MEI 65
Overview
MEI-65 (Yellow Brass) is the major brass alloy for cold forming processes. Its excellent forming properties satisfy the demands of many industrial
applications, making it the most widely used brass strip for connectors, springs and stamped components.
| CHEMICAL COMPOSITION (wt. %) | ALLOY DESIGNATIONS | COIL / SHEET SPECIFICATIONS | |||
|---|---|---|---|---|---|
| Element | Composition (%) | Standard | Designation | Specification | Range |
| Cu | 64.00 – 66.00 | IS | IS 410 | Thickness (mm) | 0.04 – 3.0 |
| Fe | ≤0.05 | JIS | C2680 | Width (mm) | 6.00 – 406 |
| Pb | ≤0.05 | ISO | CuZn35 | Inner Dia. (mm) | 100/150/200/300 0/400/500 |
| Ni | ≤0.10 | ASTM | C27000 | Coil Wt. (kg/mm) | 1.0 – 4.0 |
| Zn | Rem. | BS | CZ107 | 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 | 60–75 | 285–340 | ≤170 | ≥45 | 0.035–0.100 |
| 1/4 Hard | H01 | 75–90 | 340–370 | ≥170 | ≥40 | 0.015–0.050 |
| 1/2 Hard | H02 | 95–125 | 390–450 | ≥220 | ≥28 | ≤0.015 |
| 3/4 Hard | H03 | 125–145 | 440–490 | ≥370 | ≥10 | ≤0.010 |
| Hard | H04 | 140–160 | 480–550 | ≥410 | ≥5 | ≤0.010 |
| Extra Hard | H06 | 160–185 | 540–630 | ≥460 | — | ≤0.005 |
| Spring Hard | H08 | ≥185 | ≥630 | ≥550 | — | ≤0.005 |
| 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) |
| 8.47 | 27 | 116 | 110 | 380 |
| FABRICATION PROPERTIES | |||
|---|---|---|---|
| Fabrication Property | Rating | Fabrication Property | Rating |
| Capacity for Cold Working | Excellent | Soft Soldering | Excellent |
| Machinability | Fair | Resistance Welding | Good |
| Electroplating | Excellent | Gas Shielded Arc Welding | Fair |
| Hot Dip Tinning | Excellent | Laser Welding | Less suitable |
| CORROSION RESISTANCE |
|---|
|
MEI-65 has good corrosion resistance to water, water vapor, different saline solutions, many organic liquids, land, sea and industrial atmosphere. Not resistant to acids, hydrous sulphur compounds or hydrous ammonia in non-stress relieved conditions. Heat treatment can help avoid stress corrosion cracking.
|
| TYPICAL APPLICATIONS | |
|---|---|
| • Radiator cores and tanks | • Socket shells, flashlight shells, lamp fixtures, reflectors |
| • Springs, chain and bead chain | • Connectors and stamped parts |