CN104328305A - High-strength brass alloy bar - Google Patents
High-strength brass alloy bar Download PDFInfo
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- CN104328305A CN104328305A CN201410642397.4A CN201410642397A CN104328305A CN 104328305 A CN104328305 A CN 104328305A CN 201410642397 A CN201410642397 A CN 201410642397A CN 104328305 A CN104328305 A CN 104328305A
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- 239000000956 alloy Substances 0.000 title claims abstract description 80
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 79
- 229910001369 Brass Inorganic materials 0.000 title claims abstract description 62
- 239000010951 brass Substances 0.000 title claims abstract description 62
- 229910052762 osmium Inorganic materials 0.000 claims abstract description 37
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 claims abstract description 37
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052802 copper Inorganic materials 0.000 claims abstract description 29
- 239000010949 copper Substances 0.000 claims abstract description 29
- 239000012535 impurity Substances 0.000 claims abstract description 22
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000011701 zinc Substances 0.000 claims abstract description 16
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 16
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 15
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims abstract description 15
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 10
- 230000002829 reductive effect Effects 0.000 claims abstract description 5
- 238000007670 refining Methods 0.000 claims description 24
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 17
- 229910052718 tin Inorganic materials 0.000 claims description 17
- 239000013078 crystal Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 239000011572 manganese Substances 0.000 claims description 9
- 229910052748 manganese Inorganic materials 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 8
- 238000010622 cold drawing Methods 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 7
- 238000013019 agitation Methods 0.000 claims description 6
- 238000009749 continuous casting Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- PTVDYARBVCBHSL-UHFFFAOYSA-N copper;hydrate Chemical compound O.[Cu] PTVDYARBVCBHSL-UHFFFAOYSA-N 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 208000037656 Respiratory Sounds Diseases 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 230000004907 flux Effects 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 239000012071 phase Substances 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 6
- 230000003628 erosive effect Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 229910000487 osmium oxide Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- JIWAALDUIFCBLV-UHFFFAOYSA-N oxoosmium Chemical compound [Os]=O JIWAALDUIFCBLV-UHFFFAOYSA-N 0.000 description 2
- 229910000714 At alloy Inorganic materials 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 238000004500 asepsis Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
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- 230000036541 health Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000006386 memory function Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a high-strength brass alloy bar which is prepared from the following components in percentage by weight: 66-69wt% of copper, 1.1-1.92wt% of bismuth, 0.15-0.23wt% of manganese, 0.1-0.17wt% of osmium, 0.1-0.5wt% of thin and the balance of zinc and inevitable impurities, wherein the total weight of the inevitable impurities is not greater than 0.5wt%. The invention further provides a preparation method of the high-strength brass alloy bar. The high-strength brass alloy bar provided by the invention has relatively high strength, toughness and abrasive resistance and can better bear impact and wear, so that breakage and deformation of the brass copper bar are reduced and the using safety of the bar is improved. The brass alloy bar is suitable for occasions below 40 DEG C.
Description
Technical field
The present invention relates to a kind of metal bar, more particularly, it relates to a kind of high-strength brass alloy bar.
Background technology
Copper is the indispensable key project material of development of modern industry, and it is in the ascendant that domestic and international Novel copper alloy develops upsurge, and be born large quantities of high-performance, the copper alloy new variety of high technology content, new technology.Brass is most important alloy kind in copper alloy, is world-famous for low cost excellent property, widespread use all fields of national economy.Along with modern science and technology progress, people are day by day deep to complex brass research, find can significantly improve its performance by adding polynary a small amount of alloying element, material is made to produce many new features with practical application foreground, as shape memory function, snappiness, high strength, high abrasion, anti-corrosion, Wear vesistance etc.
Copper is because of its good electroconductibility, and plasticity-, erosion resistance, application widely.Brass alloys are copper zinc alloy, and wherein main element is metallic copper and metallic zinc, secondly in brass alloys, add Lv ﹑ Nie ﹑ Meng ﹑ Xi ﹑ Gui ﹑ lead and other elements, can improve the performance of brass alloys, for different places.But brass alloys ubiquity problem: undercapacity, surface hardness is lower, and when being subject to impact to a certain extent, surface easily produces swash, and brass alloys surface is easy to wear; Simultaneously Winn bronze in use has scorification and goes out, and when lead enters human body, can cause very large threat to human health.
At present, application number is that the disclosed Chinese patent of CN200910154951 application discloses a kind of low-cost corrosion-resistant lead-free easy-cutting brass and manufacture method thereof, and it substitutes the lead composition in market brass by arsenic.This brass alloys solve the plumbous harm brought, and make brass alloys have good cutting ability, but its hardness and surface abrasion resistance ability all reduce simultaneously.
Application number is that the disclosed Chinese patent of CN201410197542.2 application discloses a kind of high strength tin brass alloy material and preparation method thereof, and the chemical element composition that it contains and mass percent thereof are: manganese 0.7-0.9, zinc 11.5-11.9, iron 0.3-0.5, boron 0.1-0.2, chromium 0.4-0.6, tin 8.2-8.5, aluminium 0.6-0.9, Zr0.06-0.09, Li0.2-0.4, surplus are copper.High strength tin brass alloy casts post-processing temperature by conservative control, use copper scrap as raw material, make core hardness and surface hardness basically identical, alloy quality is homogeneous; Add manganese, iron, aluminium, make the intensity of alloy high, processing characteristics is excellent; By adding the elements such as tin, boron, chromium, adding erosion resistance, also there is good electroconductibility, can be used for producing press worked product, also may be used for producing cast article.The refining agent of high strength tin brass alloy is used for Foundry Production, the degree of porosity in foundry goods can be made to reduce 1-2 degree, oxide inclusion, at about 2 grades, significantly improves yield rate, but its wear-resistant ability is lower, although the oxide film that wherein aluminium and lithium are formed at alloy surface can play oxidation resistant effect by alloy, but the hardness of oxide film is lower, do not possess friction resistant ability, through rubbing for a long time, alloy surface will be caused to scratch, and antiwear property is poor.
Summary of the invention
For the deficiency that prior art exists, the object of the present invention is to provide a kind of high-strength brass alloy bar, at utmost can improve the intensity of bar, hardness and toughness, there is certain that corrosion and wear resistance, environment-protecting asepsis simultaneously.
For achieving the above object, the invention provides following technical scheme: a kind of high-strength brass alloy bar, the composition and ratio of brass alloys is 60-70wt% copper, 0.1-2.3wt% bismuth, 0.05-0.52wt% manganese, 0.09-0.35wt% osmium, 0.1-0.85wt% tin, surplus is zinc and inevitable impurity, and inevitable total impurities is less than 0.5wt%.
As preferably, the composition and ratio of brass alloys of the present invention is 66-68.7wt% copper, 1.1-1.92wt% bismuth, 0.15-0.23wt% manganese, 0.1-0.17wt% osmium, 0.1-0.5wt% tin, surplus is zinc and inevitable impurity, and inevitable total impurities is less than 0.5wt%.
As preferably, the composition and ratio of brass alloys of the present invention is 67.2wt% copper, 1.43wt% bismuth, 0.18wt% manganese, 0.14wt% osmium, 0.37wt% tin, and surplus is zinc and inevitable impurity, and inevitable total impurities is less than 0.5wt%.
By adopting technique scheme, adding manganese, osmium, making the intensity of alloy high, processing characteristics is excellent, wherein osmium element can improve the surface abrasion resistance of alloy bar material, and manganese element can put forward heavy alloyed toughness, makes alloy bar material can bear larger surging force and not rupture; By adding tin element, adding erosion resistance, also there is good electroconductibility, can be used for producing press worked product, also may be used for producing cast article; Add bismuth to expand in process of setting, favourable to feeding, bismuth reduces alloy strength slightly, but significantly improves the cutting ability of brass alloys bar, makes bar be easy to be processed into required shape.
A kind of technique preparing high-strength brass alloy bar according to claim 1:
1. prepare burden: prepare burden by alloy proportion;
2. melting: drop into blister copper in smelting furnace after, reductive agent covers, after dropping into manganese and tin, flux covers; Copper and zinc is again dropped into after fusing; Finally drop into osmium and bismuth;
3. slagging-off and refining: drop into 2/3 refining agent when starting to melt until step copper 2., zinc, stirs aluminium alloy and makes it even, pull slag out after stopping, dropping into residue refining agent carry out the refining of slagging-off flame on copper alloy liquid surface; Again drag for slag;
5. horizontal casting: select mould to carry out horizontal casting, continuous casting water-cooled is also pulled, and obtains hair rod; Polishing minute surface detects without the visible pore of naked eyes, crackle;
6. cold drawing, aligning and scale sawing: hair rod carries out drawing at cold drawing bench, through aligning, obtains finished product brass alloys bar; Bar carries out sawed-off by size on demand.
By adopting technique scheme, preparation technology of the present invention is reasonable in design, and the impurity in the liquid alloy after melting, slagging-off, refining is few; Be pulled by water-cooled in casting process and obtain the higher bar of surface hardness; Rational control is pulled speed and water-cooled temperature, and make Surface of Rod Bar smooth finish higher, flawless and cracking, Surface of Rod Bar quality is high, and wear resistance is high.
The present invention is set to further: step 3. middle qualified samples converter flow to holding furnace copper water convection agitation 20 minutes.
By adopting technique scheme, convection agitation enables osmium element evenly be arranged in liquid copper alloy inside, avoids the phenomenon that osmium element is sunken to bottom, improves the intensity of copper alloy and surface hardness and surface abrasion resistance.
The present invention is set to further: step 3. in the temperature of refining be 980-1020 DEG C, time 15-25 minute.
By adopting technique scheme, refining temperature is controlled at about 1000 DEG C, make the impurity in copper alloy and the oxygen generation oxidizing reaction in air, reduce the content of impurity in alloy, improve the wear resistance of copper alloy, electric conductivity, thermal conductivity, erosion resistance and other mechanical propertys.
The present invention is set to further: step 4. middle continuous casting cooling adopts water-cooled, water temperature 40-45 DEG C, discharge 4-5.3m/min.
By adopting technique scheme, carry out chilling to the copper rod in drawing process, make the grain refining of bar inner alloy, can obtain the bar of higher-strength, surface hardness is higher.
The present invention is set to further: step 4. in be pulled speed 3-3.2m/min, copper rod grain fineness number is 0.015-0.03mm, α and β phasic property crystal grain ratio is 3: 1, and unit elongation is greater than 20%.
By adopting technique scheme, control the speed that is pulled, make bar crystal grain based on α crystal grain, grain fineness number is more tiny, and the internal stress of bar is little, and the hardness of bar and tensile property are all higher.
Accompanying drawing explanation
Fig. 1 is preparation technology's schema of a kind of high-strength brass alloy bar of the present invention embodiment.
Embodiment
With reference to Fig. 1, a kind of high-strength brass alloy bar of the present invention embodiment is described further.
As shown in Figure 1, a kind of high-strength brass alloy bar, it is characterized in that: the composition and ratio of brass alloys is 67.2wt% copper, 1.43wt% bismuth, 0.18wt% manganese, 0.14wt% osmium, 0.37wt% tin, surplus is zinc and inevitable impurity, and inevitable total impurities is less than 0.5wt%.
Wherein, the preparation technology of high-strength brass alloy bar is:
1. prepare burden: prepare burden by alloy proportion;
2. melting: drop into blister copper in smelting furnace after, charcoal (adopting charcoal as reductive agent) covers, after dropping into manganese and tin, flux covers; Copper and zinc is again dropped into control copper zinc ratio in brass after fusing; Finally drop into osmium and bismuth;
3. slagging-off and refining: the amount of required refining agent is the 0.2-0.4% of brass alloys liquid, 2/3 refining agent is dropped into when starting to melt until step copper 2., zinc, stirring aluminium alloy makes it even, pulls slag out after stopping, dropping into residue refining agent carry out the refining of slagging-off flame on copper alloy liquid surface; Refining temperature is 1000 DEG C, 20 minutes time, again drags for slag;
4. inspection and temperature control: after sampling detection chemical composition is qualified, converter flow to holding furnace copper water convection agitation 20 minutes; 5. horizontal casting: select graphite jig to carry out horizontal casting, continuous casting coolant water temperature 42 DEG C, discharge 4.7m/min, be pulled speed 3.1m/min; Copper rod grain fineness number is 0.015-0.03mm, α and β phasic property crystal grain ratio is 3: 1, and polishing minute surface detects without the visible pore of naked eyes, crackle, and tensile strength is 290Mpa, and unit elongation is greater than 20%, obtains hair rod;
6. cold drawing, aligning and scale sawing: hair rod carries out drawing at cold drawing bench, through aligning, obtains finished product brass alloys bar; Bar carries out sawed-off by size on demand.
Preparation technology of the present invention is reasonable in design, and the impurity in the liquid alloy after melting, slagging-off, refining is few; Be pulled by water-cooled in casting process and obtain the higher bar of hardness; Rational control is pulled speed and water-cooled temperature, and make Surface of Rod Bar smooth finish higher, flawless and cracking, Surface of Rod Bar quality is high, and by cold drawing, surface hardness is increased further, wear resistance is high.
By adding tin element, adding erosion resistance, also there is good electroconductibility, can be used for producing press worked product, also may be used for producing cast article; Add bismuth to expand in process of setting, favourable to feeding, bismuth reduces alloy strength slightly, but significantly improves the cutting ability of brass alloys bar, makes bar be easy to be processed into required shape.
Manganese and osmium add in brass alloys jointly, because the covalent radius of osmium simple substance is very little, when osmium is fused in brass alloys liquid, osmium simple substance can be fused in the gap between alloy crystal, secondly the atomic radius of manganese is inferior to the covalent radius of osmium, and when in high temperature environments, osmium and manganese enter in the gap between alloy crystal jointly, formation take osmium as the interstitial solid solution of core, and the covalent radius of osmium and manganese is less than the two atomic radius sum.
The common use of manganese and osmium can make the mechanical property of brass alloys obtain comprehensive lifting, and its toughness, hardness, intensity and wear resistance are all improved, and processing characteristics is excellent.Wherein osmium element can improve hardness and the surface abrasion resistance of alloy bar material inner materials, but easily makes brass alloys bar become not only hard but also crisp, if surging force is excessive, is easy to make bar that fracture or cracked occurs; And manganese element can put forward heavy alloyed toughness, alleviate the hard crisp problem that osmium element brings, make bar can bear a large amount of surging forces, and only stay the next vestige that impacts, avoid the fracture of bar, the mechanical property of bar is largely increased.
Osmium element makes Surface of Rod Bar hardness higher simultaneously, and the osmium oxide film hardness formed is higher, improves the wear resistance of bar.But the fusing point due to osmium oxide only has 41 DEG C, therefore it is applicable to low temperature environment (temperature is lower than 40 DEG C) or vacuum anaerobic environment.
Wherein, step 3. in qualified samples converter flow to holding furnace copper water convection agitation 20 minutes.
Density due to osmium simple substance is the heaviest in all metals, osmium element exists with the form of sosoloid in brass alloys, but also have and a small amount of be present in alloy liquid with simple substance form, therefore leaving standstill easily causes more osmium element to separate out liquid phase with simple substance form, temperature reduction will cause osmium simple substance to be separated out, then the speed of osmium precipitation liquid phase also will increase, the osmium simple substance generation natural subsidence that density is larger, cause the osmium content in finished product brass alloys on the low side, therefore constantly stir at holding furnace domestic demand alloy liquid, prevent the sedimentation of osmium simple substance from separating out, increasing osmium is present in alloy with the form of sosoloid, make alloy inner homogeneous arrangement osmium element, improve the intensity of copper alloy and surface hardness and surface abrasion resistance.
Wherein, step 3. in the temperature of refining be 1000 DEG C, 20 minutes time.
Refining temperature is controlled at 1000 DEG C, make the impurity in copper alloy and the oxygen generation oxidizing reaction in air, enter in slag with the form of metal oxide, with hydrocarbon reductive agent, the oxygen being melted in copper is removed again, make the content of copper higher, reduce the content of impurity in alloy, improve the wear resistance of copper alloy, electric conductivity, thermal conductivity, erosion resistance and other mechanical propertys.
Wherein, step is middle continuous casting cooling employing water-cooled 4., water temperature 42 DEG C, discharge 4.7m/min.
Chilling is carried out to the copper rod in drawing process, the alloy pig crystal grain of red heat is comparatively tiny, and tiny crystal grain can make the mechanical property everyway of metal comparatively good, and chilling can make the grain refining of bar inner alloy, obtain the bar of higher-strength, surface hardness is higher.
Wherein, step 4. in be pulled speed 3.1m/min, copper rod grain fineness number is 0.015-0.03mm, α and β phasic property crystal grain ratio is 3: 1, and unit elongation is greater than 20%.
People's widespread use for a long time be the single-phase or two-phase brass alloys that are base with α phase and alpha+beta, and it is less to the complex brass research application being base with β phase, then less to the complex brass research application being base with α phase, therefore with the new multicomponent complex brass that β phase is base, tool high strength, good wear mechanism, high media-resistant corrosive power, more valuable is its excellent hot workability, in the complicated high-strength wearable part of the various precision of forging and stamping, there is the advantage that other materials is incomparable, by controlling the speed be pulled, control the degree of drawing of crystal grain in the process that is pulled, and then the ratio of control α and β phase, reach certain coordinative role.
Control is pulled speed, and make the grain fineness number of the crystal grain of acquisition more tiny, the internal stress of bar is little, and the hardness of bar and tensile property are all higher.If the speed be pulled is excessive, what then crystal grain was stretched is comparatively elongated, the consequence that elongated crystal grain brings is that crystal grain has directivity, the anti-pressure ability of its axis is much larger than the anti-pressure ability of radial direction, namely the resistance to bend of bar is more weak, and the excessive velocities be pulled, be easy to cause bar to there is internal stress, produce and rise internal fissure, bar is easily broken; Secondly, if the speed be pulled is excessively slow, then the efficiency of producing is lower, affects production rate.Therefore get the speed 3.1m/min that is pulled, the copper rod grain fineness number obtained is 0.015-0.03mm, α and β phasic property crystal grain ratio is 3: 1, and unit elongation is greater than 20%, ensures the quality of brass alloys bar while not tying down production efficiency.
The above makes the preferred embodiment of the present invention, and under not departing from the prerequisite of the principle of the invention for the person of ordinary skill of the art, can also make some modification and improvement, these also should be considered as protection scope of the present invention.
Claims (8)
1. a high-strength brass alloy bar, it is characterized in that: the composition and ratio of brass alloys is 60-70wt% copper, 0.1-2.3wt% bismuth, 0.05-0.52wt% manganese, 0.09-0.35wt% osmium, 0.1-0.85wt% tin, surplus is zinc and inevitable impurity, and inevitable total impurities is less than 0.5wt%.
2. high-strength brass alloy bar according to claim 1, it is characterized in that: the composition and ratio of brass alloys is 66-68.7wt% copper, 1.1-1.92wt% bismuth, 0.15-0.23wt% manganese, 0.1-0.17wt% osmium, 0.1-0.5wt% tin, surplus is zinc and inevitable impurity, and inevitable total impurities is less than 0.5wt%.
3. high-strength brass alloy bar according to claim 2, it is characterized in that: the composition and ratio of brass alloys is 67.2wt% copper, 1.43wt% bismuth, 0.18wt% manganese, 0.14wt% osmium, 0.37wt% tin, surplus is zinc and inevitable impurity, and inevitable total impurities is less than 0.5wt%.
4. prepare a technique for high-strength brass alloy bar according to claim 1, it is characterized in that:
1. prepare burden: prepare burden by alloy proportion;
2. melting: drop into blister copper in smelting furnace after, reductive agent covers, after dropping into manganese and tin, flux covers; Copper and zinc is again dropped into after fusing; Finally drop into osmium and bismuth;
3. slagging-off and refining: drop into 2/3 refining agent when starting to melt until step copper 2., zinc, stirs aluminium alloy and makes it even, pull slag out after stopping, dropping into residue refining agent carry out the refining of slagging-off flame on copper alloy liquid surface; Again drag for slag;
4. inspection and temperature control: sampling detects chemical composition, and after qualified, converter flow to holding furnace aluminium alloy convection agitation;
5. horizontal casting: select mould to carry out horizontal casting, continuous casting water-cooled is also pulled, and obtains hair rod; Polishing minute surface detects without the visible pore of naked eyes, crackle;
6. cold drawing, aligning and scale sawing: hair rod carries out drawing at cold drawing bench, through aligning, obtains finished product brass alloys bar; Bar carries out sawed-off by size on demand.
5. high-strength brass alloy bar according to claim 4, is characterized in that: step 3. middle qualified samples converter flow to holding furnace copper water convection agitation 15-20 minute.
6. high-strength brass alloy bar according to claim 4, is characterized in that: step 3. in the temperature of refining be 980-1020 DEG C, time 15-25 minute.
7. high-strength brass alloy bar according to claim 4, is characterized in that: step 4. middle continuous casting cooling adopts water-cooled, water temperature 40-45 DEG C, discharge 4-5.3m/min.
8. high-strength brass alloy bar according to claim 4, is characterized in that: step 4. in be pulled speed 3-3.2m/min, copper rod grain fineness number is 0.015-0.03mm, α and β phasic property crystal grain ratio is 3: 1, and unit elongation is greater than 20%.
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| CN105551688A (en) * | 2016-02-16 | 2016-05-04 | 中天合金技术有限公司 | Preparation method of high-accuracy anaerobic bright copper bar |
| CN110306180A (en) * | 2019-08-07 | 2019-10-08 | 杨唯加 | For improving the hot rolling technology of tungsten molybdenum bar surface hardness |
| CN112593116A (en) * | 2020-12-07 | 2021-04-02 | 鹰潭盛发铜业有限公司 | Preparation method of high-strength copper-zinc alloy |
| CN113088750A (en) * | 2021-03-19 | 2021-07-09 | 宁波金田铜业(集团)股份有限公司 | Copper-iron alloy wire and preparation method thereof |
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