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Send EmailBoron Copper Alloy, Boron Copper Alloy, 7440-42-8, 7440-50-8
| Section | Content | ||
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| Product Name | Boron Copper Alloy (Grade 2B) | ||
| CAS Number | Boron: 7440-42-8 / Copper: 7440-50-8 (Alloy: Mixture – not assigned) | ||
| Description | A boron‑microalloyed copper alloy engineered to retain high electrical conductivity while providing superior high‑temperature strength, softening resistance, and wear resistance. | ||
| Chemical Composition | Copper (Cu): ≥ 99.5 % Boron (B): 0.02 – 0.05 % Other trace elements: ≤ 0.1 % | ||
| Appearance | Metallic lustre, characteristic reddish‑brown solid (rods, ingots, plates) | ||
| Microstructure | Boron forms fine boride precipitates at grain boundaries, increasing mechanical strength and acting as a deoxidiser to stabilise conductivity. | ||
| Key Physical Properties | • Density: 8.86 g/cm³ • Melting Range: 1013 – 1050 °C (slightly lower than pure copper) • Electrical Conductivity: ≥ 92 % IACS • Thermal Conductivity: ~340 W/m·K |
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| Mechanical Properties (RT) | • Hardness: 65 – 75 HRB • Tensile Strength: 280 – 350 MPa • Yield Strength (0.2 % offset): ≥ 200 MPa • Elongation: ≥ 20 % |
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| Superior Features | • High‑temperature softening resistance: Much less hardness loss after annealing compared to pure copper. • Corrosion resistance: Stabilised oxide layer; good atmospheric corrosion resistance. • Weldability: Boron prevents oxidation during welding; suitable for TIG and MIG processes. |
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| Packaging | Standard 25 kg bundles of rods/ingots, or custom sizes upon request. | ||
| Storage | Keep in a dry, ventilated area away from direct sunlight, acids (sulphuric, nitric, etc.) and incompatible chemicals. | ||
| Safety | Non‑toxic in solid form. During machining (cutting, grinding, welding) use appropriate PPE – masks, goggles, gloves – to avoid inhalation of metal dust/fume. | ||
| Supplier | Betakim Tekstil San. ve Tic. Ltd. Şti – Çorlu, Tekirdağ, Türkiye |
Boron Copper Grade 2B is used where pure copper is mechanically or thermally inadequate, but expensive superalloys (e.g. CuBe, CuCrZr) would be over‑engineered. It offers an optimal cost‑performance balance.
High‑voltage contacts & busbars: Resist arc erosion and wear during repeated make/break cycles. Pure copper busbars soften and deform when hot; Grade 2B retains dimensional stability.
Resistance welding electrodes: Prevents electrode tip mushrooming, especially in stainless steel and titanium welding. Offers a service life close to CuCrZr at a lower cost.
Electric motor rotor bars: In high‑speed motors, increases resistance to centrifugal force and heat, boosting efficiency.
Example: In an automotive headlamp contactor, a pure copper pin wore out after 50,000 cycles, while a Grade 2B pin exceeded 80,000 cycles, reducing warranty costs.
Master alloy (additive): Used as a grain refiner in brass, bronze and cupronickel production. Boron‑bearing variants improve casting yield and feeder efficiency.
Deoxidiser: Reacts with dissolved oxygen in the melt, producing gas‑free, pore‑free castings. Lowers conductivity far less than phosphor‑copper deoxidants.
Example: In continuous casting, mould plates made of Grade 2B minimise thermal shock cracking.
Welding tips & gas nozzles: Preferred in MIG/MAG torches where high thermal conductivity and oxidation resistance are required simultaneously.
Induction coils: In heat‑treatment furnaces, coils carry high current continuously. Pure copper coils deform at operating temperature and may short‑circuit; Grade 2B reduces this risk.
Example: In a glass fibre production line, cooling jaws (bushings) made of Grade 2B instead of pure copper extended service life by 40 %.
Due to low vapour pressure at high temperature and radiation stability, it is investigated for use in fusion reactor heat‑sink components.
The table below compares Boron Copper Grade 2B with its main rivals. Select based on your application priority (conductivity, strength, cost, environmental compliance).
| Property | Boron Copper (2B) | ETP Copper (C11000) | CuCrZr | Beryllium Copper (CuBe2) | Brass (CuZn30) |
|---|---|---|---|---|---|
| Electrical Conductivity | High (92 % IACS) | Very High (100 % IACS) | Medium‑High (80 % IACS) | Low (22 % IACS) | Low (28 % IACS) |
| Mechanical Strength (RT) | Medium (300 MPa) | Low (220 MPa) | High (450 MPa) | Very High (≥1200 MPa) | Medium (350 MPa) |
| High‑Temp. Strength | Good (softening ~450 °C) | Poor (softening ~200 °C) | Excellent (~500 °C) | Excellent (~500 °C) | Poor |
| Wear Resistance | Good | Poor | Very Good | Excellent (unlubricated) | Moderate |
| Machinability | Good (~30 %) | Poor (20 %) | Moderate | Moderate | Excellent (100 %) |
| Cost Index | 3 (Economical) | 1 (Base) | 8 (Expensive) | 15 (Very Expensive) | 2 (Cheap) |
| Toxicity / Environment | RoHS Compliant, Non‑toxic | RoHS Compliant | RoHS Compliant | Beryllium dust toxic – special handling required | May be non‑RoHS if leaded |
1. Boron Copper (2B) vs. ETP Copper (Pure Copper):
Pure copper offers the highest conductivity but rapidly recrystallises and softens above ~200 °C, losing its load‑bearing capacity. Grade 2B pushes the softening temperature to ~450 °C, making it vastly superior for any moving, hot‑operating contact. If your application is a static busbar, pure copper may suffice; if it is a dynamic, heated contact, Grade 2B is the clear winner.
2. Boron Copper (2B) vs. CuCrZr:
CuCrZr is the benchmark for resistance welding electrodes—its hardness and thermal strength are outstanding. However, its conductivity is limited to ~80–85 % IACS and it is expensive. If your design requires conductivity above 90 % IACS and stress levels are moderate, Grade 2B is a much more cost‑effective choice.
3. Boron Copper (2B) vs. Beryllium Copper (CuBe):
Beryllium copper is unbeatable in fatigue and hardness, but its dust is carcinogenic. Many industries (REACH/OSHA) are restricting or banning CuBe. RoHS‑compliant, non‑toxic Grade 2B is the “green” alternative, particularly for companies exporting to the European market.
Boron Copper Alloy Grade 2B is a “sweet spot” material. It is the answer when you need:
High current‑carrying capacity while heating up,
No softening like pure copper under heat,
No toxic beryllium dust,
High efficiency without blowing the budget.
Supplier Contact Note: When contacting Betakim Tekstil San. ve Tic. Ltd. Şti, request the latest minimum order quantity, current price per kg (in exchange‑rate‑adjusted currency), and available standard rod diameters for Grade 2B Boron Copper.