CN101928856A - Lead-free rare-earth bismuth free-cutting brass bar - Google Patents
Lead-free rare-earth bismuth free-cutting brass bar Download PDFInfo
- Publication number
- CN101928856A CN101928856A CN2009101169887A CN200910116988A CN101928856A CN 101928856 A CN101928856 A CN 101928856A CN 2009101169887 A CN2009101169887 A CN 2009101169887A CN 200910116988 A CN200910116988 A CN 200910116988A CN 101928856 A CN101928856 A CN 101928856A
- Authority
- CN
- China
- Prior art keywords
- free
- lead
- casting
- bismuth
- copper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a lead-free rare-earth bismuth free-cutting brass bar, which is characterized by comprising the following alloy chemical components in weight percentage: 55.0-65.0% of Cu, 0.1-2.0% of Bi, 0.01-0.8% of RE (mixed rare earth), not more than 0.3% of Fe, not more than 0.1% of Pb, not more than 0.5% of other impurities and the balance Zn, wherein, other harmful elements meet the ROHS standard. By adopting environment-friendly adding elements in the invention, the comprehensive property of the brass bar is much better than that of lead brass; and all the elements are beneficial to human body and environment, thus being an ideal material to replace the lead brass.
Description
Technical field
The present invention relates to a kind of cutting brass bar, specifically a kind of lead-free rare-earth bismuth cutting brass alloy bar.
Background technology
Cutting brass is at present mainly based on plumbiferous brass, because its special machinery and physicals are widely used in all trades and professions such as hardware, bike, system pen, electronics, battery, household electrical appliance, communication, clock and watch.But lead is to one of relatively large heavy metal of human body harm, and lead enters environment and is difficult for later on removing, and in environment, accumulate, very easily biological and human body are produced certain toxic action, particularly cranial nerve and the renal function to children causes irreversible damage, and serious meeting causes blood lead, brain lead poisoning, backwardness, dementia, adverse consequences such as active.A large amount of at present its lead contents of plumbiferous brass that use are greatly about 1.5%～3.7%, if the brass of the lead content of this scope is used for bathroom pipeline industry, lead in the alloy can be partially dissolved in water, and known to the science detection, the stripping concentration of lead can reach more than the 50ppm when the highest.Therefore, countries in the world all take much count of pollution that lead causes and the harm that causes, study the free-cutting brass of environment-friendly type in succession, replace the use of leaded brass.The U.S., Japan, European Union and various countries proposed respective limits and have forbidden regulation electric equipment products and hot-water heating, the five metals equipment that exports these countries and regions from July 1st, 2006, required the product lead content to reach corresponding regulation or unleaded.Therefore develop a kind of lead-free rare-earth bismuth free-cutting brass bar and have significant reality and economic implications to replace the use of leaded brass in some fields.
Summary of the invention
Purpose of the present invention just provides a kind of lead-free rare-earth bismuth free-cutting brass bar and preparation method thereof.
The technical solution used in the present invention is: lead-free rare-earth bismuth free-cutting brass bar, it is characterized in that its alloy composition weight percent consists of: Cu:55.0～65.0%, Bi:0.1～2.0%, RE (mishmetal): 0.01～0.8%, Fe :≤0.3%, Pb :≤0.1%, other impurity summation≤0.5%, the Zn surplus, other harmful element satisfies the ROHS standard.
Further prioritization scheme is: the alloy composition weight percent consists of Cu:57.0～62.0%, Bi:0.2～1.4%, RE (mishmetal): 0.05～0.3%, Fe :≤0.3%, Pb :≤0.1%, other magazine summation≤0.5%, the Zn surplus, other harmful element satisfies the ROHS standard.
The preparation method of above-mentioned lead-free rare-earth bismuth free-cutting brass bar, it may further comprise the steps:
(1) prepares burden according to percentage composition; Copper, bismuth are pressed lower limit control under the prerequisite that composition guarantees; Bismuth is considered scaling loss by 3～8%; Rare earth is considered scaling loss by 6～10%; Arsenic is considered scaling loss by 15～20%;
(2) melting in copper and the zinc adding smelting furnace; Furnace charge fusing back insulation is 5～10 minutes in the smelting furnace, and manual setting power 70% stirred melt 3～5 minutes, guaranteed that chemical ingredients is even;
(3) composition adjustment; Guarantee that the melt chemical ingredients is within the scope of regulation; As stokehold chemical composition analysis result when being defective, melt in the stove is compensated or waters down by calculating;
(4) skim; The converter of skimming immediately after the assay was approved of stokehold chemical ingredients; Slag-removing time was controlled within 5 minutes;
(5) continuous casting; When smelting furnace copper glassware for drinking water is come out of the stove condition fully, can be by chute with copper water metaideophone to holding furnace, the casting temp of control holding furnace is at 935 ℃～945 ℃; In holding furnace, add nitrogen,, carry out casting manipulations again, get ingot casting when casting cavity nitrogen copper water liquid level reaches the casting liquid level;
(6) to the ingot casting heating, push again;
(7) pickling;
(8) draw dial brass rod.
The invention has the beneficial effects as follows: rare-earth bismuth free-cutting brass bar, be characterized in having used environment-friendly type to add element, make its over-all properties surpass leaded brass, used element is useful to human body, environment, is the ideal material that substitutes yellow lead bronze.Can extensively be used in fields such as hot-water heating, electrical equipment, machinery, five metals ornaments, valves, bearing.Adopt melting, continuous casting, extruding and stretching technique to be processed into the various bars of required specification.
Embodiment
A kind of lead-free rare-earth bismuth free-cutting brass bar of the present invention, the alloy composition weight percent consists of Cu:57.0～62.0%, Bi:0.2～1.4%, RE (mishmetal): 0.05～0.3%, Fe :≤0.3%, Pb :≤0.1%, other magazine summation≤0.5%, the Zn surplus, other harmful element satisfies the ROHS standard.
The preparation method is: batching-melting-insulation-sampling composition analysis-casting-sampling composition analysis-turning-railway carriage-heating-extruding-sampling turning-stretching-sampling-annealing-pickling-sampling mechanical property is picked up measuring car and is cut.Flow process is produced identical with the lead brass alloy of routine substantially.
The preparation method is as follows in detail:
1 batching
1.1 ingredients principle
A) prepare burden according to each constituent element composition prescribed value in the component list;
B) copper, bismuth are pressed lower limit control under the prerequisite that composition guarantees;
C) use same batch master alloy during every heat adapted master alloy as far as possible, each constituent element composition is by mean value calculation in the master alloy;
D) bismuth is considered scaling loss by 3～8% in the master alloy; Rare earth is considered scaling loss by 6～10%; Arsenic is considered scaling loss by 15～20%.
2 reinforced and fusings
Reinforced employing as far as possible adds trolley and finishes, cannot finish available driving or hand-fed under the situation of reinforced task adding trolley, but must carefully add, avoid manually throwing away at a distance material or bulk material and throw stove fast, prevent to damage the burner hearth refractory materials or jeopardize personnel safety.There is the following reinforced limit of situation of certain melting initiator to send electrofusion at burner hearth; If coreless furnace send electrofusion after must dropping into certain metal when not having melting initiator or melting initiator deficiency.
3 reinforced stirrings and sampling
3.1 furnace charge fusing back insulation is 5～10 minutes in the smelting furnace, manual setting power 70% stirred melt 3～5 minutes.After guaranteeing that chemical ingredients evenly, can take a sample and carry out the stokehold chemical composition analysis.
3.2 the steel spoon is used in sampling, locates to dip about 500mm under the copper water liquid level in stove, in time is sent to the laboratory and carries out analysis of components.
4 composition adjustment
Before the converter of copper water, must guarantee that the melt chemical ingredients is within the scope of regulation in the smelting furnace.As stokehold chemical composition analysis result when being defective, must compensate or water down melt in the stove by calculating.
5 skim
The converter of skimming immediately after the assay was approved of stokehold chemical ingredients.Slag-removing time was controlled within 5 minutes.Skimming must be clean, thoroughly, can not stay any dead angle, influence ingot quality in order to avoid bring holding furnace into during converter.
6 continuous castings
6.1 when smelting furnace copper glassware for drinking water is come out of the stove condition fully, can be by chute with copper water metaideophone to holding furnace, the casting temp of control holding furnace is at 935 ℃～945 ℃.
6.2 casting manipulations preparation work mainly contains the pressure controlled valve pipeline of preparing dummy bar, cleaning holding furnace top.
6.3 after preparation work is finished, can inject copper water to holding furnace, when can be used for casting effective copper water weight, start holding furnace nitrogen Controlling System at 2～3 ton hours, and manual pressure, when casting cavity nitrogen copper water liquid level reaches the casting liquid level, carry out casting manipulations again.
6.4 to the ingot casting sawing.
The heating of 7 ingot castings
7.1 configure Heating temperature, to the bad heating of ingot.
7.2 induction heating after satisfy processing requirement, discharging.
8 extruding
8.1 container preheating: container is preheated to 475 ℃.
8.3 mould and die preheating: the mould that assembles is put into the die preheating furnace preheating, be preheated to 450 ℃ and be incubated more than 60 minutes.Carry out squeeze job.
9 pickling; Put into cold water in the acid tank earlier, in water, put acid slowly then, the ingot after the extruding is badly carried out pickling.
10 drawings promptly get brass rod.
Claims (3)
1. lead-free rare-earth bismuth free-cutting brass bar, it is characterized in that its alloy composition weight percent consists of: Cu:55.0～65.0%, Bi:0.1～2.0%, RE (mishmetal): 0.01～0.8%, Fe :≤0.3%, Pb :≤0.1%, other impurity summation≤0.5%, the Zn surplus, other harmful element satisfies the ROHS standard.
2. brass rod according to claim 1, it is characterized in that the alloy composition weight percent consists of Cu:57.0～62.0%, Bi:0.2～1.4%, RE (mishmetal): 0.05～0.3%, Fe :≤0.3%, Pb :≤0.1%, other impurity summation≤0.5%, the Zn surplus, other harmful element satisfies the ROHS standard.
3. preparation method of lead-free rare-earth bismuth free-cutting brass bar according to claim 1 is characterized in that it may further comprise the steps:
(1) prepares burden according to percentage composition; Copper, bismuth are pressed lower limit control under the prerequisite that composition guarantees; Bismuth is considered scaling loss by 3～8%; Rare earth is considered scaling loss by 6～10%; Arsenic is considered scaling loss by 15～20%;
(2) melting in copper and the zinc adding smelting furnace; Furnace charge fusing back insulation is 5～10 minutes in the smelting furnace, and manual setting power 70% stirred melt 3～5 minutes, guaranteed that chemical ingredients is even;
(3) composition adjustment; Guarantee that the melt chemical ingredients is within the scope of regulation; As stokehold chemical composition analysis result when being defective, melt in the stove is compensated or waters down by calculating;
(4) skim; The converter of skimming immediately after the assay was approved of stokehold chemical ingredients; Slag-removing time was controlled within 5 minutes;
(5) casting; When smelting furnace copper glassware for drinking water is come out of the stove condition fully, can be by chute with copper water metaideophone to holding furnace, the casting temp of control holding furnace is at 935 ℃～945 ℃; In holding furnace, add nitrogen,, carry out casting manipulations again, get ingot casting when casting cavity nitrogen copper water liquid level reaches the casting liquid level;
(6) to the ingot casting heating, push again;
(7) pickling;
(8) draw dial brass rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101169887A CN101928856A (en) | 2009-06-18 | 2009-06-18 | Lead-free rare-earth bismuth free-cutting brass bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101169887A CN101928856A (en) | 2009-06-18 | 2009-06-18 | Lead-free rare-earth bismuth free-cutting brass bar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101928856A true CN101928856A (en) | 2010-12-29 |
Family
ID=43368281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101169887A Pending CN101928856A (en) | 2009-06-18 | 2009-06-18 | Lead-free rare-earth bismuth free-cutting brass bar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101928856A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103484710A (en) * | 2012-09-05 | 2014-01-01 | 阮伟光 | Bismuth brass alloy drawn bar containing trace rare earth and manufacture method thereof |
| CN104109774A (en) * | 2013-04-18 | 2014-10-22 | 鹤山市金洲铜材实业有限公司 | Environment-protective lead-free brass and preparation method thereof |
| CN105420540A (en) * | 2015-11-02 | 2016-03-23 | 苏州金仓合金新材料有限公司 | Environment-friendly lead-free alloy new material alloy pipe applicable to high-speed locomotive |
-
2009
- 2009-06-18 CN CN2009101169887A patent/CN101928856A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103484710A (en) * | 2012-09-05 | 2014-01-01 | 阮伟光 | Bismuth brass alloy drawn bar containing trace rare earth and manufacture method thereof |
| CN104109774A (en) * | 2013-04-18 | 2014-10-22 | 鹤山市金洲铜材实业有限公司 | Environment-protective lead-free brass and preparation method thereof |
| CN105420540A (en) * | 2015-11-02 | 2016-03-23 | 苏州金仓合金新材料有限公司 | Environment-friendly lead-free alloy new material alloy pipe applicable to high-speed locomotive |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109468501B (en) | Preparation method of high-strength corrosion-resistant aluminum alloy | |
| CN103509967B (en) | A kind of gravitational casting special DZR environment-friendly yellow brass alloy ingot and manufacture craft thereof | |
| CN103540777B (en) | A kind of method automatically producing magnesium-rare earth intermediate alloy continuously | |
| CN102816959A (en) | Large-specification aluminum alloy round bar and casting method thereof | |
| CN105886855A (en) | Aluminum alloy thick plate and production method thereof | |
| CN101701304A (en) | Low-cost corrosion-resistant lead-free easy-cutting brass and manufacturing method thereof | |
| CN103911525B (en) | A kind of materials recycling LEAD-FREE BRASS ALLOY and preparation method thereof | |
| CN103484712B (en) | Containing bismuth-brass alloy drawn tube and the manufacture method thereof of trace rare-earth | |
| CN101928856A (en) | Lead-free rare-earth bismuth free-cutting brass bar | |
| CN101696479B (en) | Method for producing lead-calcium alloy | |
| CN102304632A (en) | Method for preparing lead bismuth alloy for nuclear reactor | |
| CN102345025B (en) | Preparation method of DR (dezincification resistant) copper ingot | |
| CN104651660A (en) | Easily processed silicon brass alloy and preparation method thereof | |
| CN103509968B (en) | The manufacture craft of the special low plumbous environment-friendly yellow brass alloy ingot of a kind of gravitational casting | |
| CN107164687A (en) | A kind of preparation method of relief valve body | |
| CN104109774A (en) | Environment-protective lead-free brass and preparation method thereof | |
| CN106756221B (en) | A kind of free machining bismuth silicon one-ton brass remelting polishing copper ingot and its manufacturing method | |
| CN104384750A (en) | Lead-free copper-based amorphous brazing material | |
| CN107858555A (en) | A kind of ocean engineering high-strength high Vulcan metal and preparation method thereof | |
| CN103773993B (en) | A kind of zinc electroplating bath cupronickel alloy material and preparation method thereof | |
| CN103966469B (en) | A kind of continuous casting and rolling production technology of aluminium alloy solder flux band blank | |
| CN102828065A (en) | Copper-manganese alloy | |
| CN112626387A (en) | Food-grade environment-friendly aluminum ingot and preparation method thereof | |
| CN201979052U (en) | Equipment for horizontally and continuously casting phosphor copper anodes | |
| CN103509969B (en) | The manufacture craft of a kind of gravitational casting special A level brass alloys ingot |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20101229 |