Cov pa roj carbon steel yog hlau alloyed nrog carbon, thiab nws tus cwj pwm yog tswj hwm los ntawm cov ntsiab lus carbon. Plaub hom pa roj carbon monoxide ntau ntxiv, yog cov pa roj carbon tsawg, cov pa roj carbon tsawg, cov pa roj carbon siab thiab ultra- siab carbon steel. Cov ntsiab lus carbon nce lub zog thiab hardness tab sis txo qis ductility, toughness thiab weldability, uas yog vim li cas cov khoom xaiv ib txwm muaj qhov sib npaug es tsis yog kev sib tw rau ntau tshaj plaws.
Plaub Hom Carbon Steel
| Hom | Cov ntsiab lus carbon | Yam khoom | Kev siv |
| Tsawg carbon (me me steel) | Tsawg dua 0.3% | Mos, ductile, yooj yim welded thiab tsim | Cov qauv ntu, cov kav dej, lub cev tsheb, kev tsim khoom dav dav |
| Nruab nrab carbon | 0.3-0.6% | Sib npaug ntawm lub zog thiab ductility | Gears, axles, shafts, tshuab qhov chaw |
| Cov pa roj carbon ntau | 0.6-1.0% | Hard, hnav resistant, tsawg ductile | Springs, xov hlau, tej cuab yeej txiav, ntsia |
| Ultra{0}} siab carbon | 1.0-2.0% | Nyuaj heev thiab nkig | Tuag, xuas nrig ntaus, tshwj xeeb txiav ntug |
Yuav ua li cas Rail Steel Classified
Rail steel yog tsim nyob rau hauv peb tsev neeg. Cov pa roj carbon monoxide yog smelted thiab dov los ntawm cov hlau ore -raws li cua sov, tso siab rau carbon thiab manganese rau lub zog; ib tug zoo tib yam rail hlau muaj roughly 0.40-0.80% carbon nrog manganese ntawm li 1.0-1.4%. Alloy rails ntxiv me me ntawm alloying ntsiab xws li vanadium, titanium, chromium los yog niobium los txhawb zog thiab toughness tshaj cov qib carbon. Thaum tshav kub kub kho rails yog carbon los yog alloy rails uas yog rhuab thiab ces txias nyob rau hauv kev tswj tej yam kev mob los kho cov pearlite qauv; lub taub hau rail tsim ib txheej hardened uas zoo heev txhim kho hnav tsis kam thiab ncua kev pab cuam lub neej.
Suav Rail Qib thiab Mechanical Properties
Kub-rolled rails (GB/T 2585)
| Qib | Tensile zog (MPa) | Hardness (HB) |
| U75V | yam 980 | 280-320 |
| ua 78crv | yam tsawg kawg yog 1080 | 310-360 |
| ua 76kr | yam tsawg kawg yog 1080 | 310-360 |
| U77MnCr | yam 980 | 290-330 |
Thaum tshav kub kub- kho cov kab
| Qib | Tensile zog (MPa) | Hardness (HB) |
| U75V (kub kho) | yam tsawg kawg yog 1180 | 320-380 |
| U78CrV (kub kho) | yam tsawg kawg yog 1280 | 370-420 |
Cov tsev neeg European thiab UIC siv lawv tus kheej lub npe: R260 thiab R350HT raws li EN 13674-1, thiab 700, 900A thiab 1100 qib hauv UIC 860, qhov twg tus lej yog qhov tsawg kawg nkaus tensile lub zog hauv MPa.
Xaiv Txoj Cai Rail Steel
Xaiv cov qib los ntawm kev khiav tsheb: hnyav qag loads thiab cov nkhaus nkhaus xav tau nyuaj dua, siab dua - lub taub hau lub zog, uas yog qhov chaw tshav kub - kho cov ntsia hlau tau txais lawv cov nqi. Ncaj, maj mam thauj cov kab tuaj yeem khiav cov qauv carbon qib ntawm tus nqi qis. Weldability kuj tseem ceeb: siab- carbon thiab alloy rails yuav tsum tau tswj cov txheej txheem vuam, thiab cov rail cov tshuaj muaj pes tsawg leeg yuav tsum tau sib xws nrog cov txheej txheem vuam siv nyob rau hauv qhov project. Rau fastening Cheebtsam, caij nplooj ntoos hlav steels xws li 60Si2MnA zaum nyob rau hauv siab - carbon ntau, thiab clip hardness tom qab kev kho cua sov yog feem ntau 42-50 HRC.
Kev Ntseeg Tsis Zoo
Cov pa roj carbon ntau dua tsis tuaj yeem ua tau zoo dua: ultra- cov pa roj carbon ntau yog nkig rau cov qauv thiab qhov chaw tsis muaj zog. Rails tsis yog ua los ntawm cov pa roj carbon tsawg, uas yuav hnav tawm hauv lub hlis. Thiab cov kab lus alloy hlau tsis txhais hais tias stainless hlau: alloying ntsiab yog ntxiv nyob rau hauv feem pua me me los txhim kho lub zog thiab toughness, tsis yog rau corrosion kuj.
FAQ
Vim li cas rail steel ib txwm siab carbon?
Vim tias lub taub hau tsheb ciav hlau yuav tsum tiv taus hnav thiab lub tsheb ciav hlau tag nrho yuav tsum tiv thaiv kev khoov thiab qaug zog. Cov pa roj carbon ntau muab cov hardness thiab lub zog yuav tsum tau, thaum cov qib carbon thiab manganese tshwj xeeb yog tuned rau weldability thiab toughness.
Dab tsi yog qhov txawv ntawm carbon rail thiab alloy rail?
Carbon rail cia siab rau carbon thiab manganese rau lub zog; alloy rail ntxiv me me ntawm vanadium, titanium, chromium los yog niobium los thawb lub zog thiab toughness siab dua.
Kev kho cua sov ua li cas rau txoj kev tsheb ciav hlau?
Kev tswj cua sov thiab cua txias ua kom zoo dua cov qauv pearlite thiab tsim cov txheej txheem tawv tawv ntawm lub taub hau tsheb ciav hlau, feem ntau tsa lub zog tensile los ntawm 150-200 MPa thiab ua kom zoo dua hnav lub neej ntawm txoj kev nkhaus.
Puas yog U75V zoo dua U71Mn?
U75V muaj zog dua thiab zoo dua hnav tsis kam thiab yog ib qho kev xaiv rau hnyav -haul thiab siab - kab ceev. U71Mn tseem siv dav rau cov kab sib xws uas nws qhov kev sib tw thiab cov nqi sib npaug zoo.
Cov pa roj carbon ntau puas tuaj yeem welded yooj yim?
Tsis yog. High carbon steels xav tau kev tswj hwm preheat, tsim nyog cov txheej txheem thiab tom qab-weld soj ntsuam, uas yog vim li cas rail welding (flash taub qab, thermite los yog aluminothermic) yog ib tug tshwj xeeb kev khiav hauj lwm nrog kev pom zoo tsis.
Lub caij nplooj ntoos hlav clips yuav tsum muaj hardness dab tsi?
Railway caij nplooj ntoos hlav clips feem ntau quenched thiab tempered rau 42-50 HRC. Tsawg hardness yuav ua rau cov yas deformation thiab poob ntawm ntiv taw load; siab dua hardness txaus ntshai brittle puas nyob rau hauv kev cuam tshuam.