MEI 90

Overview

MEI-90 (Commercial Bronze) has very good cold forming characteristics with higher strength than pure copper. Good welding and brazing. Good resistance
to stress corrosion cracking and dezincification, with a warm bronze appearance ideal for decorative and electrical applications.

CHEMICAL COMPOSITION (wt. %)		ALLOY DESIGNATIONS		COIL / SHEET SPECIFICATIONS
Element	Composition (%)	Standard	Designation	Specification	Range
Cu	89.00 – 91.00	IS	IS 2768	Thickness (mm)	0.04 – 3.0
Fe	≤0.05	JIS	C2200	Width (mm)	6.00 – 406
Pb	≤0.02	ISO	CuZn10	Inner Dia. (mm)	100/150/200/300 0/400/500
Ni	≤0.10	ASTM	C22000	Coil Wt. (kg/mm)	1.0 – 4.0
Zn	Rem.	BS	CZ101	Sheet Length (m)	0.50 – 4.00

MECHANICAL PROPERTIES — typical values at 20°C
Temper	Code	HV	Tensile MPa	Yield MPa	Elong. %	Grain Size mm
Annealed	O	50–70	240–280	≤140	≥36	0.035–0.060
1/4 Hard	H01	70–90	280–320	≥200	≥20	0.015–0.045
1/2 Hard	H02	90–110	325–360	≥250	≥13	≤0.015
Hard	H04	≥110	≥350	≥290	≥4	≤0.010

PHYSICAL PROPERTIES — annealed temper at 20°C
Density (g/cm³)	Elec. Conductivity (% IACS)	Thermal Conductivity (W/m·K)	Modulus of Elasticity (GPa)	Specific Heat (J/kg·K)
8.80	43	184	124	376

FABRICATION PROPERTIES
Fabrication Property	Rating	Fabrication Property	Rating
Capacity for Cold Working	Excellent	Soft Soldering	Excellent
Machinability	Less suitable	Resistance Welding	Good
Electroplating	Excellent	Gas Shielded Arc Welding	Good
Hot Dip Tinning	Excellent	Laser Welding	Fair

CORROSION RESISTANCE
MEI-90 has good resistance to fresh water, natural or alkaline saline solutions, organic compounds and land, sea and industrial atmosphere. Less sensitive to dezincification and stress corrosion cracking. Not resistant to acids, hydrous sulphur compounds or hydrous ammonia in non-stress relieved condition.

TYPICAL APPLICATIONS
• Small arms cartridges, artillery projectile rotating bands, primer caps	• Costume jewelry and ornamental trim
• Components for the electrical industry	• Screw shells, bolts, line clamps, rivets, marine hardware