Refractory Metal Zr 704C-F (As fabricated)
Temper · default condition
ASTM B752 Grade 704C
Standard supply condition for corrosion-service valve bodies and pump casings; meets ASTM B752 Grade 704C minima without further heat treatment.
Values for the F condition
Other Zr 704C tempers and conditions
Zr 704C is listed in 3 conditions; see the grade overview at Zr 704C.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Stress relieved | Choose when residual casting or weld-repair stresses must be removed to minimise stress-corrosion cracking risk in chloride-bearing service. | 275 | 435 | 16 | 180 HB | 2.6 % IACS |
FDefaultThis page As fabricated | Standard supply condition for corrosion-service valve bodies and pump casings; meets ASTM B752 Grade 704C minima without further heat treatment. | 300 | 450 | 13 | 190 HB | — |
Hot isostatic pressed | Specify for pressure-containing or fatigue-loaded castings where internal shrinkage porosity must be closed and property scatter reduced. | 310 | 470 | 17 | 188 HB | 2.5 % IACS |
What is Zr 704C-F?
Zr 704C-F is Zr 704C in the F temper — standard supply condition for corrosion-service valve bodies and pump casings; meets ASTM B752 Grade 704C minima without further heat treatment. Zr 704C-F has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 60% of refractory metal grades. Elongation at break is 13% and the elastic modulus is 99 GPa (14.4 Msi). Zr 704C-F has a density of 6.56 g/cm³ (0.237 lb/in³), lighter than 71% of refractory metal grades. It melts at 1,800°C (3,272 °F).
Limitations
- Poor heat conductor — 13 W/m·K (7.51 BTU/hr·ft·°F), worse than 95% of refractory metal grades
- Low electrical conductivity — 2.5 % IACS, worse than 86% of refractory metal grades
- Low stiffness — 99 GPa (14.4 Msi), worse than 79% of refractory metal grades
Zr 704C-F properties
Typical room-temperature values for Zr 704C-F; 10 are specific to this condition. Other listed values are Zr 704C reference data and may not represent this condition. Bars are the position among refractory metal grades.
Physical3
Zr 704C-F has a density of 6.56 g/cm³ (0.237 lb/in³), lighter than 71% of refractory metal grades. It melts at 1,800°C (3,272 °F).
Mechanical16
Zr 704C-F has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 60% of refractory metal grades. Elongation at break is 13% and the elastic modulus is 99 GPa (14.4 Msi).
Thermal6
Zr 704C-F is rated for continuous service to 400°C (752 °F). It conducts heat at 13 W/m·K (7.51 BTU/hr·ft·°F), worse than 95% of refractory metal grades. Thermal expansion is 6 µm/m·K (3.33 µin/in·°F).
Electrical3
Zr 704C-F conducts electricity at 2.5 % IACS, worse than 86% 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 704C-F takes about 1,200 MJ of energy and emits 75 kg of CO₂ — less than 51% of refractory metal grades. Typical recycled content is 25%.
Manufacturability8
Zr 704C-F's machinability is poor (30/100, better than 54% of refractory metal grades); weldability good (65/100); formability poor (20/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Zr 704C-F
Is Zr 704C easy to machine?
Use slow speeds, heavy positive-rake carbide tooling and flood coolant to avoid galling and work hardening; collect chips wet — fine Zr swarf is pyrophoric.
Can Zr 704C be welded?
GTAW weld repair is routine but must be done with full argon/helium shielding or in a chamber (<50 ppm O2/N2); avoid oxide, oil and hydrogen sources, then stress relieve.
Can Zr 704C be formed, bent or molded?
Vacuum or inert-gas induction melting into graphite or rammed-graphite moulds; generous risers and controlled interstitial pickup are essential, HIP optional to close porosity.
What surface finishes work on Zr 704C?
Grit blast plus nitric-hydrofluoric pickle to remove alpha case and mould reaction layer; the self-formed oxide is the working corrosion barrier — no coating or plating required.
Zr 704C 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 |
|---|---|---|
| Snsolid-solution strengthener | 1 – 2 | 1.5 |
| Fe+Crcombined iron plus chromium per ASTM B752 | 0.2 – 0.4 | 0.3 |
| Hfhafnium not removed (non-nuclear grade) | ≤ 4.5 | — |
| Ointerstitial limit; controls ductility | ≤ 0.18 | 0.12 |
| C | ≤ 0.05 | — |
| N | ≤ 0.03 | — |
| H | ≤ 0.01 | — |
| ZrZr + Hf ≥ 97.5 % typical | balance | — |
Zr 704C-F — frequently asked
What is Zr 704C-F used for?
Zr 704C-F is typically used for cast valve bodies, pump impellers and corrosion-resistant castings. In short: strongest cast Zr grade; sn-alloyed for higher yield; self-forming oxide barrier.
What is the yield strength of Zr 704C-F?
Zr 704C-F has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 60% of refractory metal grades. Strength varies by condition: see the 3 listed tempers.
Is Zr 704C-F easy to machine?
Not especially — machinability is rated poor (30/100, better than 54% of refractory metal grades). Use slow speeds, heavy positive-rake carbide tooling and flood coolant to avoid galling and work hardening; collect chips wet — fine Zr swarf is pyrophoric.
Can Zr 704C-F be welded?
Yes — weldability is rated good (65/100). GTAW weld repair is routine but must be done with full argon/helium shielding or in a chamber (<50 ppm O2/N2); avoid oxide, oil and hydrogen sources, then stress relieve.
What surface finishes work on Zr 704C-F?
Grit blast plus nitric-hydrofluoric pickle to remove alpha case and mould reaction layer; the self-formed oxide is the working corrosion barrier — no coating or plating required.
Can Zr 704C-F be formed, bent or molded?
Vacuum or inert-gas induction melting into graphite or rammed-graphite moulds; generous risers and controlled interstitial pickup are essential, HIP optional to close porosity.
What is the maximum service temperature of Zr 704C-F?
Zr 704C-F is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Zr 704C-F and Zr 704C-SR?
F is the default condition — standard supply condition for corrosion-service valve bodies and pump casings; meets ASTM B752 Grade 704C minima without further heat treatment. SR: choose when residual casting or weld-repair stresses must be removed to minimise stress-corrosion cracking risk in chloride-bearing service. Yield strength is 300 MPa in F versus 275 MPa in SR.
Sources
- ASTM B752 — Standard Specification for Castings, Zirconium-Base, Corrosion Resistant, for General Application — ASTM International (2020)
- ASTM B551/B550 — Zirconium and Zirconium Alloy Strip, Sheet, Plate, Bar and Wire (Grade R60704) — ASTM International (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys (Zirconium and Hafnium) — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (Zirconium) — ASM International (2005)
- ATI Zirconium Alloys 702/704/705 technical data — ATI Specialty Materials (2016)
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.