C51900 Phosphor Bronze

C51900 Phosphor Bronze

93.0–95.0%
Copper Content
5.5–7.0%
Tin Content
0.03–0.35%
Phosphorus Content
C51900 phosphor bronze is a high-strength copper-tin alloy offering excellent fatigue resistance, wear resistance, elasticity, and corrosion resistance. It is widely used in springs, connectors, electrical contacts, and precision industrial components.
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Lead Time: 3-5 Business Days

Product Overview

C51100 phosphor bronze is a medium-tin copper alloy containing approximately 4% tin with controlled phosphorus additions to improve wear resistance, fatigue strength, and mechanical performance. It provides a balance between the conductivity of pure copper and the strength of higher-tin phosphor bronze alloys.

Produced through precision rolling, drawing, and heat treatment processes, C51100 bronze offers excellent elasticity, dimensional stability, and corrosion resistance. Compared with C51000, it provides similar conductivity while maintaining excellent spring properties and forming characteristics.

C51100 phosphor bronze is extensively used in electrical connectors, spring contacts, relay components, precision stampings, and industrial wear parts where durability and fatigue resistance are critical. It is widely applied across electronics, telecommunications, automotive, aerospace, and industrial manufacturing industries.

Key Features

Excellent fatigue resistance
Outstanding spring performance
Good wear resistance
High corrosion resistance
Reliable electrical conductivity
Excellent formability and stampability

Available Sizes

Copper Shape Thickness (mm) Width/Diameter (mm) Length (m)
Bar - Φ5-200 1-6
Wire - Φ0.05-10 Customize
Sheet 0.25-6 500-2500 1-6
Plate 6-200 200-3000 1-6
Strip 0.15-6 8-610 Customize
Tube OD: φ2-600; WT:φ0.2-100mm - 1-6
Coil 0.15-6 3-1250 1-6
Foil < 0.15 10-1350 Customize
Profile Customized Customize Customize

* Custom sizes available upon request. Contact our sales team for special requirements.

Technical Specifications

Precision data for engineering decisions. All values tested per ASTM standards.

01 Material Properties

Specification Value Notes
Cu Content 93.0–95.0% Phosphor bronze composition
Sn Content 5.5–7.0% Provides strength and wear resistance
P Content 0.03–0.35% Improves fatigue performance
Density 8.88 g/cm³ Typical value
Electrical Conductivity ~13–15% IACS Typical annealed condition
Tensile Strength 500–850 MPa Depends on temper
Elongation ≥ 8% Varies by temper
Hardness 90–220 HV Depends on temper
Available Tempers O / H02 / H04 / Spring Temper Custom temper optional
Elongation ≥ 8% Typical annealed/extruded condition
Fabrication Stamping / Forming / Drawing Excellent cold workability
ASTM Standard ASTM B103 / ASTM B139 EN & JIS available

Applications & Use Cases

Proven solutions across diverse industries. From aerospace to marine environments.

Frequently Asked Questions — C51900 Phosphor Bronze

Practical FAQ for engineers and buyers specifying C51900 phosphor bronze (CuSn6 / PB6).

C51900 (CuSn6, ~6% tin phosphor bronze) contains about 5.5–7.0% tin with phosphorus 0.03–0.35% and copper as balance. It is covered by ASTM B103/B103M (plate, sheet, strip, rolled bar) and ASTM B139 (rod, bar). It is a wrought spring-grade alloy widely used for precision elastic parts.
Annealed (O) tensile strength is about 315–410 MPa with elongation 50+%; in half-hard it is 490–610 MPa and in spring temper (H08) 680–830 MPa with fatigue endurance around 250 MPa. Electrical conductivity is roughly 16–20% IACS and it is non-magnetic. Its high elastic limit and low elastic hysteresis earn it the label 'king of elastic materials.'
At 6% tin it sits between C51000 (5%) and C52100 (8%): stronger and more fatigue-resistant than C51000, easier to form and slightly more conductive than C52100. Pick C51900 when you need high spring performance without the forming difficulty of 8% tin grades.
Precision springs, connector and terminal springs, relay reeds, diaphragms, bellows, wear strips, bearings, bushings, and instrument elastic elements. It resists atmospheric, freshwater, and seawater corrosion and resists stress-corrosion cracking better than many copper alloys.
Yes. We supply C51900 strip, sheet, rod, and bar to ASTM B103/B139 with MTR/MTC per order and SGS on request. Tempers from annealed to spring hard and custom sizes are available at low MOQ with 10–60 day lead times, plus in-house cutting, CNC, and finishing. Quote requests get a response within 1 business hour.
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