C5210 Bronze

Grade Designation & Standards

Standard Grade: C5210 (Phosphor Bronze)

International Equivalents:

China GB/T: QSn7-0.2 (refer to GB/T 1176-1987)

USA ASTM: C52100

Applicable Standards:

JIS: JIS H 3130-2018 (Copper and Copper Alloy Sheets/Strips)

Other References: GB/T 1176-1987, ASTM B103

Key Features

1. High Strength & Elasticity: Tensile strength up to 540–640 MPa (hard state) with elongation ≥3%.

2. Superior Corrosion Resistance: Corrosion rate ≤0.01 mm/a in seawater, freshwater, and humid environments; resistant to dilute sulfuric acid and hydrochloric acid.

3. Wear Resistance: Ideal for high-friction applications like bearings and gears.

4. Workability: Supports cold/hot working, welding, and precision machining; plasticity restored post-annealing.

5. Conductivity & Non-Magnetism: Electrical conductivity ~5% IACS, non-magnetic for electronic components.

Common Product Forms & Specifications

Product Form	Size Range	Delivery Condition
Strip	Thickness: 0.1–5.0 mm; Width ≤600 mm	Annealed (O), Hard (H)
Plate	Thickness: 0.1–50 mm; Width ≤1200 mm	Half-hard (1/2H), Hard (H)
Rod	Diameter: 5–150 mm; Length: 1–6 m	Cold-drawn, Hot-rolled
Wire	Diameter: 0.1–12 mm	Coiled or Straight
Tube	OD: 3–200 mm; Wall Thickness: 0.5–20 mm	Annealed, Half-hard
Note: Customizable per JIS H 3130 standards.

Chemical Composition

Element	Cu	Sn	P	Zn	Total Impurities
Content	Balance	7.0–9.0%	0.03–0.35%	≤0.2%	≤0.5%
Typical impurities: Fe≤0.10%, Pb≤0.05%, Ni≤0.2%.

Physical Properties

Property	Value	Remarks
Density	8.9 g/cm³	High structural stability
Melting Point	1170–1350°C	Suitable for high-temperature casting
Electrical Conductivity	~5% IACS	Suitable for low-current applications
Thermal Conductivity	40 W/(m·K)	Moderate heat dissipation
Thermal Expansion Coefficient	17.1×10⁻⁶/°C (20–200°C)	Excellent dimensional stability at high temperatures

Mechanical Properties

Property	Annealed (O)	Hard (H)
Tensile Strength (Rm)	≥375 MPa	540–640 MPa
Yield Strength (Rp0.2)	≥130 MPa	≥450 MPa
Elongation (A50)	≥20%	≥3%
Hardness (HV)	80–120	150–210
Note: Data per JIS H 3130. Hard state suits high-strength parts.

Core Advantages

1. Marine-Grade Durability: Superior resistance to pitting and biofouling in seawater.

2. High Strength-Ductility Balance: Tensile strength ≥540 MPa (hard state) with retained plasticity.

3. Surface Treatment Adaptability: Supports plating, polishing, and passivation for functional and decorative needs.

Product Applications

• Electronics: Connectors, relay springs, EMI shielding.

• Machinery: Bearings, gears, wear-resistant bushings.

• Marine Engineering: Seawater pipelines, valves, pump components.

• Medical Devices: Surgical tools, vascular stents (requires passivation).

Processing Guidelines

1. Welding: Use TIG welding with nickel-based filler (e.g., ERCuNi); avoid zinc vaporization.

2. Machining: Carbide tools with sulfur-based coolant; cutting speed ≤80 m/min.

3. Heat Treatment: Anneal at 700–750°C (stress relief), low-temperature annealing at 250°C.

Key Application Scenarios

• High-Frequency Electronics: Crystal oscillator housings, connector terminals.

• Deep-Sea Valves: High-pressure, corrosion-resistant valve components (hard state recommended).

• Precision Instruments: Optical parts, springs, resistance wires.

FAQs

Q1: How does C5210 differ from C5191?

A1: C5210 has higher tin content (7–9% vs 6–7%) than C5191, offering superior strength and wear resistance at a higher cost.

Q2: Is C5210 JIS suitable for acidic environments?

A2: Suitable for weak acids, but strong acids (e.g., concentrated sulfuric acid) require protective coatings.

Q3: How to prevent edge cracking in cold-rolled strips?

A3: Limit rolling reduction to ≤20% per pass, anneal post-processing, and ensure smooth rollers.

Standard References

• Chemical & Mechanical Properties: JIS H 3130-2018, GB/T 1176-1987.

• Processing: ASTM B543 (Cu-Ni Alloy Tubes).

• Testing: ISO 6892-1 (Tensile Testing).

Note: Data consolidated from industrial standards and testing reports. Actual parameters may vary slightly due to manufacturing processes. Refer to supplier certifications for precise specifications.