Txhua tus neeg nrhiav cov qauv hlau rau kev ua haujlwm txawv teb chaws tau khiav mus rau tsev neeg no:S355 JR, S355J0, S355J2. Vim tias tag nrho peb qhov sib koom ua ke "S355" ua ntej, ob qho tib si sib txawv tab sis qhov kev xav tsis raug zoo sib xws. Ib qho yog tias lub ntsiab lus yog tshuaj pleev ib ce thiab ib qho ntawm peb tuaj yeem hloov pauv dawb. Lwm qhov yog tias J2 tsuas yog "tus qauv zoo dua," yog li qhia nws txhua qhov chaw tshem tawm txhua qhov kev pheej hmoo ntawm qib tsis raug. Tsis txhob tuav ib zaug koj saib dab tsi lub ntsiab lus tau lees paub.
Ib daim ntawv me me tab sis tseem ceeb ua ntej mus ntxiv: qhov raug xaiv yogS355J0, nrog tus lej xoom ua tus cim kawg - tsis yog tsab ntawv "O." Nws yog ib qho kev nthuav dav uas tau ntaus ntawv tsis raug feem ntau txaus ntawm kev xaj xaj thiab khw kos duab uas nws tsim nyog chij ntawm nws tus kheej.
Dab tsi JR, J0, thiab J2 Suffixes Tiag Tiag
Raws li European cov txheej txheem steel, ib qho kev xaiv S355 tawg ua peb yam.Sqhia txog cov qauv hlau.355yog qhov tsawg kawg nkaus yield zog, nyob rau hauv MPa, guaranteed nyob rau hauv ib tug tshwj xeeb thickness ntau yam. Lub ntsiab lus - JR, J0, los yog J2 - yog qhov peb qib sib txawv, thiab nws tsis muaj dab tsi ua rau lub zog. Nws qhia txog qhovcuam tshuam toughness chav kawm: qhov tsawg kawg nkaus lub zog cov khoom yuav tsum tau nqus nyob rau hauv Charpy V-notch test, txheeb xyuas ntawm qhov ntsuas kub.
| Qib | Tsawg kawg absorbed zog | Ntsuas kub |
|---|---|---|
| S355 JR | 27 J | +20 degree |
| S355J0 | 27 J | 0 degree |
| S355J2 | 27 J | -20 degree |
Nyeem meej: JR lees paub qhov muaj zog txaus ntawm chav sov, J0 lees tias nws tseem tuav ntawm 0 degree, thiab J2 lees tias nws tseem tuav ntawm -20℃. Nyob rau hauv cov nqe lus ntawm guaranteed qis-kub kev ua tau zoo, qhov qeb duas khiav J2 saum J0 saum JR. Tab sis qhov qeb duas no tshwj xeeb txog kev txheeb xyuas qhov hnyav ntawm qhov txias dua - nws tsis tau txhais hais tias txhua qhov project xav tau J2, thiab nws tsis tau txhais hais tias J2 tuaj yeem hloov pauv rau qib JR lossis J0 uas tsis muaj tus engineer sau kos npe tawm, txawm tias nws zoo li kev hloov kho ntawm daim ntawv.
Tib Yield Strength, Cov cwj pwm tsis zoo sib txawv
Raws li kev thauj khoom ib txwm muaj, cov qauv hlau yuav tsum tau tawm los thiab deform pom kev ua ntej nws ua tsis tiav - qhov kev coj tus cwj pwm yog qhov feem ntau ntawm cov qauv tsim xav tau thiab tso siab rau. Tab sis nyob rau hauv tej yam kev mob - tsis kub, tuab seem, vuam tsis xws luag, kev nyuaj siab concentrations, thiab dynamic los yog cuam tshuam loading - steel yuav es tsis txhob los ntawmbrittle puas, hom tsis ua hauj lwm nrog ib qho kev kos npe sib txawv: me me los yog tsis pom qhov deformation ua ntej, qhov pib tshwm sim sai sai, kev nthuav tawm sai sai thaum pib, thiab - thuam - ib qho kev ntxhov siab uas tseem yuav qis dua cov khoom siv zog thaum nws tshwm sim. Qhov no yog qhov tseeb vim li cas cov pob txha tawg yog qhov txaus ntshai: cov lus ceeb toom ib txwm muaj ntawm kev ua tsis tiav yuav tsis tshwm sim.
Charpy V-ntaus ntawv xeem muaj los tshuaj xyuas qhov kev pheej hmoo no. Ib qho piv txwv tsis sib haum yog ntaus thiab tawg ntawm qhov ntsuas kub, thiab lub zog ntawm cov khoom siv absorbs thaum lub pob tawg yog ntsuas. Dab tsi cais S355J2 los ntawm S355JR tsis yog siab dua load-cov kabmob muaj peev xwm - nws yog cov ntaub ntawv pov thawj tias cov hlau tseem nqus tau lub zog txaus, thiab yog li ntawd tseem tiv taus tawg tawg, ntawm qhov kub thiab txias 40℃txias dua li JR tau txheeb xyuas.
(Raws li pom nyob rau hauv qhov cuam tshuam -zog-vim- daim ntawv ntsuas kub saum toj no, txhua qib qhov nkhaus zaum ze li 20℃rau sab laug ntawm ib qho dhau los - tib yam khoom siv hauv qab tus cwj pwm, txheeb xyuas ntawm cov ntsiab lus txias dua hla dhau.)
Puas yog S355J2 Ib txwm "muaj zog" dua li S355JR?
Cov lus teb ncaj ncees nyob ntawm qhov khoom koj nug txog.
Nyob rau yield zog, tag nrho peb qib zaum nyob rau hauv tib tsev neeg S355 thiab, nyob rau hauv ib tug muab hom khoom thiab thickness ntau, nqa tseem ceeb tib yam tsawg kawg nkaus yield zog. Tab sis muaj cov ncauj lus kom ntxaws buyers nquag nco tsis hais cov lus dab tsi lawv tau xaj:S355 tsis yog lub tiaj tus 355 MPa hla txhua qhov tuab.Qhov guaranteed yam tsawg kawg nkaus lub zog txo qis raws li phaj thickness nce nyob rau hauv tus txheej txheem tswj cov khoom. Qhov no tseem ceeb tshaj plaws rau cov phaj hnyav hnyav, cov phaj tuab tuab, thiab dov cov ntu hnyav - qhov tseeb tuab ntawm tes yuav tsum tau kuaj xyuas tus qauv lub rooj, tsis suav tias yog "355" hauv lub npe.
Ntawm qis-kub toughness, J2 tiag tiag ua tau zoo tshaj JR - nws tau txheeb xyuas qhov txias dua, thiab feem ntau yog qhov kev xaiv tsim nyog rau huab cua txias, ntu tuab, thiab xav tau kev sib txuas welded. Tab sis S355J2 tsuas yog lees paub qhov ua tau zoo mus rau -20℃raws li qhov kev xeem teev tseg. Nws tsis yog daim pam lav rau txhua qhov kub hauv qab no, thiab kho qhov ntsuas -20℃raws li nws npog -35℃kev pabcuam yog nws qhov kev siv tsis raug.
Xaiv Cov Qib Zoo rau Kev Ua Haujlwm txawv teb chaws
Kev xaiv yuav tsum ua raws li cov kev pabcuam tiag tiag, tsis yog ib qho kev hloov pauv xws li "nws txias npaum li cas."
Rauruaj khov nyob hauv ib puag ncignrog lub teeb, yooj yim thauj cov tswv cuab thiab cov ntu nyias, qee qhov kev qhia tshwj xeeb tso cai rau S355JR. Raucov qauv sab nraum zoov, qhov kev xaiv ntawm J0 thiab J2 feem ntau ua raws li qhov chaw tsim qhov kub thiab txias ua ke nrog cov ntsiab lus sib txuas. Rautxias tiag tiag - tej yaam num huab cua, J2 feem ntau yog qhov pib taw tes - thaum khaws cia hauv siab nws -20℃txwv yog ib thaj tsam uas tau hais tseg, tsis yog qhib - xaus rau huab cua txias.
Qhov twg nws tau txais ntau nuanced yogcov phaj tuab thiab cov kev sib txuas tseem ceeb. Txawm tias nyob rau hauv ib qhov project nyob rau hauv ib tug sov so, yam xws li hnyav seem thickness, nro cov tswv cuab, hnyav loaded crane girders, ntev -span trusses, heev welded pob qij txha, thiab qaug zog los yog dynamic loading muaj peev xwm txhua tus ntawm nws tus kheej ua pov thawj rau ib tug ntau dua toughness chav kawm ntawv - tsis hais seb lub regional huab cua yog me ntsis. "Nws kub ntawm no, yog li JR txhua qhov chaw zoo" yog raws nraim li qhov tsis txaus ntseeg raws li "ib txwm qhia J2 kom nyab xeeb."
(Daim ntawv qhia kev txiav txim siab saum toj no qhia txog qhov no: kev nyab xeeb-raws li ceg ntoo yog qhov pib, tab sis cov xwm txheej override nyob rau hauv qab siv tsis hais lub ceg twg yuav pib rau.)
Qhov Chaw Muag Khoom thiab Kev Ntsuam Xyuas Kev Tsim Kho feem ntau mus yuam kev
Nyeem tsuas yog "S355" thiab hla lub ntsiab lus.JR, J0, thiab J2 zaum ntawm cov qib sib xws tab sis sawv cev qhov sib txawv ntawm qhov ntsuas ntsuas ntsuas kub - kho lawv raws li kev hloov pauv tau vim tias tus lej sib tw yog ib qho kev nyeem tsis raug ntawm tsev neeg no.
Paub meej tias qib tab sis tsis yog phaj thickness.Lub phaj nyias ua kom txaus siab rau qhov yuav tsum tau muaj zog tawm los tsis lav lub phaj tuab ntawm tib qib txaus siab rau tib tus lej - cov ntu tuab nqa qis qis qis qis qis qis qis qis qis raws li tus qauv tswj hwm, thiab qhov no yuav tsum tau kuaj xyuas qhov tseeb thickness txiav txim, tsis yog los ntawm qib nominal.
Overlooking kev xa khoom.Cov xwm txheej xa khoom muaj xws li+ AR(raws li -rolled),+N(normalized lossis normalized-rolled), thiab+M(thermomechanically dov). Tib qib muab los ntawm cov khoom xa tuaj sib txawv tuaj yeem coj tus cwj pwm sib txawv hauv vuam thiab tawv - qhov no yog qhov sib txawv ntawm JR / J0 / J2 thiab xav tau nws tus kheej kev pom zoo ntawm qhov kev txiav txim.
Kho qhov ntsuas ntsuas ntsuas raws li kev hloov kho uas tau lees paub.Yog tias ib qho tshwj xeeb ntawm S355JR tshwm sim los ntsuas qhov zoo ntawm -20 degree, qhov tshwm sim ib zaug tsis ua rau nws S355J2. Tus kws tshuaj xyuas txawv teb chaws lossis tus thib peb- tus kws tshuaj ntsuam xyuas yog tshuaj xyuas tus txheej txheem tswj hwm, cov kev xeem uas tsim nyog, thiab tag nrho cov ntaub ntawv traceability - tsis yog ib tus lej zoo rub tawm ntawm lub zeb cov ntaub ntawv sab hauv.
Piv txwv tias qib siab dua tuaj yeem hloov pauv dawb.Txawm tias J2 tiag tiag muaj qhov zoo dua qis - qhov kub thiab txias ua tau zoo dua li qhov tau teev tseg, hloov nws yam tsis muaj tus kws ua haujlwm lossis tus neeg siv cov ntawv pom zoo dhau los ntawm tus qauv tsim thiab kev saib xyuas cov txheej txheem ntawm qhov project tiag tiag.
Yuav ua li cas kom paub meej ntawm Mill Test Certificate
Vim lub ntsiab lus yog tag nrho cov ntsiab lus ntawm tsev neeg no, daim ntawv pov thawj zeb xeem yuav tsum tau sau nws - tsis yog hais txog qib uas qhia nws. Daim ntawv pov thawj siv tau rau kev pom zoo ua haujlwm txawv teb chaws yuav tsum qhia: cov khoom lag luam tshwj xeeb thiab cov khoom siv tau raug sim; qhov kev xa khoom tiag tiag (+ AR, + N, lossis + M) es tsis tso nws tseg lossis xav tias; lub thickness -cov txiaj ntsig tshwj xeeb thiab cov txiaj ntsig tensile khi rau lub phaj tiag lossis ntu tuab muab, tsis yog tus nqi generic qib; thiab Charpy V-notch cov txiaj ntsig tau tshaj tawm ntawm qhov ntsuas qhov ntsuas qhov tsim nyog rau cov lus txiav txim, nrog rau qhov tseeb absorbed zog tus nqi qhia es tsis yog ib qho yooj yim pass/fail note. Thaum tshav kub kub traceability rov qab mus rau qhov tshwj xeeb daim ntawv pov thawj tseem ceeb ib yam nkaus, tshwj xeeb tshaj yog nyob rau hauv tej yaam num uas ib tug thib peb - tog neeg soj ntsuam yuav hla - xyuas cov ntaub ntawv tiv thaiv lub cev cim rau ntawm lub phaj xa. Daim ntawv pov thawj uas hais tias "S355J2" yam tsis tau qhia txog -20℃kev xeem tau thiab lub zog tiag tiag absorbed tsis sib npaug, los ntawm kev tshuaj xyuas, mus rau ib qho uas qhia tag nrho cov ntaub ntawv - txawm tias cov khoom nws tus kheej yog tiag tiag ua raws.
Txoj Kev Siv Tau
Qhov sib txawv tiag tiag ntawm S355JR, S355J0, thiab S355J2 nqes mus rau ib kab lus: dav dav zoo li lub zog tawm los, tab sis qhov sib txawv ntawm qhov ntsuas kub uas cov khoom siv tiv thaiv kev tawg tawg tau raug txheeb xyuas. JR haum rau qhov mob me me, xav tau tsawg dua; J0 lees paub kev ua haujlwm qis rau 0 degree; J2 lees paub nws mus rau -20℃- thiab tsis muaj qhov hloov pauv vim hais tias ib lub tebchaws muaj huab cua kub nyob nruab nrab.
Xaiv cov qib zoo rau kev ua haujlwm txawv teb chaws txhais tau hais tias qhov ntsuas qhov ntsuas qhov tsawg kawg nkaus ua ke nrog cov phaj tuab, lub xeev kev ntxhov siab, kev sib txuas thiab vuam cov ntsiab lus, thiab seb qhov chaw thau khoom tsis muaj zog lossis qaug zog yog tam sim no - tsis yog qhov ua rau qib twg zoo tshaj plaws. Kev xaiv cov khoom siv tiag tiag tsis yog hais txog kev qhia meej txog cov chav kawm siab tshaj plaws; nws yog hais txog kev nrhiav cov qib uas txaus siab rau kev nyab xeeb thiab kev pom zoo uas yuav tsum tau ua thaum khaws cov khoom thiab cov nqi hauv qhov laj thawj.
