CN101550503A - Free-cutting Mg-Ca brass and preparation method thereof - Google Patents
Free-cutting Mg-Ca brass and preparation method thereof Download PDFInfo
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- CN101550503A CN101550503A CNA2009100434211A CN200910043421A CN101550503A CN 101550503 A CN101550503 A CN 101550503A CN A2009100434211 A CNA2009100434211 A CN A2009100434211A CN 200910043421 A CN200910043421 A CN 200910043421A CN 101550503 A CN101550503 A CN 101550503A
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Abstract
The invention discloses a free-cutting Mg-Ca brass and a preparation method thereof, the Mg-Ca brass consists of copper, zinc, magnesium, calcium alloy elements and unavoidable impurities. The alloy comprises: 58-62 wt% of the copper, 0.5-3.0wt% of the magnesium, 0.1-1.5 wt% of the calcium and the balances as the zinc and the unavoidable impurities, the total content of the impurities is less than 0.1 wt%. The invention also discloses a preparation method for lead-free Mg-Ca brass. On the basis of present normal lead brass, the invention uses the magnesium and calcium elements to replace the lead element that jeopardizes environment and human body severely in consideration of main using performance and demand of the material, and meanwhile, in accordance with the requirements of environmental protection of countries all around the world, especially the developed countries, thus meeting the environmentally-friendly demand. The alloy also has excellent casting property, processing property, dynamic property, corrosion resistance and cutting property, and can take the place of the present lead Mg-Ca brass, moreover, the invention is low in manufacturing cost and can be applied to water-heating and bathroom apparatuses as well as to other various production fields.
Description
Technical field
The present invention relates to a kind of brass and preparation method thereof, refer more particularly to a kind of environmental protection leadless easy-cutting magnesium calcium brass alloy and preparation method thereof with excellent cutting ability, mechanical property and corrosion resistance nature.
Background technology
Leaded brass has performances such as good easy cutting, mechanics, physics, it is an Albatra metal-of widespread use, developed country only the rate of utilization of brass water pipe just up to more than 90%, yet lead is a kind of to environment and the huge element of human body damaging effect, lead exists in free state simple substance mode in leaded brass, and enter in the water therefore lead content that must the various products of strict control in industrial production along with the corrosion of leaded brass.At present the substitution studies of no leaded brass mainly contains bismuth brass and merimee's yellow copper, but domestic research to bismuth, merimee's yellow copper does not form independent intellectual property right as yet.
Summary of the invention
First technical problem to be solved by this invention provides a kind of have excellent cutting ability, corrosion resistance nature, hot workability and mechanical property and the free-cutting Mg-Ca brass of environmentally safe.
Second technical problem to be solved by this invention provides the preparation method that this free-cutting Mg-Ca brass reaches.
In order to solve above-mentioned first technical problem, free-cutting Mg-Ca brass provided by the invention, become to be grouped into by copper, zinc, magnesium, calcium alloy element and unavoidable impurities, consisting of of described alloy: copper: 58～62wt%, magnesium: 0.5～3.0wt%, calcium: 0.1～1.5wt%, all the other are zinc and unavoidable impurities, and the impurity component total content is less than 0.1wt%.
Calcium contents is 0.2～1.4wt%.
Mg content is 0.6～2.8wt%.
The phase composite of described free-cutting Mg-Ca brass is: α phase, β phase and a small amount of tiny intermetallic compound Cu that is uniformly distributed in crystal boundary
2Mg and Cu
5Hard crisp phase such as Ca.
In order to solve above-mentioned second technical problem; the preparation method of free-cutting Mg-Ca brass provided by the invention; adopt protective covering method melting magnesium calcium brass; calcium adds in the furnace with the calcium-base alloy form that fusing point is lower than pure calcium; under 995～1050 ℃, be cast as the brass ingot casting; the homogenizing place is 2～3 hours under 600～750 ℃ of states, pushes under 600～750 ℃ of temperature, carries out stress relieving under 300～400 ℃.
Adopt above-mentioned technology free-cutting Mg-Ca brass and preparation method thereof, the leadless easy-cutting magnesium calcium brass alloy is to utilize magnesium to replace lead, magnesium has certain solid solubility in brass, simultaneously also be the principal element of strengthening and improve the alloy cutting ability, magnesium is preferential and copper reaction generation intermetallic compound Cu in brass
2Mg, this intermetallic compound easily assemble in mutually at alloy crystal boundary and β, form free machining short chip breaking point, thereby improve the cutting ability of alloy.Handle through homogenizing, make to contain magnesium and the disperse distribution in alloy of the formed intermetallic compound of copper, further improve the alloy cutting ability, thereby make unleaded magnesium calcium brass obtain cutting ability excellent as leaded brass and good hot workability.When Mg content more after a little while, the Cu that solid solution generates in alloy or with copper reaction
2The Mg intermetallic compound is less, can not play the effect that improves cutting ability, and Mg content can make when too many alloy plasticity descend, and therefore, the preferred content of magnesium is 0.6wt%～2.8wt% in the alloy.The solid solubility of calcium in brass is very little, and it has been to replenish the element of strengthening and improving the alloy cutting ability, and calcium is preferential and copper reaction generation intermetallic compound Cu in brass
5Ca, this intermetallic compound also can form free machining short chip breaking point in alloy, thereby the cutting ability of alloy is improved.Handle through homogenizing, the disperse in alloy of the formed intermetallic compound of calcic and copper is distributed, the alloy cutting ability is further enhanced.When calcium contents more after a little while, the Cu that solid solution generates in alloy or with copper reaction
5The Ca intermetallic compound is less, can not play and replenish the effect improve cutting ability, and calcium contents can make alloy plasticity descend when too many equally, and therefore, the preferred content of calcium is 0.2wt%～1.4wt% in the alloy.
The present invention is on the basis of existing common lead brass alloys; main use properties and requirement at leaded brass; and the requirement of combining environmental protection; in line with the principle that reduces cost; employing magnesium, calcium constituent replace environmental pollution and human body are endangered more serious lead element, thereby reach unleaded and cheap purpose.Compare with present no leaded brass with leaded brass, have following outstanding advantage and positively effect:
1. be a kind of unleaded brass material, can eliminate plumbous produce and use in harm that environment and human body are caused.
2. have good cutting performance, cold and hot formability, good mechanical property, have excellent corrosion resistance nature simultaneously again, can replace existing lead brass alloy, be applied to hot-water heating sanitary equipment and other various production fields.
3. the aboundresources of China's magnesium and calcium is cheap, can reduce cost significantly.
4. production technique is simple, and is controlled.
Alloy of the present invention is specially adapted to hot-water heating sanitary equipment and other various production fields.It is the new metallic material that helps HUMAN HEALTH and environment protection, also is the meeting of present widespread use causes the leaded brass of baneful influence to human body and environment another new type ideal substitute.
Embodiment
Embodiment casts ingot casting, is squeezed into pole the alloying constituent in the environmental protection leadless easy-cutting magnesium calcium brass according to the form below 1 of the present invention.
Its technological process of production method is as follows:
Starting material are prepared and batching-melting-casting-homogenizing cast ingot-hot extrusion-stress relieving-finished product.
Specifically can be described below: medium-frequency induction furnace is adopted in melting, adds copper ingot and insulating covering agent earlier, in copper melts, by the composition proportion batching, adds zinc, calcium, copper magnesium master alloy in order.Making the rapid solid solution in the brass liquation of magnesium and calcium is intermetallic compound, and uniform distribution, and in swage, be cast as the magnesium BRASS FORGE at 995～1050 times, homogenizing was handled 2～3 hours under 600～750 states, push 600～750, and carry out stress relieving at 300～400 times.
The one-tenth of free-cutting Mg-Ca brass of the present invention is grouped into as shown in table 1:
The one-tenth of table 1 environmental protection leadless easy-cutting magnesium of the present invention calcium brass is grouped into example: (wt%)
Mechanical property such as following table 2 after the non-leaded easily-cutting brass magnesium calcium alloy extruding annealing of the present invention:
The mechanical property of table 2 environmental protection leadless easy-cutting magnesium of the present invention calcium brass
Other performance index are as follows:
Hot workability: suitable with C3604
Cutting ability: embodiment 1: the cutting index is greater than 77%;
Embodiment 2: the cutting index is greater than 76%;
Embodiment 3: the cutting index is greater than 80%;
Embodiment 4: the cutting index is greater than 81%;
Embodiment 5: the cutting index is greater than 84%;
Embodiment 6: the cutting index is greater than 88%;
Embodiment 7: the cutting index is greater than 80%;
Embodiment 8: the cutting index is greater than 85%;
Embodiment 9: the cutting index is greater than 83%.
Embodiment 10: the cutting index is greater than 78%;
Embodiment 11: the cutting index is greater than 77%.
Corrosion resistance nature: unleaded magnesium brass alloy embodiment pushes the annealing back and carries out the dezincify experiment according to GB10119-88 dezincify experimental technique, and measured dezincify layer thickness is as follows:
The average dezincify layer thickness that embodiment 1 records is 416 μ m;
The average dezincify layer thickness that embodiment 2 records is 413 μ m;
The average dezincify layer thickness that embodiment 3 records is 391 μ m;
The average dezincify layer thickness that embodiment 4 records is 425 μ m;
The average dezincify layer thickness that embodiment 5 records is 397 μ m;
The average dezincify layer thickness that embodiment 6 records is 486 μ m;
The average dezincify layer thickness that embodiment 7 records is 476 μ m;
The average dezincify layer thickness that embodiment 8 records is 409 μ m;
The average dezincify layer thickness that embodiment 9 records is 436 μ m.
The average dezincify layer thickness that embodiment 10 records is 404 μ m;
The average dezincify layer thickness that embodiment 11 records is 417 μ m.
The stress test of stress test: embodiment 1 to embodiment 11 annealing back sample all is up to state standards.
Claims (5)
1. free-cutting Mg-Ca brass, it is characterized in that: become to be grouped into by copper, zinc, magnesium, calcium alloy element and unavoidable impurities, consisting of of described alloy: copper: 58～62wt%, magnesium: 0.5～3.0wt%, calcium: 0.1～1.5wt%, all the other are zinc and unavoidable impurities, and the impurity component total content is less than 0.1w t%.
2, free-cutting Mg-Ca brass according to claim 1 is characterized in that: calcium contents is 0.2～1.4wt%.
3, free-cutting Mg-Ca brass according to claim 1 and 2 is characterized in that: Mg content is 0.6～2.8wt%.
4, free-cutting Mg-Ca brass according to claim 1 and 2 is characterized in that: its phase composite is: α phase, β phase and a small amount of tiny intermetallic compound Cu that is uniformly distributed in crystal boundary
2Mg and Cu
5Hard crisp phase such as Ca.
5, the method for preparing the described free-cutting Mg-Ca brass of claim 1; it is characterized in that: adopt protective covering method melting magnesium calcium brass; calcium adds in the furnace with the calcium-base alloy form that fusing point is lower than pure calcium; under 995～1050 ℃, be cast as the brass ingot casting; homogenizing was handled 2～3 hours under 600～750 ℃ of states; under 600～750 ℃ of temperature, push, under 300～400 ℃, carry out stress relieving.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100434211A CN101550503A (en) | 2009-05-15 | 2009-05-15 | Free-cutting Mg-Ca brass and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009100434211A CN101550503A (en) | 2009-05-15 | 2009-05-15 | Free-cutting Mg-Ca brass and preparation method thereof |
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| CN101550503A true CN101550503A (en) | 2009-10-07 |
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| CNA2009100434211A Pending CN101550503A (en) | 2009-05-15 | 2009-05-15 | Free-cutting Mg-Ca brass and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103074516A (en) * | 2013-01-28 | 2013-05-01 | 江西理工大学 | Low-nickel leadless free-cutting cupronickel and preparation method thereof |
| EP4321642A1 (en) * | 2022-08-10 | 2024-02-14 | Diehl Brass Solutions Stiftung & Co. KG | Lead-free brass alloy |
-
2009
- 2009-05-15 CN CNA2009100434211A patent/CN101550503A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103074516A (en) * | 2013-01-28 | 2013-05-01 | 江西理工大学 | Low-nickel leadless free-cutting cupronickel and preparation method thereof |
| EP4321642A1 (en) * | 2022-08-10 | 2024-02-14 | Diehl Brass Solutions Stiftung & Co. KG | Lead-free brass alloy |
| DE102022120122A1 (en) | 2022-08-10 | 2024-02-15 | Diehl Brass Solutions Stiftung & Co. Kg | Lead-free brass alloy |
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Open date: 20091007 |