28
Cu
Copper
%57,0–59,0
CuZn37Mn3Al2Si
CuZn37Mn3Al2PbSi-C | KUZRAL® 3 | High-Strength Special Brass / Manganese Bronze
KUZRAL® 3 is a high-strength, wear-resistant special brass / manganese bronze product based on the CuZn37Mn3Al2PbSi / CW713R chemistry. The -C suffix identifies Çorum Bronz’s commercial cast supply form, while CW713R is the standard wrought-alloy reference.
- Commercial product
- CuZn37Mn3Al2PbSi-C / KUZRAL® 3
- EN wrought alloy
- CuZn37Mn3Al2PbSi / CW713R
- Former DIN
- CuZn40Al2 / 2.0550
- Product standards
- EN 12164 / 12165 / 12167 / 12168 / 12449 / 12420
- Close grades
- UNS C67400 / C67420; former BS CZ135 (not exact equivalents)
- Density
- 8.12 g/cm³
01. Chemical Composition (%)
25
Mn
Manganese
%1,5–3,0
13
Al
Aluminium
%1,3–2,3
14
Si
Silicon
%0,3–1,3
82
Pb
Lead
%0,2–0,8
26
Fe
Iron
%1,0 Max
28
Ni
Nickel
%1,0 Max
50
Sn
Tin
%0,4 Max
30
Zn
Zinc
Kalan
02. Mechanical Properties
| Property | Unit | Value | Test Method |
|---|---|---|---|
| Tensile Strength Rm | MPa | Rods: R540 ≥540; R590 ≥590 | EN 12164; by product size and condition |
| 0.2% Proof Strength Rp0.2 | MPa | R540 approx. 280; R590 approx. 320-370 | Reference value; depends on product form and standard |
| Elongation A | % | R540 ≥15; R590 ≥10 | EN 12164 / EN 12168; by section and condition |
| Hardness | HB | H130: 130-170; H150: 150-220 | Alternative hardness condition; by product form |
| Density | g/cm³ | approximately 8.12 | Typical physical value; not a guaranteed standard value |
03. Applications
- Wear-resistant bronze bushings
- Plain bearings and sliding elements
- Valve guides
- Synchroniser rings
- Transmission and drivetrain components
- Piston rings
- Gears and motion-transfer components
- Hot-pressed and forged parts
- Pins, rivets and fasteners
- General machine and vehicle construction parts
04. Manufacturing Technology and Supply Forms
Manufacturing TechnologyStandard CW713R products are manufactured as rods, profiles, hollow rods, tubes, forging stock and forgings by extrusion, drawing and hot forming. KUZRAL® 3 may also be supplied as project-specific cast and machined large sections; this commercial production route is evaluated separately from the EN wrought-alloy classification.
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 CuZn37Mn3Al2PbSi-C?
KUZRAL® 3 is a high-strength special brass / manganese bronze product based on the CuZn37Mn3Al2PbSi chemistry. The international EN wrought-alloy designation is CuZn37Mn3Al2PbSi / CW713R. The -C suffix used in the page title is Çorum Bronz’s commercial designation for its special cast and machined supply form.
Chemical Composition
CW713R contains 57.0-59.0% Cu, 1.5-3.0% Mn, 1.3-2.3% Al, 0.3-1.3% Si and 0.2-0.8% Pb, with Zn as the remainder. Fe and Ni are limited to 1.0%, Sn to 0.4% and total other elements to 0.3%. Composition is confirmed against the purchase specification and material certificate.
Mechanical Properties
Mechanical properties depend on product form, section and the specified R or H condition. Typical EN 12164 rod conditions include R540 with a minimum tensile strength of 540 MPa and elongation of 15%, and R590 with 590 MPa and 10%. Rp0.2 reference values are approximately 280 MPa for R540 and 320-370 MPa for R590 depending on product form. H130 and H150 represent typical hardness ranges of 130-170 HB and 150-220 HB.
Typical Physical Properties
Typical references include a density of 8.12 g/cm³, thermal conductivity of about 63 W/(m·K), specific heat of about 0.377 J/(g·K), thermal expansion of about 19.5-20.3 × 10⁻⁶/K and electrical conductivity of about 7.8-8.0 MS/m. These values depend on material condition.
Material Behaviour
Manganese, aluminium and silicon support strength and wear resistance. Hard intermetallic phases in the structure contribute to sliding and friction performance. The alloy has very good hot-forming capability, limited cold formability and moderate machinability.
Corrosion Behaviour
CuZn37Mn3Al2PbSi performs well in atmospheric exposure, neutral and alkaline media, fresh water, suitable seawater conditions and oils. Chloride level, water hardness, ammonia, amines, stress condition and operating temperature should be included in the project assessment.
Applications
Typical applications include bronze bushings, plain bearings and sliding elements, valve guides, synchroniser rings, transmission parts, piston rings, gears, motion-transfer components, hot-pressed parts, pins and general machine-construction components.
Production Technology and Supply Forms
CW713R is supplied as solid round and hexagonal rods, flats, rectangular bars, profiles, hollow rods, seamless tubes, forging stock and forgings. Project-specific KUZRAL® 3 supply may include special castings, machined large sections, bushing blanks and drawing-based components.
Production, Sales and Supply by Çorum Bronz
Çorum Bronz manufactures and supplies KUZRAL® 3 products with project-specific dimensions, tolerances, product forms and quality documentation. Chemical analysis, mechanical condition, manufacturing route and final service conditions are evaluated together during material selection.
Standards and Comparable Grades
The main EN designation is CuZn37Mn3Al2PbSi / CW713R, with CuZn40Al2 / 2.0550 as the former DIN designation. Depending on product form, EN 12164, EN 12165, EN 12167, EN 12168, EN 12449 and EN 12420 apply. UNS C67400, C67420 and former BS CZ135 are close comparisons; chemistry, mechanical condition and product form require joint verification for substitution.
Engineering Note
Final material selection should consider load, speed, lubrication, mating-surface hardness, temperature, corrosion environment, section and manufacturing route. Acceptance values for cast KUZRAL® 3 products are defined by the purchase specification, specimen plan and material certificate.