ASTM A252Cov yeeb nkab hlau yog cov khoom siv yeeb nkab cylindrical uas siv tau rau ob qho tib si welded thiab seamless rau cov yeeb nkab hlau qhov twg lub tog raj kheej hlau siv ua tus tswv cuab thauj khoom tas mus li lossis ua lub plhaub los ua lub hauv paus pob zeb uas tau pov rau hauv qhov chaw.
Qib 3yog qib kev ua tau zoo tshaj plaws ntawm peb qib ntawm A252, nrog rau yam tsawg kawg nkauslub zog tawm los ntawm 310MPa [45,000 psi]thiab tsawg kawg nkauslub zog tensile ntawm 455MPa [66,000 psi]Piv rau lwm cov qib, Qib 3 zoo dua rau cov qauv uas muaj cov khoom hnyav lossis nyob rau hauv cov chaw uas xav tau ntau dua, thiab feem ntau yog siv rau hauv kev tsim cov hauv paus rau cov choj loj, cov tsev siab, lossis cov chaw ua haujlwm hauv hiav txwv.
A252 muab faib ua peb qib kom daws tau cov kev siv sib txawv.
Qib 1,Qib 2, thiabQib 3.
Maj mam nce ntxiv hauv cov khoom siv kho tshuab.
Qib 1feem ntau yog siv rau hauv cov ntawv thov uas cov av zoo thiab qhov yuav tsum tau nqa khoom tsis siab heev. Piv txwv li suav nrog cov qauv tsim uas tsis hnyav rau cov tsev nyob lossis cov tsev lag luam, lossis cov choj me me uas tsis xav tau cov khoom hnyav.
Qib 2Nws yog qhov tsim nyog rau cov ntawv thov uas muaj cov av tsis zoo lossis cov kev xav tau siab. Piv txwv li, cov choj uas muaj qhov nruab nrab, cov tsev lag luam loj, lossis cov khoom siv ntawm cov chaw pej xeem. Nws kuj tseem siv tau rau hauv cov chaw uas muaj cov dej siab, xws li cov dej ntws thiab cov pas dej, qhov twg xav tau kev tiv thaiv kev hloov pauv zoo.
Qib 3siv rau cov kev xav tau hnyav hauv cov xwm txheej hnyav, xws li cov choj loj, cov khoom siv hnyav, lossis kev ua haujlwm tob rau cov tsev siab. Tsis tas li ntawd, rau cov xwm txheej geological tshwj xeeb, xws li cov av mos heev lossis tsis ruaj khov, Qib 3 muaj peev xwm nqa khoom siab tshaj plaws thiab ruaj khov.
Tsim muaj xyoo 2014,Botop Hlauyog ib lub tuam txhab ua yeeb nkab carbon steel hauv Northern China, paub txog kev tsim cov yeeb nkab steel zoo thiab seamless.
Tag nrho peb cov khoom ua tau raws li cov qauv ASTM A252 nruj heev, kom ntseeg tau tias muaj kev ua tau zoo tshaj plaws hauv qab qhov xwm txheej hnyav.
Peb kuj muab ntau yam khoom siv thiab flanges kom tau raws li qhov xav tau ntawm ntau yam haujlwm piping.
Thaum koj xaiv Botop Steel, koj xaiv qhov zoo tshaj plaws thiab kev ntseeg tau.
ASTM A252 Cov Yeeb Nkab Yeeb Nkab tuaj yeem muab faib ua ob txoj hauv kev tsim khoom tseem ceeb:seamless thiab welded.
Hauv cov txheej txheem welding, nws tuaj yeem muab faib ua ntau ntuERW, EFW, thiabSAW.
SAW tuaj yeem raug cais ua pawgLSAW(SAWL) thiabSSAW(HSAW) nyob ntawm seb qhov kev taw qhia ntawm qhov vuam.
Vim tias SAW feem ntau yog welded siv ob-sided submerged arc welding txheej txheem, lawv kuj feem ntau hu uaDSAW.
Cov txheej txheem tsim khoom ntau yam no tso cai rau ASTM A252 tubular pile yeeb nkab kom tau raws li ntau yam kev xav tau engineering.
Cov hauv qab no yog daim ntawv qhia txog kev tsim khoom ntawm cov yeeb nkab hlau kauv (SSAW):
SSAW yeeb nkab hlauzoo tagnrho rau kev tsim cov yeeb nkab hlau loj thiab tuaj yeem tsim tau txog li 3,500 hli. Tsis yog nws tuaj yeem tsim tau ntev heev xwb, zoo tagnrho rau cov qauv loj, tab sis SSAW yeeb nkab hlau kuj pheej yig dua piv rau LSAW thiab SMLS yeeb nkab hlau.
Botop Steel tuaj yeem muab cov raj hlau loj hauv qab no:
Cov ntsiab lus phosphorus yuav tsum tsis pub tshaj 0.050%.
Cov kev cai ntawm cov tshuaj lom neeg rau ASTM A252 yooj yim piv rau lwm cov qauv yeeb nkab rau lwm daim ntawv thov vim tias thaum cov yeeb nkab siv ua pawg yeeb nkab, nws yog cov qauv tseem ceeb. Nws txaus kom cov yeeb nkab hlau tuaj yeem tiv taus cov khoom thauj thiab cov xwm txheej ib puag ncig. Cov tshuaj lom neeg yooj yim no pab txhim kho tus nqi thiab kev tsim khoom thaum ua tau raws li cov kev xav tau yooj yim ntawm kev nyab xeeb thiab kev ruaj khov.
ARooj 2 muab cov nqi tsawg kawg nkaus uas tau suav:
Qhov twg qhov tuab ntawm phab ntsa uas teev tseg yog nruab nrab rau cov uas tau qhia saum toj no, tus nqi elongation tsawg kawg nkaus yuav tsum txiav txim siab raws li hauv qab no:
Qib 3: E = 32t + 10.00 [E = 1.25t + 10.00]
E: kev ntev hauv 2 nti. [50.8 hli], %;
t: teev tseg nominal phab ntsa thickness, nyob rau hauv. [mm].
Rau qhov loj ntawm cov yeeb nkab uas tsis tau teev nyob rau hauv daim ntawv qhia qhov hnyav ntawm cov yeeb nkab, qhov hnyav ib chav ntev yuav tsum tau xam raws li nram no:
W = 10.69(D - t)t [ W = 0.0246615(D - t)t]
W = qhov hnyav ib chav ntev, lb/ft [kg/m].
D = qhov ntsuas sab nraud uas tau teev tseg, hauv. [hli],
t = teev tseg nominal phab ntsa thickness, nyob rau hauv. [mm].
Peb lub tuam txhab muaj ntau yam xim pleev xim xws li Xim, varnish, galvanized, zinc-rich epoxy, 3LPE, thee tar epoxy, thiab lwm yam kom tau raws li qhov xav tau ntawm ntau yam haujlwm thiab xyuas kom ruaj khov mus sij hawm ntev.
Thaum yuav A252 Yeeb Nkab Pile Tubing, cov ntaub ntawv hauv qab no yuav tsum tau muab los pab txhawb tus neeg muag khoom lub peev xwm los ua kom tau raws li koj cov kev xav tau tshwj xeeb thiab txo qis kev hloov kho tom qab thiab kev ncua sijhawm.
1 Qhov ntau (taw lossis tus naj npawb ntawm qhov ntev),
2 Lub npe ntawm cov khoom siv (cov yeeb nkab hlau),
3 Txoj kev tsim khoom (seamless lossis welded),
Qib 4 (1, 2, lossis 3),
5 Qhov Loj (sab nraud txoj kab uas hla thiab nominal phab ntsa thickness),
6 Qhov Ntev (ib qho random, ob chav random, lossis sib xws),
7 Xaus tiav,
8 ASTM cov lus qhia tshwj xeeb thiab xyoo muab tawm.
