Year 2009 "Grant for supporting product development by small manufacturing businesses"Experimental results

Understanding the metal mold castability and material properties for the permanent mold casting technique used for lead-free and cadmium-free brass material-an environmentally-friendly new material-and establishing permanent mold casting mass production technology for casting parts made from this material.

This trial production experiment was planned and conducted by Kitamura Faucet utilizing government projects for supporting trial production and development.

Environmentally-friendly copper alloy material with consideration of Pb and Cd contents is already on the market.We will continue to search for beneficial methods for utilization of environmentally-friendly materials, with a focus on production method as well as on materials.

Environmentally-friendly new materials experimental results. »

Material purchase place and cooperation company.

Material names Cooperating company names
Eco-brass (CDA C87850 ECO BRASS) Mitsubishi Shindoh Co.,Ltd.
Eco-bismuth (CDA C89841 Copper-Bismuth Alloy) Joetsu Bronz1 corporation
Eco-bronze (silicon bronze) Joetsu Bronz1 corporation
BZ (CDA C49340 Bismuth Brass Alloy) SAN-ETSU METAL Co., Ltd
KEEPALLOY Brass alloy keep with no dezincing resistance (Bi-Se Yellow brass) KITZ METAL WORKS CORPORATION
KEEPALLOY Brass alloy keep with dezincing resistance (bismuth brass) KITZ METAL WORKS CORPORATION
C87800 Silicon Brass US standard material ASTM C87800 Joetsu Bronz1 corporation
Common brass for CAC203 permanent mold casting (ASTM C85700 Leaded yellow brass) -

Experimental subject, materials

Trial product: Ball for ball valve

Trial product: Ball for ball valve Trial product: Ball for ball valve

Details of trial products

Sphere diameter(A)
Φ104mm(Casting conditions)
Φ102mm(After machine processing)
Fluid passage(B)
Φ63mm(Casting conditions)
Φ65mm(After machine processing)

Thickness setting

True trial production
Raw casting t=3.8mm
After processing t= 2.5mm
Preliminary trial production
Raw casting t=4.7mm
After processing t= 3.7mm

Permanent mold casting method

Gravity permanent mold casting method

Subject materials

  • Six types of lead-free and cadmium-free brass material, which are commercially available and environmentally-friendly new materials
  • One type of lead-free, cadmium-free brass registered in US standard
  • One type of lead-free, added to subject material for comparison to common brass material commonly used in permanent mold casting
Material names Domestic standard in Japan US standard/Registered name, etc.
M1.Eco-brass (CDA C87850 ECO BRASS) JIS CAC 804 CDA C87850 ECO BRASS
M2.Eco-bismuth (CDA C89841 Copper-Bismuth Alloy) - CDA C89841 Copper-Bismuth Alloy
M3.Eco-bronze (silicon bronze) - -
M4.BZ (CDA C49340 Bismuth Brass Alloy) *JIS C6802 CDA C49340 Bismuth Brass Alloy
M5.KEEPALLOY Brass alloy keep with no dezincing resistance (Bi-Se Yellow brass) C6803 -
M6.KEEPALLOY Brass alloy keep with dezincing resistance (bismuth brass) - -
M7.C87800 Silicon Brass US standard material ASTM C87800 - ASTM C87800 Silicon Brass
M8.Common brass for YBPM Permanent mold casting (ASTM C85700 Leaded yellow brass) Equivalent to CA C203 ASTM C85700 Leaded yellow brass
*Newly standardized in JISH3250 modified on May 20, 2010.Subject materials do not have JIS certification at the time this document was prepared (July, 2010), but are indicated as JIS because JIS certification will be obtained in the future.