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Dimensional Specifications for C90500 Copper Tubes
C90500 tubes are available in a broad range of sizes, with standardized dimensions adhering to industrial requirements:
- Outside Diameter (OD): 6 mm to 530 mm
- Wall Thickness: 0.5 mm to 50 mm
- Length: 1 m to 12 m (custom lengths up to 30 m may be available depending on supplier capabilities) .
Specific examples include ultra-fine tubes (e.g., OD 0.75 mm, ID 0.23 mm, wall thickness 0.26 mm) for specialized applications, though these are less common . The alloy is typically supplied in drawn or as-cast forms, with dimensional tolerances governed by manufacturing standards.
International Standards
C90500 copper tubes are governed by the following key standards:
- ASTM B584: Specifies the chemical composition, mechanical properties, and testing requirements for C90500 bronze castings, including tubes. This standard defines its operational temperature range as -198°C to 204°C (-325°F to 400°F) .
- UNS C90500: Unified Numbering System classification ensuring material consistency across international markets .
- Supplementary Standards:
- ASTM B75/B75M: While primarily for seamless copper tubes (C10100–C12200), it provides general guidelines for dimensional and mechanical testing applicable to bronze alloys in tube form .
- GB/T (China): Certain Chinese standards (e.g., GB/T 17791, GB/T 18033) align with international norms and are recognized in trade for specific applications like HVAC and piping .
Chemical Composition
C90500 is a tin bronze alloy primarily composed of copper (Cu) and tin (Sn), with trace amounts of other elements to enhance specific properties. The composition adheres to ASTM standards such as ASTM B22-2002 and ASTM B584 for casting applications. The typical ranges are as follows:
Key Observations:
- Tin content (9–11%) is critical for forming hard intermetallic phases (e.g., α + δ eutectoid), which improve wear resistance .
- Zinc (1–3%) balances fluidity during casting while maintaining corrosion resistance .
- Low lead content (≤0.3%) ensures compliance with environmental regulations for potable water systems .
Mechanical Properties
C90500 is renowned for its high strength, excellent wear resistance, and moderate ductility, making it suitable for heavy-load applications. Typical mechanical properties (as-cast or sand-cast condition) include:
Additional Performance Characteristics:
- Wear Resistance: C90500 exhibits a low wear factor (2.7×10⁻⁹ mm³/N·m) under heavy loads, outperforming leaded bronzes like C93200 in high-pressure scenarios .
- Corrosion Resistance: Excellent resistance to seawater and steam, ideal for marine components and valves .
- Thermal Properties: Thermal conductivity ≈43.2 BTU/(ft²·hr·°F), with a thermal expansion coefficient of 11×10⁻⁶/°F .
Production process and product advantages of C90500 copper tube:
Production process
Melting and casting process
The raw materials are cathode copper and phosphor copper alloy, which are melted at a high temperature of 1200℃ in an industrial frequency furnace.
The horizontal continuous casting technology is used for casting, and then water-cooled to 50℃ to form copper tube billets.
Rolling and drawing
After the copper tube billets are milled to remove surface defects, they enter the planetary rolling, triple drawing and disc drawing processes to gradually reduce the wall thickness and improve dimensional accuracy.
The stretching process uses a high-speed tandem drawing machine and a floating core head technology to ensure the smoothness and dimensional accuracy of the internal and external surfaces.
Heat treatment and processing
The online annealing process can eliminate work hardening, improve the ductility of the copper tube, and keep the surface bright and free of oxidation spots.
Subsequent processes include straightening, bending, welding and surface cleaning, and finally rewinding (defect detection) to ensure the quality of the finished product.
Casting process optimization
For casting defects (such as shrinkage and pores), measures such as increasing chill, optimizing pouring and riser design, and improving smelting process (such as smelting in a weak oxidizing atmosphere to reduce hydrogen absorption) are adopted to improve the density of castings.
Electromagnetic field treatment can refine the grain structure, inhibit the reverse segregation of tin, and improve the uniformity of materials.
Product advantages
Material properties
High strength and wear resistance: C90500 tin bronze contains 88-90% copper and 10.3-12.0% tin and other elements. It has high strength (tensile strength ≥345 MPa), high elasticity and wear resistance, and is suitable for pipe fittings, gears, etc. under medium loads and sliding speeds.
Corrosion resistance: Resistant to corrosion by the atmosphere, fresh water and some chemical media, especially seawater corrosion, suitable for ships and humid environments.
Thermal conductivity and electrical conductivity: Good thermal conductivity (suitable for radiators) and electrical conductivity (electrical conductivity ≥85% IACS), meeting the needs of electronic devices.
Processing and functionality
Excellent casting performance: high density, good air tightness, small shrinkage coefficient, suitable for precision parts.
Processability: good cold/hot pressure processability, weldable, brazing, excellent cutting performance.
Wide application areas
Industrial field: used for valves, pump bodies, heat exchangers, wear-resistant bearings and anti-magnetic parts.
Electronics and construction: cable conductors, decorative pipes, building pipes, etc.
Production technology support
Use high-precision testing equipment (such as direct reading spectrometer, electronic tensile machine) to ensure stable composition and mechanical properties.
Energy management technology (frequency conversion power regulation, automatic metering) reduces energy consumption and improves production efficiency.
Q1:Do you provide samples? Is it free or extra?
A1:Yes, we can provide samples free of charge and the customer will pay the freight.
Q2:What if I don't have export experience ?
A2:We have reliable forwarder agent which can ship items to you by sea/air/Express to your doorstep. Any way, we will help you choose the most suitable shipping service.
Q3:How long is your lead time?
A3:If it is in stock, it is usually 5-10 days. Or, if there is no inventory, 15 days, depending on the quantity.
Q4:What are your terms of payment?
A4:30% T/T deposit in advance, 70% T/T balance within 5 days after B/L copy, 100%.Irrevocable L/C at sight, 100% Irrevocable L/C after receive B/L 30-120 days, O/A.
Q5:How is your technical support?
A5:We provide lifetime online support through Whatsapp/ Skype/ Wechat/ Email. Any problem after delivery, we will offer you call anytime.
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