Lead-Free Brass
What is Pb Free Brass/Lead-Free Brass?
- - Brass with its lead content less than 0.25% is called Pb Free Brass/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 Pb Free Brass/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 Pb Free Brass/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 Pb Free Brass/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 |