Carbon steel qhov chaw

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Lub sij hawm carbon steel kuj tseem siv tau rau cov hlau uas tsis yog stainless hlau;nyob rau hauv no siv carbon steel tej zaum yuav muaj xws li hlau alloys.High carbon steel muaj ntau yam kev siv xws li tshuab milling, txiav cov cuab yeej (xws li chisels) thiab siab zog hlau.


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Intruction ntawm Carbon steel qhov chaw

Cov pa roj carbon steel yog cov hlau uas muaj cov ntsiab lus ntawm 0.05 txog 3.8 feem pua ​​​​ntawm qhov hnyav.Lub ntsiab lus ntawm carbon steel los ntawm American Iron thiab Steel Institute (AISI) hais tias:
1. tsis muaj cov ntsiab lus yam tsawg kawg nkaus los yog yuav tsum tau rau chromium, cobalt, molybdenum, npib tsib xee, niobium, titanium, tungsten, vanadium, zirconium, los yog lwm yam khoom yuav tsum tau ntxiv kom tau ib tug xav alloying nyhuv;
2. qhov tsawg kawg nkaus rau tooj liab tsis tshaj 0.40 ib xees;
3. lossis cov ntsiab lus siab tshaj plaws uas tau teev tseg rau ib qho ntawm cov ntsiab lus hauv qab no tsis pub tshaj qhov feem pua ​​​​tau sau tseg: manganese 1.65 ib xees;silicon 0.60%;tooj liab 0.60 feem pua.
Lub sij hawm carbon steel kuj tseem siv tau rau cov hlau uas tsis yog stainless hlau;nyob rau hauv no siv carbon steel tej zaum yuav muaj xws li hlau alloys.High carbon steel muaj ntau yam kev siv xws li tshuab milling, txiav cov cuab yeej (xws li chisels) thiab siab zog hlau.Cov ntawv thov no xav tau ntau qhov microstructure zoo dua, uas txhim kho qhov toughness.

Kev kho cua sov ntawm Carbon steel qhov chaw

Raws li cov pa roj carbon feem pua ​​cov ntsiab lus nce, steel muaj peev xwm ua kom tawv thiab muaj zog los ntawm kev kho cua sov;Txawm li cas los xij, nws ua tsawg dua.Tsis hais txog kev kho cua sov, cov ntsiab lus carbon ntau dua txo qhov weldability.Hauv cov pa roj carbon steel, cov pa roj carbon ntau dua ua rau qis qhov melting point.

Lub hom phiaj ntawm kev kho cua sov kho cov pa roj carbon steel yog hloov cov khoom siv ntawm cov hlau, feem ntau yog ductility, hardness, yield zog, los yog cuam tshuam.Nco ntsoov tias cov hluav taws xob thiab thermal conductivity tsuas yog hloov me ntsis.Raws li nrog rau feem ntau cov txheej txheem ntxiv dag zog rau cov hlau, Young's modulus (elasticity) tsis cuam tshuam.Tag nrho cov kev kho mob ntawm steel kev lag luam ductility kom muaj zog thiab vice versa.Hlau muaj ntau dua solubility rau carbon nyob rau hauv lub austenite theem;Yog li ntawd, tag nrho cov kev kho cua sov, tshwj tsis yog spheroidizing thiab txheej txheem annealing, pib los ntawm cua sov cov hlau mus rau qhov kub ntawm qhov austenitic theem tuaj yeem tshwm sim.Cov hlau yog tom qab ntawd quenched (kub tawm) ntawm tus nqi nruab nrab mus rau qis uas tso cov pa roj carbon diffuse tawm ntawm austenite ua hlau-carbide (cementite) thiab tawm hauv ferrite, lossis ntawm tus nqi siab, ntxiab cov pa roj carbon hauv cov hlau yog li tsim martensite. .Tus nqi ntawm cov hlau txias los ntawm qhov kub ntawm eutectoid (txog 727 ° C) cuam tshuam tus nqi ntawm cov pa roj carbon diffuses tawm ntawm austenite thiab tsim cementite.Feem ntau hais lus, cua txias nrawm yuav tawm cov hlau carbide zoo sib cais thiab tsim cov hmoov nplej pearlite thiab txias maj mam yuav muab cov pearlite coarser.Txias ib qho hypoeutectoid steel (tsawg dua 0.77 wt% C) ua rau cov qauv lamellar-pearlitic ntawm cov hlau carbide txheej nrog α-ferrite (ze li cov hlau ntshiab) ntawm.Yog hais tias nws yog hypereutectoid steel (ntau tshaj 0.77 wt% C) ces cov qauv yog tag nrho pearlite nrog cov nplej me me (loj dua pearlite lamella) ntawm cementite tsim nyob rau hauv cov ciam teb.Ib qho eutectoid steel (0.77% carbon) yuav muaj cov qauv pearlite thoob plaws hauv cov nplej uas tsis muaj cementite ntawm thaj tsam.Cov txheeb ze ntawm cov khoom pov thawj pom tau siv txoj cai lever.Hauv qab no yog cov npe ntawm hom kev kho cua sov ua tau.

Carbon steel qhov chaw Versus Alloy steel qhov chaw

Alloy steel yog hlau uas yog alloyed nrog ntau yam ntsiab lus nyob rau hauv tag nrho cov nyiaj ntawm 1.0% thiab 50% los ntawm qhov hnyav los txhim kho nws cov khoom siv kho tshuab.Alloy steels tau tawg ua ob pawg: cov hlau tsis tshua muaj hlau thiab cov hlau alloy siab.Qhov sib txawv ntawm ob yog sib cav.Smith thiab Hashemi txhais qhov txawv ntawm 4.0%, thaum Degarmo, thiab al., txhais nws ntawm 8.0%.Feem ntau, lo lus "alloy steel" yog hais txog cov hlau tsis tshua muaj hlau.

Hais lus nruj me ntsis, txhua lub hlau yog ib qho hlau, tab sis tsis yog tag nrho cov hlau hu ua "alloy steels".Cov hlau yooj yim tshaj plaws yog hlau (Fe) alloyed nrog carbon (C) (li 0.1% mus rau 1%, nyob ntawm hom).Txawm li cas los xij, lo lus "alloy steel" yog lub ntsiab lus hais txog cov hlau nrog rau lwm cov hlau alloying ntxiv txhob txwm tshaj tawm ntxiv rau cov pa roj carbon.Cov alloyants feem ntau muaj xws li manganese (feem ntau yog ib qho), npib tsib xee, chromium, molybdenum, vanadium, silicon, thiab boron.Cov hlau tsis tshua muaj xws li txhuas, cobalt, tooj liab, cerium, niobium, titanium, tungsten, tin, zinc, lead, thiab zirconium.

Cov nram qab no yog ib tug ntau yam ntawm kev txhim kho cov khoom nyob rau hauv alloy steels (raws li piv rau carbon steels): lub zog, hardness, toughness, hnav tsis kam, corrosion kuj, hardenability, thiab kub hardness.Txhawm rau ua tiav qee yam ntawm cov cuab yeej txhim kho no cov hlau yuav xav tau kev kho cua sov.

Ib txhia ntawm cov no pom siv nyob rau hauv kab txawv thiab xav tau heev, xws li nyob rau hauv lub turbine hniav ntawm lub dav hlau cav, thiab nyob rau hauv nuclear reactors.Vim hais tias ntawm ferromagnetic zog ntawm hlau, qee cov hlau alloys pom cov ntawv thov tseem ceeb uas lawv cov lus teb rau cov hlau nplaum tseem ceeb heev, suav nrog hauv cov tshuab hluav taws xob thiab hauv transformers.

Kev kho cua sov ntawm Carbon steel qhov chaw

Spheroidizing
Spheroidite cov ntaub ntawv thaum carbon steel yog rhuab mus txog 700 ° C rau ntau tshaj 30 teev.Spheroidite tuaj yeem tsim ntawm qhov kub qis dua tab sis lub sijhawm xav tau nce siab, vim qhov no yog cov txheej txheem tswj kev sib kis.Qhov tshwm sim yog cov qauv ntawm cov pas nrig lossis spheres ntawm cementite nyob rau hauv thawj cov qauv (ferrite lossis pearlite, nyob ntawm seb sab twg ntawm eutectoid koj nyob).Lub hom phiaj yog kom soften dua carbon steels thiab tso cai ntau formability.Qhov no yog lub softest thiab feem ntau ductile daim ntawv ntawm steel.

Tag nrho annealing
Cov pa roj carbon steel yog rhuab mus txog 40 ° C saum toj no Ac3 lossis Acm rau 1 teev;Qhov no ua kom tag nrho cov ferrite hloov mus rau hauv austenite (txawm tias cementite tseem tuaj yeem muaj yog tias cov ntsiab lus carbon ntau dua li eutectoid).Cov hlau yuav tsum tau txias maj mam, hauv thaj tsam ntawm 20 ° C (36 ° F) ib teev.Feem ntau nws tsuas yog lub qhov cub txias xwb, qhov twg lub qhov cub tawg nrog cov hlau tseem nyob hauv.Qhov no ua rau cov qauv pearlitic ntxhib, uas txhais tau hais tias "bands" ntawm pearlite yog tuab.Tag nrho cov annealed steel yog mos thiab ductile, tsis muaj kev ntxhov siab sab hauv, uas yog feem ntau tsim nyog rau cov nqi tsim nyog.Tsuas yog spheroidized steel yog softer thiab ntau ductile.

Txheej txheem annealing
Cov txheej txheem siv los txo cov kev ntxhov siab hauv cov hlau ua haujlwm txias uas muaj tsawg dua 0.3% C. Cov hlau feem ntau yog cua sov rau 550-650 ° C rau 1 teev, tab sis qee zaum kub li 700 ° C.Daim duab sab xis [qhov xav tau kom meej] qhia txog thaj chaw uas cov txheej txheem annealing tshwm sim.

Isothermal annealing
Nws yog ib txoj hauv kev uas cov hlau hypoeutecoid yog rhuab saum toj qhov kub thiab txias.Qhov ntsuas kub no tau khaws cia rau ib lub sijhawm thiab tom qab ntawd txo qis kom qis dua qhov ntsuas kub tseem ceeb thiab rov ua dua.Tom qab ntawd nws yog txias rau chav tsev kub.Txoj kev no tshem tawm tej qhov kub thiab txias gradient.

normalizing
Cov pa roj carbon steel yog rhuab mus rau kwv yees li 55 ° C saum Ac3 lossis Acm rau 1 teev;Qhov no ua kom cov hlau hloov pauv mus rau austenite.Cov hlau yog tom qab cua txias, uas yog qhov cua txias ntawm kwv yees li 38 ° C (100 ° F) ib feeb.Qhov no ua rau ib tug zoo pearlitic qauv, thiab ib tug ntau-uniform qauv.Normalized steel muaj lub zog ntau dua li cov hlau annealed;nws muaj ib tug kuj siab zog thiab hardness.

Quenching
Cov pa roj carbon steel nrog tsawg kawg 0.4 wt% C yog rhuab mus rau normalizing kub thiab ces txias txias (quenched) nyob rau hauv dej, brine, los yog roj rau qhov tseem ceeb kub.Qhov ntsuas kub tseem ceeb yog nyob ntawm cov ntsiab lus carbon, tab sis raws li txoj cai dav dav yog qis dua thaum cov ntsiab lus carbon nce.Qhov no ua rau cov qauv martensitic;ib daim ntawv ntawm cov hlau uas muaj cov ntsiab lus super-saturated carbon nyob rau hauv ib tug deformed lub cev-centered cubic (BCC) crystalline qauv, zoo termed lub cev-centered tetragonal (BCT), nrog ntau sab hauv.Yog li quenched steel yog qhov nyuaj heev tab sis nkig, feem ntau yog nkig heev rau cov laj thawj.Cov kev ntxhov siab sab hauv no yuav ua rau muaj kev ntxhov siab tawg ntawm qhov chaw.Quenched steel yog kwv yees li peb zaug nyuaj (plaub nrog cov pa roj carbon ntau) dua li cov hlau qub.

Martempering (zeeg)
Martempering tsis yog ib txoj kev tempering, yog li lub sij hawm marquenching.Nws yog ib daim ntawv ntawm isothermal kev kho cua sov siv tom qab pib quench, feem ntau nyob rau hauv ib tug molten ntsev da dej, nyob rau hauv ib tug kub ntawm lub saum toj no lub "martensite pib kub".Ntawm qhov ntsuas kub no, cov kev ntxhov siab uas nyob hauv cov khoom tau txo qis thiab qee qhov bainite tuaj yeem tsim los ntawm cov austenite khaws cia uas tsis muaj sijhawm los hloov mus rau lwm yam.Hauv kev lag luam, qhov no yog txheej txheem siv los tswj cov ductility thiab hardness ntawm cov khoom.Nrog ntev marquenching, lub ductility nce nrog qhov tsawg kawg nkaus poob ntawm lub zog;cov hlau yog tuav nyob rau hauv qhov kev daws teeb meem no kom txog rau thaum lub puab thiab sab nraud kub ntawm qhov sib npaug.Tom qab ntawd cov hlau yog txias ntawm qhov nruab nrab ceev kom qhov kub thiab txias gradient tsawg.Cov txheej txheem no tsis tsuas yog txo cov kev ntxhov siab sab hauv thiab kev ntxhov siab tawg, tab sis nws kuj ua rau muaj kev cuam tshuam tsis zoo.

Tempering
Qhov no yog qhov kev kho cua sov tshaj plaws uas tau ntsib, vim tias cov khoom kawg tuaj yeem txiav txim siab los ntawm qhov kub thiab lub sijhawm ntawm tempering.Tempering muaj reheating quenched steel rau qhov kub thiab txias hauv qab eutectoid kub ces txias.Qhov kub siab tso cai rau me me ntawm spheroidite rau daim ntawv, uas rov ua kom ductility, tab sis txo qis hardness.Qhov kub thiab lub sij hawm tiag tiag yog ua tib zoo xaiv rau txhua qhov sib xyaw.

Austempering
Cov txheej txheem austempering yog tib yam li martempering, tshwj tsis yog lub quench cuam tshuam thiab cov hlau yog tuav hauv cov ntsev da dej ntawm qhov kub ntawm 205 ° C thiab 540 ° C, thiab tom qab ntawd txias ntawm tus nqi nruab nrab.Cov hlau ua tau, hu ua bainite, tsim cov acicular microstructure hauv cov hlau uas muaj lub zog zoo (tab sis tsawg dua martensite), ntau dua ductility, muaj kev cuam tshuam ntau dua, thiab tsis muaj kev cuam tshuam tsawg dua li martensite steel.Qhov tsis zoo ntawm austempering yog nws tuaj yeem siv rau ntawm ob peb lub steels xwb, thiab nws yuav tsum tau da dej tshwj xeeb ntsev.

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blackening kev kho mob

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qhov chaw nrog hexgon bar

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DIN gearing qhov chaw

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Carbon steel cnc turning parts with phosphating

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Bush parts with blackening treatment

Bush qhov chaw nrog
blackening kev kho mob


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