28
Cu
Copper
%86,0–88,5
CuSn10Zn2
CuSn10Zn2 | RG10 Tin-Zinc Bronze | Historical ISO 1338 CuSn10Zn2
KUPTİN® R10 (CuSn10Zn2) is a cast tin-zinc bronze used for plain bearings, bronze bushings, gears, pump and valve components operating under heavy loads and low sliding speeds.
- Alloy
- CuSn10Zn2
- Historical ISO
- ISO 1338:1977
- Former DIN
- G-CuSn10Zn / 2.1086.01
- UNS
- C90500 (comparable grade)
- ASTM
- B505/B505M; B271/B271M
- Density
- 8.7 g/cm³
01. Chemical Composition (%)
50
Sn
Tin
%9,2–11,0
30
Zn
Zinc
%1,0–3,0
82
Pb
Lead
%1,30 Max
28
Ni
Nickel
%2,00 Max
26
Fe
Iron
%0,20 Max
15
P
Phosphorus
%0,03 Max
25
Mn
Manganese
%0,20 Max
51
Sb
Antimon
%0,30 Max
16
S
Kükürt
%0,10 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 | Sand (G) ≥260; Centrifugal (GZ) ≥280; Continuous (GC) ≥280 | Former DIN / manufacturer reference |
| Proof Strength Rp0.2 | MPa | Sand (G) ≥130; Centrifugal (GZ) ≥150; Continuous (GC) ≥140 | Former DIN / manufacturer reference |
| Elongation A | % | Sand (G) ≥15; Centrifugal (GZ) ≥5; Continuous (GC) ≥8 | Former DIN / manufacturer reference |
| Hardness | HBW | Sand (G) ≥75; Centrifugal (GZ) ≥95; Continuous (GC) ≥90 | Former DIN / manufacturer reference |
| Density | g/cm³ | approx. 8.7 | Typical value |
03. Applications
- Heavy-duty plain bearings
- Bronze bushings and shaft bearings
- Worm wheels
- Gears and gearbox components
- Loaded shaft and spindle nuts
- Guide, slide and wear plates
- Pump housings and impellers
- Valve bodies and fitting components
- Low-speed, heavily loaded sliding elements
- Custom machine components to technical drawings
04. Manufacturing Technology and Supply Forms
Manufacturing TechnologyCentrifugal casting, continuous casting, sand casting and project-specific casting; the process is selected according to product form, dimensions, part geometry, service conditions and the order specification.
Supply FormsCustom Casting, Hollow Bar / Pipe, Flat Bar / Plate, Round Bar
05. Standards and Comparable Grades
06. Technical Description
View Detailed Technical Description
What Is CuSn10Zn2?
CuSn10Zn2 is a copper-based cast tin-zinc bronze containing approximately 9.2-11% tin and 1-3% zinc. Tin contributes hardness, wear resistance and load-carrying capacity, while zinc supports castability and production behaviour. The alloy is considered particularly for suitably lubricated sliding applications combining heavy loads with low sliding speeds.
Chemical Composition
In the historical ISO 1338:1977 reference, CuSn10Zn2 contains 86.0-88.5% Cu, 9.2-11.0% Sn and 1.0-3.0% Zn. Maximum limits are 1.30% Pb, 2.00% Ni, 0.20% Fe and Mn, 0.03% P, 0.30% Sb, 0.10% S, and 0.01% Al and Si. Because some former standards and commercial tables may count nickel as copper, the Cu/Ni calculation method must be confirmed against the order specification or product analysis certificate.
Mechanical and Typical Physical Properties
Former DIN and manufacturer data sheets report minimum values for sand casting of 260 MPa tensile strength, 130 MPa proof strength, 15% elongation and 75 HBW; for centrifugal casting, respectively 280 MPa, 150 MPa, 5% and 95 HBW; and for continuous casting, 280 MPa, 140 MPa, 8% and 90 HBW. These values do not come from one current EN or ISO table; they are process-specific minimums compiled from different historical and commercial references.
Typical values are approximately 8.7 g/cm³ density, 0.370 J/(g·K) specific heat, 18.0 × 10⁻⁶/K coefficient of thermal expansion, 71 W/(m·K) thermal conductivity and 8.5 MS/m electrical conductivity. Physical properties are typical references and must not be treated as guaranteed product values.
Properties and Applications
CuSn10Zn2 offers good castability, wear resistance, compressive load capacity and suitable corrosion performance. Principal applications include heavy-duty plain bearings, bronze bushings, worm wheels, gears, spindle nuts, guide and wear plates, pump housings and impellers, and valve and fitting components.
The alloy must not be assumed to be inherently self-lubricating. Lubricant selection must be evaluated together with counterface hardness and finish, operating clearance, load, speed, temperature and environmental conditions. For seawater or specific chemical environments, final material selection must consider flow velocity, temperature and mating materials.
Production and Supply Forms
KUPTİN® R10 can be produced by centrifugal casting, continuous casting, sand casting and project-specific casting. The process is selected according to product form, dimensions, part geometry, required mechanical properties, service conditions and the order specification.
The alloy can be supplied as round bar, bronze bushing, tube, hollow or solid component, ring, flat bar, plate, special section and casting made to technical drawings. Final dimensions, tolerances and machining allowances should be evaluated before ordering.
Standards and Comparable Grades
No verified direct grade or material number for CuSn10Zn2 exists under the current EN 1982. Therefore, CuSn10Zn2-C and CC490K must not be used as equivalents for this alloy; CC490K is the EN material number for CuSn3Zn8Pb5-C.
The principal historical designations are CuSn10Zn2 under the withdrawn ISO 1338:1977 and G-CuSn10Zn / 2.1086.01 under former DIN 1705. GB-CuSn10Zn / 2.1087 under former DIN 17656 is an ingot designation and must not be used as the casting product grade number.
BS 1400 G1, PN B102, UNS C90500 and SAE 62 are comparable grades; they are not direct equivalents because their chemical and mechanical limits differ. ASTM B505/B505M covers continuous cast copper-alloy products and ASTM B271/B271M covers centrifugal copper-base alloy castings. These ASTM numbers are product specifications, not alloy names, and must be used together with the UNS grade and product form selected for the order.
Technical Note
The values in section 02, Mechanical Properties, are process-specific minimum references taken from former DIN and manufacturer data sheets. ISO 1338:1977 is a withdrawn standard, and its general mechanical range is not the same source as the process-specific table. The chemical, mechanical and physical information is provided for general technical guidance. Final product properties must be verified against the order specification, selected reference standard, casting process, section size, dimensions, tolerances, product analysis certificate and quality-control results.