28
Cu
Copper
%78,0–82,0
CuPb10Sn10
CuSn10Pb10 | KUPTİN® PB10 | High-Leaded Tin Bronze
KUPTİN® PB10 (CuSn10Pb10-C / CC495K) is a leaded tin bronze combining good sliding behaviour, wear resistance and excellent machinability. It is used for bronze bushings, plain bearings, thrust washers and industrial bearing components where correct design and lubrication are provided and tolerance to brief lubrication deficiency is required.
- Alloy
- CuSn10Pb10
- EN
- CuSn10Pb10-C / CC495K
- Closest UNS
- C93700 / SAE 64 (not an exact equivalent)
- Former DIN
- G-CuPb10Sn / 2.1176.01
- Former BS
- LB2 (closest historical grade)
- Density
- 9.00 g/cm³
01. Chemical Composition (%)
50
Sn
Tin
%9,0–11,0
82
Pb
Lead
%8,0–11,0
30
Zn
Zinc
%2,0 Max
28
Ni
Nickel
%2,0 Max
26
Fe
Iron
%0,25 Max
25
Mn
Manganese
%0,20 Max
15
P
Phosphorus
%0,10 Max
16
S
Kükürt
%0,10 Max
51
Sb
Antimon
%0,50 Max
13
Al
Aluminium
%0,01 Max
14
Si
Silicon
%0,01 Max
02. Mechanical Properties
| Property | Unit | Value | Test Method |
|---|---|---|---|
| Tensile Strength Rm | MPa | GS ≥180; GM ≥220; GZ ≥220; GC ≥220 | EN 1982; minimum by casting process |
| 0.2% Proof Strength Rp0.2 | MPa | GS ≥80; GM ≥110; GZ ≥110; GC ≥110 | EN 1982; minimum by casting process |
| Elongation A | % | GS ≥8; GM ≥3; GZ ≥6; GC ≥8 | EN 1982; minimum by casting process |
| Hardness | HBW | GS ≥60; GM ≥65; GZ ≥70; GC ≥70 | EN 1982; minimum by casting process |
| Density | g/cm³ | approximately 9.0 | Typical value; not a guaranteed standard value |
03. Applications
- Bronze bushings and plain bearings
- Properly designed high-speed and high-surface-pressure bearings
- Thrust washers
- Guide bushes and bearing elements
- Pump bearings and suitable pump components
- Wear plates and slide guides
- Rolling-mill guides and maintenance parts
- Bearing systems exposed to vibration and minor misalignment
- Thick-walled and bimetal bearing layers
- Bearing parts for industrial, agricultural and construction machinery
04. Manufacturing Technology and Supply Forms
Manufacturing TechnologyCuSn10Pb10-C / CC495K can be produced by sand casting (GS), permanent mould casting (GM), centrifugal casting (GZ) and continuous casting (GC). Minimum mechanical properties vary by process. Final selection must consider section size, surface pressure, speed, lubrication, mating surface and operating environment.
Supply FormsHollow Bar / Pipe, Flat Bar / Plate, Round Bar
05. Standards and Comparable Grades
06. Technical Description
View Detailed Technical Description
What Is CuSn10Pb10?
CuSn10Pb10 is a high-leaded tin bronze designated CuSn10Pb10-C / CC495K for castings under EN 1982. Approximately 10% tin supports strength and wear behaviour, while approximately 10% lead improves machinability, conformability and resistance to seizure.
Chemical Composition
For CC495K castings, copper including nickel is 78.0-82.0%, tin 9.0-11.0% and lead 8.0-11.0%. Zinc and nickel are limited to 2.0% max.; iron 0.25%; manganese 0.20%; phosphorus and sulfur 0.10%; antimony 0.50%; and aluminium and silicon 0.01% max. These limits must not be used as an ingot certificate for CB495K because small differences may exist between ingot and casting compositions.
Mechanical Properties
According to EN 1982 minimums, tensile strength is at least 180 MPa for sand casting and 220 MPa for permanent mould, centrifugal and continuous casting. Rp0.2 is at least 80 MPa for sand casting and 110 MPa for the other three processes. Minimum elongation is 8% for GS, 3% for GM, 6% for GZ and 8% for GC; minimum hardness is 60, 65, 70 and 70 HBW respectively. Values relate to standard test specimens, and actual components can vary with section and casting structure.
Typical Physical Properties
Typical density is approximately 9.0 g/cm³. ISO 4382-1 gives approximately 90 GPa elastic modulus, 18 × 10⁻⁶/K thermal expansion and 47 W/(m·K) thermal conductivity for its bearing alloy. Manufacturer datasets may give values such as 54 W/(m·K), 0.376 J/(g·K) specific heat and 6 MS/m electrical conductivity. These are typical references, not guaranteed EN 1982 values.
Properties and Applications
CuSn10Pb10 provides good sliding behaviour, wear resistance, seizure resistance, conformability and excellent machinability. Typical applications include bronze bushings, plain bearings, thrust washers, guide bushes, wear plates, pump bearings, rolling-mill guides and thick-walled or bimetal bearing layers.
The lead phase can improve tolerance to short or intermittent lubrication deficiency, but the alloy should not be described generally as maintenance-free or suitable for oil-free operation. Lubrication, shaft hardness, surface finish, speed and pressure must be assessed together.
Production and Supply Forms
EN 1982 permits sand (GS), permanent mould (GM), centrifugal (GZ) and continuous casting (GC). Products may be supplied as hollow bronze bars and tubes, solid round bars, flats, plates, bushings and project-specific bronze castings. Mechanical properties should be stated for the selected casting process.
Standards and Comparable Grades
The principal European grade is CuSn10Pb10-C / CC495K, with CuSn10Pb10-B / CB495K as the related ingot grade. Former German casting grades under DIN 1716 are G-CuPb10Sn / 2.1176.01, GZ-CuPb10Sn / 2.1176.03 and GC-CuPb10Sn / 2.1176.04. Number 2.1177 belongs to the former GB-CuPb10Sn ingot grade under DIN 17656.
C93700 is a UNS alloy number, not an ASTM grade name. ASTM B505/B505M covers continuous-cast products, ASTM B271/B271M centrifugal castings and ASTM B584 sand castings. UNS C93700 / SAE 64 and BS 1400 LB2 are close historical comparisons and are not exact equivalents.
CuPb10Sn10 in ISO 4382-1:2021 is an application designation for solid and multilayer thick-walled plain bearings. Its phosphorus limit and some mechanical minimums differ from CC495K, so it should not be presented as a general EN equivalent.
Technical and Regulatory Note
The alloy contains 8-11% lead. Suitability for drinking water, food contact or regulated applications must not be claimed from the alloy name alone; the applicable product standard, certification and lead-release requirements must be checked.