CN104087782A - Low-lead brass alloy and preparation method thereof - Google Patents
Low-lead brass alloy and preparation method thereof Download PDFInfo
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- CN104087782A CN104087782A CN201310110823.5A CN201310110823A CN104087782A CN 104087782 A CN104087782 A CN 104087782A CN 201310110823 A CN201310110823 A CN 201310110823A CN 104087782 A CN104087782 A CN 104087782A
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Abstract
The invention discloses a low-lead brass alloy. The low-lead brass alloy comprises 61.5-63.5% of copper and 0.02-0.15% of arsenic and also comprises less than or equal to 0.3% of nickel, less than or equal to 0.1% of aluminum, less than or equal to 0.2% of lead, less than or equal to 0.1% of manganese, iron and tin and the balance Fe and unavoidable impurities, wherein the content of the unavoidable impurities is less than or equal to 0.2%. The low-lead brass alloy reduces an alloy manufacturing cost, improves cutting ability and improves dezincification resistance.
Description
Technical field
The present invention relates to a kind of alloy, relate in particular to a kind of low-lead brass alloy, belong to chemical material field.
Background technology
Brass has good mechanical property, good erosion resistance and lower application cost, has wide range of applications.In order to improve cutting ability and the forgeability of brass, thereby people add lead to form leaded brass always in brass for a long time.Common leaded brass, as the copper alloy pipe fitting of current water supply use, with C84400 and C83600 copper alloy, cast or forge and form, yet C84400 copper alloy lead tolerance is 7%, C83600 lead tolerance also reaches 5%, the pipe fitting of these two kinds of leaded brass manufacturings is when waterworks is used, lead in pipe fitting can be dissolved in water, more than reaching 50PPM according to the lead content in science mensuration water.Plumbous as a kind of harmful element, when environment has been caused to very big pollution, HUMAN HEALTH is also had to very large harm: the lead in leaded brass is a Heavy Metallic Elements, to blood of human body and neural system, particularly children's kidney and cranial nerve can cause the damage that cannot estimate.So in recent years, countries in the world all can change again the low-lead brass alloy material of lead element to environment and human injury striving to find a kind of processing characteristics that neither affects.
In the present patent application people's early stage R&D work, once invented a kind of low-lead brass alloy material of excellent performance, many-side has been improved the performance of low-lead brass alloy, but has used the compositions such as Bi, Se, and manufacturing cost is higher, is difficult for use of large-scale production; Owing to having used the materials such as Bi, affected red punching performance and the welding property of product, over-all properties and the general applicability of product are poor simultaneously.
Summary of the invention
Defect for prior art, applicant in early days on the basis of R&D work by a large amount of experimental studies, thereby developed a kind of new low-lead brass alloy material, neither affect the cutting ability of brass alloy material, possess again good anti-Dezincification corrosion performance and anticorrosion stress-resistant performance, can also reduce the Cu alloy material of lead element to the injury of the pollution of environment and human body, substitute present leaded brass; Meanwhile, by replace the content of Bi trace elements with other common trace elements, lower than unleaded Bi brass cost, also there is unleaded Bi brass be beyond one's reach good red punching performance and welding property, there is better over-all properties.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of low-lead brass alloy, comprise copper and arsenic, wherein the content of copper is 61.5-63.5%, the content of arsenic is 0.02-0.15%, in addition also contains following component: content is higher than 0.3% nickel, and content is not higher than 0.1% aluminium, content is not higher than 0.2% lead, content is all higher than 0.1% manganese, iron, tin, and surplus is zinc and inevitable impurity, and described inevitable foreign matter content is not higher than 0.2%.
Preferred among this, the content of described copper is 62.0-63.0%, and the content of arsenic is 0.05-0.10%, and the content of iron is 0.04-0.10%.
In low-lead brass alloy of the present invention, the content of described zinc is 25.50-38.45%, is preferably as 30.00-38.00%.
In the present invention, not above-mentioned used not referring to and be less than or equal to given numerical value higher than the amount that refers to the described composition of control.Although it will be understood by those skilled in the art that the content that can reduce as far as possible described composition, consider that cost needs and technical difficulty; conventionally still can contain a certain amount of described composition; be appreciated that the development along with technology, can more effectively reduce the content of these compositions.
By above-mentioned composition, low-lead brass alloy disclosed by the invention has good cutting ability, Dezincification corrosion resistant performance, anticorrosion stress-resistant performance, red punching performance and welding property, owing to greatly having reduced plumbous content, is conducive to environmental protection and HUMAN HEALTH.Meanwhile, compare traditionally without leaded brass, low-lead brass alloy of the present invention does not need to add Bi, has reduced production cost; By controlling the content of As and Sn element, significantly promoted the anti dezincification character energy of copper material simultaneously.
Accordingly; the invention discloses the preparation method of described low-lead brass alloy; comprise the steps: to adopt Alloying Treatment and protective covering method melting unleaded containing arsenical copper zinc alloy brass; feed intake; making the quick solid solution in brass liquation such as arsenic, nickel is intermediate compound, and is uniformly distributed in intracrystalline and crystal boundary.
Similar with the low-lead brass alloy complete processing of other types, said process normally carries out in intermediate frequency core-type induction furnace.
Accordingly, after above-mentioned finishing dealing with, also comprise subsequent technique treatment step, also comprise intermediate compound is cast as to ingot casting, extruding, the step of intermediate heat treatment, the annealing that eliminates stress.
Those skilled in the art can select suitable temperature condition and time as required, preferably, at 1040 ℃, be continuously cast into ingot casting, at 680 ~ 760 ℃ of temperature, carry out large extrusion ratio extruding, intermediate heat treatment is carried out at 500 ~ 700 ℃ of temperature by cold worked condition, the annealing that can eliminate stress at the temperature lower than 400 ℃.
That is to say, the most preferred preparation method of low-lead brass alloy of the present invention is in intermediate frequency core-type induction furnace, first add copper ingot and insulating covering agent sodium aluminum fluoride, adopt Alloying Treatment and protective covering method melting unleaded containing arsenical copper zinc alloy brass, in copper melts, by certain ingredients proportioning, feed intake, make As, the quick solid solution in brass liquation of other composition such as Ni is intermediate compound, and make it be uniformly distributed in intracrystalline and crystal boundary, and be continuously cast into ingot casting at 1040 ℃, at 680 ~ 760 ℃ of temperature, carry out large extrusion ratio extruding, intermediate heat treatment is carried out at 500 ~ 700 ℃ of temperature by cold worked condition, the annealing that can eliminate stress at the temperature lower than 400 ℃.
Certain component proportions described above, matches with low-lead brass alloy proportion of composing of the present invention.
In above-mentioned preparation method, the size of ingot casting is not restricted, and can select according to actual needs; In preparation process, in order to prevent material oxidation, preferably in the environment of vacuum environment or protection of inert gas, carry out; The time of melting, cast, hot extrusion, cold working etc. is not subject to special restriction, according to the needs of producing, can adjust; Extrusion ratio can be selected as required, preferred adopts higher extrusion ratio, 10-20 for example, and the method for hot extrusion adopts any available method in this area, is not restricted.
Compare with existing brass product, product of the present invention has following technical superiority:
1. do not use lead material, reduced harm and the infringement to health of environment.
2. kept cutting ability, good anti-Dezincification corrosion performance and anticorrosion stress-resistant performance.
3. good fluidity, has good forgeability.
4. do not need to add the elements such as Bi, Se, Sb, reduced production and use cost.
5. complete processing is simple, can use existing leaded brass equipment to carry out manufacture.
6. there is good red punching performance and welding property.
Embodiment
Below in conjunction with specific embodiment, the present invention is further detailed.
Flow process prepared by low-lead brass alloy of the present invention is: the annealing of starting material preparation-Alloying Treatment and covering protection melting-continuous casting-extruding-thermal treatment-stretch-eliminate stress-follow-up deep processing is processed.
Concrete preparation method is as follows:
In intermediate frequency core-type induction furnace, first add copper ingot and insulating covering agent sodium aluminum fluoride, adopt Alloying Treatment and protective covering method melting unleaded containing arsenical copper zinc alloy brass, in copper melts, by certain ingredients proportioning, feed intake, make As, the quick solid solution in brass liquation of other composition such as Ni is intermediate compound, and make it be uniformly distributed in intracrystalline and crystal boundary, and be continuously cast into ingot casting at 1040 ℃, at 680 ~ 760 ℃ of temperature, carry out large extrusion ratio extruding, intermediate heat treatment is carried out at 500 ~ 700 ℃ of temperature by cold worked condition, the annealing eliminating stress at the temperature lower than 400 ℃.
Applicant's technical study proves, thermal treatment can be carried out lower than the Stress relieving annealing of 400 ℃, intermediate heat treatment need be annealed into according to cold working condition suitable at 500 ~ 700 ℃ of temperature, but avoids the annealing of middle temperature brittle zone as far as possible, and its flow process is produced identical with conventional lead brass alloy substantially.
Finally make the copper rod of φ 29 specifications, totally three, form as follows respectively:
1. 36.80% zinc, 62.50% bronze medal, 0.15% lead, 0.10% arsenic, 0.10% tin, 0.05% aluminium, 0.1% iron, 0.03% manganese, 0.21% nickel, all the other are inevitable impurity;
2. 35.40% zinc, 63.50% bronze medal, 0.18% lead, 0.08% arsenic, 0.08% tin, 0.10% aluminium, 0.08% iron, 0.02% manganese, 0.26% nickel, all the other are impurity;
3. 37.50% zinc, 62.00% bronze medal, 0.12% lead, 0.06% arsenic, 0.07% tin, 0.06% aluminium, 0.04% iron, 0.04% manganese, 0.23% nickel, all the other are impurity;
Get above-mentioned three samples and C3600 standard Winn bronze, carried out respectively the mensuration that tensile strength, unit elongation, hardness, machine add cutting ability, anti-Dezincification corrosion performance, anticorrosion stress-resistant performance.
Measuring method:
Hardness detects the method for recording according to GB/T 2304 and measures;
The method that tensile property is recorded according to GB228-87 is measured;
The method that the dezincify degree of depth is recorded according to GB 10119-88 is measured;
Cutting ability adopts following methods to measure: under same mechanical processing conditions, adopt cutting force experiment instrument to record alloy cutting force, and calculate thus the machinability index of alloy phase to C3600 standard Winn bronze (Winn bronze that generally acknowledged cutting ability is best), the cutting resistance * 100% of cutting resistance/test sample that its method of calculation are C3600.
Stress corrosion (cracking) test adopts the test method of ISO6957: after off-test, sample surfaces is carried out to ten times of amplifications, observe its surface crack situation, not crack as qualified.
Hot workability: extrude from sample alloy the 9*20mm that respectively asks for product and carry out sample, do thermo compression test.Sample heats half an hour at 670 degree, and then axially load deflection amount is 70%, and length reduces to 6mm by 20mm, under ten times of amplifications, observes surface crack situation, does not crack as qualified.
Test result is as follows:
Sample number tensile strength (Mpa) unit elongation (%) hardness (HB)
1 367 27 114
2 362 27 112
3 371 28 115
From above-mentioned data, low-lead brass alloy of the present invention meets copper rod mechanical property: tensile strength >=300 N/MM2; Unit elongation >=25%, high rigidity, and low-lead brass alloy consistence of the present invention is good, and mechanical property has the consistence of height, therefore low-lead brass alloy stable mechanical performance of the present invention at different sample rooms.
The machine of three samples adds cutting ability and is respectively 99,98,100, and cutting ability is easily cutting.
The anti-Dezincification corrosion performance of three samples: the maximum dezincify degree of depth of each sample can be controlled at below 200um, meets GB10119-88 requirement.
The anticorrosion stress-resistant performance of three samples: crackle does not all appear in each sample surfaces after measured, can meet ISO 6957:1998 (E) requirement.
The site technique checking demonstration of carrying out at the construction field (site), low-lead brass alloy welding property of the present invention is good, welding position stabilized structure when welding, welding crackle and cold crack occur.
Claims (8)
1. a low-lead brass alloy, it is characterized in that comprising copper and arsenic, wherein the content of copper is 61.5-63.5%, the content of arsenic is 0.02-0.15%, in addition also contains following component: content is higher than 0.3% nickel, and content is not higher than 0.1% aluminium, content is not higher than 0.2% lead, content is all higher than 0.1% manganese, iron, tin, and surplus is zinc and inevitable impurity, and described inevitable foreign matter content is not higher than 0.2%.
2. low-lead brass alloy according to claim 1, the content that it is characterized in that described copper is 62.0-63.0%, and the content of arsenic is 0.05-0.10%, and the content of iron is 0.04-0.10%.
3. low-lead brass alloy according to claim 1, the content that it is characterized in that described zinc is 25.50-38.45%.
4. low-lead brass alloy according to claim 4, the content that it is characterized in that described zinc is 30.00-38.00%.
5. the preparation method of the low-lead brass alloy described in above-mentioned arbitrary claim; it is characterized in that comprising the steps: to adopt Alloying Treatment and the unleaded arsenical copper zinc alloy brass that contains of protective covering method melting; feed intake; making the quick solid solution in brass liquation such as arsenic, nickel is intermediate compound, and is uniformly distributed in intracrystalline and crystal boundary.
6. preparation method according to claim 5, is characterized in that described reaction carries out in intermediate frequency core-type induction furnace.
7. preparation method according to claim 5, characterized by further comprising intermediate compound is cast as to ingot casting, extruding, the step of intermediate heat treatment, the annealing that eliminates stress.
8. preparation method according to claim 7, it is characterized in that being continuously cast into ingot casting at 1040 ℃, at 680 ~ 760 ℃ of temperature, carry out large extrusion ratio extruding, intermediate heat treatment is carried out at 500 ~ 700 ℃ of temperature by cold worked condition, the annealing eliminating stress at the temperature lower than 400 ℃.
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| CN201310110823.5A CN104087782A (en) | 2013-04-01 | 2013-04-01 | Low-lead brass alloy and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104745863A (en) * | 2015-04-08 | 2015-07-01 | 九牧厨卫股份有限公司 | Low-lead dezincification-resistant brass alloy suitable for being cast |
| CN105543548A (en) * | 2015-12-22 | 2016-05-04 | 路达(厦门)工业有限公司 | Low-cost unleaded anti-dezincification brass alloy used for casting |
| EP3050983A1 (en) * | 2015-01-28 | 2016-08-03 | Toto Ltd. | Brass having improved castability and corrosion resistance |
| WO2018147717A1 (en) * | 2017-02-10 | 2018-08-16 | Nacional de Cobre, S.A. de C.V. | Copper alloys with a low lead content |
| CN115125414A (en) * | 2022-07-27 | 2022-09-30 | 宁波金田铜业(集团)股份有限公司 | Brass alloy and preparation method thereof |
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| EP1273671A1 (en) * | 2001-07-05 | 2003-01-08 | Diehl Metall Stiftung & Co. KG | Dezincification resistant copper-zinc alloy and method for producing the same |
| EP1439238A1 (en) * | 2003-01-16 | 2004-07-21 | REHAU AG + Co | Corrosion resistant brass alloy for parts suitable for use in drinking water service |
| CN1570165A (en) * | 2003-02-28 | 2005-01-26 | 威兰德-沃克公开股份有限公司 | Lead-free copper alloy and a method of manufacture |
| US20110129385A1 (en) * | 2009-11-27 | 2011-06-02 | Chan Wen Copper Industry Co., Ltd. | Copper-zinc alloy |
| CN102312123A (en) * | 2011-09-02 | 2012-01-11 | 浙江艾迪西流体控制股份有限公司 | Brass alloy |
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2013
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Patent Citations (5)
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| EP1273671A1 (en) * | 2001-07-05 | 2003-01-08 | Diehl Metall Stiftung & Co. KG | Dezincification resistant copper-zinc alloy and method for producing the same |
| EP1439238A1 (en) * | 2003-01-16 | 2004-07-21 | REHAU AG + Co | Corrosion resistant brass alloy for parts suitable for use in drinking water service |
| CN1570165A (en) * | 2003-02-28 | 2005-01-26 | 威兰德-沃克公开股份有限公司 | Lead-free copper alloy and a method of manufacture |
| US20110129385A1 (en) * | 2009-11-27 | 2011-06-02 | Chan Wen Copper Industry Co., Ltd. | Copper-zinc alloy |
| CN102312123A (en) * | 2011-09-02 | 2012-01-11 | 浙江艾迪西流体控制股份有限公司 | Brass alloy |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3050983A1 (en) * | 2015-01-28 | 2016-08-03 | Toto Ltd. | Brass having improved castability and corrosion resistance |
| CN104745863A (en) * | 2015-04-08 | 2015-07-01 | 九牧厨卫股份有限公司 | Low-lead dezincification-resistant brass alloy suitable for being cast |
| CN105543548A (en) * | 2015-12-22 | 2016-05-04 | 路达(厦门)工业有限公司 | Low-cost unleaded anti-dezincification brass alloy used for casting |
| EP3395970A4 (en) * | 2015-12-22 | 2019-10-30 | Xiamen Lota International Co., Ltd. | Low-cost lead-free dezincification-resistant brass alloy for casting |
| WO2018147717A1 (en) * | 2017-02-10 | 2018-08-16 | Nacional de Cobre, S.A. de C.V. | Copper alloys with a low lead content |
| CN109963954A (en) * | 2017-02-10 | 2019-07-02 | 国立铜业股份公司 | The copper alloy of low lead content |
| CN115125414A (en) * | 2022-07-27 | 2022-09-30 | 宁波金田铜业(集团)股份有限公司 | Brass alloy and preparation method thereof |
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Effective date of registration: 20160203 Address after: 315000 1301-B Development Zone, Ningbo Free Trade Zone, Ningbo, Zhejiang Applicant after: Ningbo IDC International Trading Co., Ltd. Applicant after: Taizhou aidixi Investment Co. Ltd. Address before: 317600 Yuhuan County mechanical and Electrical Industrial Park, Taizhou, Zhejiang Applicant before: Zhejiang IDC Fluid Control Co., Ltd. Applicant before: Ningbo IDC International Trading Co., Ltd. |
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Application publication date: 20141008 |