HSn90-1 (90-1 Tin Brass) is a high-copper, tin-containing wrought brass alloy with excellent corrosion resistance, good cold and hot workability, and moderate strength. It is commonly used for corrosion-resistant components in ships, marine engineering, and precision instruments.

Below are its detailed composition, performance parameters, and typical applications:

1. Chemical Composition (GB/T 5231-2012)

Element Content (%) Function

Copper (Cu) 89.0–91.0 Base metal, provides corrosion resistance and plasticity

Tin (Sn) 0.7–1.1 Enhances seawater corrosion resistance and dezincification resistance

Zinc (Zn) Balance Adjusts fluidity, reduces cost

Total Impurities ≤0.3 (Pb≤0.03) Strict control of harmful elements such as lead and iron

2. Physical Performance Parameters

Performance Parameter Value/Range Description

Density 8.8–8.9 g/cm3 Slightly lower than pure copper (8.96 g/cm3)

Melting Point 905–935℃ Hot working temperature range: 900–750℃

Thermal Conductivity 110–120 W/(m·K) High thermal conductivity, suitable for heat dissipation components

Electrical Conductivity 25–30% IACS Better conductivity than nickel silver, weaker than pure copper

Linear Expansion Coefficient 19.8×10?? /℃ (20–200℃) Similar to ordinary brass

Elastic Modulus 105–115 GPa Moderate rigidity, good deformation resistance

3. Mechanical Properties (Annealed State)

Performance Parameter Value

Tensile Strength (σ?) 300–350 MPa

Elongation (δ) ≥40%

Hardness (HV) 60–80 HV

Fatigue Strength ≈120 MPa (10? cycles)

4. Core Characteristics

Corrosion Resistance:

Excellent resistance to dezincification corrosion in freshwater, seawater, and humid environments (due to the passivation effect of tin).

Superior stress corrosion cracking (SCC) resistance compared to ordinary brass (e.g., H62, H68).

Workability:

Good cold and hot workability; can be rolled, drawn, and stamped into complex shapes.

Average machinability (requires lubrication to avoid tool adhesion).

Weldability:

Suitable for soft soldering and brazing, but gas welding and arc welding may cause cracks. Protective gas welding (e.g., TIG) is recommended.

5. Typical Applications

Marine and Offshore Engineering:

Seawater condenser tubes, heat exchanger tubes, marine instrument components.

Seawater pump valves, propeller bushings, nautical instrument housings.

Precision Manufacturing:

Clock gears, precision springs, electronic connectors.

Civil Applications:

Decorative hardware, musical instrument reeds, low-pressure valves.

6. Key Processing Points

Process Parameter/Method

Hot Rolling Heated to 700–800℃, final rolling temperature ≥550℃

Cold Drawing Intermediate annealing temperature: 450–500℃, held for 1–2 hours

Annealing Stress relief annealing: 260–300℃, 1 hour

Surface Treatment Nickel plating, tin plating, or passivation treatment (to enhance corrosion resistance)