Обзор продукта

Phosphor Bronze Balls are precision copper alloy balls made from copper, tin and a small amount of phosphorus. The tin content improves strength and corrosion resistance, while phosphorus contributes to wear resistance, stiffness and fine-grain stability. This alloy system makes phosphor bronze a useful material for moving contact parts, valve seating elements, conductive assemblies and special bearing components where ordinary steel, brass or pure copper may not provide the right balance of performance.

For industrial buyers, the main value of phosphor bronze balls is their balanced performance: they are stronger and more wear-resistant than pure copper balls, non-magnetic like most copper alloys, more mechanically durable than many brass options, and suitable for many water, steam, oil and petrol contact applications. They should not be positioned as stainless steel substitutes in aggressive acid, alkali or chloride-heavy chemical environments.

Material Selection & Technical Positioning

Phosphor bronze is selected when the application requires conductivity plus mechanical durability. It is not as conductive as pure copper, but it provides better wear resistance and fatigue performance. It is not as hard as bearing steel or 440C stainless steel, but it performs well where non-magnetic behavior, corrosion resistance in compatible media, stable contact, and moderate mechanical strength are more important than very high hardness.

The correct industry terminology includes: phosphor bronze balls, CuSn5 bronze balls, CuSn6 bronze balls, CuSn8 bronze balls, C51000 phosphor bronze balls, C51900 phosphor bronze balls, C52100 phosphor bronze balls, copper-tin-phosphorus alloy balls, non-magnetic bronze balls, and bronze alloy balls for valves, conductors and special bearings.

Технические характеристики

Specification Item	Typical Value / Description
Материал	Phosphor bronze / P-bronze / copper-tin-phosphorus alloy
Common Grades	CuSn5, CuSn6, CuSn8; C51000, C51900, C52100
Diameter Range	1.5 mm – 150.0 mm
Прецизионный класс	G100 – G1000
Твердость	HRB 75-105, depending on alloy and temper/condition
Плотность	Approx. 8.8-8.92 g/cm³
Модуль Юнга	Approx. 116-117 GPa
Предел прочности	Approx. 600-700 MPa as a general reference; final value depends on alloy and condition
Магнетизм	Non-magnetic
Electrical Performance	Good conductivity for electromechanical and conductor-related assemblies, lower than pure copper
Отделка поверхности	Polished, cleaned, passivated or customized surface condition upon request
Коррозионная стойкость	Good in water, steam, mineral oils and petrol; not recommended for acids, alkalis or aggressive chemical media without compatibility confirmation
Состояние поверхности	Clean polished or passivated condition; special surface finish upon request
Типичные области применения	Electric conductors, special valves and pumps, check valves, special bearings, instruments, electromechanical contacts, flow-control parts
Packing	Bulk bag, carton, drum, pail, pallet, or customized OEM packing

Chemical Composition Reference

The following composition ranges are reference values for common phosphor bronze alloy families. Final chemical composition should follow the agreed material standard, drawing or purchase order.

Тип	P %	Cu %	Sn %	Zn max %	Pb max %	Fe max %
CuSn5	0.030-0.350	Balance	4.20-5.80	0.30	0.050	0.10
CuSn6	0.030-0.350	Balance	5.00-7.00	0.30	0.050	0.10
CuSn8	0.030-0.350	Balance	7.00-9.00	0.20	0.050	0.10

International Grade Equivalents

США	China	CEN / EN	Germany	France	Великобритания	Russia	Japan
C51000	QSn4-0.3	CW451K	–	CuSn5Zn4	ПБ 102	–	C5102
C51900	QSn6.5-0.1	CW452K	2.1020	CuSn6P	ПБ 103	BrOF6.5-0.15	C5191
C52100	QSn8-0.3	CW453K	2.1030	CuSn9P	ПБ 104	–	C5210

Hardness, Corrosion Resistance & Performance

Phosphor bronze balls are not heat-treated bearing steel balls. Their performance comes from the copper-tin-phosphorus alloy system and the selected production condition. Typical hardness is HRB 75-105, which is suitable for many valve, pump, conductor and special bearing applications but should not be compared directly with HRC values for hardened steel balls.

Corrosion resistance is generally good in contact with water, steam, mineral oils and petrol. However, phosphor bronze balls are not recommended for acids, alkalis or aggressive chemical media unless the buyer confirms chemical compatibility through testing or engineering evaluation. For highly corrosive environments, aluminum bronze, stainless steel, ceramic or other corrosion-resistant materials may be more appropriate.

Applications & Application Fit

Приложение	Fit Level	Why It Fits	Buyer Note
Electric conductors and electromechanical contacts	Very good	Good conductivity combined with better wear resistance than pure copper	Confirm required conductivity, surface finish and contact pressure
Check valves and non-return valve balls	Very good	Stable seating, wear resistance and corrosion performance in compatible fluids	Confirm fluid type, pressure, temperature and sealing requirement
Special valves and pump components	Хороший	Useful mechanical strength and corrosion resistance in water, steam, oils and petrol	Avoid acids and alkalis unless compatibility is verified
Special bearings and low-friction contact parts	Хороший	Low friction and fatigue resistance support controlled movement	Not a substitute for high-speed hardened bearing steel
Instruments and precision mechanical assemblies	Хороший	Non-magnetic behavior and stable alloy performance support sensitive assemblies	Confirm tolerance, finish and magnetic requirement
Marine or outdoor equipment	Application-dependent	Copper alloy corrosion resistance may be useful in some environments	Check chloride exposure and consider aluminum bronze or stainless options if needed
Acid, alkali or aggressive chemical service	Limited / not recommended	Phosphor bronze is not suitable for many acids and alkalis	Select a chemically compatible alternative material

Material Selection Guide

Material Option	Typical Strength	Limitation	When to Recommend
Phosphor bronze balls	Good wear resistance, fatigue strength, non-magnetic behavior and conductivity	Not suitable for acids/alkalis; lower hardness than steel balls	Conductors, check valves, pumps, special bearings and non-magnetic mechanical parts
Pure copper balls	Highest conductivity and excellent formability	Softer and lower wear resistance than phosphor bronze	Electrical contact, decorative, soft copper and high-conductivity applications
Brass balls	Good machinability, conductivity and corrosion resistance at lower cost	Lower wear/fatigue performance than phosphor bronze in some moving contact uses	General valves, switches, instruments, decorative hardware and lower-wear applications
Aluminum bronze balls	Higher strength and better corrosion resistance than phosphor bronze in some environments	Higher cost and different alloy behavior	Marine, heavy-duty valve and stronger corrosion-resistant bronze applications
Stainless steel balls	Better corrosion resistance options and broad grade selection	Lower conductivity; some grades are magnetic/hardened and some are soft	Food, chemical, hygiene, wet and stainless-required applications
Chrome steel / bearing steel balls	High hardness, precision and bearing fatigue performance	Magnetic and not corrosion resistant; no electrical/copper-alloy behavior	High-speed bearings and precision rolling assemblies

Manufacturing & Process Control

SDBALLS controls phosphor bronze ball production through alloy selection, blank preparation, forming, flashing, grinding or lapping when required, polishing, cleaning, passivation or surface conditioning, inspection and export packing. For customized projects, the process can be adjusted according to diameter, precision grade, surface finish, application and packing requirements.

Because phosphor bronze is softer than hardened bearing steel, surface handling and final cleaning are important. Production control should focus on roundness, dimensional stability, surface marks, cleanliness, passivated condition and correct alloy identification.

Quality Control & Inspection

Typical inspection items include diameter, precision grade, roundness, surface appearance, hardness, alloy confirmation, surface condition, packing condition and quantity verification. For OEM projects, SDBALLS can discuss inspection reports, sample approval, third-party testing, RoHS requests, material certificates, customized labeling and batch traceability requirements.

• Diameter and grade inspection according to agreed tolerance requirements.
• Surface appearance inspection for scratches, dents, stains and contamination.
• Hardness check when specified by the buyer or drawing.
• Material and alloy confirmation for CuSn5, CuSn6, CuSn8 or equivalent grades.
• Packing inspection for export shipment, distributor stock or OEM assembly use.

Packing Options

Phosphor bronze balls can be supplied in bulk bags, cartons, plastic pails, drums, palletized export packing or customized OEM packaging. For precision parts, small-diameter balls, distributor orders or electromechanical assembly use, inner packaging and labeling can be adjusted to protect the surface and simplify receiving inspection.

How to Specify for Quotation

To quote accurately, please confirm the following information:

• Material grade or alloy family: CuSn5, CuSn6, CuSn8, C51000, C51900, C52100 or equivalent.
• Diameter in mm or inch and required precision grade.
• Hardness or temper/condition requirement if specified by drawing.
• Surface finish: polished, passivated, cleaned or special finish.
• Application and working medium, especially for valves, pumps or chemical contact.
• Magnetism, conductivity or corrosion requirement if critical.
• Quantity, packing method, labeling requirement and delivery schedule.
• Inspection documents, material certificate, RoHS or third-party test requirements.
• Destination port and trade term, such as FOB, CIF, DAP or DDP.

Technical FAQ

В: Для чего используются шарики из фосфорной бронзы?

A: They are commonly used in electric conductors, electromechanical contacts, special valves and pumps, check valves, special bearings, instruments and mechanical assemblies requiring wear resistance, corrosion resistance, conductivity and non-magnetic behavior.

Q: What is the difference between phosphor bronze balls and pure copper balls?

A: Pure copper balls offer higher electrical conductivity and better softness/formability. Phosphor bronze balls contain tin and phosphorus, so they provide better strength, wear resistance and fatigue performance, but lower conductivity than pure copper.

Q: Are phosphor bronze balls magnetic?

A: No. Phosphor bronze is a copper alloy and is generally non-magnetic, making it suitable for instruments, electromechanical parts and applications where magnetic interference should be avoided.

Q: Are phosphor bronze balls corrosion resistant?

A: They have good corrosion resistance in water, steam, mineral oils and petrol. They are not recommended for acids, alkalis or aggressive chemical media unless compatibility is confirmed by testing or engineering evaluation.

Q: What alloy types can SDBALLS supply?

A: Common phosphor bronze alloy families include CuSn5, CuSn6 and CuSn8, with international equivalents such as C51000, C51900 and C52100. Final selection should follow the drawing, standard or application requirement.

Q: What hardness range is available?

A: Typical hardness is HRB 75-105 depending on alloy and production condition. If a narrow hardness range is required, it should be confirmed before quotation and sample approval.

Q: Can phosphor bronze balls be used in bearings?

A: They can be used in special bearings or low-friction contact parts where bronze alloy properties are required. They are not a replacement for high-speed precision bearing steel balls such as AISI 52100 chrome steel balls.

Q: What information is needed for a quotation?

A: Please provide alloy grade, diameter, precision grade, hardness or condition if required, surface finish, application, working medium, quantity, packing, inspection documents, destination and trade term.