Dab tsi yog qhov ntom ntawm S355JR Cov Khoom Siv Hluav Taws Xob?
Qhov ntom ntawm S355JR cov khoom siv raj yog kwv yees li 7.85 g / cm3 (7850 kg / m3). Qhov no yog tus qauv ntom ntom ntawm cov qauv carbon steel thiab tsis hloov ntawm cov qib: S235JR, S275JR thiab S355JR tag nrho cov nqi sib npaug vim qhov ntom ntom yog qhov ua haujlwm ntawm cov hlau -raws li cov qauv siv lead ua, tsis yog cov hlau me me ntxiv uas txawv cov qib. Qhov ua tau zoo yog tias qhov hnyav ntawm qhov muab S355JR ntu tuaj yeem suav nrog tib qhov tsis tu ncua siv rau lwm tus tswv cuab carbon steel.
S355JR nws tus kheej yog cov qauv hlau uas tau teev tseg hauv EN 10025-2, nrog qhov tsawg kawg nkaus tawm lub zog ntawm 355 MPa thiab qhov cuam tshuam tsawg kawg nkaus ntawm 27 J ntawm 20 deg C. Thaum ua raws li square hollow seem (SHS) raj, cov khoom ua raws li EN 10210-1 (kub tiav) lossis EN 10d form (EN 10c).
Cov khoom tseem ceeb ntawm lub cev
| Khoom | Yam nqi |
|---|---|
| Qhov ntom | 7.85 g / cm3 (7850 kg / m3) |
| Coefficient ntawm thermal expansion | 12 x 10-6 ° C (12 micrometers ib 'meter' ib degree) |
| Thermal conductivity ntawm chav tsev kub | Kwv yees li 50 W / (mK) |
| Modulus ntawm elasticity | Kwv yees li 210 GPa |
Cov txiaj ntsig no txhais tau hais tias tus qauv ua los ntawm S355JR nthuav dav thiab sib cog lus kwv yees nrog qhov kub thiab txias, ua kom muaj cua sov zoo, thiab khaws nws qhov ntev kom ruaj khov nyob rau hauv ib txwm tsim ntau yam. Lub modulus ntawm elasticity yog siv nyob rau hauv tag nrho cov deflection thiab stability xam; Nco ntsoov tias nws yog qhov tseem ceeb tib yam rau tag nrho cov qauv carbon steels, yog li xaiv S355JR nce lub zog tab sis tsis nruj piv nrog S235JR.
Kev tsim khoom
S355JR square tube yog tsim los ntawm kub -rolled strip. Lub sawb yog hlais mus rau qhov xav tau dav thiab txias- ua los ntawm yob- ua haujlwm rau hauv ib qho square cross-section, ces lub seam raug kaw los ntawm siab - zaus hluav taws xob- tsis kam vuam, uas fuses cov npoo yam tsis muaj cov hlau muab tub lim. Sab hauv thiab sab nrauv weld hlaws yog trimmed kom lub bore yog du thiab sab nrauv yog tiaj tus. Tom qab ntawd lub raj yog qhov loj me thiab ncaj nraim kom coj cov qhov ntev ntawm sab, squareness thiab ncaj nraim nyob rau hauv chav kawm kam rau ua ntawm EN 10219-1, txiav kom ntev, thiab muab cov kev kho saum npoo. Txhua theem yog parameter-tswj: vuam tam sim no thiab ceev txiav seam zoo, thiab sizing yob txiav txim qhov kawg geometry.
Specifications thiab Loj
S355JR square raj feem ntau muaj nyob rau sab ntev ntawm 20 hli mus rau 400 hli thiab phab ntsa thicknesses los ntawm 1.5 hli mus rau 16 hli, nrog rau kev sib xyaw ua ke txwv los ntawm kev tsim lub peev xwm ntawm lub zeb thiab cov kev cai tsim ntawm seem. Qhov tso cai sib txawv nyob rau sab ntev, phab ntsa thickness thiab ncaj nraim ua raws li EN 10219-1 lossis qhov project specification, thiab lub kaum sab xis ntawm lub vojvoog yog txhais raws li kev ua haujlwm ntawm phab ntsa tuab. Qhov ntau thiab tsawg tshwj xeeb tuaj yeem dov los txiav txim thaum tus txheej txheem ntau yam tsis npog qhov yuav tsum tau ua.
Yuav ua li cas xam qhov Theoretical Luj
Lub theoretical hnyav ib 'meter' square raj yuav xam los ntawm tus ntoo khaub lig-section: W=(4a - 4t) xtx 0.00785, qhov twg a yog qhov ntev nyob rau hauv millimeters, t yog phab ntsa thickness nyob rau hauv millimeters, thiab W yog qhov hnyav nyob rau hauv kilograms ib 'meter'. Rau ib lub raj square nrog ib sab ntev ntawm 100 hli thiab phab ntsa tuab ntawm 5 hli, qhov kev suav muab (400 - 20) x 5 x 0.00785=14.9 kg / m. Qhov tseeb qhov hnyav sib txawv me ntsis nrog rau kev tsim khoom, lub kaum sab xis thiab qhov ceev ntawm lub tshav kub, yog li tus nqi theoretical yog siv rau kev kwv yees, kev txiav txim thiab kev xa khoom, tsis yog rau kev sib hais haum.
Cov yam ntxwv ua haujlwm
Cov seem square muaj qhov sib npaug ntawm lub sijhawm ntawm inertia nyob rau hauv ob lub hauv paus axes, muab kev khoov tsis sib xws hauv txhua qhov kev taw qhia thiab tus cwj pwm zoo torsional piv nrog qhib profiles ntawm tib qhov hnyav. Lub zog siab -rau- qhov hnyav piv ntawm S355JR txo qhov loj ntawm cov qauv, thiab lub ntsej muag tiaj tus yooj yim bolted, welded thiab splice kev sib txuas. Qhov saum npoo du txais cov xim, hmoov txheej thiab galvanizing tau yooj yim. Hauv kev tsim khoom, lub raj tuaj yeem raug txiav, drilled, khoov thiab welded nrog cov qauv siv; welded pob qij txha txhim kho lub zog piv rau cov khoom siv hauv paus, thiab kev siv vuam ib txwm tsis ua rau cov khoom siv ntawm lub raj.
Daim ntawv thov
Kev tsim kho: Hoobkas trusses, chaw ntau pob chaw thav duab, kab hlau rhuav -phab ntsa kev txhawb nqa tshuab thiab txhua kab, qhov twg cov ntu ua kom yooj yim ntawm cov qauv tsim thiab qhov hollow profile txo qhov hnyav. Machinery manufacturing: khoom thav duab, conveyor rails thiab automation kev txhawb nqa, qhov twg qhov tseeb ntawm qhov sib dhos kom muaj tseeb. Tsheb thauj mus los: tsheb lub cev thav duab, thawv ntim khoom thiab cov khoom siv trailer, qhov chaw txhim khu kev qha thiab qhov hnyav nruab nrab txhim kho kev ua haujlwm ntawm kev thauj khoom. Lub zog thiab kev tsim kho vaj tsev: hnub ci- vaj huam sib luag txhawb nqa cov qauv, kos npe gantry thiab nkag mus rau cov platforms uas tau txais txiaj ntsig los ntawm cov qauv txheej txheem cov khoom thiab yooj yim galvanizing.
Cov lus nug nquag
Dab tsi yog qhov ceev ntawm S355JR steel?
Kwv yees li 7.85 g / cm3 (7850 kg / m3), tus qauv ntom ntom ntawm cov qauv carbon steel. Nws yog tib yam rau S235JR, S275JR thiab S355JR thiab yog siv nyob rau hauv tag nrho cov luj thiab shipping xam.
Kuv yuav xam qhov hnyav ntawm S355JR square raj li cas?
Siv W=(4a - 4t) xtx 0.00785 rau lub raj square, nrog rau ib thiab t hauv millimeters, muab kilos ib 'meter'. Rau 100 mm x 5 mm tub no yog hais txog 14.9 kg / m. Rau lub raj raj siv W=(2a + 2b - 4t) xtx 0.00785.
Puas yog S355JR hnyav dua S235JR?
Tsis yog. Ob qib muaj qhov sib npaug ntawm 7.85 g / cm3. S355JR muaj zog dua (yield ntau dua thiab tensile lub zog), yog li rau tib lub thauj khoom tus tsim qauv feem ntau siv cov seem sib dua, tab sis qhov ceev nws tus kheej yog tib yam.
Dab tsi yog qhov siab tshaj plaws ntawm S355JR square raj?
Cov khoom siv feem ntau npog sab ntev li ntawm 20 hli mus rau 400 hli nrog phab ntsa tuab ntawm 1.5 hli txog 16 hli. Loj dua lossis tsis yog- qhov loj me tuaj yeem tsim los txiav txim, txwv los ntawm lub tshuab tsim lub peev xwm thiab cov qauv siv tau.
S355JR square raj puas tuaj yeem welded tom qab galvanizing?
Vuam tom qab galvanizing yuav tsum tau zam, vim hais tias cov zinc txheej ua fumes thiab embrits lub weld. Qhov ib txwm ua ntu zus yog tsim thiab vuam ua ntej, tom qab ntawd galvanize lub rooj sib dhos tiav. Yog tias qhov vuam tsis tuaj yeem zam tom qab galvanizing, cov txheej yuav tsum tau muab tshem tawm hauv zos thiab kho tom qab ntawd.
Puas yog qhov ceev hloov nrog qhov kub thiab txias?
Yog, me ntsis. Hlau nthuav dav thaum rhuab, yog li qhov ceev yuav txo qis nrog qhov kub thiab txias, tab sis rau kev tsim qauv chav tsev - tus nqi kub ntawm 7.85 g / cm3 yog siv thoob plaws. Thermal expansion yog tswj nyias los ntawm cov coefficient ntawm thermal expansion hauv kev tsim cov kab ntev thiab cov thav duab loj.