Hauv kev lag luam piping thiab kev siv cov txheej txheem,seamless steel kavtuav ib txoj hauj lwm tseem ceeb vim lawv qhov zoo. Lawv qhov sib txawv ntawm cov kav dej welded thiab lawv cov yam ntxwv tseem ceeb yog qhov tseem ceeb hauv kev xaiv cov yeeb nkab zoo.
Seamless steel kav muaj qhov zoo tseem ceeb ntawm cov kav dej welded. Welded kav yog tsim los ntawm welding steel daim hlau ua ke, ua rau weld seams. Qhov no inherently txwv lawv lub siab tsis kam thiab tuaj yeem ua rau cov dej xau nyob rau hauv high-temperature thiab high-pressure tej yam kev mob vim muaj kev nyuaj siab concentration ntawm seams. Seamless steel kav, ntawm qhov tod tes, yog tsim los ntawm ib txheej txheem yob txoj kev, tshem tawm cov seams. Lawv tuaj yeem tiv taus qhov kub thiab txias dua, ua rau lawv txhim khu kev qha hauv cov ntawv thov xws li roj thiab roj tsheb thauj mus los thiab cov boilers siab. Tsis tas li ntawd, seamless steel kav muaj ntau dua phab ntsa thickness uniformity, tshem tawm cov phab ntsa thickness variations tshwm sim los ntawm welding, txhim kho cov qauv stability, thiab muab kev txhim khu corrosion kuj. Lawv lub neej kev pabcuam feem ntau yog 30% ntev dua li cov kav dej welded.
Cov txheej txheem ntau lawm rau seamless steel kav yog nruj thiab complex, feem ntau nrog kub dov thiab txias kos duab. Cov txheej txheem kub dov ua kom sov cov khoom steel hlau mus rau kwv yees li 1200 ° C, tom qab ntawd yob nws los ntawm lub tshuab tho rau hauv lub raj hollow. Lub raj xa mus los ntawm ib lub sizing zeb los kho txoj kab uas hla thiab txo lub zeb los tswj cov phab ntsa thickness. Thaum kawg, nws dhau los ua kom txias, ncaj, thiab nrhiav pom qhov tsis zoo. Cov txheej txheem kos duab txias siv lub raj kub dov ua raw khoom. Tom qab pickling kom tshem tawm cov nplai oxide, nws yog kos rau hauv cov duab siv lub tshuab txias-daws. Annealing yog tom qab ntawd yuav tsum tau tshem tawm cov kev ntxhov siab sab hauv, ua kom tiav thiab tshuaj xyuas. Ntawm ob txoj kev, cov raj kub dov yog tsim rau cov kab loj loj thiab cov phab ntsa tuab, thaum cov hlab ntsha txias yog qhov zoo dua rau cov kab me me thiab cov ntawv thov siab.
Seamless steel kav suav nrog cov qib hauv tsev thiab thoob ntiaj teb cov qauv kom tau raws li cov kev xav tau sib txawv.
Cov khoom siv hauv tsev feem ntau yog carbon steel thiab alloy steel:
20 # steel, feem ntau siv carbon steel, muaj cov yas zoo heev thiab yooj yim ntawm kev ua, ua rau nws siv dav hauv cov kav dej dav dav.
45 # steel muaj zog dua thiab tsim nyog rau cov khoom siv kho tshuab. Ntawm cov yeeb nkab steel hlau, 15CrMo steel tiv taus qhov kub thiab txias, ua rau nws yog cov khoom siv tseem ceeb rau hluav taws xob cog boilers.
304 stainless hlau seamless yeeb nkab, vim nws zoo heev corrosion kuj, yog heev nyiam nyob rau hauv cov tshuaj thiab zaub mov kev lag luam.
Cov ntaub ntawv txheej txheem thoob ntiaj teb kuj tau siv dav:
Raws li US ASTM tus qauv,A106-B carbon steel seamless yeeb nkabyog ib qho kev xaiv rau kev thauj mus los ntawm cov roj thiab cov nkev. Nws lub zog tensile ncav cuag 415-550 MPa thiab tuaj yeem tiv taus kev ua haujlwm kub ntawm -29 ° C txog 454 ° C.
A335-P91 alloy yeeb nkab, ua tsaug rau nws cov chromium-molybdenum-vanadium alloy muaj pes tsawg leeg, muaj qhov kub thiab txias zog thiab oxidation tsis kam, ua rau nws nquag siv nyob rau hauv lub ntsiab chav piping ntawm supercritical fais fab nroj tsuag boilers.
Raws li European EN tus qauv, P235GH carbon steel los ntawm EN 10216-2 series yog tsim rau nruab nrab- thiab qis-siab boilers thiab siab hlab ntsha.
P92 alloy yeeb nkab tshaj P91 nyob rau hauv high-temperature endurance zog thiab yog qhov kev xaiv rau loj-scale thermal zog tej yaam num. JIS-standard STPG370 carbon yeeb nkab muaj cov nqi-zoo thiab yog dav siv nyob rau hauv kev lag luam piping.
SUS316L stainless hlau yeeb nkab, raws li 304 stainless hlau, ntxiv molybdenum los txhim kho nws cov kev tiv thaiv chloride ion corrosion, ua rau nws tsim nyog rau marine engineering thiab tshuaj lom neeg acid thiab alkali thauj.
Nyob rau hauv cov nqe lus ntawm qhov ntev, seamless steel kav muaj nyob rau hauv sab nraud txoj kab uas hla ntawm 10mm mus rau 630mm, nrog phab ntsa thicknesses ntawm 1mm mus rau 70mm.
Nyob rau hauv cov pa engineering, txheej diameters ntawm 15mm mus rau 108mm thiab phab ntsa thicknesses ntawm 2mm mus rau 10mm feem ntau yog siv.
Piv txwv li, cov kav dej nrog ib txoj kab uas hla ntawm 25 hli thiab phab ntsa thickness ntawm 3 hli feem ntau yog siv nyob rau hauv hydraulic systems, hos cov kav nrog ib tug txheej txoj kab uas hla ntawm 89 hli thiab phab ntsa thickness ntawm 6 hli yog haum rau tshuaj lom neeg kev thauj mus los.
Ua ntej, txheeb xyuas cov ntaub ntawv pov thawj los xyuas kom meej tias cov tshuaj muaj pes tsawg leeg thiab cov khoom siv tshuab ua tau raws li cov qauv tsim. Piv txwv li, lub zog tawm los ntawm 20 # steel yuav tsum tsis pub tsawg tshaj 245 MPa, thiab lub zog ntawm ASTM A106-B yuav tsum yog ≥240 MPa.
Qhov thib ob, tshuaj xyuas qhov zoo ntawm qhov zoo. Qhov saum npoo yuav tsum tsis muaj qhov tsis xws luag xws li tawg thiab folds, thiab phab ntsa thickness sib txawv yuav tsum tau tswj tsis pub dhau ± 10%.
Tsis tas li ntawd, xaiv cov khoom lag luam nrog cov txheej txheem tsim nyog thiab cov ntaub ntawv raws li kev thov scenario. Cov kav dej kub dov thiab cov alloys xws li A335-P91 yog qhov nyiam rau qhov chaw muaj kev kub ntxhov, thaum cov kav dej txias tau pom zoo rau kev ntsuas qhov tseeb. SUS316L stainless hlau kav yog pom zoo rau marine los yog high-corrosion ib puag ncig.
Thaum kawg, thov kom tus neeg muag khoom muab daim ntawv qhia txog qhov tsis txaus ntseeg, tsom mus rau kev txheeb xyuas qhov tsis xws luag sab hauv kom tsis txhob muaj teeb meem zoo uas tuaj yeem cuam tshuam txog kev nyab xeeb ntawm txoj haujlwm.
Qhov no xaus qhov kev sib tham rau qhov teeb meem no. Yog tias koj xav paub ntau ntxiv txog seamless steel kav, thov hu rau peb los ntawm cov hauv qab no thiab peb pab neeg muag khoom yuav zoo siab los pab koj.
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Post lub sij hawm: Sep-04-2025