SA 204 Gr B Siab Vessel Phaj

SA 204 Gr Byog hais txog ASME SA-204 Qib B, molybdenum- alloy steel phaj tsim rau welded boilers thiab cov hlab ntsha kub siab, feem ntau siv hauv refinery, petrochemical, thiab hluav taws xob tsim kev lag luam rau cov khoom siv xws li reactors, heat exchangers, thiab tanks. Nws muaj lub zog zoo thiab tsim tau, nrog rau cov tshuaj txwv tshwj xeeb (xws li carbon, manganese, molybdenum) thiab cov khoom siv kho tshuab (tensile / yield zog) uas paub qhov txawv ntawm Qib A thiab C.

Cov ntawv thov tseem ceeb

Cov Khoom Siv Hluav Taws Xob & Boilers:Nws yog thawj daim ntawv thov, suav nrog cov khoom siv rau cov chaw tsim hluav taws xob, roj refineries, thiab kev ua tshuaj lom neeg.

Roj & Roj Kev Lag Luam:Siv nyob rau hauv cia tank, pipelines, thiab cov khoom siv los tuav cov roj thiab roj.

Thaum tshav kub kub Exchangers:Haum rau siab - kub, siab - cov khoom siv hluav taws xob hloov hluav taws xob.

Fabricated Piping:Rau cov tshuab xav tau lub zog thiab nruab nrab kub tsis kam.

Reactors & Separators:Siv nyob rau hauv chemical thiab petrochemical processing units.

Vim li cas thiaj siv

Kev Pabcuam Kub Kub:Ua tau zoo nyob rau hauv qhov chaw kub siab, tsis zoo li ntau yam - lub hom phiaj steels.

Alloy Cov ntsiab lus:Muaj molybdenum, uas txhim kho lub zog thiab nkag mus rau ntawm qhov kub siab dua.

Corrosion Resistance:Muaj kev tiv thaiv zoo rau cov kua qaub tawm thiab pitting nyob rau hauv tej yam kev mob, tshwj xeeb tshaj yog piv rau cov pa carbon steels.

Lub zog:Muab lub zog zoo dua thiab thauj khoom -cov kabmob muaj peev xwm rau cov tshuab ua haujlwm siab.

ua

1. Kev xaiv khoom & tshuaj xyuas

Kev Ua Raws Cai: Ua kom cov hlau ua tau raws li ASME BPVC Tshooj II, Ntu A (SA-204/SA-204M).

Kev Tshawb Fawb Tshuaj: Paub meej tias Molybdenum (Mo) cov ntsiab lus nyob nruab nrab ntawm 0.45% -0.60% rau kev nkag siab tsis kam.

Ultrasonic Testing (UT): Feem ntau ua los xyuas cov laminations sab hauv lossis tsis xws luag ua ntej ua.

2. Kev npaj txiav thiab ntug

Txoj kev: Thermal cutting (Oxy-fuel or Plasma) yog ib yam.

Preheating: Rau cov phaj tshaj ib lub thickness (feem ntau yog 1 nti / 25mm), preheating rau 100℃+ thaum txiav yog pom zoo kom tiv thaiv ntug cracking.

Beveling: Mechanical machining los yog sib tsoo ntawm cov npoo kom tshem tawm cov cua sov- cuam tshuam cheeb tsam (HAZ) tshwm sim los ntawm thermal txiav.

3. Kev sib sau (Cold vs. Hot)

Cold forming: Muaj feem xyuam rau daim hlau nyias. Yog hais tias cov fiber ntau elongation ntau tshaj 5%, kev kho cua sov tom qab yuav tsum tau.

Kub txoj kev: Feem ntau ua ntawm 900℃thiab 1050 degree. Yog tias kub sib sau ua tiav, lub phaj yuav tsum tau normalized tom qab ntawd kom rov qab kho cov khoom siv kho tshuab.

4. Vuam txheej txheem

Preheating: Qhov tseem ceeb rau SA-204 Gr. B kom tsis txhob muaj hydrogen-induced cracking. Preheat kub feem ntau yog li ntawm 120℃mus rau 200℃nyob ntawm thickness.

Filler Hlau: Siv qis-hydrogen electrodes uas phim cov ntsiab lus Mo, xws li E7018-A1 (SMAW) lossis F7A2-EA2-A2 (SAW).

Interpass Kub: Yuav tsum tau tswj (feem ntau max 250 degree) kom tswj cov qauv nplej.

5. Kev kho cua sov

Normalizing: Yuav tsum tau rau cov phaj siab tshaj 1.5 nti (40mm) tuab los ua kom zoo dua cov qauv nplej.

Ncej -Weld Heat Treatment (PWHT): Yuav tsum tau siv rau feem ntau ntawm cov hlab ntsha siab.

Kub: Feem ntau ntawm 595℃thiab 650℃(1100℃F-1200℃F).

Lub sij hawm tuav: Feem ntau 1 teev ib nti ntawm thickness. Qhov no txo ​​cov kev ntxhov siab seem thiab txhim kho ductility.

6. Kev Ntsuas thiab Kev Tswj Xyuas Zoo (NDT)

Radiographic Testing (RT): Tshawb xyuas qhov zoo ntawm welds.

Kev Xeem Hardness: Kom paub meej tias PWHT ua haujlwm tau zoo thiab cov khoom tsis dhau - tawv.

Hydrostatic Test: Kev sim siab kawg ntawm lub nkoj ua tiav kom ntseeg tau cov qauv kev ncaj ncees.

Hu rau tam sim no

Tau txais cov lus hais muaj nuj nqis rau SA 204 Gr. B, Hu rau GNEE Steel.

SA 204 Gr B yog dab tsi?

SA 204 Gr B yog qis- alloy steel phaj rau cov hlab ntsha siab, feem ntau yog tsim los ntawm carbon thiab manganese. Nws muaj qhov zoo weldability thiab siab -kub tsis kam, dav siv hauv boiler thiab siab nkoj tsim.

Tus qauv twg SA 204 Gr B ua raws? 

Nws ua raws li ASME Boiler thiab Pressure Vessel Code (Section II, Part A). Cov qauv no qhia txog nws cov tshuaj lom neeg muaj pes tsawg leeg, cov khoom siv kho tshuab thiab kev tsim khoom.

Dab tsi yog cov tshuaj tseem ceeb ntawm SA 204 Gr B? 

Nws cov khoom tseem ceeb suav nrog C ( Tsawg dua lossis sib npaug li 0.27%), Mn (0.70-1.00%), Si (0.15-0.40%), P (Less dua lossis sib npaug rau 0.035%) thiab S (tsawg dua lossis sib npaug li 0.035%), nrog cov kab tsis huv tswj xyuas nruj.

Puas yog SA 204 Gr B yooj yim rau vuam? 

Yog, nws muaj zoo weldability. Tsis xav tau preheating rau nyias daim hlau, tab sis preheating ntawm 100-150℃yog pom zoo rau cov phaj tuab los tiv thaiv weld tawg.

Cov txheej txheem vuam zoo li cas rau SA 204 Gr B? 

Cov txheej txheem tsim nyog muaj xws li shielded hlau arc vuam (SMAW), roj hlau arc vuam (GMAW) thiab submerged arc vuam (SAW), uas hloov mus rau qhov sib txawv ntawm cov qauv vuam xav tau.

Puas yog SA 204 Gr B xav tau tom qab-weld heat treatment (PWHT)? 

PWHT feem ntau yog xav tau rau cov phaj tuab lossis cov khoom siv sib txuas. Nws relieves welding kev nyuaj siab, txhim kho weld toughness thiab ua kom muaj kev ncaj ncees.

Dab tsi yog daim ntawv thov Scope ntawm SA 204 Gr B hauv cov chaw tsim hluav taws xob? 

Hauv cov chaw tsim hluav taws xob, nws yog siv rau kev tsim cov boiler headers, cov kav dej thiab cov hlab ntsha siab, hloov mus rau siab -kub qhov chaw ua haujlwm tau zoo.

Yuav ua li cas kuaj cov khoom siv kho tshuab ntawm SA 204 Gr B? 

Kev ntsuas tensile, kev ntsuas cuam tshuam thiab kev sim hardness yog yuav tsum tau. Tensile kuaj xyuas lub zog, thaum qhov kev ntsuas cuam tshuam ntsuas qhov toughness nyob rau hauv dynamic load.

Dab tsi yog qhov kev lees paub rau SA 204 Gr B weld defects? 

Weld defects yuav tsum ua raws li ASME Tshooj IX. Kev tawg, tsis tiav fusion thiab lwm yam kev puas tsuaj tsis raug tso cai, thiab cov teeb meem me me yuav tsum tau kho.

Puas yog SA 204 Gr B yuav tsum tau kuaj xyuas qhov zoo? 

Yog, nto yuav tsum tsis muaj kab nrib pleb, khawb thiab suav nrog. Surface roughness thiab defects raug tshuaj xyuas qhov muag thiab los ntawm NDT txoj kev.