28
Cu
Copper
Kalan
ISO 428:1983 (historical; withdrawn)
CuAl10Ni5Fe4 | KUPRAL® 4 | Nickel Aluminium Bronze
KUPRAL® 4 (CuAl10Ni5Fe4 / CW307G) is a wrought nickel aluminium bronze combining high mechanical strength with wear, fatigue, seawater-corrosion and cavitation resistance. It is used for heavy-duty bushings, bearings, shafts, gears, pump and valve parts and marine components.
- Alloy
- CuAl10Ni5Fe4
- EN
- CW307G
- Former DIN
- 2.0966
- UNS
- C63000
- Aerospace
- AMS 4640
- Density
- 7.60 g/cm³
01. Chemical Composition (%)
13
Al
Aluminium
%8,5–11,0
26
Fe
Iron
%3,0–5,0
28
Ni
Nickel
%4,0–6,0
25
Mn
Manganese
%1,0 Max
14
Si
Silicon
%0,20 Max
82
Pb
Lead
%0,05 Max
30
Zn
Zinc
%0,40 Max
50
Sn
Tin
%0,10 Max
02. Mechanical Properties
| Property | Unit | Value | Test Method |
|---|---|---|---|
| Tensile Strength Rm | MPa | R680 ≥680; R740 ≥740 | EN rod conditions; depending on product size |
| 0.2% Proof Strength Rp0.2 | MPa | R680 ≥320; R740 ≥400 | EN rod conditions; depending on product size |
| Elongation A | % | R680 ≥10; R740 ≥8 | EN rod conditions; depending on product size |
| Hardness | HB | H170: 170-210; H200 ≥200 | EN hardness conditions |
| Density | g/cm³ | approximately 7.6 | Typical value; not a standard acceptance value |
03. Applications
- Heavy-duty bushings and plain bearings
- Shafts and bearing sleeves
- Gears and worm wheels
- Pump and valve components
- Hydraulic-system bushings and guides
- Slides and wear plates
- Marine fasteners
- Forged marine and propulsion components
- High-pressure oil and gas equipment
- Aerospace bushings and bearings to AMS 4640
04. Manufacturing Technology and Supply Forms
Manufacturing TechnologyCuAl10Ni5Fe4 / CW307G is a wrought alloy produced by extrusion, drawing, rolling and forging according to product form. The process, final temper, section size and mechanical requirements are selected together. CuAl10Fe5Ni5-C / CC333G under EN 1982 is a separate cast alloy.
Supply FormsHollow Bar / Pipe, Flat Bar / Plate, Round Bar
05. Standards and Comparable Grades
06. Technical Description
View Detailed Technical Description
What Is CuAl10Ni5Fe4?
CuAl10Ni5Fe4 is a high-strength wrought nickel aluminium bronze designated CW307G in the European material system. It is supplied by Çorum Bronz under the trade name KUPRAL® 4. The alloy combines high mechanical strength, wear and fatigue performance with resistance to seawater and corrosion in various industrial environments.
Chemical Composition
The EN 12163 composition specifies Cu as the remainder, Al 8.5-11.0%, Fe 3.0-5.0% and Ni 4.0-6.0%. Maximum limits are Mn 1.0%, Si 0.20%, Pb 0.05%, Zn 0.40%, Sn 0.10% and total other elements 0.20%.
Mechanical Properties by Product Form
Mechanical requirements depend on product form, temper and dimensions. Common EN rod conditions specify Rm 680 MPa minimum, Rp0.2 320 MPa minimum and elongation 10% minimum for R680; and Rm 740 MPa minimum, Rp0.2 400 MPa minimum and elongation 8% minimum for R740. Hardness conditions are 170-210 HB for H170 and 200 HB minimum for H200.
Plate products may use different conditions such as R590 and R620. A single mechanical set therefore does not apply to every product; final acceptance is based on the applicable product standard, temper, section size and EN 10204 material certificate.
Typical Physical Properties
Typical references include density around 7.6 g/cm³, modulus of elasticity around 117 GPa, specific heat around 450 J/(kg·K), thermal conductivity around 63 W/(m·K) and electrical conductivity around 4.6 MS/m. These are typical engineering references rather than guaranteed acceptance values.
Technical Characteristics and Material Selection
The protective aluminium oxide film supports corrosion performance. Nickel and iron contribute to high strength, microstructural stability, fatigue, impact and wear performance. With suitable design and counterface selection, the alloy is used where heavy loads, high contact pressure and corrosive conditions occur together.
Bearing applications consider lubrication, shaft hardness, surface finish, running clearance, pressure and sliding speed. Marine applications also consider flow velocity, temperature, galvanic contact, cavitation and project requirements.
Applications
Typical uses include heavy-duty bushings and plain bearings, shafts and bearing sleeves, gears and worm wheels, pump and valve components, hydraulic system parts, guides and wear plates, marine fasteners, forged marine components and high-pressure oil and gas equipment. Products meeting AMS 4640 requirements may be used for aerospace bearings and bushings.
Production Technology and Product Forms
CuAl10Ni5Fe4 / CW307G is produced by extrusion, drawing, rolling and forging according to product form. It can be supplied as round bar, flat bar and profile, plate, hollow bar, forging stock, rings and machined components.
CuAl10Fe5Ni5-C / CC333G is a separate cast alloy under EN 1982. CW307G and CC333G are not automatically interchangeable because their product standards, manufacturing structures and composition limits differ.
Supply by Çorum Bronz
Çorum Bronz supplies KUPRAL® 4 CuAl10Ni5Fe4 as semi-finished material or machined components according to project requirements. Available sizes, cut lengths, special sections, hollow products and drawing-based parts are assessed together with temper, tolerances, certification and service conditions.
Standards and Comparable Grades
The primary European designation is CuAl10Ni5Fe4 / CW307G, with former German material number 2.0966. UNS C63000 is a common American cross-reference, AMS 4640 is the relevant aerospace specification and CA104 is a historical British comparison. Interchangeability is confirmed against the purchase specification because these designations may have different product and acceptance requirements.
EN 12163 covers rod, EN 12167 profiles and bars, EN 12165 forging stock and EN 12420 forgings. ASTM B150/B150M covers rod, bar and shapes; ASTM B124/B124M covers rod, bar and shapes intended for hot forging; and ASTM B171/B171M covers plate and sheet for specified pressure-vessel and heat-exchanger applications. ISO 428:1983 is a historical withdrawn standard.
Engineering and Quality Note
Final conformity is verified by product form, applicable standard, temper, dimensions, chemical analysis, mechanical testing and EN 10204 inspection documentation. Marine, aerospace, pressure-equipment and elevated-temperature applications also require project-specific acceptance and inspection requirements.