Dab tsi yog qhov hardness ntawm railway rail?
Jan 21, 2026
Qhov Hardness ntawm Railroad Rail yog dab tsi?
Rail hardness yog cov cuab yeej uas ncaj qha tswj kev hnav tus nqi thiab, dhau los, lub neej ntawm txoj kev tsheb ciav hlau. Standard kub-rolled pearlitic rails ntsuas roughly 240-300 HBW ntawm qhov chaw khiav, thaum lub taub hau-hardened rails rau hnyav-haul thiab ntse nkhaus ntsuas 350-390 HBW. Tus nqi hardness tus neeg yuav khoom yuav tsum qhia meej nyob ntawm txoj kab tsheb yuav nqa, tsis yog ntawm ib daim duab universal.
Hom Hardness Values los ntawm Qib
| Qib | Txuj | Hom | Hardness (HBW) |
|---|---|---|---|
| ua 71mn | GB 2585-2007 | Raws li -rolled pearlitic | 240-270 (ntev) |
| U75V | GB 2585-2007 | Raws li -rolled pearlitic | 280-320 (ntev) |
| R260 | TS EN 13674-1 | Raws li -rolled pearlitic | 260 yam tsawg kawg nkaus ntawm qhov chaw khiav |
| R350 HT | TS EN 13674-1 | Lub taub hau- tawv | 350-390 |
| U75VH / U71MnH | Thaum tshav kub kub-kho ib TB/T 2344 | Lub taub hau- tawv | 340 lossis siab dua (tus qauv) |
Cov txiaj ntsig saum toj no yog cov lej cov neeg yuav khoom tau pom hauv cov qauv thiab daim ntawv pov thawj zeb. Nco ntsoov tias daim duab ntawm 350-450 HBW tau thov rau dawb raws li - dov U71Mn tsis tau txais kev txhawb nqa los ntawm qib specification; raws li - dov U71Mn zaum ntawm 240-270 HBW. Tus nqi ntawm 350 HBW thiab siab dua yog cov taub hau-tawv tawv, yog li qib thiab kev kho mob yuav tsum tau teev ua ke ntawm qhov kev txiav txim.
Rail Hardness ntsuas li cas
Tus txheej txheem yog Brinell xeem nrog tungsten -carbide pob indenter, qhia hauv HBW. Lub indentation yog ua rau ntawm qhov chaw khiav los yog nyob rau sab ntawm lub taub hau tsheb ciav hlau, ntawm ib txoj hauj lwm uas tau hais tseg, thiab kev nyeem ntawv yog qhov nruab nrab ntawm ntau qhov indentations. Hauv thaj teb, cov cuab yeej siv tau yooj yim xws li Leeb lossis Equotip rebound cov cuab yeej siv rau kev sib piv, tab sis qhov kev lees txais daim ntawv cog lus yuav tsum yog Brinell daim duab los ntawm lub zeb.
Dab tsi Tswj Rail Hardness
Cov ntsiab lus carbon thiab alloy
Cov pa roj carbon ntau dua thiab cov hlau me me ntxiv xws li vanadium nce qhov hardness ntawm pearlitic qauv. Qhov no yog vim li cas U75V khiav nyuaj dua U71Mn.
Kev kho cua sov
Lub taub hau hardening, siv los ntawm kev tswj cua txias ntawm lub taub hau tsheb ciav hlau tom qab dov, nqa kev khiav -nto hardness rau 350-390 HBW thaum ua kom lub vev xaib thiab ko taw hnyav dua. Txoj kev hloov pauv ntawm lub taub hau tawv thiab lub vev xaib softer yog ua tib zoo tswj kom tsis txhob nkig tsis ua haujlwm.
Rolling thiab kev ua kom txias
Tswj txias tom qab dov refines pearlite thiab tsa hardness tsis poob toughness. Cov cua txias tsis zoo tuaj yeem pom cov hlua mos uas hnav rau hauv corrugations.
Vim li cas Hardness Matters rau hnav thiab sib tsoo
Hnav ntawm cov kab nkhaus nrog qhov sib txawv hardness ntawm lub log thiab cov tsheb ciav hlau. Cov tsheb ciav hlau hnyav hnyav hnyav dua rau ntawm qhov ntsuas lub kaum ntse ntse thiab qhov chaw khiav, uas txuas ntxiv lub sijhawm ntawm kev sib tsoo tsheb ciav hlau thiab thaum kawg lub neej ntawm txoj kev tsheb ciav hlau. Kev ua lag luam tawm tswv yim-tawm yog tias cov tsheb ciav hlau nyuaj ntau dua rau cov kab nrib pleb los ntawm dov-kev tiv thaiv kev qaug zog, yog li cov phiaj xwm saib xyuas yuav tsum suav nrog kev tshuaj xyuas ultrasonic thiab sib tsoo.
Daim ntawv teev cov neeg yuav khoom kom paub meej hardness
Qhia qib thiab kev kho mob ua ke, piv txwv li U75V raws li -rolled los yog R350HT taub hau- hardened.
Yuav tsum tau Brinell (HBW) qhov tseem ceeb ntawm daim ntawv pov thawj zeb, nrog rau qhov ntsuas qhov ntsuas.
Match hardness rau tsheb: 240-300 HBW rau cov tsheb sib xyaw, 350-390 HBW rau hnyav-haul thiab ntse nkhaus.
Nug rau qhov kev hloov pauv -zone hardness profile ntawm lub taub hau-hardened rails kom paub meej tias kev kho cua sov zoo ib yam.
FAQ
Dab tsi hardness yog standard railroad rail?
Txheem raws li -rolled pearlitic rails feem ntau yog 240-300 HBW ntawm qhov chaw khiav, piv txwv li U71Mn ntawm 240-270 HBW lossis R260 yam tsawg kawg ntawm 260 HBW.
Dab tsi yog qhov nyuaj ntawm lub taub hau -hardened rail?
Lub taub hau- cov hlua tawv tawv xws li R350HT ntsuas 350-390 HBW ntawm qhov chaw khiav, kwv yees li 40% nyuaj dua li cov qauv tsheb ciav hlau.
Vim li cas rail hardness qhia hauv HBW?
HBW yog Brinell hardness scale siv lub tungsten -carbide pob indenter, cov txheej txheem teev nyob rau hauv cov qauv kev tsheb nqaj hlau xws li EN 13674-1 thiab GB 2585 rau kev lees paub.
Puas nyuaj rail ib txwm txhais tau tias lub neej ntev?
Tsis tau. Cov tsheb ciav hlau hnyav dua hnav qeeb dua tab sis muaj kev cuam tshuam ntau dua rau kev dov -nrog kev qaug zog thiab xav tau kev sib tsoo thiab tshuaj xyuas. Qhov zoo tshaj plaws hardness nyob ntawm lub qag load, ceev thiab curvature.
Kuv tuaj yeem tshawb xyuas qhov hardness ntawm kev xa khoom li cas?
Siv Brinell qhov tseem ceeb ntawm daim ntawv pov thawj zeb xeem raws li cov ntaub ntawv lees paub. Portable rebound hardness testers muaj txiaj ntsig zoo rau kev kuaj xyuas qhov chaw thaum lub sijhawm teeb tsa, tab sis lawv yog qhov sib piv ntau dua li kev lees paub- qib.
