B25

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Product information

Model: B25 
B25 white copper is a copper-nickel alloy with excellent mechanical properties, corrosion resistance, and processing performance, and is widely used in marine engineering, high-end manufacturing, and other fields. Here are its main performance characteristics:
II. Mechanical Properties
‌Strength‌ Tensile strength: 450-750 MPa (up to 750 MPa in cold processed state)
Yield strength: 250-350 MPa
‌Plasticity‌ Elongation: ≥ 20%-25% (soft state)
Hardness‌ HV 130-170 (semi-hard state)
III. Physical Properties
‌Density‌: 8.7-8.9 g/cm³
‌Melting point‌: 1100-1280℃ (varies among different sources)
‌Electrical/thermal conductivity‌: Electrical conductivity is approximately 10-15% of pure copper, thermal conductivity is 30-40% 39
IV. Corrosion Resistance
Resistance to seawater corrosion: Annual corrosion rate < 0.02mm
Resistance to dilute sulfuric acid, hydrochloric acid, etc. chemical media corrosion
Resistance to biological adhesion, suitable for marine environment
V. Processing Properties
‌Cold/Hot processing properties‌: Good, can be made into rods, plates, tubes, etc.
‌Welding properties‌: Need to pay attention to the influence of low-melting-point eutectics (Cu + Cu₂O) at grain boundaries
‌Forming properties‌: Suitable for complex forming processes such as stamping and forging
VI. Special Properties
‌Non-magnetic‌: Suitable for precision instruments and medical devices
‌Low-temperature toughness‌: Maintains good toughness, suitable for cold environments
‌Thermoelectric properties‌: Low resistivity (0.40 μΩ·m), can be used as thermocouple material
VII. Application Areas
‌Marine Engineering‌: Condenser tubes for seawater desalination, shaft sleeves for ship propellers
‌High-end Manufacturing‌: Medical devices, precision instrument gears
‌Energy and Chemicals‌: Pump vanes for nuclear power plants, reaction vessel linings for chemical plants
‌Electronic and Electrical‌: Relay spring, connection terminals

Product parameter

Chemical composition

The chemical composition of B25 white copper mainly consists of copper and nickel, along with a small amount of iron, manganese and other elements. The specific composition is as follows:
Copper (Cu)
As the main component, its content is approximately 70%-75%, and the remaining part is filled by other elements. ‌
Nickel (Ni)
The content is between 24.0% and 26.0%, and it is the core strengthening element of the alloy. ‌
Impurity elements
Iron (Fe): ≤ 0.5% ‌
Manganese (Mn): 0.5% ‌
Zinc (Zn): 0.3% ‌
Silicon (Si): 0.15% ‌
Magnesium (Mg): 0.05% ‌
Lead (Pb): ≤ 0.001% ‌
Sulfur (S): ≤ 0.01% ‌
Carbon (C): ≤ 0.05% ‌
Phosphorus (P): ≤ 0.01% ‌
Tin (Sn): 0.03% ‌
The above data are based on the combined results from different sources, and the specific composition may vary slightly due to different production processes. ‌

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COMPANY PROFILE




Shiyu Metal Material Technology Co., Ltd. is a collection of procurement, processing, agent, sales, logistics, warehousing in one of the enterprises, the company has a large-scale spot supply base in China, with domestic and foreign large steel mills and suppliers to maintain good relations of cooperation, with a full range of multi-channel procurement resources.
Shiyu Metal main products: nickel base alloy, Hastelloy, super austenitic stainless steel, duplex stainless steel, cobalt base alloy, pure nickel, titanium and titanium alloy, heat resistant, corrosion resistant alloy and other kinds of steel, a large number of product categories, can meet the size and thickness customization, prefabrication and other diversified needs.
The company has ISO9001 quality certification, the company's product standards include: the United States (UNS) ASTM /ASME, AMS, German DIN/EN, Japan (SUS) JIS and other standards supply, provide the original material certificate. We can supply according to the standards and technical requirements provided by customers to ensure that the goods and specifications are complete to meet the needs of various merchants. From raw materials to finished products, all go through three quality inspection to ensure the qualified rate of finished products. Shiyu Metal strives for perfection in every detail to ensure that the quality of products in different countries and regions around the world can meet international standards. Shiyu Metal has established a good strategic cooperative relationship with the world famous steel mills such as HAYNES, ATI, SPECIALMETALS, VDM, OUTOKUMPU, Japan Metallurgy, Nippon Steel, and Datong Special Steel.
The products supplied by Shiyu Metal are widely used in nuclear power, petrochemical, mechanical engineering, precision processing, aerospace, electronic instruments, medical equipment, automobile manufacturing, environmental protection, wind power application, seawater desalination, shipbuilding industry, paper making machinery, mining engineering, cement manufacturing, metallurgical manufacturing, corrosion resistant environment field, high temperature environment field, mold field, etc. It is a global high-quality supplier of special steel materials.
Shiyu Metal Material Technology Co., Ltd. is committed to the purchase, agent and sales of special steel, and has a perfect special steel sales management system and product quality supervision system. The company has been adhering to the "integrity, innovation, responsibility, win-win" business philosophy, adhere to the "quality first, customer first" service purpose, to provide customers with quality services and high-quality steel products. Shiyu Metal actively participates in the development of domestic steel industry ecology, and is willing to contribute to the development of national special steel.



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Shiyu Metal maintains good cooperative relations with medium and large steel mills and suppliers at home and abroad, 

and has established good strategic cooperative relations with world famous steel mills such as the United States, Germany, Finland and Jap.




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