S275JR structural yeeb nkab yog cov carbon steel qauv ua raws li European tus qauv EN 10025-2, belongs rau qis- alloy high-strength structural steel. Hauv nws lub npe:
"S" qhia cov qauv hlau;
"275" qhia nws qhov tsawg kawg nkaus tawm lub zog yog 275 MPa;
"JR" qhia tias muaj kev cuam tshuam zoo ntawm 20 degree, nrog lub zog cuam tshuam ntau dua lossis sib npaug li 27 J.
Tshuaj muaj pes tsawg leeg
Cov tshuaj muaj pes tsawg leeg ntawm S275JR steel yeeb nkab sib txawv nyob ntawm qhov tuab ntawm cov hlau phaj, tab sis feem ntau ua raws li cov qauv no (siv cov tuab tsawg dua lossis sib npaug li 40mm raws li piv txwv):
Cov pa roj carbon (C): Tsawg dua lossis sib npaug li 0.21% Cov ntsiab lus carbon tsawg ua kom zoo weldability thiab txias ua haujlwm ntawm cov hlau.
Manganese (Mn): Tsawg dua lossis sib npaug li 1.50% Manganese yog ib qho tseem ceeb ntxiv dag zog rau cov hlau uas ua kom muaj zog thiab tawv tawv ntawm cov hlau, thaum tseem txhim kho kev ua haujlwm kub.
Phosphorus (P): Tsawg dua los yog sib npaug li 0.035% Cov ntsiab lus phosphorus ntau dhau yuav txo tau qhov toughness thiab weldability ntawm hlau thiab yuav tsum tau tswj nruj me ntsis.
Sulfur (S): Tsawg dua lossis sib npaug li 0.035% Cov ntsiab lus sulfur ntau dhau tuaj yeem ua rau kub brittleness hauv cov hlau thaum ua haujlwm kub thiab nws cov ntsiab lus yuav tsum txwv.
Nitrogen (N): Tsawg dua lossis sib npaug li 0.012% Cov ntsiab lus nitrogen ntau dhau cuam tshuam rau qhov toughness thiab weldability ntawm hlau.
Tsis tas li ntawd, qee qhov tshwj xeeb ntawm S275JR steel kav kuj muaj me me ntawm alloying ntsiab xws li tooj liab (Cu) los txhim kho lawv cov corrosion kuj.
Mechanical Properties
S275JR steel daim hlau muaj cov hauv qab no cov khoom tseem ceeb:
Yield Strength (Re): Ntau dua los yog sib npaug rau 270 MPa (rau thickness Tsawg dua los yog sib npaug rau 16mm), me ntsis txo nrog nce thickness (xws li, Ntau tshaj los yog sib npaug rau 265 MPa rau 40mm thickness).
Qhov no qhia tau hais tias qhov kev ntxhov siab tsawg kawg nkaus uas cov hlau pib dhau mus tas li deformation.
Tensile Strength (Rm): 430-580 MPa Reflects cov hlau muaj peev xwm tiv thaiv puas; siab zog tensile txhais tau hais tias muaj peev xwm load-bearing ntau dua.
Elongation tom qab tawg (A): Ntau dua lossis sib npaug li 14% (qee qhov chaw qhia tias Ntau dua lossis sib npaug li 23%, uas tej zaum yuav cuam tshuam rau cov qauv ntsuas lossis steel phaj tuab)
Qhov no qhia txog cov hlau cov yas deformation muaj peev xwm ua ntej tawg; siab elongation qhia tau hais tias zoo plasticity.
Impact toughness (KV₂): Lub zog cuam tshuam ntau dua lossis sib npaug ntawm 27 J ntawm 20 degree
Qhov no qhia tau hais tias cov hlau muaj peev xwm tiv thaiv qhov cuam tshuam ntawm cov khoom hauv chav tsev kub, ua kom muaj kev nyab xeeb ntawm cov qauv hauv qab dynamic loads.
Kev xa khoom thiab kev ua haujlwm
S275JR steel kav feem ntau xa hauv cov xwm txheej hauv qab no:
Kub Rolled: Cov phaj hlau ncaj qha txias tom qab siab -kub dov, ua rau cov nplai oxide tsawg dua thiab qhov tseeb dua qhov tseeb.
Tswj Rolling: Kub thiab deformation yog nruj me ntsis tswj thaum lub sij hawm dov kom tau ib tug zoo grain qauv, txhim kho cov hlau lub zog thiab toughness.
Normalizing: Cov phaj hlau yog rhuab mus rau qhov kub thiab txias thiab tom qab ntawd cua-cooled los txhim kho nws cov khoom siv kho tshuab thiab kev ua haujlwm thiab ua kom zoo sib xws. Qee cov hlau phaj tuaj yeem ua kom zoo ntxiv los ntawm kev kho kom zoo (S275JR + N).
Tsis tas li ntawd, cov hlau phaj tuaj yeem ua tiav raws li cov neeg siv khoom xav tau raws li hauv qab no:
Txiav: Lawv tuaj yeem txiav rau hauv ntau daim duab thiab qhov ntau thiab tsawg raws li cov duab kos, xws li laser txiav, plasma txiav, thiab nplaim txiav, kom ua tau raws li cov duab sib txawv thiab cov kev xav tau loj.
Flaw Detection: Muaj ntau theem ntawm kev kuaj xyuas qhov tsis zoo (piv txwv li, 1/2/3 xeem) los xyuas kom meej qhov zoo ntawm cov kav hlau.
Z-kev taw qhia Cov Khoom: Z- kev taw qhia cov khoom yuav tsum tau ntxiv (piv txwv li, Z15/Z25/Z35), haum rau tuab- kev taw qhia cov khoom hnyav, txhim kho cov hlau tsis kam rau lamellar tearing.
Cov yam ntxwv tseem ceeb
Lub zog siab: Lub zog tawm los ntawm S275JR steel ntau dua li cov pa roj carbon zoo tib yam, ua tau raws li qhov yuav tsum tau muaj ntawm ntau yam hnyav -load thiab siab - lub zog ua haujlwm ib puag ncig.
Zoo Weldability: Thaum lub sij hawm vuam, S275JR steel ua tau zoo - vuam zoo, tsis tshua muaj kev tawg thiab lwm yam tsis xws luag, ua kom muaj kev ruaj ntseg thiab kev nyab xeeb ntawm cov qauv welded.
Zoo Plasticity thiab Toughness
Cov phaj hlau no muaj cov yas zoo thiab cov tawv tawv, ua kom muaj peev xwm deformation zoo nyob rau hauv kev cuam tshuam thiab txo qhov kev pheej hmoo ntawm pob txha.
Corrosion Resistance
Los ntawm qhov tsim nyog cov ntsiab lus sib piv thiab cov txheej txheem kev kho cua sov, S275JR steel nthuav tawm qee qhov kev tiv thaiv corrosion, tiv taus qee yam tshuaj thiab electrochemical corrosion.
Cov cheeb tsam thov
Vim nws txoj kev ua tau zoo heev, S275JR steel kav tau siv dav hauv cov haujlwm hauv qab no:
Lub tsev tsim
Siv rau kev tsim cov khoom siv hlau rau siab- cov tsev nce siab, cov nroj tsuag loj, thiab lwm yam qauv.
S275JR steel kav muab kev thauj khoom txaus-cov kabmob muaj peev xwm thiab kev ua haujlwm seismic, ua kom muaj kev ruaj ntseg thiab kev nyab xeeb ntawm lub tsev.
Bridge Engineering
Siv rau kev tsim cov khoom siv hlau rau cov txuas hniav, xws li choj decks thiab cov qauv kev txhawb nqa.
Nws cov cuab yeej zoo heev thiab kev sib txuas ua kom muaj S275JR steel daim hlau kom ua tau raws li cov khoom thauj -cov kabmob muaj peev xwm thiab cov kav ntev ntawm cov choj.
Shipbuilding
Siv rau kev tsim cov hull thiab lawj cov qauv rau nkoj, xws li hulls thiab lawj kab teeb.
S275JR steel kav muaj qhov zoo heev corrosion kuj thiab weldability, ua tau raws li cov kav ntev thiab kev nyab xeeb ntawm cov nkoj.
Mechanical Manufacturing: Siv rau hauv kev tsim khoom ntawm ntau yam khoom siv tshuab, bearings, kis tau tus mob, thiab lwm yam.
Nws zoo plasticity thiab toughness xyuas kom meej tias cov khoom siv kho tshuab ua haujlwm ruaj khov nyob rau hauv cov khoom hnyav.
Pressure Vessels: Siv nyob rau hauv kev tsim cov hlab ntsha xws li liquefied roj av cia tanks.
Kev tiv thaiv corrosion zoo heev ntawm S275JR cov kav dej ua kom ntseeg tau tias cov khoom siv yuav tsis xau lossis ua rau muaj kev nyab xeeb thaum siv sijhawm ntev -.
Kev Lag Luam Hluav Taws Xob: Hauv kev lag luam roj thiab roj hluav taws xob, S275JR cov kav dej square feem ntau yog siv rau hauv kev tsim cov roj kav dej, lub tank cia, thiab lwm yam khoom siv.
S275JR Hollow Section Hoobkas
