CN101215653B - Leadless free-cutting magnesium graphite brass - Google Patents
Leadless free-cutting magnesium graphite brass Download PDFInfo
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- CN101215653B CN101215653B CN2008100304092A CN200810030409A CN101215653B CN 101215653 B CN101215653 B CN 101215653B CN 2008100304092 A CN2008100304092 A CN 2008100304092A CN 200810030409 A CN200810030409 A CN 200810030409A CN 101215653 B CN101215653 B CN 101215653B
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Abstract
A lead-free easy-cutting magnesium graphite brass belongs to the technical field of preparing metal materials, wherein the brass comprises alloying elements which are copper, zinc, magnesium and graphite, the mass percentage of various alloying elements are that the copper is 56.0-64.0 percent, the magnesium is 0.1-3.5 percent, the graphite is 0.1-3.5 percent, the total content of the magnesium and the graphite is 1.0-4.0 percent, the other is the zinc, and the impurity amount is not more than 0.05 percent. The invention is based on prior easy-cutting lead brass, aims to the requirements of the materials under the application environment and application conditions, lead elements which pollutes the environment and has great harm for health are used to replace the magnesium and graphite elements, thereby achieving the lead-free state of the easy-cutting lead brass. The brass currently has excellent cutting performance, hot workability and mechanical properties, is applied to the fields such as electronic devices, water-heating bathrooms and structural parts and the like, and replaces the prior easy-cutting lead brass.
Description
Technical field
The present invention is a kind of manufacturing technology of metallic substance, relates to the manufacture method of leadless free-cutting magnesium graphite brass.
Background technology
Copper alloy containing lead has the performance of easy cutting and physics, chemistry, mechanics, is a widely used class copper alloy.Only about 500,000 tons of the annual production of leaded brass of China at present.But this class copper alloy can cause environmental pollution, be detrimental to health in production and use, thereby it uses the restriction that is subjected to strictness day by day.The U.S. is from August 6th, 1998, requires leaching amount plumbous in the drinking water supply system below 1.1 * 10-3%, and is leaded less than 0.03mg/L in Japan's regulation tap water in 2003.The unleaded instruction of European Union comes into force on July 1st, 2006.And China correspondingly also carries out unleaded since on March 1st, 2007.The i.e. not solid solution of lead does not form intermetallic compound with copper in copper yet, and the lead under the effect of impurity in tap water and organic acid etc. in the copper alloy containing lead can slowly be separated out, and existing copper alloy containing lead is difficult to satisfy above-mentioned environmental protection requirement.In order to reduce plumbous deleterious effect, the scientific research personnel with regard to tap water to the mechanism of corrosion of brass and add element the corrosive effects of brass has been carried out systematic research, and taked multiple measure, as add the corrosion resisting property that alloying elements such as tin, nickel improve leaded brass, or with the lead removal of solubility or the leaching of inhibition lead etc.Owing to exist lead all the time in the brass, these methods can't fundamentally be eliminated plumbous deleterious effect.For tackling this challenge, developed country has at first developed bismuth brass, and when adding bismuth, great majority have also added tin and nickel, and minority has also been added expensive selenium.Because the resource of selenium and bismuth is very limited, and price is higher, cause the cost of bismuth brass high.
Obviously, existing free-cutting brass has following shortcoming:
1) not environmental protection of leaded brass.
2) bismuth brass cost is higher.
The present invention optimizes the microtexture of alloy by adjusting alloying constituent, makes alloy have good cutting ability.
Summary of the invention
The objective of the invention is to effectively solve leaded brass problem of environment pollution caused and the too high problem of bismuth brass composition, can provide a kind of leadless free-cutting magnesium graphite brass cheaply for fields such as electron device, hot-water heating bathroom, structural parts.
Content of the present invention: the composition of non-leaded easily-cutting brass, copper (Cu) 56.0%-64.0%, magnesium (Mg) 0.1%-3.5%, graphite (C) 0.1%-3.5%, but the content sum of magnesium and graphite is 1.0%-4.0%, and all the other are that zinc (Zn) and total amount are not more than 0.05% impurity.
Technical process of the present invention is as follows:
The preparation use frequency cored induction furnace of leadless free-cutting magnesium graphite brass of the present invention or medium-frequency induction furnace, resistance furnace, in the copper zinc alloy melt, by composition proportion and order of addition(of ingredients), add Graphite Powder 99, zinc ingot metal and copper-magnesium master alloy, tapping casting is prepared the cylindrical, copper alloy pig.Alloying constituent control: copper (Cu) 56.0%-64.0%, magnesium (Mg) 0.1%-3.5%, graphite (C) 0.1%-3.5%, wherein the content sum of magnesium and graphite is 1.0%-4.0%, all the other are that zinc (Zn) and total amount are not more than 0.05% impurity.
Advantage of the present invention:
1) realized the unleaded of free-cutting brass, not leaded, environmentally friendly in the alloying constituent, to HUMAN HEALTH.
2) cost is lower, and magnesium elements that is added and graphite are cheap material, so can not increase the cost of alloy.
3) production technique is simple, through after the prepurging, can utilize existing leaded brass equipment to produce, and does not need new investment.
Embodiment 1:
The composition of non-leaded easily-cutting brass, copper (Cu) 56.0%, magnesium (Mg) 0.1%, graphite (C) 1.1%, the content sum of magnesium and graphite is 1.2%, all the other are that zinc (Zn) and total amount are not more than 0.05% impurity.Consider that market value, the production technique of each element carry out cost keeping, the alloy price is equivalent to 95% of HPb59-1, and cutting ability is equivalent to 72%.
Embodiment 2:
The composition of non-leaded easily-cutting brass, copper (Cu) 60.0%, magnesium (Mg) 0.7%, graphite (C) 0.8%, the content sum of magnesium and graphite is 1.5%, all the other are that zinc (Zn) and total amount are not more than 0.05% impurity.Consider that market value, the production technique of each element carry out cost keeping, the alloy price is equivalent to 98% of HPb59-1, and cutting ability is equivalent to 74%.
Embodiment 3:
The composition of non-leaded easily-cutting brass, copper (Cu) 60.0%, magnesium (Mg) 0.6%, graphite (C) 2.1%, the content sum of magnesium and graphite is 2.7%, all the other are that zinc (Zn) and total amount are not more than 0.05% impurity.Consider that market value, the production technique of each element carry out cost keeping, the alloy price is equivalent to 94% of HPb59-1, and cutting ability is equivalent to 71%.
Embodiment 4:
The composition of non-leaded easily-cutting brass, copper (Cu) 64.0%, magnesium (Mg) 3.5%, graphite (C) 0.5%, but the content sum of magnesium and graphite is 4.0%, all the other are that zinc (Zn) and total amount are not more than 0.05% impurity.Consider that market value, the production technique of each element carry out cost keeping, the alloy price is equivalent to 105% of HPb59-1, and cutting ability is equivalent to 76%.
Embodiment 5:
The composition of non-leaded easily-cutting brass, copper (Cu) 64.0%, magnesium (Mg) 0.1%, graphite (C) 3.5%, but the content sum of magnesium and graphite is 3.6%, all the other are that zinc (Zn) and total amount are not more than 0.05% impurity.Consider that market value, the production technique of each element carry out cost keeping, the alloy price is equivalent to 93% of HPb59-1, and cutting ability is equivalent to 70%.
Claims (1)
1. leadless free-cutting magnesium graphite brass, it is characterized in that: the mass percent of each alloying element is respectively in the brass: copper 56.0%-64.0%, magnesium 0.1%-3.5%, graphite 0.1%-3.5%, the content sum of magnesium and graphite is 1.0%-4.0%, all the other are zinc, and total impurities is not more than 0.05wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100304092A CN101215653B (en) | 2008-01-02 | 2008-01-02 | Leadless free-cutting magnesium graphite brass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100304092A CN101215653B (en) | 2008-01-02 | 2008-01-02 | Leadless free-cutting magnesium graphite brass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101215653A CN101215653A (en) | 2008-07-09 |
| CN101215653B true CN101215653B (en) | 2010-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100304092A Active CN101215653B (en) | 2008-01-02 | 2008-01-02 | Leadless free-cutting magnesium graphite brass |
Country Status (1)
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| CN (1) | CN101215653B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103484716A (en) * | 2013-09-28 | 2014-01-01 | 中南大学 | Lead-free free-cutting magnesium brass and manufacturing method thereof |
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2008
- 2008-01-02 CN CN2008100304092A patent/CN101215653B/en active Active
Non-Patent Citations (3)
| Title |
|---|
| JP昭59-170233A 1984.09.26 |
| 黄劲松 等.无铅易切削铜合金.中国有色金属学报16 9.2006,16(9),1486-1493. |
| 黄劲松 等.无铅易切削铜合金.中国有色金属学报16 9.2006,16(9),1486-1493. * |
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| Publication number | Publication date |
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| CN101215653A (en) | 2008-07-09 |
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Owner name: XIAMEN LOTA INTERNATIONAL CO., LTD. Free format text: FORMER OWNER: CENTRAL SOUTH UNIVERSITY Effective date: 20110505 |
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Free format text: CORRECT: ADDRESS; FROM: 410083 NO. 1, LUSHAN SOUTH ROAD, CHANGSHA CITY, HU'NAN PROVINCE TO: 361022 NO. 61, XINGNAN ROAD, JIMEI DISTRICT, XIAMEN CITY, FUJIAN PROVINCE |
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Effective date of registration: 20110505 Address after: 361022 Xiamen, Fujian Province, apricot Road, Jimei District No. 61 Patentee after: Xiamen Lota International Co., Ltd. Address before: 410083 Hunan province Changsha Lushan Road No. 1 Patentee before: Central South University |
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Effective date of registration: 20210323 Address after: 361000 no.2168 Tong'an Avenue, Tong'an District, Xiamen City, Fujian Province Patentee after: Xiamen Bailuda High-tech New Material Co.,Ltd. Address before: 361022 No. 61 apricot Road South, Jimei District, Fujian, Xiamen Patentee before: Luda (Xiamen) Industry Co.,Ltd. |