Refractory Metal Zr 705C-F (As fabricated)
Temper · default condition
ASTM B752 Grade 705C
Standard supply condition for pressure-containing zirconium castings; highest as-supplied strength.
Values for the F 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 |
|---|---|---|---|---|---|---|
Annealed | Use after heavy weld repair or when dimensional stability and maximum ductility outrank peak strength. | 355 | 470 | 17 | 175 HB | 3.2 % IACS |
FDefaultThis page 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-F?
Zr 705C-F is Zr 705C in the F temper — standard supply condition for pressure-containing zirconium castings; highest as-supplied strength. Zr 705C-F has a yield strength of 386 MPa (56 ksi) and a tensile strength of 495 MPa (71.8 ksi) — stronger than 60% of refractory metal grades. Elongation at break is 13% and the elastic modulus is 97 GPa (14.1 Msi). Zr 705C-F 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).
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
- Limited formability — 12/100, worse than 84% of refractory metal grades
- High embodied carbon — 105 kg CO₂/kg, worse than 80% of refractory metal grades
- Low electrical conductivity — 3.1 % IACS, worse than 78% of refractory metal grades
Zr 705C-F properties
Typical room-temperature values for Zr 705C-F; 23 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-F 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-F has a yield strength of 386 MPa (56 ksi) and a tensile strength of 495 MPa (71.8 ksi) — stronger than 60% of refractory metal grades. Elongation at break is 13% and the elastic modulus is 97 GPa (14.1 Msi).
Thermal6
Zr 705C-F is rated for continuous service to 375°C (707 °F). It conducts heat at 17.1 W/m·K (9.88 BTU/hr·ft·°F), worse than 76% of refractory metal grades. Thermal expansion is 6.3 µm/m·K (3.5 µin/in·°F).
Electrical3
Zr 705C-F conducts electricity at 3.1 % IACS, worse than 78% of refractory metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (90/100), better than 75% of refractory metal grades.
Sustainability4
Producing a kilogram of Zr 705C-F 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-F's machinability is poor (30/100, better than 54% of refractory metal grades); weldability good (62/100); formability not recommended (12/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Zr 705C-F
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-F — frequently asked
What is Zr 705C-F used for?
Zr 705C-F 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-F?
Zr 705C-F has a typical yield strength of 386 MPa (56 ksi) and a tensile strength of 495 MPa (71.8 ksi) — stronger than 60% of refractory metal grades. Strength varies by condition: see the 3 listed tempers.
Is Zr 705C-F easy to machine?
Not especially — machinability is rated poor (30/100, better than 54% 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-F be welded?
Yes — weldability is rated good (62/100). 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-F?
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-F 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-F?
Zr 705C-F 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.