Tin Bronze – Materials and norms

Material

Bronze
Brass
Copper
Cast Iron
Aluminum

Tin Bronze

Tin bronze, also known as phosphor bronze, contains between 0.5 and 11% tin and 0.01 to 0.35% phosphorus. Alloyed tin increases the corrosion resistance and strength of copper, while phosphorus increases its wear resistance and stiffness.

Another type of bronze is gunmetal, also known as red bronze. It contains lead and zinc surcharges which improve its machining qualities.

Tin bronze is used for springs, screws, bushings, bearings, electrical switches with moving or sliding parts, gearboxes, pump components, piston rings, propellers, wind instruments, etc. It is also used in cryogenics as it combines good electrical and low thermal conductivity.

We supply bronze in the form of bars (round, flat, square, hexagonal, hollow) and tubes.

Below you will find a selection of the most common material grades we work with. Notice for the EN 1982 standard: We usually use the prefix CC (e.g., CC492K), which denotes castings, but you may encounter the prefix CB (e.g., CB492K) elsewhere, indicating ingots. The prefix CW denotes wrought alloys.

If you are interested in another grade or alloy, do not hesitate to contact us.

Grade

ČSN

DIN

ASTM (UNS)

GOST

Afnor

CuSn3Pb7Zn9

CC490K

C84400

CuSn3Pb7Zn9

CuSn3Pb7Zn9 (CB490K) is characterized by excellent mechanical properties and resistance to wear and corrosion. This alloy contains approximately 3% tin, 7% lead, and 9% zinc, combining strength, wear and corrosion resistance, and machinability. Its tensile strength ranges between 180–220 MPa and hardness reaches 60–70 HB, ensuring reliable performance even in demanding operating conditions. CuSn3Pb7Zn9 (CB490K) is suitable for manufacturing components exposed to high mechanical stress and requiring long-term durability: valves, pumps, plain bearings, marine shafts, gears, and electrical contacts.

CuSn5Zn5Pb2

CC499K

CuSn5Zn5Pb2

CuSn5Zn5Pb5

CC491K

17656

C83600

Br O5C5S5

CuSn5Zn5Pb5

CuSn5Zn5Pb5 can be classified somewhere between tin and lead bronze and it is also known under the name Rg5 or as red bronze. This alloy has good casting, machining and soldering properties. It is used in production of normal duty pump housings, water or steam fittings, low-pressure valves, gate valves, small gears, thin-walled castings, bushings, grommets, bearings, etc.

Chemical composition

Cu	Sn	P	Zn	Fe	Ni	Pb
83.00–87.00	4.00–6.00	≤ 0.10	4.00–6.00	≤ 0.30	≤ 2.00	4.00–6.00

Mechanical Properties

Temper	Hardness – HB	Tensile strength – R_m min. [MPa]	Yield strength – R_p0.2[MPa]	Elongation – A min. [%]
GZ	65	250	110	13
GC	65	250	110	13

CuSn6

423016 (423116)

CW452K

2.1020

C51900

BrOF6,5-0,15

CuSn6P

CuSn6

CuSn6 offers an excellent combination of strength, hardness and cold formability. This alloy also has good corrosion resistance and soldering properties. It is used in springs, for tubes where flexibility is needed (e.g. as a Bourdoun tube in pressure gauges), in small metal products, for metal fabric or for wires or knives for paper mills.

Chemical composition

Cu	Sn	P	Zn	Fe	Ni	Pb
rest	5.50–7.00	0.01–0.40	≤ 0.20	≤ 0.10	≤ 0.20	≤ 0.02

Mechanical Properties

Temper	Hardness – HB	Tensile strength – R_m min. [MPa]	Yield strength – R_p0.2[MPa]	Elongation – A min. [%]
M	as manufactured	as manufactured	as manufactured	as manufactured
R470	150	470	360	10
R400	120	400	200	30
H160	160–190	–	–	–
H180	180-210	–	–	–

CuSn6Zn4Pb2

CC498K

CuSn6Zn4Pb2

CuSn7Zn4Pb3

CC492K

CuSn7Zn4Pb3

CuSn7Zn4Pb7

423037 (423137)

CC493K

2.1090

C93200

CuSn7Pb6Zn4

CuSn7Zn4Pb7

CuSn7Zn4Pb7 can be classified somewhere between tin and lead bronze and it is also known under the trivial name Rg7 or as red bronze. It is one of the most popular bronze alloys because it can be used in various machine parts. CuSn7Zn4Pb7 is a medium-hardness material and it works well under emergency conditions. It has very good machining, welding and soldering properties. It is used for bearings in various engineering branches, medium duty sliding plates and rails, piston pin bushes, connecting rods, gears, etc.

Chemical composition

Cu	Sn	P	Zn	Fe	Ni	Pb
81.00–85.00	6.00–8.00	≤ 0.10	2.00–5.00	≤ 0.20	≤ 2.00	5.00–8.00

Mechanical Properties

Temper	Hardness – HB	Tensile strength – R_m min. [MPa]	Yield strength – R_p0.2[MPa]	Elongation – A min. [%]
GZ	70	260	120	12
GC	70	260	120	12

CuSn8

423018 (423118)

CW453K

2.1030

C52100

BrOF8,0-0,3

CuSn8P

CuSn8

Due to its high strength and good corrosion resistance (better than CuSn6), alloy CuSn8 can be used in production of various machines. Thanks to its sliding properties, it is particularly suitable for bearing and guide bushings for pumps or machining tools. It is also used in production of springs, bolts, couplings, connectors, fuses, paper net warps, art objects, etc.

Chemical composition

Cu	Sn	P	Zn	Fe	Ni	Pb
rest	7.00–9.00	0.01–0.40	≤ 0.20	≤ 0.10	≤ 0.20	≤ 0.02

Mechanical Properties

Temper	Hardness – HB	Tensile strength – R_m min. [MPa]	Yield strength – R_p0.2[MPa]	Elongation – A min. [%]
M	as manufactured	as manufactured	as manufactured	as manufactured
R390	155	390	280	45
R450	125	450	280	26
R550	–	550	400	16
tube
M	as manufactured	as manufactured	as manufactured	as manufactured
R450	–	450	250	25

CuSn8P

CC459K

CuSn8P

CuSn10

423019 (423119)

CC480K

2.1050

C90700

CuSn8

CuSn10

CuSn10 alloy exhibits higher resistance than CuSn8 and it is thus suitable for components exposed to friction under high pressure (up to 300°C), such as impellers in pumps, clamping (pressure) nuts, plain bearings of machine tools and gearboxes, components for chemical appliances or centrifuges, etc.

Chemical composition

Cu	Sn	P	Zn	Fe	Ni	Pb
88.00–90.00	9.00–11.00	≤ 0.20	≤ 0.50	≤ 0.10	≤ 2.00	≤ 1.00

Mechanical Properties

Temper	Hardness – HB	Tensile strength – R_m min. [MPa]	Yield strength – R_p0.2[MPa]	Elongation – A min. [%]
GZ	80	280	170	10
GC	80	280	160	10

CuSn10Zn2

423138

C90500

Br010C2

CuSn10Zn2

CuSn10Zn2 resists hard water well, so it is used in plain bearings and couplings that are not exposed to another high loads.

Chemical composition

Cu	Sn	P	Zn	Fe	Ni	Pb	Al	Sb
rest	9.50–10.50	≤ 0.10	1.75–2.75	≤ 0.15	≤ 1.00	≤ 1.50	≤ 0.01	≤ 0.10

Mechanical Properties

Temper	Hardness – HB	Tensile strength – R_m min. [MPa]	Yield strength – R_p0.2[MPa]	Elongation – A min. [%]
R240	64	240	120	12
R280	80	280	140	15

CuSn11Pb2

CC482K

2.1061

C92700

CuSn11Pb2

CuSn11Pb2 alloy exhibits similar properties as CuSn10, but thanks to lead surcharge, it offers better machinability and sliding properties. Therefore, it is suitable for bearings and slide rails.

Chemical composition

Cu	Sn	P	Zn	Fe	Ni	Pb	Al	Mn	S	Sb	Si
83.50–87.00	10.50–12.50	≤ 4.00	≤ 2.00	≤ 0.20	≤ 2.00	≤ 0.7–2.50	≤ 0.01	≤ 0.20	≤0.08	≤ 0.20	≤0.01

Mechanical Properties

Temper	Hardness – HB	Tensile strength – R_m min. [MPa]	Yield strength – R_p0.2[MPa]	Elongation – A min. [%]
GC	90	280	150	5
GZ	90	280	150	5

CuSn12

423123

CC483K

2.1052

C91700

CuSn12P

CuSn12

CuSn12 alloy is characterized by strength, hardness and high resistance to corrosion, impacts and cavitation. It therefore works well in components that are exposed to heavy loads, friction and pressure. It is therefore used for bearing housings, gear rings, pressure nuts, gears, impellers and guide wheels, pump seats, bearing shells and linings, flanges or rings.

Chemical composition

Cu	Sn	P	Zn	Fe	Ni	Pb
85.00–88.50	11.00–13.00	≤ 0.60	≤ 0.50	≤ 0.20	≤ 2.00	≤ 0.70

Mechanical Properties

Temper	Hardness – HB	Tensile strength – R_m min. [MPa]	Yield strength – R_p0.2[MPa]	Elongation – A min. [%]
GC	90	300	150	6
GZ	90	280	150	5

CuSn12Ni

CC484K

2.1060

CuSn12Ni

CuSn12Ni is equivalent to CuSn12Ni2. Thanks to nickel surcharge, this alloy exhibits higher hardness and corrosion resistance. It is recommended for gearbox housings, gears or bearings that work under heavy loads but at relatively low speeds.

Chemical composition

Cu	Sn	P	Zn	Fe	Ni	Pb	Al	Mn	S	Sb	Si
84.50–87.50	11.00–13.00	0.05–0.40	≤0.40	≤ 0.20	1.50– 2.50	≤ 0.30	≤ 0.01	≤ 0.20	≤0.05	≤ 0.10	≤0.01

Mechanical Properties

Temper	Hardness – HB	Tensile strength – R_m min. [MPa]	Yield strength – R_p0.2[MPa]	Elongation – A min. [%]
M	as manufactured	as manufactured	as manufactured	as manufactured
GZ	95	300	180	8
GC	95	300	180	10

CuSn12Ni2

CC484K

2.1060

C91700

CuSn12Ni2

Thanks to nickel surcharge, CuSn12Ni2 alloy exhibits higher hardness and corrosion resistance. It is recommended for gearbox housings, gears or bearings that work under heavy loads but at relatively low speeds.

Chemical composition

Cu	Sn	P	Zn	Fe	Ni	Pb	Al	Mn	S	Sb	Si
85.00–87.00	13.00–15.00	0.00–0.20	≤0.50	≤ 0.20	1	1	≤ 0.01	≤ 0.20	≤0.05	≤ 0.25	≤0.02

Mechanical Properties

Temper	Hardness – HB	Tensile strength – R_m min. [MPa]	Yield strength – R_p0.2[MPa]	Elongation – A min. [%]
GC	95	300	180	10
GZ	95	300	180	8

CuSn14

C90900

CuSn14

CuSn14 alloy is very similar to grade CuSn12. Therefore, it is characterized by strength, hardness and high resistance to corrosion, impacts and cavitation. It therefore works well in components that are exposed to heavy loads, friction and pressure. It is therefore used for bearing housings, gear rings, pressure nuts, gears, impellers and guide wheels, pump seats, bearing shells and linings, flanges or rings.

Chemical composition

85.00–87.00

12.90–15.00

0.20

≤0.50

≤ 0.20

0.15

≤ 0.01

≤ 0.20

≤0.05

0.05–0.8

≤0.01

Mechanical Properties

Hardness – HB	Tensile strength – R_m min. [MPa]	Yield strength – R_p0.2[MPa]	Elongation – A min. [%]
90	275	137	15

Tin Bronze – Materials and norms

Material

Tin Bronze

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