Qhov sib txawv ntawm cov qauv thiab kev tso chaw
GB/T 9948: Nws siv tau rau cov kav hlau tsis muaj seamless hauv nruab nrab thiab kub siab (≤500 ℃) xws liroj av tawgthiabcov khoom siv tshuaj lom neeg, thiab yog tus qauv yeeb nkab tshwj xeeb.
GB/T 5310: Tsim tshwj xeeb raucov boilers siab(cov yam ntxwv ntawm cov pa roj ≥9.8MPa), nws hais txog kev nyab xeeb mus sij hawm ntev hauv qab qhov kub thiab txias thiab siab thiab yog tus qauv tseem ceeb rau cov raj boiler.
Qhov sib txawv tseem ceeb hauv cov khoom siv thiab kev ua tau zoo
Cov tshuaj lom neeg muaj pes tsawg leeg
Piv nrog 20 hlau,20Ghlau muaj kev tswj hwm nruj dua ntawm cov khoom tsis huv (xws li P ≤ 0.025%, S ≤ 0.015%), thiab xav kom tag nrho cov khoom seem (Cu, Cr, Ni, thiab lwm yam) yuav tsum yog ≤ 0.70% kom ntseeg tau tias muaj kev ruaj khov ntawm qhov kub siab.
Cov khoom siv kho tshuab
Lub zog tensile ntawm chav tsev kub ntawm 20G (410-550MPa) zoo li sib tshooj nrog 20 hlau (≥410MPa), tab sis 20G yuav tsum tau ntxiv kom ntseeg tau tias muaj zog tiv taus kub siab ntawm 450 ℃ (≥110MPa), uas yog qhov yuav tsum tau ua rau cov raj boiler.
Cov qauv me me
20G yuav tsum tau kuaj xyuas qib spheroidization ntawm pearlite (≤ qib 4) kom tiv thaiv kev puas tsuaj ntawm microstructure tom qab kev pabcuam kub ntev, thaum 20G hlau tsis muaj qhov yuav tsum tau ua li ntawd.
Qhov sib txawv ntawm cov txheej txheem tsim khoom
Kev kho cua sov
20G yuav tsum tau kho kom zoo li qub (Ac3 + 30 ℃) kom ntseeg tau tias cov noob loj ntawm qib 5-8. 20 hlau tuaj yeem raug annealed lossis normalized, thiab kev tswj cov txheej txheem yog xoob heev.
Kev sim tsis puas tsuaj
20G xav tau kev kuaj xyuas qhov tsis zoo ntawm ultrasonic thiab kev kuaj eddy tam sim no rau txhua daim, thaum 20G hlau feem ntau tsuas yog xav tau kev kuaj xyuas qauv xwb.
Kev sib piv ntawm cov xwm txheej ntawm daim ntawv thov
20GCov chaw ua hluav taws xob boilers (phab ntsa txias nrog dej, superheaters), cov tshuaj lom neeg siab siab reactors (xwm txheej nrog tsim kub > 350 ℃)
20 hlauCov raj xa dej rau cov cua sov hauv cov chaw ua roj, cov kav dej rau cov chaw lim cua thiab cov chaw lim dej (kub feem ntau < 350 ℃)
Cov Kev Cai Rau Daim Ntawv Pov Thawj
Cov kav hlau 20G yuav tsum tau txais Daim Ntawv Tso Cai Tsim Khoom Siv Tshwj Xeeb (TS daim ntawv pov thawj), thiab txhua pawg yuav tsum muab daim ntawv qhia txog kev ua haujlwm kub siab. 20 hlau tsuas yog xav tau daim ntawv pov thawj zoo ib txwm muaj.
Cov lus qhia xaiv:
Thaum nws los txog rau ASME lossis PED daim ntawv pov thawj projects, 20G tuaj yeem sib haum rauSA-106B/ASTM A192, thaum 20 hlau tsis muaj kev sib raug zoo ncaj qha rau cov ntaub ntawv txheem Asmeskas.
Rau cov xwm txheej ua haujlwm siab dua 540 ℃, cov hlau sib xyaw xws li 12Cr1MoVG yuav tsum tau xav txog. Qhov txwv siab tshaj plaws ntawm qhov kub siv tau rau 20G yog 480 ℃ (qhov tseem ceeb ntawm graphitization ntawm cov hlau carbon).
Lub sijhawm tshaj tawm: Tsib Hlis-23-2025
