Inferior steel tubes yog folding.
Folding yog hais txog ntau yam creases tsim nyob rau saum npoo ntawm steel hlab, feem ntau khiav longitudinally los ntawm tag nrho cov khoom. Qhov kev tsis zoo no tshwm sim vim qhov ua tsis tau zoo ntawm cov tuam txhab lag luam nrhiav kev ua haujlwm siab, ua rau muaj kev txo qis ntau dhau uas tsim cov fins, uas tom qab quav thaum lub sij hawm dov tom ntej. Cov khoom khoov nrog folding zoo li tawg, txo cov hlau lub zog.
Qhov saum npoo ntawm cov hlau tsis zoo feem ntau pom muaj pitting.
Pitting yog ib qho tsis sib xws, tsis sib xws ntawm qhov chaw uas tshwm sim los ntawm kev hnav hnyav ntawm cov dov grooves. Inferior steel tube manufacturers feem ntau tshaj qhov dov groove tus qauv siv txwv kom ua kom tau nyiaj ntau tshaj.
Inferior steel hlab yog nquag ua caws pliav ntawm lawv qhov chaw.
Qhov no tuaj yeem raug ntaus nqi rau ob qho laj thawj: (1) Cov khoom siv tsis sib xws thiab cov ntsiab lus tsis huv siab hauv cov hlau tsis zoo. (2) Kev taw qhia yooj yim thiab tiv thaiv cov cuab yeej hauv cov chaw ua haujlwm tsis zoo, ua rau cov hlau nplaum thiab caws pliav tom qab impurities embed rau hauv cov menyuam.
Cov kab nrib pleb yooj yim tshwm rau saum npoo ntawm cov ntaub ntawv tsis zoo vim tias lawv cov pob zeb yog lub ntiaj teb, muaj ntau cov huab cua pores. Thaum lub sij hawm txias, cov pores no raug thermal stress, ua rau cov kab nrib pleb uas pheej los ntawm cov txheej txheem dov.
Inferior steel tubes muaj kev cuam tshuam rau khawb vim cov khoom siv rudimentary hauv cov chaw ua haujlwm tsis zoo, uas yooj yim tsim cov burrs uas khawb cov hlau nto. Sib sib zog nqus khawb txo cov hlau lub zog.
Inferior steel tubes tsis muaj xim hlau luster, tshwm pinkish los yog zoo li npua hlau. Qhov no yog vim ob yam: earthy billets thiab tsis raug dov kub. Txij li cov hlau kub yog qhov pom kev kwv yees, lawv tsis tuaj yeem tswj tau nyob rau hauv qhov teev austenitic ntau yam, ua rau subpar steel zog.
Inferior steel tubes muaj nyias thiab qis transverse tav, feem ntau tshwm underfilled. Qhov no yog vim hais tias manufacturers tsom rau loj tsis zoo tolerances, uas ua rau ntau heev txo nyob rau hauv lub pib dov theem, me me hlau tuag, thiab underfilled pass duab.
Cov hlais ntawm cov hlau tsis muaj zog zoo li elliptical. Cov neeg tsim khoom txuag cov khoom siv los ntawm kev siv ntau dhau ntawm kev txo qis hauv ob theem dov kawg ua ntej ua tiav, txo qis lub zog ntawm cov hlau tuav thiab ua txhaum cov qauv.
High-quality steel muaj ib tug sib xws muaj pes tsawg leeg, ua tiav los ntawm high-tonnage txias txiab, ua rau du thiab txawm txiav xaus. Hauv qhov sib piv, cov ntaub ntawv tsis zoo feem ntau pom qhov tsis sib xws, pitted txiav xaus vim cov khoom tsis zoo, tsis muaj xim hlau. Tsis tas li ntawd, cov chaw ua haujlwm tsis zoo tsim cov txiav txiav tsawg dua, ua rau cov fins loj ntawm lub taub hau thiab tus Tsov tus tw.
Inferior steel tubes muaj impurities ntau dua, muaj qis dua, thiab qhov sib txawv ntawm qhov loj. Yog tsis muaj vernier caliper, lawv tuaj yeem txheeb xyuas los ntawm qhov hnyav. Piv txwv li, ib txoj kab uas hla 20 hli reinforcing steel bar nrog qhov siab tshaj qhov tsis zoo siab ntawm 5% thiab tus qauv ntev ntawm 9M yuav tsum hnyav yam tsawg 114kg (120kg x (1-5%)). Ib qho bar uas hnyav dua 114kg qhia tias cov hlau tsis zoo vim muaj qhov tsis zoo siab ntev. Kev ntsuas tag nrho cov batch yog qhov tseeb dua, xav txog qhov ua yuam kev thiab qhov yuav tshwm sim.
Sab hauv txoj kab uas hla ntawm cov hlau tsis zoo no hloov pauv ntau vim qhov kub tsis ruaj khov (ua rau qhov kub thiab txias), cov khoom siv tsis sib xws, thiab cov khoom siv rudimentary nrog cov hauv paus tsis muaj zog, ua rau cov pob zeb tseem ceeb. Qhov no ua rau muaj qhov sib txawv ntawm qhov sib txawv hauv tib lub lis piam, ua rau tsis sib xws kev ntxhov siab thiab muaj peev xwm tawg.
High-quality raj muaj cov qauv kev lag luam thiab luam ntawv.
Rau cov raj steel nrog txoj kab uas hla tshaj 16 hli, qhov sib nrug ntawm ob lub cim lag luam yuav tsum tshaj 1M.
Lub longitudinal tav ntawm inferior reinforcing steel tuav feem ntau tshwm wavy.
Inferior steel tube factories feem ntau muaj xoob packing vim tsis muaj nyiaj siv ua haujlwm cranes, ua rau oval-shaped sab profiles.
