Refractory Metal Zr 705C-ANN (Annealed)
Heat-treated state
ASTM B752 Grade 705C
Use after heavy weld repair or when dimensional stability and maximum ductility outrank peak strength.
Values for the ANN condition
Other Zr 705C tempers and conditions
Zr 705C is listed in 3 conditions; see the grade overview at Zr 705C.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ANNThis page Annealed | Use after heavy weld repair or when dimensional stability and maximum ductility outrank peak strength. | 355 | 470 | 17 | 175 HB | 3.2 % IACS |
FDefault As fabricated | Standard supply condition for pressure-containing zirconium castings; highest as-supplied strength. | 386 | 495 | 13 | 13 HRC | 3.1 % IACS |
Hot isostatic pressed | Choose when internal porosity must be closed for radiographic acceptance, fatigue duty or thin-wall pressure parts. | 395 | 510 | 16 | 13 HRC | 3.1 % IACS |
What is Zr 705C-ANN?
Zr 705C-ANN is Zr 705C heat treated to ANN — use after heavy weld repair or when dimensional stability and maximum ductility outrank peak strength. Zr 705C-ANN has a yield strength of 355 MPa (51.5 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 60% of refractory metal grades. Elongation at break is 17% and the elastic modulus is 97 GPa (14.1 Msi). Zr 705C-ANN has a density of 6.64 g/cm³ (0.24 lb/in³), lighter than 63% of refractory metal grades. It melts at 1,840°C (3,344 °F). F is the default condition FabDigit quotes; ANN is available on request or by drawing note.
Limitations
- Low stiffness — 97 GPa (14.1 Msi), worse than 91% of refractory metal grades
- Limited service temperature — 375°C (707 °F), worse than 86% of refractory metal grades
- High embodied carbon — 105 kg CO₂/kg, worse than 80% of refractory metal grades
Zr 705C-ANN properties
Typical room-temperature values for Zr 705C-ANN; 22 are specific to this condition. Other listed values are Zr 705C reference data and may not represent this condition. Bars are the position among refractory metal grades.
Physical3
Zr 705C-ANN has a density of 6.64 g/cm³ (0.24 lb/in³), lighter than 63% of refractory metal grades. It melts at 1,840°C (3,344 °F).
Mechanical17
Zr 705C-ANN has a yield strength of 355 MPa (51.5 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 60% of refractory metal grades. Elongation at break is 17% and the elastic modulus is 97 GPa (14.1 Msi).
Thermal6
Zr 705C-ANN is rated for continuous service to 375°C (707 °F). It conducts heat at 17.3 W/m·K (10 BTU/hr·ft·°F), worse than 73% of refractory metal grades. Thermal expansion is 6.3 µm/m·K (3.5 µin/in·°F).
Electrical3
Zr 705C-ANN conducts electricity at 3.2 % IACS, worse than 72% of refractory metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (93/100), better than 92% of refractory metal grades.
Sustainability4
Producing a kilogram of Zr 705C-ANN takes about 1,600 MJ of energy and emits 105 kg of CO₂ — more than 80% of refractory metal grades. Typical recycled content is 25%.
Manufacturability8
Zr 705C-ANN's machinability is poor (33/100, better than 71% of refractory metal grades); weldability very good (70/100); formability poor (22/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Zr 705C-ANN
Is Zr 705C easy to machine?
Slow speeds, heavy positive-rake carbide, flood coolant and sharp tools to avoid galling; collect chips wet — dry fines are pyrophoric.
Can Zr 705C be welded?
GTAW with high-purity argon/helium, trailing shield or chamber; keep O/N/H pickup low and weld only clean, ground surfaces — weld repair of castings is allowed by B752 with subsequent stress relief.
Can Zr 705C be formed, bent or molded?
Cast only, by vacuum/skull induction melting into rammed graphite molds; large machining allowances and generous fillets needed because of low fluidity and alpha-case surface layer.
What surface finishes work on Zr 705C?
Grit-blast then acid pickle (HNO3/HF) to remove alpha case and mold reaction layer; passive ZrO2 film gives the corrosion resistance — no plating or painting required, polishing optional.
Zr 705C chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Nbcolumbium, primary strengthener | 2 – 3 | 2.5 |
| Hfreactor-grade Hf not separated in industrial Zr | ≤ 4.5 | 2 |
| Fe+Cr | ≤ 0.2 | 0.1 |
| O | ≤ 0.18 | 0.12 |
| C | ≤ 0.05 | 0.02 |
| N | ≤ 0.03 | 0.01 |
| H | ≤ 0.01 | 0 |
| ZrZr + Hf ≥ 95.5 % min | balance | — |
Zr 705C-ANN — frequently asked
What is Zr 705C-ANN used for?
Zr 705C-ANN is typically used for high-strength cast valves, pressure-containing castings and chemical process equipment. In short: highest-strength cast zirconium; nb-alloyed casting grade; ASTM B752 pressure castings.
What is the yield strength of Zr 705C-ANN?
Zr 705C-ANN has a typical yield strength of 355 MPa (51.5 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 60% of refractory metal grades. Strength varies by condition: see the 3 listed tempers.
Is Zr 705C-ANN easy to machine?
Not especially — machinability is rated poor (33/100, better than 71% of refractory metal grades). Slow speeds, heavy positive-rake carbide, flood coolant and sharp tools to avoid galling; collect chips wet — dry fines are pyrophoric.
Can Zr 705C-ANN be welded?
Yes — weldability is rated very good (70/100). GTAW with high-purity argon/helium, trailing shield or chamber; keep O/N/H pickup low and weld only clean, ground surfaces — weld repair of castings is allowed by B752 with subsequent stress relief.
What surface finishes work on Zr 705C-ANN?
Grit-blast then acid pickle (HNO3/HF) to remove alpha case and mold reaction layer; passive ZrO2 film gives the corrosion resistance — no plating or painting required, polishing optional.
Can Zr 705C-ANN be formed, bent or molded?
Cast only, by vacuum/skull induction melting into rammed graphite molds; large machining allowances and generous fillets needed because of low fluidity and alpha-case surface layer.
What is the maximum service temperature of Zr 705C-ANN?
Zr 705C-ANN is rated for continuous use to about 375°C (707 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Zr 705C-F and Zr 705C-ANN?
F is the default condition — standard supply condition for pressure-containing zirconium castings; highest as-supplied strength. ANN: use after heavy weld repair or when dimensional stability and maximum ductility outrank peak strength. Yield strength is 386 MPa in F versus 355 MPa in ANN.
Sources
- ASTM B752 — Standard Specification for Castings, Zirconium-Base, Corrosion Resistant, for General Application — ASTM International (2020)
- ASTM B551/B551M — Zirconium and Zirconium Alloy Strip, Sheet and Plate (R60705) — ASTM International (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Zirconium and Hafnium) — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (Zirconium) — ASM International (2005)
- Zirconium Alloy 705 (R60705) technical data — ATI / Wah Chang (2018)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.