa14.4 Msi · Shear Modulus 36 GPa5.2 Msi · Bulk Modulus 91 GPa13.2 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 6.51 g/cm³0.24 lb/in³ · Melting Point (Solidus) 1,852°C3,366 °F · Liquidus Temperature 1,852°C3,366 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 22 W/m·K12.7 BTU/hr·ft·°F · Specific Heat Capacity 285 J/kg·K0.07 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 5.8 µm/m·K3.2 µin/in·°F · Latent Heat of Fusion 153 J/g65.8 BTU/lb · Max Service Temperature (continuous) 350°C662 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 4.1 % IACS · Electrical Resistivity 4.2×10⁻⁷ Ω·m16.5 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.15 V · Corrosion Resistance 88 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Weldability
Formability (cold)
Same in both: Machinability 35 / 100 · Machinability Rating (AISI 1212 = 100 %) 25% · Castability 25 / 100 · Brazeability / Solderability 25 / 100 · Polishability 60 / 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) 80 kg CO₂/kg · Embodied Water 900 L/kg108 gal/lb · Typical Recycled Content 5%
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.
Reactor Grade Zr-ANN vs Reactor Grade Zr-HW — frequently asked
Is Reactor Grade Zr-HW stronger than Reactor Grade Zr-ANN?
Yes. Reactor Grade Zr-HW has a typical yield strength of 250 MPa (36.3 ksi) against 200 MPa (29 ksi) for Reactor Grade Zr-ANN — about 25% more. Tensile strength is 380 MPa (55.1 ksi) vs 330 MPa (47.9 ksi).
Which condition does FabDigit quote by default, ANN or HW?
ANN is the default Reactor Grade Zr 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, Reactor Grade Zr-ANN or Reactor Grade Zr-HW?
Reactor Grade Zr-ANN. Its weldability rates very good (80/100) against very good (75/100) for Reactor Grade Zr-HW.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Reactor Grade Zr-ANN and Reactor Grade Zr-HW 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.