Eco brass material properties

Chemical components
Eco brass Chemical components(wt％)
Cu Si Pb P Sn Fe Ni Mn Al Zn
73.0-78.0 2.7-3.4 ≦0.1 0.04-0.20 - - - - - Remaining part

Eco brass is a brass alloy that adds silicon to copper and zinc. While lead-free brass developed in the US is mainly produced by adding a heavy metal similar to lead such as bismuth, eco brass does not contain any heavy metals. (Cadmium content 0.001 or less)

Physical properties
Item Unit  
Melting point ℃ 880
Density /cm2 8.3
Thermal conductivity W/M/K 38
Conductivity ％IACS 8
Linear expansion coefficient ×10-6/℃ 20
Vertical modulus of elasticity MPa 1.05×105
Mechanical properties
Item Unit  
Cross-sectional hardness　HRB/HV5 － 89/180
Tensile strength MPa 670
Elongation ％ 32
Yield strength MPa 450
Products using eco brass:
Eco brass spacer
Eco brass features
(1) Ecological (lead-free) Compliant with lead restrictions and with environmental regulations 　 　
(2) High strength (same as stainless steel) Equivalent strength to stainless steel → Possible to reduce costs by replacing stainless steel
　 Stronger and better corrosion resistance than steel → Quality can be improved by replacing steel
(3) Same dezincification corrosion resistance as BC6 and excellent stress corrosion cracking resistance.
Mechanical strength comparison
Material Cross-sectional hardness Tensile strength Elongation Yield strength
HRB HV5 N/mm2 ％ N/mm2
Eco brass 89 180 670 32 450
C3604 67 120 420 34 240
SUS304 90 195 600 55 390
SUS303 85 175 600 56 310
SUM23L 87 180 520 19 470

Eco brass is 1.4 times stronger than C3604 and is as strong as typical stainless steels SUS304 and SUS303.
Numerical values are for φ8 (typical value).

Breaking torque-M3-Comparison by material

Note: The numeric values above are typical values. They are not standard values.