ASTM B550 Zirconium Wire Description
Introduction
ASTM B550 zirconium wire is a high-performance metallic wire engineered for rigorous industrial and chemical service conditions. The standard governs zirconium and zirconium alloy wires, covering commercially pure grades (R60702, R60703) and alloyed variants including R60704 (Zr-Sn) and R60705 (Zr-2.5Nb, commonly referred to as Zr705).
Zirconium wire features exceptional corrosion resistance, moderate tensile strength, excellent ductility, and non-magnetic properties. It maintains stable performance in harsh chemical media and high-temperature water environments, widely applied in chemical processing, nuclear energy, electronics, medical devices, and precision manufacturing.
Compared with titanium and stainless steel, zirconium exhibits superior chemical inertness to mineral acids, concentrated alkalis, and hot chloride solutions. Its exceptional chemical stability ensures extended service life under demanding service conditions, while conventional metals suffer premature degradation.
Specifications
1. General Diameter Range
- Standard stock diameters: φ0.1 mm–φ4.8 mm (reference GB/T 3623-2022, similar to ASTM B550), custom diameters up to φ10.0 mm are available upon request.
- Common welding wire sizes: φ0.8, 1.0, 1.2, 1.6, 2.0, 2.4, 3.0 mm.
- Common structural and electrode sizes: φ0.5, 0.6, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 mm.
- Ultra-fine sizes: φ0.1, 0.15, 0.2, 0.3, 0.4 mm (for precision instruments, electronics, and medical use).
2. Supply Forms
- Coil wire: wound on plastic,metal and wooden spools, 500–3000 m per coil, ideal for automatic welding & mass production.
- Straight wire: straightened & cut to order, standard lengths 500–3000 mm per piece, for manual use & small batches.
3. Surface Conditions
| Surface type | Process & feature | Typical Ra | Application |
| hot-rolled | As-rolled with oxide scale | 1.6–3.2 μm | Rough machining, further processing |
| Pickled | Acid-cleaned, oxide-free | 0.8–1.6 μm | General corrosion service, chemical equipment |
| Bright & ground | Mechanically polished, smooth | 0.2–0.8μm | Automatic wire feeding, precision parts |
4. Supply Condition (Temper)
| Condition | Code | Feature | Typical use |
| Annealed(soft) | M | Fully recrystallized, excellent ductility | Welding, bending, forming, coiling |
| Cold-worked | Y | Strain-hardened, higher strength | Structural parts, springs, wear-resistant components |
| Stress-relieved | m | Low-temperature anneal, dimensional stable | Precision machined parts |
5. Chemical Composition (Reference – ASTM B550 / GB/T 3620.1)
Composition varies by grade. The most common grades are R60702 (commercially pure) and R60705 (Zr-2.5Nb)
Oxygen (O)≤ 0.16%≤ 0.18%Affects strength and hardness
| Element & category | R60702 (Pure Zr) | R60705 (Zr-2.5Nb) | Note |
| Zr + Hf | ≥ 99.2% | ≥ 95.5% | Base element |
| Nb | – | 2.0–3.0% | Key alloying element |
| O | ≤ 0.16% | ≤ 0.18% | Affects strength and hardness |
| H | ≤ 0.015% | ≤ 0.005% | Reduce plasticity and toughness |
| Fe+Gr | ≤ 0.20% | ≤ 0.20% | Controlled impurities |
| C | ≤ 0.05% | ≤ 0.05% | Avoids em-brittling |
| N | ≤ 0.025% | ≤ 0.025% | Maintains ductility |
6.Mechanical Properties
(Room temperature, annealed condition–typical for R60702 and R60705)
| Grade | Tensile strength（MPa) | Yield strength (MPa) | Elongation (%) | Hardness |
| R60702(Pure Zr) | ≥ 380 | ≥ 205 | ≥ 16% | ~75HRB |
| R60705 (Zr-2.5Nb) | ≥ 580 | ≥ 380 | ≥ 16% | 200–240HRB |
Note: Cold-worked (Y) condition provides higher strength (Rm ≈ 650–750 MPa) and lower elongation (8–12%), making it suitable for applications requiring high strength.
7.Physical Properties (Typical for Zirconium)
| Property | Value | Note |
| Density | 6.51 g/cm³ | Heavier than titanium (4.51), lighter than many nickel alloys |
| Elastic modulus | ~95GPa | Moderate stiffness |
| Melting point | ~1855 °C | High thermal stability |
| Thermal conductivity | ~17.1 W/(m·K) | Lower than copper, similar to stainless steel |
| Magnetism | Non-magnetic | Suitable for sensitive electronic and medical environments |
8.Corrosion & High-Temperature Performance
- Excellent corrosion resistance: Resists HCl, H₂SO₄, HNO₃, organic acids, strong alkalis & hot chlorides; outperforms Ti & stainless steel in reducing acids.
- Self-healing oxide film: Forms a protective, self-repairing layer for long-term reliability.
- Hot water & steam resistance: Performs exceptionally well, widely used in nuclear reactor cores.
- Temperature range: Stable from cryogenic up to 350 °C; short-term use at higher temps allowed.
- Weldability: Excellent via TIG/MIG with high-purity argon; requires proper cleaning & shielding.
Product Features
- Superior corrosion resistance–Outlasts stainless steel and many nickel alloys in aggressive chemical media.
- Multiple grades available–R60702 suits conventional anti-corrosion scenarios, while R60705 fits heavy-duty structural usage.
- Good ductility–Annealed wire can be bent, coiled, and formed without cracking.
- Clean surface options–Pickled, bright, or electropolished finishes to suit different applications.
- Non-magnetic–Ideal for sensitive electronic, medical, and defense applications.
- Bio-compatible grades available–Suitable for certain medical implants and surgical instruments.
- Proven in nuclear service–Decades of reliable use in pressurized water reactors.
- Wide size range-From 0.1mm ultra fine wire up to 10mm diameter.
Technical Advantages
- High precision: Diameter tolerance ±0.01mm, stable auto feeding.
- Specialized for reactive metals: Optimized for Ti, Zr, Ni alloys; no contamination or die sticking.
- Controlled microstructure: Fine & uniform grain, stable mechanical properties.
- Full process control: VAR melting to final inspection, consistent batches & full traceability.
- High straightness: Straight wire up to 1mm/m, ideal for auto feeding & precision welding.
- Flexible supply: Coil for continuous production; straight lengths for manual use.
- Lubricated coating: Smooth forming, no die sticking, high precision shaping.
Applications & Solutions
1. Chemical & Environmental Engineering (Primary Market):
- Corrosion-resistant fasteners–screws, bolts, nuts, and washers in hydrochloric acid, sulfuric acid, urea synthesis, and hot alkalis.
- Heat exchanger components–tubing, fins, and tube bundles for aggressive media.
- Pump and valve parts–shafts, sleeves, stems, seats, and impellers.
- Environmental equipment–spray bars, mist eliminators, and scrubber components in flue gas desulfurization systems.
- Electrochemical applications–anodes, cathodes, and current distributors in chlor-alkali and metal recovery cells.
2. Nuclear Power & Energy:
- Fuel assembly components–end plugs, guide tubes, spacer grids, and cladding for pressurized water reactors.
- High temperature heat exchangers in solar thermal, advanced reactor designs, and chemical plants.
- Nuclear waste processing–corrosion-resistant components for spent fuel handling.
3. Precision Machinery & Special Processing
- High-elasticity springs and clips for corrosive environments.
- Electronic connectors and terminals for aerospace, defense, and high-end industrial equipment.
- Medical devices–surgical needles, guide wires, dental tools, and precision instruments (biocompatible grades available).
4. Aerospace & High-Performance Automotive
- Fuel lines and hydraulic tubing where corrosion resistance, weight savings, and reliability matter.
- Selected engine components and exhaust system parts for high temperature service.
5. Other Specialized Uses:
- Thermal spray wire, Crystal growing equipment, Laboratory and pilot plant equipment.
Execution Standards & Equivalent Grades (ASTM B550 Family)
Region | Standard | Grade/UNS |
USA (ASTM/ASME) | ASTM B550/ASME SB550 | R60702, R60703, R60704, R60705, R60706 |
China (GB) | GB/T 8769, GB/T 3623 | Zr-0, Zr-2, Zr-3, Zr-4, Zr-5 |
International (ISO) | ISO 5832-3 | Zr-2.5Nb (medical) |
Europe (EN/DIN) | EN 2.4856 | Zr705 |
Japan (JIS) | H4150 | Zr-5 |
Comparison of Common ASTM B550 Zirconium Grades
Property | R60702 (Pure Zr) | R60704 (Zr-Sn) | R60705 (Zr-2.5Nb) | Property | R60702 (pure Zr) |
Main alloy | none | Sn (1.0–2.0%) | Nb (2.0–3.0%) | Main alloy | none |
Yield strength (min) | ≥205 MPa | ≥240 MPa | ≥380 MPa | Yield strength (min) | ≥205 MPa |
Corrosion resistance | Good (general) | Good nuclear water) | Excellent (strong acids/alkalis) | Corrosion resistance | Good (general) |
Custom Processing Capabilities
We offer complete custom processing from raw material to finished wire:
Materials: Zirconium (R60702, R60704, R60705, R60706), titanium (Gr1, Gr2, Gr5, Gr9, Gr12, etc.), and nickel alloys; Form: Coil wire (various spool sizes and weights) or straight cut lengths; Surface treatments: Pickled, bright, ground, electro-polished, or custom finishes; Batch delivery: Annual capacity supports large-volume, high-standard custom orders.
1. Production Line Strength
- We have invested 40.5 million US dollars in state-of-the-art Danieli continuous rolling production lines.
- We have effectively addressed key industrial constraints concerning ovality tolerance, production yield and machining allowance, thus achieving reliable mass production of high-performance zirconium wires. Boasting an annual output capacity of 10,000 metric tons, our products are widely applicable to aerospace, electronics, medical devices, eyewear and chemical industries.
2. Advanced Equipment Capabilities:
- Internationally advanced core equipment for the full line.
- Heating system: Induction heating/resistance heating+supplementary heating furnace+trolley furnace, precise temperature control at 1200℃ for uniform heating of titanium billets.
- Reversible mobile billet rolling mill: Stable initial breakdown of large titanium ingots.
- Continuous rolling main unit: Danieli GCC short-stress rolling mill (5543+4334), horizontal and vertical alternating arrangement for high-precision continuous rolling.
- Shearing machine: Online fixed-length cutting with precise head and tail treatment.
- Finishing and refining unit: Finishing, coiling, straightening, peeling, polishing, online inspection.
- Full-line automatic control system: Danieli automation, closed-loop control of thousands of process points, stable production without manual intervention.
3. Comprehensive Processing Services:
Materials: pure titanium, titanium alloy, zirconiumand nickel.
- Diameter: 0.1–6.5mm; customizedin diameter, tolerance and form (straight and coil wire).
- Surface treatment: cleaning, degreasing, annealing; pickled, bright, matteand anodized (Apple-style space gray, silver) or functional surfaces.
- We can provide full-process custom processing from raw material to finished product, ensuring high precision, high performance and stable supply.
- Batch delivery: annual capacity 10,000 tons for large-volume, high-standard custom orders.