BS1400 CMA1 - Copper Alloys

A high manganese aluminium bronze containing 13% manganese, 8% aluminium and 3% iron and nickel. The alloy conforms to BS1400 CMA1 CuMn13Al8Fe3Ni3 and BS EN 1982-2008 CC212E CuMn11Al8Fe3Ni3-C. This alloy has excellent corrosion resistance and can be used in acidic mine waters containing ferric chloride and also for general sea water applications. CMA1 has high mechanical strength and also good resistance to oxidation at elevated temperatures.

Equivalent Specifications

BS 1400 CMA1
ASTM B 505 C95700
ASTM B 148 C95700

Key Features

This alloy was mainly developed for the marine propeller industry, where its resistance to erosion and cavitational corrosion exceeded other aluminium bronzes. Has comparable strength and fatigue properties to some of the Nickel Aluminium bronzes but exhibits superior impact strength.

Typical Uses

Bearings or marine components requiring good sea water corrosion resistance, high strength and impact properties. Widely used for ship propellers and associated equipment such as shaft bearings and sleeves.

Description	Copper Manganese Aluminium
Nominal Composition	CuMn13Al8Fe3Ni3
Alloy Type	cast

Typical Mechanical Properties

Tensile Strength (N/mm²)	560
Proof/Yield Strength (N/mm²)	300
Elongation (%)	8
Hardness Brinell	180
Impact Izod J20°C	41

Typical Physical Properties

Density g/cm³	7.5
Melting Temperature Range °C	950 - 990
Thermal Conductivity W/mK	14
Electrical Resistivity μΩ.m15°C	0.58
Coefficient of Thermal Expansion 0-250°C	19
Relative Magnetic Permeability
Coefficient of Friction

Copper Alloys has the ability to modify existing alloys for improved performance. Many customers have benefited from this in the past.

To discuss your requirements, call a member of Copper Alloys’s technical team on +44 (0) 1782-816888, or email [email protected].

This Data is indicative only and must not be seen as a substitute for the full specification from which it is drawn. In particular, the mechanical property requirements vary widely with tempeter, product and product dimensions. The information is based on our present knowledge and is given in good faith. However, no liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon.

As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose.

Any advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. Any contract between the Company and a customer will be subject to the Company’s Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions, a copy of which is available on request.