1. Cov tshuaj muaj pes tsawg leeg thiab kev ua tau zoo ntawm API 5L X80 welded kav yog dab tsi, thiab vim li cas lawv thiaj siv dav hauv - cov roj thiab roj kav ntev?Teb: API 5L X80 welded kav yog siab -lub zog qis- alloy (HSLA) steel kav nrog cov tshuaj lom neeg hauv qab no: carbon (C: 0.14% max), manganese (Mn: 1.80% max), chromium (Cr: 0.50% max), molybdenum (% 0.30: Molybdenum: Molybdenum: 0.50%) 0.06% max), vanadium (V: 0.06% max), thiab titanium (Ti: 0.02% max). Lawv cov yam ntxwv ua tau zoo yog: lub zog siab (tsawg kawg yield zog 551 MPa, tensile zog 620-750 MPa), zoo toughness (lub zog cuam tshuam loj dua los yog sib npaug rau 40 J ntawm -20 degree), weldability zoo heev, thiab zoo corrosion kuj. Lawv tau dav siv nyob rau hauv cov kav dej ntev thiab cov roj av vim: 1) Lub zog siab tso cai rau cov phab ntsa ntawm cov yeeb nkab nyias nyias nyob rau hauv tib lub siab, txo cov khoom siv thiab cov nqi tsheb thauj mus los . 2) Zoo toughness thiab weldability kom ntseeg tau tias lub raj xa dej muaj kev ncaj ncees thiab kev ntseeg siab, txawm tias nyob rau hauv ib puag ncig hnyav (xws li cov cheeb tsam txias, av qeeg thaj tsam) . 3 corosion resistance) {20} pipeline kev pab cuam lub neej, txo cov nqi tu.
2. Yuav ua li cas xaiv ntawm seamless thiab welded API 5L X65 kav rau ib tug offshore roj pipeline, thiab dab tsi yog qhov tseem ceeb rau xav txog?Teb: Thaum xaiv ntawm seamless thiab welded API 5L X65 kav rau ib tug offshore roj pipeline, lub ntsiab yam tseem ceeb yuav tsum tau xav txog yog tus nqi, ntau lawm efficiency, pipeline txoj kab uas hla, thiab kev pab cuam ib puag ncig. Welded API 5L X65 kav (tshwj xeeb tshaj yog UOE lossis JCOE welded kav) muaj qhov zoo hauv qab no: 1) Tus nqi qis: welded kav tuaj yeem ua rau hauv cov kab loj (txog 1422 hli) nrog cov khoom siv qis dua thiab cov nqi tsim khoom piv rau cov kav dej seamless . 2) Kev ua haujlwm ntau dua: cov kav dej loj loj yog ua tau, {8} cov dej num uas tsim nyog adaptability: tuaj yeem tsim nyob rau hauv ntau cov phab ntsa thicknesses kom tau raws li cov kev xav tau sib txawv. Seamless API 5L X65 cov kav dej muaj qhov zoo ntawm qhov tsis muaj vuam seam, yog li lawv muaj kev ruaj siab zoo dua thiab corrosion kuj nyob rau hauv qhov chaw huab cua (xws li sib sib zog nqus- hiav txwv siab- qhov chaw siab). Txawm li cas los xij, cov kav dej seamless yog kim dua thiab muaj kev txwv hauv cov kab loj loj. Rau cov kav dej sab nraud nrog cov kab loj loj (Ntau dua lossis sib npaug li 600 mm) thiab nruab nrab siab (tsawg dua lossis sib npaug rau 14 MPa), welded X65 kav yog nyiam vim yog tus nqi{20}} ua tau zoo. Rau qhov sib sib zog nqus - cov kav dej hiav txwv nrog kev kub siab (Ntau dua lossis sib npaug ntawm 14 MPa) lossis qhov chaw muaj kev xeb hnyav, cov kav dej X65 seamless tej zaum yuav tsim nyog kom muaj kev nyab xeeb thiab kev ntseeg tau.
3. Dab tsi yog qhov yuav tsum tau ua ntawm EN 10219 Qib S355JR welded kav rau kev siv cov qauv, thiab yuav ua li cas los xyuas lawv cov kev ua raws?Teb: EN 10219 Qib S355JR welded kav yog cov qauv steel kav nrog cov kev ua haujlwm hauv qab no: 1) Cov khoom siv tshuab: cov khoom muaj zog tsawg kawg nkaus 355 MPa, tensile zog 470-630 MPa, cuam tshuam lub zog ntau dua lossis sib npaug ntawm 34 J ntawm 20℃. 2) cov kav dej ncaj nraim Ua tau raws li EN 10219 tus qauv. 3) Weld seam zoo: tsis muaj kab nrib pleb, tsis tiav fusion, lossis lwm yam tsis xws luag; lub weld seam lub zog yuav tsum sib npaug rau cov hlau hauv paus. 4) Qhov zoo: tsis muaj xeb, khawb, lossis qhov tsis xws luag uas cuam tshuam rau kev ua haujlwm ntawm cov qauv. Txhawm rau txheeb xyuas qhov ua tau raws li: 1) Ua cov cuab yeej ntsuas kev ntsuas (tensile test, impact test, dabtsi yog khoov test) ntawm cov yeeb nkab thiab vuam seam . 2) Ua qhov kev soj ntsuam qhov ntev los xyuas cov kab, phab ntsa thickness, thiab lwm yam tsis zoo . 3) Ua qhov ntsuas qhov tsis xws luag (UT, RT, VT) kom ntseeg tau tias cov khoom siv hlau ua tau raws li qhov sib txawv ntawm cov khoom siv tshuaj lom neeg (tshuaj xyuas cov khoom siv hlau) . 2} xyuas cov khoom zoo ntawm cov hlau; S355JR cov qauv (C Tsawg dua lossis sib npaug rau 0.20%, Mn Tsawg dua lossis sib npaug rau 1.60%, P Tsawg dua lossis sib npaug rau 0.035%, S Tsawg dua lossis sib npaug 0.035%).
4. Dab tsi yog qhov cuam tshuam ntawm phab ntsa tuab ntawm qhov vuam zoo thiab cov khoom siv kho tshuab ntawm ASTM A106 Qib C welded kav, thiab yuav ua li cas tswj cov phab ntsa thickness thaum lub sij hawm tsim khoom? Answer: The wall thickness of ASTM A106 Grade C welded pipes has a significant impact on welding quality and mechanical properties. For thick-walled pipes (wall thickness >20 hli), qhov nyuaj vuam nce: cov cua kub tawm tswv yim yuav tsum tau nce ntxiv kom ntseeg tau tias kev nkag mus tau tiav, tab sis cov khoom siv hluav taws xob ntau dhau tuaj yeem ua rau cov qoob loo loj hlob, txo cov tawv nqaij, thiab nce cov welding residual stress. Tsis tas li ntawd, tuab- cov kav dej uas muaj phab ntsa yog qhov ua rau muaj qhov tsis xws luag xws li kev ua tsis tiav fusion thiab tawg. Rau nyias- cov kav dej (phab ntsa thickness<10 mm), excessive heat input can cause burn-through or deformation, affecting the pipe's dimensional accuracy and strength. To control the wall thickness during production: 1) Strictly inspect the raw material (steel plate/coil) to ensure its thickness meets the requirements. 2) Control the forming process: adjust the forming rollers and pressure to ensure uniform wall thickness during pipe forming. 3) Use appropriate welding parameters (current, voltage, speed) according to the wall thickness: for thick-walled pipes, use multi-layer multi-pass welding; for thin-walled pipes, use small current and fast welding speed. 4) Conduct dimensional inspection during and after production to ensure the wall thickness is within the standard range (ASTM A106 Grade C wall thickness range: 3.05-120.65 mm).
5. Dab tsi yog cov yam ntxwv ntawm corrosion kuj ntawm ASTM A312 Qib 317L welded kav, thiab nyob rau hauv cov tshuaj lom neeg tshaj tawm lawv yog dab tsi?Teb: ASTM A312 Qib 317L welded kav yog austenitic stainless hlau nrog cov ntsiab lus molybdenum siab dua (Mo: 3.00-4.00%) dua Qib 316L, nrog rau chromium (Cr: 18.0-20.0%) thiab npib tsib xee (cov ntsiab lus tsawg dua 9.0%) thiab npib tsib xee (15.0%). tshaj los yog sib npaug li 0.03%). Lawv cov yam ntxwv tiv thaiv corrosion yog: 1) Kev tiv thaiv zoo heev rau pitting corrosion thiab crevice corrosion, tshwj xeeb tshaj yog nyob rau hauv high-chloride ib puag ncig, vim muaj cov ntsiab lus molybdenum siab . 2) Zoo tiv thaiv rau acidic media (xws li sulfuric acid, phosphoric acid) thiab alkaline media . 3) Resistance to intergranular corrosion, ua tsaug. Lawv yog cov tsim nyog tshaj plaws rau kev siv tshuaj lom neeg xws li: 1) Cov tshuaj chloride siab (xws li dej hiav txwv, brine, thiab tshuaj lom neeg cov tshuaj uas muaj cov tshuaj chloride ions). 2) Dilute mus rau nruab nrab cov ntsiab lus ntawm sulfuric acid, phosphoric acid, thiab acetic acid. 3) Corrosive media hauv kev ua tshuaj lom neeg, kev kho dej, thiab dej pov tseg. Lawv kuj tau siv nyob rau hauv marine engineering thiab offshore roj thiab roj platforms qhov twg corrosion kuj tseem ceeb heev.
