Refractory Metal Zr 700-HW (Hot worked / as-forged)
Heat-treated state
UNS R60700 · ASTM B550/B551 Grade 700
Use for heavy plate, forged blocks and flanges supplied hot worked without a final full anneal; slightly higher strength, coarser surface.
Values for the HW condition
Other Zr 700 tempers and conditions
Zr 700 is listed in 4 conditions; see the grade overview at Zr 700.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault recrystallization annealed (mill anneal) | Standard stocked condition for plate, sheet, strip, bar and forgings; maximum ductility for forming, bending and welding. | 190 | 330 | 32 | 120 HB | — |
HWThis page Hot worked / as-forged | Use for heavy plate, forged blocks and flanges supplied hot worked without a final full anneal; slightly higher strength, coarser surface. | 230 | 360 | 26 | 135 HB | 4.3 % IACS |
cold worked and stress relieved | Pick for bar, wire and tube needing higher yield strength and dimensional stability while retaining useful ductility. | 350 | 450 | 18 | 160 HB | — |
Cold worked | Highest strength and springback for thin strip, foil and drawn wire where no further forming is required. | 440 | 520 | 10 | 185 HB | — |
What is Zr 700-HW?
Zr 700-HW is Zr 700 heat treated to HW — use for heavy plate, forged blocks and flanges supplied hot worked without a final full anneal; slightly higher strength, coarser surface. Zr 700-HW has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 79% of refractory metal grades. Elongation at break is 26% and the elastic modulus is 99 GPa (14.4 Msi). Zr 700-HW has a density of 6.51 g/cm³ (0.235 lb/in³), lighter than 84% of refractory metal grades. It melts at 1,852°C (3,366 °F). Annealed is the default condition FabDigit quotes; HW is available on request or by drawing note.
Advantages
- Lightweight — 6.51 g/cm³ (0.235 lb/in³), better than 84% of refractory metal grades
- Tough — resists crack growth — 65 MPa·√m (59.2 ksi·√in), better than 80% of refractory metal grades
- Ductile — tolerates forming and impact — 26%, better than 77% of refractory metal grades
Limitations
- Limited service temperature — 350°C (662 °F), worse than 89% of refractory metal grades
- Low strength — 230 MPa (33.4 ksi), worse than 79% of refractory metal grades
- Low stiffness — 99 GPa (14.4 Msi), worse than 79% of refractory metal grades
Zr 700-HW properties
Typical room-temperature values for Zr 700-HW; 22 are specific to this condition. Other listed values are Zr 700 reference data and may not represent this condition. Bars are the position among refractory metal grades.
Physical3
Zr 700-HW has a density of 6.51 g/cm³ (0.235 lb/in³), lighter than 84% of refractory metal grades. It melts at 1,852°C (3,366 °F).
Mechanical16
Zr 700-HW has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 79% of refractory metal grades. Elongation at break is 26% and the elastic modulus is 99 GPa (14.4 Msi).
Thermal6
Zr 700-HW is rated for continuous service to 350°C (662 °F). It conducts heat at 22 W/m·K (12.7 BTU/hr·ft·°F), worse than 66% of refractory metal grades. Thermal expansion is 5.9 µm/m·K (3.28 µin/in·°F).
Electrical3
Zr 700-HW conducts electricity at 4.3 % IACS, worse than 62% of refractory metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), better than 64% of refractory metal grades.
Sustainability4
Producing a kilogram of Zr 700-HW takes about 1,400 MJ of energy and emits 90 kg of CO₂ — more than 67% of refractory metal grades. Typical recycled content is 20%.
Manufacturability8
Zr 700-HW's machinability is fair (35/100, better than 81% of refractory metal grades); weldability very good (72/100); formability good (65/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Zr 700-HW
Is Zr 700 easy to machine?
Run slow-speed, heavy-feed, sharp positive-rake carbide with flood chlorinated-free coolant; never dry-grind — fine Zr chips and dust are pyrophoric and must be kept wet and stored under water or oil.
Can Zr 700 be welded?
GTAW/plasma or EBW with high-purity argon trailing shields and backing (or a chamber); keep O, N and H pickup low, clean and pickle before welding, and check for a bright silver bead — straw/blue/grey means embrittlement.
Can Zr 700 be formed, bent or molded?
Best-forming zirconium grade: cold bend, deep-draw and spin readily with generous radii (≥3t), slow speeds and non-chlorinated lubricants; warm form at 200–300 °C for severe draws, stress relieve at 540 °C.
What surface finishes work on Zr 700?
Pickle in HNO3/HF to remove oxide and forming lubricant before service or welding; anodizing gives decorative colours, and glass-bead or vibratory finishing is preferred over abrasive grinding for safety.
Zr 700 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 |
|---|---|---|
| Hfcounted within Zr+Hf | ≤ 4.5 | 2 |
| Fe+Cr | ≤ 0.2 | 0.1 |
| Olow-oxygen limit is what distinguishes Zr 700 from Zr 702 | ≤ 0.1 | 0.07 |
| C | ≤ 0.05 | 0.02 |
| N | ≤ 0.03 | 0.01 |
| H | ≤ 0.01 | 0 |
| Zr+Hfhafnium is not removed in industrial grades | ≥ 99.2 (balance) | — |
Zr 700-HW — frequently asked
What is Zr 700-HW used for?
Zr 700-HW is typically used for formed sheet components, deep-drawn parts and specialty corrosion-resistant tubing. In short: most formable zirconium grade; low-oxygen ductile CP zirconium; deep-drawing corrosion grade.
What is the yield strength of Zr 700-HW?
Zr 700-HW has a typical yield strength of 230 MPa (33.4 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 79% of refractory metal grades. Strength varies by condition: see the 4 listed tempers.
Is Zr 700-HW easy to machine?
Not especially — machinability is rated fair (35/100, better than 81% of refractory metal grades). Run slow-speed, heavy-feed, sharp positive-rake carbide with flood chlorinated-free coolant; never dry-grind — fine Zr chips and dust are pyrophoric and must be kept wet and stored under water or oil.
Can Zr 700-HW be welded?
Yes — weldability is rated very good (72/100). GTAW/plasma or EBW with high-purity argon trailing shields and backing (or a chamber); keep O, N and H pickup low, clean and pickle before welding, and check for a bright silver bead — straw/blue/grey means embrittlement.
What surface finishes work on Zr 700-HW?
Pickle in HNO3/HF to remove oxide and forming lubricant before service or welding; anodizing gives decorative colours, and glass-bead or vibratory finishing is preferred over abrasive grinding for safety.
Can Zr 700-HW be formed, bent or molded?
Best-forming zirconium grade: cold bend, deep-draw and spin readily with generous radii (≥3t), slow speeds and non-chlorinated lubricants; warm form at 200–300 °C for severe draws, stress relieve at 540 °C.
What is the maximum service temperature of Zr 700-HW?
Zr 700-HW is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Zr 700 Annealed and Zr 700-CW?
Annealed is the default condition — standard stocked condition for plate, sheet, strip, bar and forgings; maximum ductility for forming, bending and welding. CW: highest strength and springback for thin strip, foil and drawn wire where no further forming is required. Yield strength is 190 MPa in Annealed versus 440 MPa in CW.
Sources
- ASTM B550/B550M — Zirconium and Zirconium Alloy Bar and Wire — ASTM International (2020)
- ASTM B551/B551M — Zirconium and Zirconium Alloy Strip, Sheet and Plate — ASTM International (2019)
- ASTM B493 — Zirconium and Zirconium Alloy Forgings — ASTM International (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Zirconium) — ASM International (1990)
- ATI / Wah Chang Zirconium Alloys technical data — ATI Specialty Materials (2020)
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.