1. Dab tsi yog 4130 chromoly hlau, thiab dab tsi tshwj xeeb cov khoom ua "kub dov" daim ntawv thov?
AISI 4130 yog chromium - molybdenum (Chromoly) qis} Lub zog allloy, thiab nkees heev. Nws cov khoom qia los ntawm cov txheej txheem xaiv tshuaj lom neeg:
Cov pa roj carbon (0.28-0.33%): Muab cov khoom siv tsis yooj yim thiab lub zog tseem ceeb. Qib yog sib npaug los tswj kev weldability zoo.
Chromium (0.80-1.10%): Ua kom muaj zog dua (qhov tob uas cov hlau tuaj yeem ua tau zoo) thiab muaj kev tiv thaiv me corrosion.
Molybdenum (0.15-0.25%): Txhim kho lub zog nyuaj, txhim kho lub zog kub, thiab txo qhov kev pheej hmoo ntawm kev npau taws.
The Hot Rolled Bar form is produced by heating a steel billet to a high temperature (typically above 1700℃F / 925℃) and then passing it through a series of rolls to achieve the desired rectangular or square cross-section. Tus txheej txheem no txhais nws cov yam ntxwv tseem ceeb:
Tus nqi - ua tau zoo: {{{1} {rolling process ua tau, ua nws cov qauv nyiaj tshaj plaws ntawm 4130 bar Tshuag.
Decoupled lub zog thiab machinity: nws yog muab rau hauv ib qho kev tsis paub tab los yog qhov ua tau zoo li qub, feem ntau ~ 180 brinell). This makes it exceptionally machinable and formable compared to its pre-hardened or cold-finished counterparts. Lub Siab Zog 4130 yog lub npe hu ua tiav los ntawm kev kho cua sovtom qabMachining.
Nplai: Tus bar muaj tus yam ntxwv tsaus nti, ntxhib me ntsis "zeb nplai" saum npoo tshwm sim los ntawm high {}} kub oxidation. Cov nplai no yuav tsum tau muab tshem tawm ntawm pickling, txhaj tshuaj blasting, lossis machining rau ntau yam kev siv.
Cov Nqis Generies: Kub - rolled cov pob muaj dav rau kev thov uas muaj qhov chaw xaus rau kev machining.
Hauv cov ntsiab lus, lub 4130 kub- Rolled bar yog qhov pib zoo tshaj plaws rau cov khoom siv uas yuav ua kom tiav lawv qhov kawg siab- lub zog xeev.
2. Nyob rau hauv cov ntawv thov kev lag luam yog 4130 dov bar cov nyiam pib cov khoom?
Lub 4130 kub - rolled bar yog xaiv rau bricating siab qhov twg nws yuav tsum muaj zog thiab tawv yog qhov yuav tsum tau npaj tseg. Nws cov ntawv thov muaj thoob nyob thoob plaws hauv kev lag luam uas xav tau kev ua tau zoo thiab ntseeg tau.
Key sectors muaj xws li:
Aerospace thiab aviation: ib daim ntawv thov tseem ceeb. Nws yog siv rau cov cheebtsam tseem ceeb li tsaws iav qhov chaw, lub cav mounts, cov nkhaus qauv qauv, thiab airframe fittings. Cov ntu no yog machined los ntawm anealed bar thiab tom qab ntawd kub-}}}}}}}}}}}}}}} Kev kho kom tau lub zog siab thiab qaug zog lub neej.
Roj thiab roj Kev Lag Luam: Rau cov cheebtsam xws li lub cev valve, tho jigs, cuab pob qij txha, thiab cov cuab yeej siv hauv downhanole. Cov khoom siv lub zog thiab tawv yog qhov tseem ceeb nyob rau ib puag ncig uas xav tau no.
Automotive thiab motorsports: siv rau high -}} Kev ntxhov siab rau kev ncua (Axles, yob tawb mounting daim hlau, thiab lub zog loj. Nws lub peev xwm yuav raug muab khi thiab tom qab ntawd kub-}}}}}}}} {{- kev ua haujlwm.
General Machinery thiab cuab tam: raws li cov khoom siv rau cov phuam, pins, nkawm khau uas yuav tsum muaj zog dua li cov qauv hlau tuaj yeem muab tau. Nws lub tshuab luam ntawv hauv Annealed lub xeev yog qhov zoo rau kev tsim cov geometries complex.
Cov xov uas tau hais tias 4130 kub- rolled bar ua haujlwm raws li ib qho siab heev canvas "los ntawm qhov siab- Kev ua ke yog tsim los ntawm kev tsim cov txheej txheem txuas ntxiv.
3. Dab tsi yog cov txheej txheem kev kho cua sov txheem kev kho mob rau 4130, thiab lawv tau hloov pauv cov khoom ntawm kub kub} 2}} rolled bar?
Kev kho cua sov yog cov kauj ruam tseem ceeb uas hloov qhov muag muag, machinuin kub {{1}- lub zog, tawv tawv. Peb tus thawj cov txheej txheem yog:
Annealing:
Txheej txheem: Qhov bar yog rhuab mus rau qhov kub siab (feem ntau ib puag ncig 1600℃f / 870 degree) thiab tom qab ntawd maj mam txias rau hauv qhov cub cua.
Qhov txiaj ntsig: Ua cov khoom muag muag muag, feem ntau ntawm cov dav hlau nrog cov coarse hlaws micrubtructure. Qhov no yog lub xeev zoo tagnrho rau kev ua haujlwm hnyav.
Cov Hardness Nrov: ~ 150-190 HB.
Normalizing:
Txheej Txheem: Qhov bar yog rhuab saum toj nws qhov tseem ceeb kub (nyob ib ncig 1600℃f / 870 degree) thiab tom qab ntawd {txias.
Qhov tshwm sim: Ua kom tau cov qauv grain, ua rau muaj kev sib dhos ntau dua thiab txhim kho cov khoom siv mecha dua (lub zog dua thiab cov kev mob siab dua li qhov tseem ceeb dua). Nws yog feem ntau siv los ua ntej -}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}} Kev kho mob zaum kawg rau cov khoom siv zoo.
Lub Hardness Nrov: ~ 200 HB.
Quenching thiab tempering (Q & T):
Txheej Txheem: Qhov no yog ob - theem txheej txheem uas muab lub zog tshaj plaws thiab tawv.
Quenching: Ib feem yog rhuab rau nws cov Austenitizing kub (kwv yees . 1600℃f / 870 degree) thiab tom qab ntawd txias los ntawm kev raus nws hauv cov roj lossis dej. Qhov no ua ib qho nyuaj heev tab sis brittic martensitic qauv.
Tempering: Lub quenched ib feem yog rov qab ua rau ib qho tshwj xeeb, qis dua} Cov℃- 650 degree), tuav, thiab tom qab ntawd} txias. Cov kauj ruam no txo cov brittleness thiab relieves sab hauv kev ntxhov siab, ua tiav qhov kev tshuav nyiaj li cas ntawm lub zog thiab tawv.
Qhov tshwm sim: Qhov kawg hardness thiab lub zog yog ncaj qha tswj tau los ntawm qhov ntsuas kub. Qhov qis dua tempering kub dua zog thiab qis dua zog, thaum lub sij hawm siab tempering kub siab dua thiab muaj zog dua.
Lub hardness tsis zoo: tuaj yeem ua kom haum los ntawm 25 hrc rau 40+ hrc.
For a component machined from a hot-rolled bar, the standard sequence is: Machine in the Annealed/Normalized state ->Ua quenching thiab tempering rau cov yam ntxwv kawg.
4. Dab tsi yog qhov kev txiav txim siab tseem ceeb rau machining thiab vuam 4130 kub- rolled bar?
Kev ua tiav zoo ntawm 4130 yuav tsum tau kev nkag siab txog nws tus cwj pwm thaum tshuab ua haujlwm thiab vuam los tiv thaiv nws cov khoom.
Machining kev txiav txim siab:
Mob yog qhov tseem ceeb: hauv nws cov khoom siv anealed / Qub lawm, zoo ib yam li 1020 steel tab sis nrog cov nti tsim kom zoo dua. Txawm li cas los xij, nws lub zog siab dua yuav tsum muaj zog ntau dua li cov hlau me me.
Tooling thiab cov tsis muaj: Siv ntse, zoo- ray tating. Cov ntxig carbide tau pom zoo rau kev tsim khoom. Ua haujlwm ntsuas nrawm thiab txau nrog lub siab dav dav txias los tswj tshav kub thiab txuas ntxiv cuab lub neej.
Vuam kev txiav txim siab (yuav tsum tau ua nruj ua nruj):
VUAM 4130 yog ib qho muaj tab sis yuav tsum tau ua nrog kev saib xyuas kom tsis txhob tawg hauv qhov kub- bein cuam tshuam thaj chaw (Hz).
Pre6 - cua sov (tseem ceeb heev): rau ntu tshaj 1/4 nti (6mm)}}℃f (150}} degree). Qhov no ua rau qeeb qeeb tus nqi txias tom qab vuam, tiv thaiv kev tsim ntawm nyuaj, brittle martensite hauv lub haz.
CATER HLAU XAIV:
Rau kev sib txuam muaj zog: Siv qhov qis - hydrogen filter zoo li Aws er80 2}} d2 rau tig lossis e8018-B2 rau cov vuam vuam.
Rau kev txhim kho tawg tiv thaiv: rau cov pob qij txha tseem ceeb lossis muaj kev pab sib koom tes, ib qho kev ua kom muaj kev sib koom ua ke stainless hlau former zoo li Aws Er309L feem ntau nyiam. Nws lub siab ua qauv siab pab nqus cov vuam kev nyuaj siab yam tsis muaj kev tawg.
Tshaj tawm - Weld Kev Kho Tshav Kub (Pwht {{ Ua kom sov tag nrho cov sib dhos rau 1100℃f {{4 4}}℃f (595℃{}} degree), tuav, thiab cua txias txias. Cov tempers no lub siab loj loj, rov kho txoj kev nruj, thiab daws cov kev ntxhov siab tsis zoo uas tuaj yeem ua rau qaug zog tsis ua haujlwm.
5. Yuav ua li cas 4130 kub dov bar piv rau lwm cov qib steel li 1018 thiab 4140?
The choice between these grades is a classic trade-off between cost, strength, weldability, and hardenability.
vs . 1018 (cov hlau tsis muaj roj av):
Lub zog: 4130 yog muaj zog heev. Txawm tias ib txwm ua, 4130 muaj qhov muaj txiaj ntsig ntau dua thiab lub zog tensile. Tom qab kev kho cua sov, qhov txawv yog loj.
HardenTability: 1018 tsis tau dhau los ntawm -} hastened ho; Nws tuaj yeem tsuas yog rooj plaub hardened. 4130}}}}}}}}}}}}}}}}}}}}} section for for section for compon້ນ zoo li Axles.
Tus nqi: 1018 tsis tshua kim kim .... 4130 yog xaiv thaum lub zog ntawm 1018 tsis txaus.
vs . 4140 (nruab nrab carbon chromoly):
Composition: 4140 muaj cov ntsiab lus carbon ntau dua (0.38-0.43%) thiab me ntsis ntau molybdenum.
HardenTability thiab lub zog: 4140 muaj kev nyuaj dua thiab muaj zog ntau dua 4130. Qhov no ua rau nws muaj qhov loj dua 4130. Qhov no xav tau cov kev hnav khaub ncaws hnyav.
Weldability: qhov no yog tus tshaj tawm tseem ceeb . 4130 yog feem ntau suav nrog kev weldability zoo dua li 4140 vim nws cov ntsiab lus roj carbon ntau dua. Kev pheej hmoo ntawm kev tsim brittle martensite nyob rau hauv lub haz yog qis dua nrog 4130, ua rau nws muaj kev nyab xeeb dua rau cov fab sib luag.
Ntsiab lus: Xaiv 1018 rau Tsawg - lub zog, qis- tus nqi feem. Xaiv 4130 rau siab - lub zog, welded, thiab fabricated sib xyaw uas yuav tsum tau sib npaug ntawm cov khoom thiab weldability. Xaiv 4140 rau lub zog siab tshaj plaws thiab hnav tsis kam nyob hauv cov ntu loj dua, qhov twg vuam tsis yog qhov kev txhawj xeeb thawj lossis tuaj yeem tswj hwm thawj zaug lossis muaj peev xwm nruj me ntsis.
