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New lead-free copper alloys (Kurika Bronze) [KURIMOTO, LTD.]

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New lead-free copper alloys (Kurika Bronze)

【Special Permit No.3946244】

Features

  • Reduces defects during casting (compared to our company's products)
  • Inclusion of nickel is excellent for pressure resistance. Suitable for thick-walled cast metal as well.
  • Casting design is made possible by conforming to JIS H5120 CAC406 standards
  • Through the balance of Ni-P-Sn levels, has excellent machinability and workability through the balancing of Ni-P-Sn levels
  • Environmentally-friendly chemical components. (Selenium, Antimony-free copper alloy)
  • Mechanical properties conform to JIS H5120 CAC406 standards

Chemical Components

1.5 to 3.0 nickel is added to Cu-Sn-Zn-Bi-P

Graph 1 Major Chemical Components (by wt%)

TypeNiSnZnBiPPbCu
KURIKA BRONZE Ingot
JIS H2202 CACIn904
1.5-2.5 3.0-5.0 6.0-9.0 1.0-2.0 ≦0.03 ≦0.1 Bal.
KURIKA BRONZE Casting
JIS H5120 CAC904
1.5-2.5 3.0-5.0 6.0-9.0 1.0-2.0 ≦0.05 ≦0.25 Bal.
KURIKA BRONZE
Continuous Casting
JIS H5120 CAC904C
1.5-2.5 3.0-5.0 6.0-9.0 1.0-2.0 ≦0.5 ≦0.25 Bal.
CDA C89845 1.5-2.5 3.0-5.0 6.0-9.0 1.0-2.0 ≦0.05 ≦0.09 Bal.
Chemical Composition
Example
1.7 4.0 7.0 1.7 ≦0.05 ≦0.25 Bal.

Mechanical Properties

Mechanical properties conform to CAC406.

Machinability

  • Concerning the machinability coefficient, on the condition that of CAC406 is 100, the Kurika Bronze is from 80 to 90.
  • The superior Machinability, because of Bi-Ni compound-containing.
  • Chip Shapes are fine, and conventional machining method could be applied.
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CAC406C
Cutting chip formation

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Kurika Bronze
Cutting chip formation

Why the inclusion of Ni?

With the inclusion of Ni, Ni-Sn compounds and Ni-P compounds are generated around the Bi atoms, thus improving pressure resistance and cutting performance.

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