Loading patent…

Back to results

US 2009/0263272 A1Published application

Lead-free free-machining brass having improved castability

AssigneeToto Ltd.

InventorToru Uchida

Life of this patent

Estimating the term…

Download PDF Find prior artPrior art Similar

Abstract Drawings Claims Description

Abstract

There is provided a brass free from lead (Pb) and possessing excellent machinability, castability, mechanical properties and other properties. A brass consisting of not less than 55% by weight and not more than 75% by weight of copper (Cu), not less than 0.3% by weight and not more than 4.0% by weight of bismuth (Bi), and y % by weight of boron (B) and x % by weight of silicon (Si), y and x satisfying the following requirements: 0≦x≦2.0, 0≦y≦0.3, and y>−0.15x+0.015ab, wherein a is 0.2 when Bi is 0.3% by weight ≦Bi<0.75% by weight; 0.85 when Bi is 0.75% by weight ≦Bi<1.5% by weight; and 1 when Bi is 1.5% by weight ≦Bi≦4.0% by weight, b is 1 when the apparent content of zinc (Zn) is not less than 37% and less than 41%; and 0.75 when the apparent content of Zn is not less than 41% and not more than 45%, the balance consisting of Zn and unavoidable impurities, is excellent in castability, as well as, for example, in machinability and mechanical properties.

Claims15

Dependent claims

Claim 1A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85% · 165 words4 dependent Claim 2A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85% · 183 words5 dependent Claim 3A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85% · 193 words5 dependent Claim 4A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85% · 202 words5 dependent Claim 5A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85% · 180 words5 dependent Claim 6A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85% · 188 words5 dependent Claim 7A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85% · 197 words5 dependent Claim 8A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85% · 189 words5 dependent Claim 9A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85% · 191 words5 dependent Claim 10A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85% · 198 words5 dependent

A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85%, and consisting of:

not less than 55% by weight and not more than 75% by weight of copper (Cu),
not less than 0.3% by weight and not more than 4.0% by weight of bismuth (Bi), and
y % by weight of boron (B) and x % by weight of silicon (Si), y and x satisfying the following requirements:
0≦x≦2.0, 0≦y≦0.3, and y>−0.15x+0.015ab
wherein a is 0.2 when Bi is 0.3% by weight ≦Bi<0.75% by weight;
0.85 when Bi is 0.75% by weight ≦Bi<1.5% by weight;
and 1 when Bi is 1.5% by weight ≦Bi≦4.0% by weight, and
b is 1 when the apparent content of zinc (Zn) is not less than 37% and less than 41%;
and 0.75 when the apparent content of Zn is not less than 41% and not more than 45%, and
the balance consisting of Zn and unavoidable impurities.

7 more elements

A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85%, the brass comprising

not less than 55% by weight and not more than 75% by weight of copper (Cu),
not less than 0.3% by weight and not more than 4.0% by weight of bismuth (Bi),
not less than 0.1% by weight and less than 0.3% by weight of nickel (Ni), and
y % by weight of boron (B) and x % by weight of silicon (Si), y and x satisfying the following requirements:
(1)0<y≦0.3 when 0.05ab≦x≦0.75ab and
(2)0≦y≦0.3 when 0.75ab<x≦2.0,
wherein a is 0.2 when Bi is 0.3% by weight ≦Bi<0.75% by weight;
0.85 when Bi is 0.75% by weight ≦Bi<1.5% by weight;
and 1 when Bi is 1.5% by weight ≦Bi≦4.0% by weight, and
b is 1 when the apparent content of zinc (Zn) is not less than 37% and less than 41%;
and 0.75 when the apparent content of Zn is not less than 41% and not more than 45%, and
the balance consisting of Zn and unavoidable impurities.

9 more elements

A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85%, and consisting of:

not less than 55% by weight and not more than 75% by weight of copper (Cu),
not less than 0.3% by weight and not more than 4.0% by weight of bismuth (Bi),
not less than 0.3% by weight and less than 1.0% by weight of nickel (Ni), and
y % by weight of boron (B) and x % by weight of silicon (Si), y and x satisfying the following requirements:
(1) −0.15x+0.03ab<y≦0.3 when 0.05ab≦x≦0.2ab,
(2) 0<y≦0.3 when 0.2ab<x≦0.75ab,
(3) 0≦y≦0.3 when 0.75ab<x≦1.75ab, and
(4) 0.004x−0.007(2−ab)<y≦0.3 when 1.75ab<x≦2.0,
wherein a is 0.2 when Bi is 0.3% by weight ≦Bi<0.75% by weight;
0.85 when Bi is 0.75% by weight ≦Bi<1.5% by weight;
and 1 when Bi is 1.5% by weight ≦Bi≦4.0% by weight, and
b is 1 when the apparent content of zinc (Zn) is not less than 37% and less than 41%;
and 0.75 when the apparent content of Zn is not less than 41% and not more than 45%, and
the balance consisting of Zn and unavoidable impurities.

11 more elements

A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85%, and consisting of:

not less than 55% by weight and not more than 75% by weight of copper (Cu),
not less than 0.3% by weight and not more than 4.0% by weight of bismuth (Bi),
not less than 1.0% by weight and not more than 2.0% by weight of nickel (Ni), and
y % by weight of boron (B) and x % by weight of silicon (Si), y and x satisfying the following requirements:
(1) 0.02ab<y≦0.3 when 0.05ab≦x≦0.2ab,
(2) −0.05x+0.03ab<y≦0.3 when 0.2ab<x≦0.3ab,
(3) 0.015ab<y≦0.3 when 0.3ab<x≦0.5ab,
(4) −0.026x+0.028ab<y≦0.3 when 0.5ab<x≦1.0ab, (5) 0.011x−0.009(2−ab)<y≦0.3 when 1.0ab<x≦1.5ab, and
(6) 0.0075ab<y≦0.3 when 1.5ab<x≦2.0,
wherein a is 0.2 when Bi is 0.3% by weight ≦Bi<0.75% by weight;
0.85 when Bi is 0.75% by weight ≦Bi<1.5% by weight;
and 1 when Bi is 1.5% by weight ≦Bi≦4.0% by weight, and
b is 1 when the apparent content of zinc (Zn) is not less than 37% and less than 41%;
and 0.75 when the apparent content of Zn is not less than 41% and not more than 45%, and
the balance consisting of Zn and unavoidable impurities.

12 more elements

A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85%, and consisting of:

not less than 55% by weight and not more than 75% by weight of copper (Cu),
not less than 0.3% by weight and not more than 4.0% by weight of bismuth (Bi),
not less than 0.1% by weight and less than 0.3% by weight of aluminum (Al), and
y % by weight of boron (B) and x % by weight of silicon (Si), y and x satisfying the following requirements:
0≦y≦0.3, 0≦x≦2.0, and y>−0.15x+0.015ab
wherein a is 0.2 when Bi is 0.3% by weight ≦Bi<0.75% by weight;
0.85 when Bi is 0.75% by weight ≦Bi<1.5% by weight;
and 1 when Bi is 1.5% by weight ≦Bi≦4.0% by weight, and
b is 1 when the apparent content of zinc (Zn) is not less than 37% and less than 41%;
and 0.75 when the apparent content of Zn is not less than 41% and not more than 45%, and
the balance consisting of Zn and unavoidable impurities.

8 more elements

A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85%, and consisting of:

not less than 55% by weight and not more than 75% by weight of copper (Cu),
not less than 0.3% by weight and not more than 4.0% by weight of bismuth (Bi),
not less than 0.3% by weight and less than 1.0% by weight of aluminum (Al), and
y % by weight of boron (B) and x % by weight of silicon (Si), y and x satisfying the following requirements:
(1) −0.15x+0.015ab<y≦0.3 when 0≦x≦0.1ab,
(2)0<y≦0.3 when 0.1ab<x≦1.5ab, and
(3) 0.002x−0.003(2−ab)<y≦0.3 when 1.5ab<x≦2.0,
wherein a is 0.2 when Bi is 0.3% by weight ≦Bi<0.75% by weight;
0.85 when Bi is 0.75% by weight ≦Bi<1.5% by weight;
and 1 when Bi is 1.5% by weight ≦Bi≦4.0% by weight, and
b is 1 when the apparent content of zinc (Zn) is not less than 37% and less than 41%;
and 0.75 when the apparent content of Zn is not less than 41% and not more than 45%, and
the balance consisting of Zn and unavoidable impurities.

10 more elements

A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85%, and consisting of:

not less than 55% by weight and not more than 75% by weight of copper (Cu),
not less than 0.3% by weight and not more than 4.0% by weight of bismuth (Bi),
not less than 1.0% by weight and not more than 2.0% by weight of aluminum (Al), and
y % by weight of boron (B) and x % by weight of silicon (Si), y and x satisfying the following requirements:
(1)0.004ab<y≦0.3 when 0.05ab≦x≦0.3ab,
(2) −0.01x+0.007ab<y≦0.3 when 0.3ab<x≦0.5ab,
(3) −0.004x+0.004ab<y≦0.3 when 0.5ab<x≦1.0ab,
(4) 0.001x−0.001(2−ab)<y≦0.3 when 1.0ab<x≦1.5ab, and
(5) 0.0005ab<y≦0.3 when 1.5ab<x≦2.0,
wherein a is 0.2 when Bi is 0.3% by weight ≦Bi<0.75% by weight;
0.85 when Bi is 0.75% by weight ≦Bi<1.5% by weight;
and 1 when Bi is 1.5% by weight ≦Bi≦4.0% by weight, and
b is 1 when the apparent content of zinc (Zn) is not less than 37% and less than 41%;
and 0.75 when the apparent content of Zn is not less than 41% and not more than 45%, and
the balance consisting of Zn and unavoidable impurities.

12 more elements

A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85%, and consisting of:

not less than 55% by weight and not more than 75% by weight of copper (Cu),
not less than 0.3% by weight and not more than 4.0% by weight of bismuth (Bi),
not less than 0.1% by weight and less than 0.3% by weight of tin (Sn), and
y % by weight of boron (B) and x % by weight of silicon (Si), y and x satisfying the following requirements:
(1) −0.16x+0.02ab<y≦0.3 when 0≦x≦0.125ab,
(2) 0<y≦0.3 when 0.125ab<x≦0.4ab, and
(3) 0≦y≦0.3 when 0.4ab<x≦2.0,
wherein a is 0.2 when Bi is 0.3% by weight ≦Bi<0.75% by weight;
0.85 when Bi is 0.75% by weight ≦Bi<1.5% by weight;
and 1 when Bi is 1.5% by weight ≦Bi≦4.0% by weight, and
b is 1 when the apparent content of zinc (Zn) is not less than 37% and less than 41%;
and 0.75 when the apparent content of Zn is not less than 41% and not more than 45%, and
the balance consisting of Zn and unavoidable impurities.

10 more elements

A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85%, and consisting of:

not less than 55% by weight and less than 75% by weight of copper (Cu),
not less than 0.3% by weight and not more than 4.0% by weight of bismuth (Bi),
not less than 0.3% by weight and less than 1.5% by weight of tin (Sn), and
y % by weight of boron (B) and x % by weight of silicon (Si), y and x satisfying the following requirements:
(1) −0.08x+0.02ab<y≦0.3 when 0≦x≦0.25ab,
(2) 0<y≦0.3 when 0.25ab<x≦1.25ab,
(3)0≦y≦0.3 when 1.25ab<x≦1.75ab, and
(4) 0.002x−0.0035(2−ab)<y≦0.3 when 1.75ab<x≦2.0
wherein a is 0.2 when Bi is 0.3% by weight ≦Bi<0.75% by weight;
0.85 when Bi is 0.75% by weight ≦Bi<1.5% by weight;
and 1 when Bi is 1.5% by weight ≦Bi≦4.0% by weight, and
b is 1 when the apparent content of zinc (Zn) is not less than 37% and less than 41%;
and 0.75 when the apparent content of Zn is not less than 41% and not more than 45%, and
the balance consisting of Zn and unavoidable impurities.

11 more elements

A brass having a crystal texture in which the total proportion of α phase and β phase is not less than 85%, and consisting of:

not less than 55% by weight and not more than 75% by weight of copper (Cu),
not less than 0.3% by weight and not more than 4.0% by weight of bismuth (Bi),
not less than 1.5% by weight and not more than 3.0% by weight of tin (Sn), and
y % by weight of boron (B) and x % by weight of silicon (Si), y and x satisfying the following requirements:
(1) 0.025ab<y≦0.3 when 0≦x≦0.1ab,
(2) −0.105x+0.0355ab<y≦0.3 when 0.1ab<x≦0.3ab,
(3) 0.004ab<y≦0.3 when 0.3ab<x≦0.5ab,
(4) 0.007x+0.0005ab<y≦0.3 when 0.5ab<x≦1.0ab, and (5) 0.045x−0.0375(2−ab)<y≦0.3 when 1.0ab<x≦2.0,
wherein a is 0.2 when Bi is 0.3% by weight ≦Bi<0.75% by weight;
0.85 when Bi is 0.75% by weight ≦Bi<1.5% by weight;
and 1 when Bi is 1.5% by weight ≦Bi≦4.0% by weight, and
b is 1 when the apparent content of zinc (Zn) is not less than 37% and less than 41%;
and 0.75 when the apparent content of Zn is not less than 41% and not more than 45%, and
the balance consisting of Zn and unavoidable impurities.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/308,966Filed 1 Oct 2008
Priority: JP 2007-26449010 Oct 2007
Published: 22 Oct 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

C22C 9/04
Alloys based on copper: with zinc as the next major constituent
B22C 9/22
Moulds or cores ; Moulding processes: moulds for peculiarly-shaped castings
C22C
Alloys
B22C
Foundry moulding

Family

US 8,968,492 B2Related patent
US 2009/0263272 A1This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

Citations

Open elsewhere

USPTO full text and PDF
Patent Center file history
USPTO assignment records
Espacenet
Google Patents