1. Lus nug:Dab tsi yog qhov siab tshaj plaws nominal txoj kab uas hla muaj rau welded kav ntawm API 5L Qib X70, thiab lub vuam seam tiv thaiv li cas thaum tsim khoom?Teb:Qhov siab tshaj plaws nominal txoj kab uas hla muaj rau API 5L Qib X70 welded kav feem ntau yog 60 ntiv tes (1524 hli), tab sis qee cov tuam ntxhab tuaj yeem tsim cov kab loj dua (txog 72 ntiv tes) rau cov haujlwm tshwj xeeb. Thaum lub sij hawm tsim khoom, lub weld seam muaj kev tiv thaiv kom tsis txhob muaj kab mob thiab ua kom lub siab zoo - weld. Rau cov kav dej ERW, lub vuam seam yog tiv thaiv los ntawm cov roj inert (xws li, argon) los yog txheej txheej flux los tiv thaiv cov hlau molten los ntawm oxygen thiab nitrogen hauv huab cua. Rau cov kav dej SAW, cov weld yog submerged nyob rau hauv granular flux, uas tsis tsuas yog tiv thaiv cov weld, tab sis kuj tshem tawm impurities thiab txhim kho lub weld lub mechanical zog. Tsis tas li ntawd, tom qab- vuam tu (xws li, sib tsoo, pickling, thiab passivation) yog ua kom tshem tawm cov oxide nplai lossis cov dej ntws tawm, uas tuaj yeem txo cov yeeb nkab corrosion kuj.
2. Lus nug:Cov ntsiab lus molybdenum hauv Qib 317L stainless hlau welded kav li cas txhim kho lawv cov corrosion kuj piv rau Qib 316L?Teb:Qib 317L stainless hlau welded kav muaj ntau dua molybdenum (Mo) cov ntsiab lus (3-4%) piv rau Qib 316L (2-3%), uas txhim kho lawv cov corrosion kuj, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig hnyav. Molybdenum txhim khu lub passive oxide txheej ntawm cov yeeb nkab saum npoo, ua rau nws tiv taus ntau dua rau pitting, crevice corrosion, thiab dav corrosion nyob rau hauv chloride-nplua nuj thiab acidic media. Piv txwv li, nyob rau hauv ib puag ncig uas muaj siab concentrations ntsev (xws li, marine daim ntaub ntawv), sulfuric acid, los yog phosphoric acid, 317L outperforms 316L los ntawm kev txo cov kev pheej hmoo ntawm localized corrosion. Lub ntsiab lus "L" hauv ob qib qhia tias cov ntsiab lus qis qis (C Tsawg dua lossis sib npaug li 0.03%), uas tiv thaiv kev cuam tshuam ntawm intergranular thaum vuam . 317L yog li siv rau hauv cov ntawv thov ntau dua, xws li cov chaw ua tshuaj, cov chaw desalination, thiab cov dej khib nyiab, qhov kev tiv thaiv corrosion yog qhov tseem ceeb.
3. Lus nug:Dab tsi yog cov ntawv thov ntawm EN 10217-1 Qib P235GH welded steel kav, thiab lawv qhov kub thiab txias rau kev pabcuam yog dab tsi?Teb:TS EN 10217-1 Qib P235GH welded steel kav feem ntau yog siv hauv kev siv lub nkoj siab thiab boiler, nrog rau kev thauj mus los ntawm cov kua dej kub kub (xws li cov kav dej). Lawv tau tsim los rau kev pabcuam hauv qhov kub thiab txias xws li -20℃(-4℃F) txog 400℃(752℃F), ua rau lawv tsim nyog rau kev siv qis rau nruab nrab thiab siab. Lawv cov cuab yeej tseem ceeb (lub zog tensile Ntau dua los yog sib npaug rau 360 MPa, lub zog tawm los ntau dua lossis sib npaug ntawm 235 MPa, elongation Ntau dua lossis sib npaug li 26%) thiab cov khoom siv weldability zoo ua rau lawv zoo tagnrho rau kev tsim boilers, tshav kub exchangers, thiab siab hlab ntsha hauv cov fais fab nroj tsuag, chemical factories, thiab cua sov systems. Tsis tas li ntawd, P235GH muaj cov thermal conductivity zoo, uas tso cai rau kev hloov hluav taws xob zoo hauv boiler thiab hluav taws kub exchanger daim ntaub ntawv.
4. Lus nug:Qhov txawv ntawm Qib Q345B thiab Q355B welded steel kav (GB / T 3091), thiab thaum twg koj yuav tsum xaiv Q355B?Teb:Qhov sib txawv tseem ceeb ntawm GB / T 3091 Qib Q345B thiab Q355B welded steel kav yog lawv cov yield zog: Q345B muaj qhov tsawg kawg nkaus yield zog ntawm 345 MPa, thaum Q355B muaj qhov tsawg kawg nkaus yield zog ntawm 355 MPa. Tsis tas li ntawd, Q355B muaj lub zog tensile siab dua me ntsis (Ntau dua lossis sib npaug ntawm 470 MPa vs. Q345B's Ntau dua lossis sib npaug rau 470 MPa-tib tensile, tab sis siab dua tawm los) thiab zoo dua cuam tshuam toughness ntawm qhov kub thiab txias (-20℃rau Q1355B} tab sis muaj { stricter impact requirements). Koj yuav tsum xaiv Q355B thaum daim ntawv thov xav tau ntau dua load- bearing peev thiab zoo dua toughness, xws li nyob rau hauv structural engineering (bridges, siab-nce vaj tse), hnyav machinery, thiab siab -tsheb thauj mus los. Q345B yog tus nqi ntau dua rau cov kev siv dav dav uas qis zog txaus, xws li dej, dej ntws, thiab kev siv lub teeb.
5. Lus nug:Yuav ua li cas welded kav ntawm ASTM A671 Qib CC60 carbon steel kuaj rau qis-kub toughness, thiab dab tsi yog qhov tsawg kawg nkaus cuam tshuam lub zog yuav tsum tau?Teb:Welded kav ntawm ASTM A671 Qib CC60 carbon steel raug sim rau qis-kub toughness siv Charpy V-notch (CVN) cuam tshuam kuaj. Qhov kev sim no suav nrog kev txiav V-cov qauv ntawm cov yeeb nkab (xws li cov vuam seam thiab cua sov- thaj tsam cuam tshuam) thiab ntaus nws nrog lub pendulum ntawm qhov ntsuas kub (feem ntau yog -29℃[-20℃F] rau Qib CC60). Yam tsawg kawg nkaus lub zog yuav tsum tau rau ASTM A671 Qib CC60 yog 27 J (20 ft-lb) ntawm -29 degree. Qhov kev sim no ua kom ntseeg tau tias cov yeeb nkab tuaj yeem tiv taus qhov cuam tshuam tam sim ntawm qhov kub thiab txias yam tsis muaj qhov tawg, uas yog qhov tseem ceeb rau kev siv hauv cov huab cua txias, xws li offshore roj thiab roj pipelines, lub tshuab tub yees, thiab kev thauj mus los ntawm cov kua dej qis. Yog tias qhov cuam tshuam lub zog qis dua qhov yuav tsum tau ua tsawg kawg nkaus, cov yeeb nkab raug tsis lees paub lossis rov ua dua los txhim kho nws cov tawv nqaij.
