Rau lub sijhawm ntev, feem ntau siv qib steel rau cov tsheb thauj khoom hauv kuv lub tebchaws yog 20CrMnTi. Qhov no yog qhov nruab nrab lub tsheb iav 18XTr steel (piv txwv li 20CrMnTi steel) qhia los ntawm qub Soviet Union hauv xyoo 1950. Cov hlau muaj cov nplej zoo, cov nplej me me thaum lub sij hawm carburizing, zoo carburizing thiab quenching zog, thiab tuaj yeem ncaj qha quenched tom qab carburizing. Cov ntaub ntawv qhia tau hais tias ua ntej xyoo 1980, kuv lub teb chaws carburized alloy structural steel (xws li 20CrbinTi steel) tsuas yog lav cov tshuaj muaj pes tsawg leeg ntawm cov hlau thiab cov khoom siv kho tshuab ntsuas los ntawm cov qauv thaum cov hlau tawm hauv lub Hoobkas, tab sis cov tshuaj muaj pes tsawg leeg thiab cov khoom siv tshuab feem ntau. tshwm sim nyob rau hauv zus tau tej cov tsheb. Rau cov hlau tsim nyog, cov khoom zoo raug cuam tshuam vim qhov hloov pauv loj ntawm hardenability. Piv txwv li, yog hais tias lub hardenability ntawm 20CrMnTi carburized steel yog tsawg dhau lawm, cov tub ntxhais hardness ntawm lub iav tom qab carburizing thiab quenching yuav qis dua tus nqi teev nyob rau hauv cov kev ua hauj lwm tej yam kev mob, thiab qaug zog lub neej ntawm lub iav yuav raug txo los ntawm ib nrab thaum lub sij hawm. qaug zog kuaj; Yog hais tias lub hardenability siab dhau lawm Yog hais tias nws yog siab dhau lawm, lub shrinkage ntawm lub puab qhov tom qab carburizing thiab quenching ntawm lub iav yog loj heev, uas yuav cuam tshuam rau lub iav los ua ke.
Txij li thaum lub hardenability ntawm steel muaj ib qho tseem ceeb heev cuam tshuam rau hardness thiab distortion ntawm lub iav hniav core, nyob rau hauv 1985, lub Ministry of Metallurgy tshaj tawm kuv lub teb chaws cov kev cai rau guaranteed hardenability structural steel (GB5216-85), uas yog suav nrog. nyob rau hauv no technical mob. Cov tshuaj muaj pes tsawg leeg thiab cov ntaub ntawv hardenability ntawm 10 hom carburized steels nrog rau 20CxMnTiH thiab 20MnVBH steels tau txais. Tus qauv qhia tias qhov hardenability Performance index ntawm 20CrMnTi steel siv rau kev tsim cov iav yog 30-42HRC ntawm qhov deb ntawm 9 kas fes los ntawm cov dej txias kawg. Tom qab ntawd, cov teeb meem ntawm cov hardness tsawg dhau thiab loj heev distortion nyob rau hauv cov hniav chaw ntawm lub zog uas tsim los ntawm kev siv 20CrMnTi steel tau pib daws. Txawm li cas los xij, nws yog qhov tsis tsim nyog siv tib qib steel 20CrMnTi tsis hais qhov loj ntawm lub iav module thiab thickness ntawm cov hlau seem. Vim yog kev txhim kho cov hlau smelting technology hauv kuv lub teb chaws thiab kev txhim kho cov khoom siv hlau alloy, nws muaj peev xwm ua tau kom nqaim ntxiv cov hardenability band ntawm iav steel thiab txhim kho nws raws li qhov yuav tsum tau muaj ntawm cov khoom sib txawv (xws li cov khoom sib kis. thiab rear qag gears, thiab lwm yam). Cov qib steel tshiab kom tau raws li nws cov kev xav tau.
Los ntawm kev sib tham nrog steel mills, nyob rau hauv 1997, Changchun FAW successively kos npe rau ib daim ntawv cog lus nrog cov manufacturers ntawm iav steel mills los muab lub hardenability ntawm 20CrMnTi steel nyob rau hauv batch. Cov pab pawg hardenability ntawm 20CrMnTiH steel siv rau thawj ncej, nruab nrab ncej iav ntawm lub me me kis tau tus mob thiab lub ntsiab thiab tsav bevel zog ntawm lub rear qag nrog loj cross-sectional qhov ntev yog kuv thiab II, raws li, thiab cov sib thooj hardenability yog J9: 30-36HRC thiab J9=36-42HRC.
Nyob ib ncig ntawm 1960, vim yog cov khoom siv nruj ntawm nickel thiab chromium hlau hauv Suav teb, kev tsim cov nickel thiab chromium hlau hauv kuv lub tebchaws tau cuam tshuam. Lub sijhawm ntawd, kuv lub teb chaws kev lag luam tsheb yog cov cuab yeej siv los ntawm cov qub Soviet Union, thiab Soviet Union tau siv ntau cov hlau uas muaj cov nickel thiab chromium. Yog li ntawd, thaum lub sij hawm ntawd, kuv lub teb chaws txoj kev lag luam tsheb tau siv zog tsim kev tsim kho thiab kev tshawb fawb ntawm boron steel, thiab siv 20MnVB thiab 20Mn2TiB steel los hloov 20CrMnTi carburized steel los tsim cov iav. Qhov no yog vim hais tias ntxiv ib qho nyiaj ntawm boron (0.0001 feem pua -0.0035%) rau cov qauv hlau tuaj yeem txhim kho qhov hardenability ntawm cov hlau, yog li ntxiv cov kab ntawm boron rau cov hlau tuaj yeem hloov tau qee yam ntawm cov hlau. Muaj nuj nqis alloying ntsiab xws li manganese, npib tsib xee, chromium, molybdenum, thiab lwm yam. Yog li ntawd, boron steel yog dav siv. Changchun FAW tau siv 20MnTiB thiab 20Mn2TiB steels hauv kev tsim khoom ntawm "Jiefang" hom tsheb iav.
Lub "Dongfeng" hom 5 uas tsim los ntawm Dongfeng Motor Corporation yog ua los ntawm 20CrMnTi thiab 20MnVB steel rau kev sib kis thiab rear qag iav ntawm lub tsheb. Ib yam li ntawd, ib daim ntawv cog lus tau kos npe nrog lub zeb zeb kom nqaim lub hardenability band ntawm cov hlau thiab muab nws nyob rau hauv batch. Cov steels siv rau lub ntsiab thiab tsav bevel gears ntawm kis tau tus mob thiab rear qag yog 20CrMnTiH(3), 20MnVBH(2), thiab 20MnVBH(3), raws li, thiab cov hardenability yog J9=32-39HRC thiab J{ {10}}HRC, J9=34 ~42HRC.
kuv lub teb chaws Qijiang Gear Factory qhia lub tuam txhab German lub tsheb hnyav kis tau tus mob iav ntau lawm tshuab, thiab ua tiav kev sim-tsim lub tuam txhab Cr-Mn-B series boron-muaj iav hlau raws li lub tuam txhab German cov qauv. Lub hardenability ntawm cov khoom siv iav yog J10=31-39HRC
spur iav
Tau kawg, 20CrMnTi steel, 20MnTiB steel, 20MVB steel thiab lwm yam boron-muaj steels kuj muaj qhov tsis zoo. Nws yog feem ntau ntseeg tias 20CrMnTi thiab lwm yam carburized steels yog qhov tseem ceeb zoo-grained steels, thiab cov nplej yuav tsis coarsened tom qab carburizing, thiab tuaj yeem ncaj qha quenched. Tab sis qhov tseeb, vim muaj kev cuam tshuam ntawm steel smelting zoo, grain coarsening feem ntau tshwm sim nyob rau hauv ib txwm muaj mob. Qhov tseeb ntawm cov nplej loj ntawm ntau cov khoom siv tau pom tias feem ntau ntawm cov qoob loo tiag tiag tsuas yog 2-3 qib (nyob rau hauv qhov xwm txheej ntawm 930 degree kev txuag hluav taws xob rau 3h). Cov ntaub ntawv ntseeg tau hais tias vim yog cov ntsiab lus siab ntawm Ti, 20CrMnTi muaj ntau TiN suav nrog hauv cov hlau, tshwj xeeb tshaj yog cov TiN loj suav nrog yog qhov ua rau qaug zog ntawm cov iav qaug zog, thiab nws lub neej yuav txo qis kev sib cuag qaug zog ntawm lub zog. Cov inclusions muaj ib tug cubic qauv thiab yog nquag mus cleavage thiab cracking thaum raug quab yuam, ua rau thaum ntxov tsis ua hauj lwm ntawm lub iav. Lwm qhov teeb meem yog tias qhov hardenability ntawm cov hlau no yog txwv, thiab nws tsis tuaj yeem ua tau raws li qhov yuav tsum tau muaj ntawm cov kab loj loj thiab loj-modulus zog. Qhov tob ntawm cov txheej txheem hardened carburizing thiab hardness ntawm cov tub ntxhais tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua ntawm cov khoom hnyav. Tsis tas li ntawd, 20CrMnTi hlau yog nquag oxidation sab hauv thiab cov qauv uas tsis yog martensitic thaum kho cua sov, uas txo cov qaug zog lub neej ntawm lub zog. Tab sis nyob rau hauv peb lub teb chaws iav carburizing hlau, tsis muaj hom hlau li paub tab thiab txhim khu kev qha raws li 20CrMnTi hlau hauv cov txheej txheem carburizing. Yog li ntawd, nws tseem yog cov feem ntau siv carburizing steel hauv Suav teb. Boron steels xws li 20MnVB, 20MnTiB thiab 20Mn2TiB kuj muaj qee qhov tsis txaus. Piv txwv li, vim tsis zoo deoxidation thiab denitrification thaum smelting, boron tsis tuaj yeem ua lub luag haujlwm hauv kev ua kom tawv nqaij. Yog li ntawd, kev ua haujlwm ntawm boron steel tsis ruaj khov. Lub iav distortion nce thiab cuam tshuam qhov zoo ntawm cov khoom. Nyob rau tib lub sijhawm, vim tias cov hmoov nplej sib xyaw thiab cov nplej zom tau yooj yim rau cov ntxhib, qhov deformation tsis yooj yim rau kev tswj thiab lub toughness tsis zoo, thiab cov hauv paus hniav ntawm boron steel iav yog nquag tsim cov qauv trosteite thiab dub mesh thiab siv tawv dub. ntawm carbonitriding iav. Yog li ntawd, ntau lub tuam txhab txiav txim siab siv cov hlau no. Txawm li cas los xij, nws yuav tsum tsis txhob txiav txim siab tias boron steel tsis haum rau iav carburizing hlau. Carburized steel uas muaj boron kuj siv txawv teb chaws. Piv txwv li, lub tuam txhab nto moo IV iav nyob rau hauv lub teb chaws Yelemees tau siv tshwj xeeb steel qib ZF7 formulated los ntawm nws tus kheej lub Hoobkas, uas yog ib tug tsawg-carbon chromium-manganese hlau uas muaj boron. Lub ntsiab chemical Cheebtsam (mass feem, feem pua) ntawm cov hlau yog 0.15-0.20C, 0.15-0.40S, 1.0-1.3Cr, 1.{{33} }.3Mn, 0.001-0.003B. Qee lub tsheb kis tau tus mob hauv Asmeskas thiab lub tsheb qag lub ntsiab thiab lub zog tsav tsheb kuj tseem siv boron-muaj carburized steel, xws li 50B15, 43BVl4 thiab 94B17. Yog li ntawd, ntev li ntev raws li kev siv tshuab smelting ntawm steel mills khaws cia, cov teeb meem saum toj no ntawm boron steel tuaj yeem daws tau.
Kev ua ntawm 20CrMnTiH, 20MnVBH thiab 20MnTiBH steel iav forging billets nyob rau hauv ib tug nruam isothermal normalizing rauv tuaj yeem ua kom muaj kev sib faib ntawm flake pearlite ntxiv rau ferrite. Nyob rau hauv txoj kev no, kev kho cua sov distortion ntawm lub iav tuaj yeem txo qis heev, qhov tseeb ntawm cov iav tuaj yeem txhim kho, thiab kev pabcuam lub neej ntawm cov iav tuaj yeem ua kom ntev.
Lub isothermal normalizing hardness ntawm iav forging dawb paug yog 156-207HB
