PRODUCT

Leed-Free Brass

무연황동
  • What is lead-Free brass?

  • - Brass with its lead content less than 0.25% is called lead-free brass. (California State Act of US AB153)
Eco-friendly regulations for the brass piping market
1. Domestic
Lead (pb) elution standard 0.001mg / L (1ppb) notified by Ministry of the Environment, Waterworks Act No. 2011-79
- Notified on May 25, 2011
- Review period expired on 2013.05.25
- Regulation started with the Enforcement Decree of Waterworks Act and Presidential Decree No. 25785
2. Overseas
Regulation of the Lead (pb) content of the material itself, not the elution standard of the material, to be not more than 0.25%.
- USA - 2010.01 AB 1953 enforced
- Japan - 2011.01 JWWA enforced
Chemical Composition Comparison of Lead-free Brass
Alloy number Cu Pb Fe Sn Si Bi Zn
C46400 59.0~62.0 0.2 or less 0.1 or less 0.5~1.0 - - Remainder
C69300 73.0~77.0 0.09 or less 0.1 or less 0.2 or less 2.7~3.4 - Remainder
C49340 60.0~63.0 0.09 or less - 0.5~1.5 - 0.5~2.0 Remainder
Mechanical Properties Comparison of Lead-free Brass
Alloy number Tensile strength (N/㎟) Yield strength (N/㎟) Elongation (%) Hardness (Hv)
C46400 345 or higher 138 or higher 30 or higher 105 ~ 152
C69300 480 or higher 205 or higher 10 or higher 110~170
C49340 335 or higher - - 80 or higher
Advantages/ Disadvantages of lead-free brass
Alloy number Advantages Disadvantages
C46400 · Low price (price ratio compared to ordinary brass 1: 1.3)
· Convenient scrap treatment (Can be mixed with ordinary brass)
· Excellent corrosion resistance. (Passed NSF corrosion test)
 
C69300 · Highly recognized.
· Excellent corrosion resistance. (Passed NSF corrosion test)
· High price (Ratio of ordinary brass price ratio 1: 2.1)
· Difficult to have sufficient supply (Direct import from Japan)
· Disadvantageous scrap treatment (Cannot be mixed with ordinary brass and returned to Japan)
C49340 · Passed lead elution regulation item (passed NSF / ANSI 61 standard) · High price (price ratio compared to ordinary brass 1: 1.5)
· Disadvantageous scrap operation (Cannot be mixed with ordinary brass
EB Brass NSF Corrosion Test Result
Alloy number Advantages Disadvantage
C46400 Resistance to dezincification PASS
Stress Corrosion Cracking in Ammonia PASS
Corrosion Resistance PASS