Cov raj hlau, uas yog ib qho tseem ceeb ntawm cov khoom siv hlau, tau muab faib ua ob pawg loj: seamless steel tubes (ua los ntawm cov hlau puag ncig) thiab welded steel hlab (ua los ntawm daim hlau los yog strip billets), raws li lawv cov txheej txheem tsim khoom thiab cov duab ntawm cov hlau. tube billets siv.
Cold-rolled formed steel tso cai rau lub zos buckling ntawm tus ntoo khaub lig-section, enabling tag nrho cov kev siv ntawm load-bearing muaj peev xwm tom qab buckling ntawm tus tswv cuab. Nyob rau hauv sib piv, kub-dov hlau seem tsis tso cai rau lub zos buckling ntawm tus ntoo khaub lig-section.
Qhov ua rau muaj kev ntxhov siab nyob hauv cov khoom kub-kuav los tiag thiab txias-kuav los tiag steel seem sib txawv, ua rau muaj ntau yam sib txawv ntawm lawv cov ntu ntu. Qhov seem kev ntxhov siab faib nyob rau hauv txias-tsim nyias-walled steel seem yog ib hom dabtsi yog khoov, whereas nyob rau hauv kub dov los yog welded steel seem, nws yog ib hom membrane.
Muaj qhov sib txawv me ntsis ntawm ob hom steel tube nyob rau hauv cov nqe lus ntawm cov khoom tiav, raws li lawv feem ntau yog tsim los rau cov qauv specifications. Cov khoom siv tshuab kuj zoo sib xws, nrog rau qhov sib txawv ntawm qhov kev dag hauv cov txheej txheem tsim khoom thiab qhov ua tau zoo. Feem ntau, txias-drawn steel tubes pom qhov tseeb dua qhov tseeb thiab qhov chaw tiav.
Welded steel hlab, tseem hu ua welded kav, yog tsim los ntawm curling thiab vuam steel daim hlau los yog strips. Cov txheej txheem ntau lawm ntawm welded steel hlab yog yooj yim, npaum, thiab ntau yam, xav tau cov cuab yeej siv tsawg thiab peev peev. Txawm li cas los xij, lawv lub zog feem ntau qis dua li ntawm seamless steel raj.
Welded steel hlab yog ntxiv cais rau hauv cov seam ncaj welded kav thiab kauv welded kav raws li daim ntawv ntawm weld seam. Kauv welded kav feem ntau muaj lub zog siab dua li cov kav dej ncaj nraim welded, tso cai rau kev tsim cov kav dej loj dua los ntawm cov khoom nqaim. Lawv kuj ua kom cov kav dej sib txawv ntawm cov khoom sib txawv ntawm tib qhov dav ntawm cov khoom. Txawm li cas los xij, piv rau cov kav dej ncaj nraim ntawm tib qhov ntev, cov kav dej welded kav muaj qhov ntev ntawm cov hlua khi tau nce los ntawm 30-100%, thiab lawv qhov nrawm dua. Yog li ntawd, cov kav dej me me feem ntau yog tsim los ntawm cov kav hlau ncaj ncaj, thaum cov kav dej loj dua feem ntau yog tsim los ntawm kev siv cov welding.
