Cov txheej txheem ntau lawm ntawm cov kav dej seamless steel tuaj yeem muab faib ua ob hom: txias thiab kub-dov. Kub-dov, raws li lub npe qhia, qhov kub ntawm cov dov qhov chaw yog siab, yog li qhov deformation kuj yog me me, uas tuaj yeem ua tiav qhov loj deformation. Siv lub dov ntawm lub phaj steel ua piv txwv. Feem ntau, lub thickness ntawm lub casting dawb paug yog hais txog 230mm, thiab tom qab dov thiab refined dov, qhov kawg thickness yog 1 ~ 20mm. Nyob rau tib lub sij hawm, vim hais tias qhov dav piv ntawm cov hlau phaj me me, qhov loj thiab qhov yuav tsum tau muaj qhov tseeb yog qhov tsawg, nws tsis yooj yim los tshwm sim ntawm cov phaj-zoo li qhov teeb meem, feem ntau yog tswj cov convexity.
Kub dov seamless steel yeeb nkab: Kub dov yog txheeb ze rau txias dov. Txias dov yog dov hauv qab qhov kub ntawm crystallization, thiab kub dov yog dov saum toj no crystallization kub.
qhov zoo
Nws tuaj yeem rhuav tshem lub koom haum casting ntawm steel ingots, kho cov nplej ntawm cov hlau, thiab tshem tawm qhov tsis xws luag ntawm microstrip cov koom haum, kom cov hlau cov ntaub so ntswg yog ntom thiab cov neeg kho tshuab kev ua tau zoo. Qhov kev txhim kho no feem ntau yog tshwm sim hauv kev taw qhia ntawm dov. Yog li ntawd, cov hlau tsis zoo li qub poj niam txiv neej; cov npuas, tawg thiab xoob cua npuas tsim thaum lub sij hawm pouring. Nws tseem tuaj yeem welded nyob rau hauv qhov kub thiab txias.
ua tsis tau
Tom qab kub dov, cov khoom tsis yog xim hlau sib xyaw hauv cov hlau (tsuas yog sulfides thiab oxides, thiab silicate) raug nias rau hauv nyias nyias, thiab txheej (sandwich) tshwm sim. Lub hierarchy ua rau kev ua tau zoo ntawm cov hlau nyob rau hauv lub thickness ntawm lub thickness, thiab nws yog ua tau los rhuav lub txheej thaum lub weld shrinkage. Cov kab mob hauv zos induced welded seams feem ntau ncav cuag ob peb zaug ntawm cov ntsiab lus tawm los, uas yog ntau dua li cov kab mob tshwm sim los ntawm kev thauj khoom.
Seamless steel yeeb nkab yog cov yeeb nkab steel tsis muaj welded cramps ua los ntawm cov txheej txheem kub xws li perforation kub dov. Yog tias tsim nyog, lub raj xa dej tom qab ua haujlwm kub kuj tseem tuaj yeem ua tiav raws li qhov xav tau, qhov loj me thiab kev ua haujlwm. Tam sim no, seamless steel kav (DN{0}}) yog cov kav dej siv ntau tshaj plaws hauv cov khoom siv petrochemical.
Vim tias nws cov txheej txheem tsim khoom sib txawv, nws tau muab faib ua ob hom: kub-dov (squeezing) seamless steel kav thiab cov kav dej txias (dov) seamless steel kav. Cold -rubing (dov) raj muab faib ua ob hom: raj raj thiab alien raj.
ib. Craft process overview
Kub -rolled (squeezing seamless steel yeeb nkab): puag ncig lub raj dawb paug → cua sov → perforation → peb -roller oblique dov, nruam dov los yog squeezing → deserture → tsau txoj kab uas hla (los yog txo txoj kab uas hla) → txias → ncaj → dej siab → dej siab Test ( los yog ntes) → cim → nkag mus rau hauv lub tsev rau khoom.
Cold drawn (dov) seamless steel yeeb nkab: round tube billet → cua sov → perforation → heading → annealing → pickling → oiling (tooj liab plating) → ntau dhau ntawm txias txias (txias dov) → billet raj → tshav kub kho → straightening → dej siab kuaj (Kev kuaj pom tsis zoo) → kos npe → khaws cia.
