C54400 Phosphor Bronze "B-2" "Free Cutting" plate/sheet
C54400 is a phosphor bronze alloy containing lead, tin and zinc. It has high strength, excellent cutting performance and wear resistance. It is widely used in precision mechanical parts such as bearings, bushings, gears, sleeves, etc., especially in the fields of aviation, automobiles and heavy machinery.

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Parameter
Chemical Composition
Mechanical Properties

Detailed size range

Hot rolled sheet


Thickness: 2–300 mm

Width: 200–3000 mm

Length: 500–6000 mm

Cold rolled sheet


Thickness: 0.1–12 mm (0.2–3 mm common)

Width: 100–3000 mm

Length: ≤10000 mm

Special specifications


Cold rolled foil is available in thicknesses of 0.05–0.1 mm and widths of 40–600 mm, supplied in coils.



International standards

China GB standard: QSn4-4-4

US ASTM standard: C54400 (corresponding to ASTM B103/B139 standard)

European DIN/EN standard: CuSn4Zn4Pb4

Japanese JIS standard: C5441

International ISO standard: CuSnPb4Zn3




The main components of C54400 are copper as the base, with elements such as tin, lead, zinc and phosphorus added. The specific ranges are as follows:


Copper (Cu): balance (usually accounting for about 87%-89%).


Tin (Sn): 3.5%-4.5% (some documents extend to 3.0%-5.0%).


Lead (Pb): 3.4%-4.5% (key element, improving cutting performance).


Zinc (Zn): 1.5%-4.5% (some documents are marked as 3.0%-5.0%).


Phosphorus (P): 0.01%-0.50% (enhancing wear resistance and rigidity).


Other elements: Iron (Fe) ≤0.10%, the total of impurities such as aluminum (Al) and antimony (Sb) ≤0.2%.


Mechanical properties are significantly affected by the material state (such as annealing, cold working, heat treatment), and the main parameters are as follows:


Tensile strength


Range: 275 MPa (annealed state) to 745 MPa (spring aged state).

Typical value: 345-450 MPa for hard bars, up to 670 MPa for spring aged (H08).

Yield strength


Range: 131-434 MPa, depending on the processing state.

Elongation


Annealed state: up to 50% (some literature marked as 8%-18%).

Hard state: ≥8% (such as hard bars).

Hardness


Rockwell hardness (HRB): 7 (soft state) to 97 (superhard state).

The Rockwell B hardness of spring aged (H08) is 92.

Modulus of elasticity: 110 GPa (Young's modulus), shear modulus 40 GPa.


Other key properties

Processing performance


Cold workability: Excellent, suitable for stamping, bending and other processes, but the lead content limits deep drawing.

Hot workability: Not recommended, because lead may cause hot brittleness.

Weldability: Good soldering and brazing, but not suitable for oxyacetylene welding.

Corrosion resistance


Excellent performance in seawater, atmosphere and acid and alkali environment, suitable for marine engineering.

Application areas


Bearings, bushings, gears, valve parts, electrical connectors, etc.


INTRODUCTION

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Production process and product advantages of C54400 copper plate:


1. Production process

Cold processing process

C54400 copper plate mainly adopts cold processing, including cold rolling, cold forging and other processes. Since the lead component is easy to cause hot brittleness during hot processing, hot processing is generally not recommended for this alloy. The degree of deformation needs to be controlled during cold processing (generally not more than 30%), and bending, forming and other operations can be performed after annealing.


Casting and forming

Some products are produced by casting process, and lead elements (3.4%-4.5%) are added to improve cutting performance, while tin, phosphorus and other components are combined to optimize mechanical properties.


Heat treatment and annealing

The annealing temperature range is 475-675°C (900-1250°F), and the plasticity and processability of the material are improved by soft annealing process.


Surface treatment

Possible processes include cleaning, degreasing, painting, etc., but the specific steps need to be customized according to application requirements.


2. Product Advantages

Excellent cutting performance

The high lead content (3.4%-4.5%) significantly improves cutting efficiency, which is 4 times that of ordinary tin-phosphor bronze and is suitable for high-precision processing.


Excellent cold workability

It exhibits good plasticity in the cold state, suitable for forming processes such as cold rolling and cold forging, and has moderate deformation capacity.


High strength and wear resistance

The tensile strength can reach 275-745 MPa, and the hardness range is HRB 7-97. It has both high strength and wear resistance, and is suitable for high-load components such as bearings and gears.


Outstanding corrosion resistance

It has excellent corrosion resistance in seawater, atmosphere and acid-base environments, and is especially suitable for applications such as ship propellers and marine engineering equipment.


Good electrical and thermal conductivity

As a copper-based alloy, it inherits the excellent electrical conductivity of copper (thermal conductivity 87.12 W/m·K), and is suitable for electrical equipment and heat conduction components.


Self-lubricating and low friction

The lead element gives the material self-lubricating properties, with a friction coefficient as low as 0.016 (with lubricant), reducing component wear.


FAQ

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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