Cartridge Brass 70/30[Cu/Zn]

This is a type of 70/30 Brass that is widely being used for defense applications.
Alloy Names (as per RoHS specifications)
DIN CEN/TS 13388 CW505L
UNS C26000
JIS C26000
Chemical Composition Weight percentage
Copper [Cu] 68.5 % to 71.5%
Total Impurities 0.05% Max.
Zinc [Zn] Remainder
  • Outstanding deep drawing properties therefore widely used in defence application.
  • Good forming properties & mechanical strength.
Main Applications
Defence : cartridge below bullet envelop for storing propellant, mechanical housings for lighters, mechanical housings for ammunition, ammunition.
Electrical: Terminal Connecto, Flashlight Shells, Lamp Fixtures and Reflectors.
Consumer : Costume designed Watch parts,Jewellery, Buttons, Chains,Hardware handles,Lock, snaps, planters, fireplace screens, etched articles, bird cages, coinage, chain links, pen/pencil inserts and clips, syringe parts, shells, electrical sockets, lamps.
Industrial: air pressure conveyer systems, sound proofing equipment, springs, chain, bead chain, tubing for instruments and machines, heat exchangers, pump cylinders, wire screens, pumps, liners, power cylinders.


Melting Point - Liquidus 954 °C
Melting Point - Solidus 916 °C
Densithy 8.53 gm/cm³ at 20 °C
Specific Gravity 8.53
Electrical Conductivity 0.162 MegaSiemens/cm at 20 °C
Thermal Conductivity 121.2 W/m at 20 °C
Coefficient of Thermal Expansion 19.2 . 10‾⁶ per °C (20°-300° C
Specific Heat Capacity 377.1 J/kg at 293 °C
Modulus of Elasticity in Tension 110317 Mpa
Modulus of Rigidity 41369 Mpa
Physical Properties Provided by CDA
Temper Tensile Strength Rm Mpa(N/mm2) Yield Strength Rp0.2 MPa(N/mm2) Elongation Minimum A50mm % Hardness HV
O (Soft) 280 Min < 160 50 Min 80 Max
HA (Quarter Hard) 325 Min iY 170 35 Min 75 Min
HB (Half Hard) 325 Min iY 200 20 Min 100 Min
HD (Hard) 415 Min iY 260 5 Min 125 Min
HE (Extra Hard) 522 Min iY 400 165 Min
Joining Technique Suitability
Soldering Excellent
Brazing Excellent
Oxyacetylene Welding Good
Gas Shielded Arc Welding Good
Coated Metal Arc Welding Not Recommended
Spot Weld Fair
Seam Weld Not Recommended
Butt Weld Good
Capacity for Being Cold Worked Excellent
Capacity for Being Hot Formed Fair
Fabrication Properties Provided by CDA

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