ASTM A252, ASTM A252steel yeeb nkab yog ib hom cylindrical yeeb nkab pawg cov ntaub ntawv uas npog ob qho tib si welded thiab seamless hom rau steel yeeb nkab piles qhov twg steel cylinder yog siv raws li ib tug mus tas li load-nqa cov tswv cuab los yog raws li lub plhaub los tsim ib tug cam khwb cia-nyob rau hauv-qhov chaw pob zeb pawg.
Qib 3yog qib kev ua tau zoo tshaj plaws ntawm peb qib A252, nrog qhov tsawg kawg nkausyield zog ntawm 310MPa [45,000 psi]thiab yam tsawg kawg nkaustensile zog ntawm 455MPa [66,000 psi].Piv nrog rau lwm cov qib, Qib 3 yog qhov tsim nyog rau cov qauv uas muaj cov khoom hnyav lossis nyob rau hauv qhov chaw xav tau ntau dua, thiab feem ntau yog siv rau hauv kev tsim cov hauv paus rau cov choj loj, cov tsev siab siab, lossis cov chaw sab nrauv.
A252 tau muab faib ua peb qib los tiv thaiv qhov chaw siv sib txawv.
Qib 1,Qib 2, thiabQib 3.
Maj mam nce hauv cov khoom siv kho tshuab.
Qib 1Feem ntau yog siv rau hauv cov ntawv thov uas cov av zoo yog qhov zoo thiab cov kev xav tau ntawm kev thauj khoom tsis yog siab tshwj xeeb.Piv txwv muaj xws li cov qauv tsim lub hauv paus rau cov tsev nyob lossis cov tsev lag luam, lossis cov choj me me uas tsis tas yuav muaj cov khoom hnyav.
Qib 2yog haum rau daim ntaub ntawv nrog cov av tsis zoo los yog siab load-bearing yuav tsum tau.Piv txwv li, cov choj thauj khoom nruab nrab, cov tsev lag luam loj, lossis cov chaw tsim kho vaj tse ntawm pej xeem.Nws tseem tuaj yeem siv rau hauv thaj chaw uas muaj cov rooj dej siab, xws li cov dej ntws thiab cov pas dej, qhov twg yuav tsum muaj zog deformation.
Qib 3yog siv rau kev ua haujlwm hnyav hauv cov xwm txheej hnyav, xws li cov txuas hniav loj, cov cuab yeej siv hnyav, lossis kev sib sib zog nqus ua haujlwm rau cov tsev siab.Tsis tas li ntawd, rau qhov tshwj xeeb geological tej yam kev mob, xws li cov av mos heev los yog tsis ruaj tsis khov, Qib 3 muaj lub siab tshaj plaws load-nqa peev thiab stability.
Tsim los ntawm 2014,Botop Steelyog ib tug ua carbon steel yeeb nkab tsum nyob rau hauv sab qaum teb Tuam Tshoj, lub npe hu rau ua zoo welded thiab seamless steel kav.
Tag nrho peb cov khoom ua tau raws li cov qauv nruj ASTM A252, kom ntseeg tau tias kev ua haujlwm zoo nyob rau hauv cov xwm txheej hnyav.
Peb kuj muab ntau yam fittings thiab flanges kom tau raws li qhov xav tau ntawm ntau yam ntawm cov kav dej.
Thaum koj xaiv Botop Steel, koj xaiv qhov zoo tshaj plaws thiab kev ntseeg tau.
ASTM A252 Yeeb Nkab Pipes tuaj yeem muab faib ua ob txoj haujlwm tseem ceeb:seamless thiab welded.
Nyob rau hauv txoj kev welding, nws tuaj yeem muab faib ntxiv rau hauvERW, EFW, thiabSAW.
SAW tuaj yeem categorized rau hauvLSAW(SAWL) andSSAW(HSAW) nyob ntawm qhov kev taw qhia ntawm qhov vuam.
Vim tias SAW feem ntau yog welded siv ob sab submerged arc vuam txheej txheem, lawv kuj tseem hu uaDSAW.
Cov kev tsim ntau yam no tso cai rau ASTM A252 tubular pawg yeeb nkab kom tau raws li ntau yam kev xav tau ntawm engineering.
Cov hauv qab no yog daim ntawv qhia ntau lawm ntawm kauv steel yeeb nkab (SSAW):
SSAW steel yeeb nkabyog qhov zoo tagnrho rau kev tsim cov yeeb nkab loj-ntev thiab tuaj yeem ua rau hauv txoj kab uas hla mus txog 3,500mm.Tsis tsuas yog nws tuaj yeem tsim tau ntev ntev, zoo tagnrho rau cov qauv loj, tab sis SSAW steel yeeb nkab kuj pheej yig dua piv rau LSAW thiab SMLS steel yeeb nkab.
Botop Steel tuaj yeem muab cov kab hauv qab no me me ntawm cov raj steel:
Cov ntsiab lus phosphorus tsis tshaj 0.050%.
Cov tshuaj muaj pes tsawg leeg uas yuav tsum tau muaj rau ASTM A252 yog qhov yooj yim piv rau lwm cov yeeb nkab qauv rau lwm yam kev siv vim hais tias thaum cov yeeb nkab siv los ua cov yeeb nkab pawg, nws yog feem ntau structural nyob rau hauv cov xwm.Nws yog txaus tias cov yeeb nkab steel tuaj yeem tiv taus qhov yuav tsum tau ua thiab ib puag ncig.Qhov yooj yim chemistry no yuav pab txhim kho tus nqi thiab kev tsim khoom zoo thaum ua tau raws li cov kev xav tau ntawm cov qauv kev nyab xeeb thiab kav ntev.
ATable 2 muab cov txiaj ntsig yam tsawg kawg nkaus suav nrog:
Qhov twg qhov teev nominal phab ntsa thickness yog nruab nrab rau cov uas qhia saum toj no, qhov tsawg kawg nkaus elongation tus nqi yuav tsum tau txiav txim raws li nram no:
Qib 3: E = 32t + 10.00 [E = 1.25t + 10.00]
E: elongation hauv 2 nti [50.8 mm], %;
t: teev nominal phab ntsa thickness, nyob rau hauv. [mm].
Rau cov yeeb nkab pawg qhov ntau thiab tsawg uas tsis tau teev nyob rau hauv daim ntawv qhia qhov hnyav, qhov hnyav ntawm ib chav tsev ntev yuav tsum tau xam raws li hauv qab no:
W = 10.69(D - t)t [ W = 0.0246615(D - t)t ]
W = nyhav ib chav tsev ntev, lb/ft [kg/m].
D = teev sab nraud txoj kab uas hla, hauv. [mm],
t = teev nominal phab ntsa thickness, in. [mm].
Peb lub tuam txhab muaj ntau yam txheej txheej xws li Xim, kua roj vanish, galvanized, zinc-nplua nuj epoxy, 3LPE, thee tar epoxy, thiab lwm yam.
Thaum muas A252 Pipe Pile Tubing, cov ntaub ntawv hauv qab no yuav tsum tau muab los pab txhawb tus neeg muag khoom lub peev xwm kom ua tau raws li koj cov kev xav tau tshwj xeeb thiab txo qis kev hloov kho tom ntej thiab muaj peev xwm qeeb.
1 Quantity (ko taw lossis tus naj npawb ntawm qhov ntev),
2 Lub npe ntawm cov khoom siv (cov yeeb nkab steel),
3 Txoj kev tsim khoom (seamless lossis welded),
Qib 4 (1, 2, lossis 3),
5 Loj (sab nraud txoj kab uas hla thiab nominal phab ntsa thickness),
6 Lengths (ib zaug random, ob chav random, los yog niaj hnub),
7 Thaum kawg,
8 ASTM specification tsim thiab xyoo ntawm qhov teeb meem.
