Qhov sib txawv ntawm cov qauv thiab qhov chaw
GB/T 9948: Nws muaj feem xyuam rau seamless steel kav nyob rau hauv nruab nrab thiab high-kub (≤500 ℃) scenarios xws liroj av tawgthiabcov khoom siv tshuaj, thiab belongs rau tus qauv yeeb nkab tshwj xeeb.
GB/T 5310: Tshwj xeeb tsim rauhigh-pressure boilers(chav tsis muaj ≥9.8MPa), nws hais txog kev nyab xeeb mus sij hawm ntev nyob rau hauv qhov kub thiab txias thiab yog tus qauv tseem ceeb rau boiler hlab.
Qhov sib txawv tseem ceeb ntawm cov khoom siv thiab kev ua haujlwm
Tshuaj muaj pes tsawg leeg
Piv nrog 20 steel,20 Gsteel muaj kev tswj nruj dua impurities (xws li P≤0.025%, S≤0.015%), thiab yuav tsum muaj tag nrho cov khoom seem (Cu, Cr, Ni, thiab lwm yam) kom ≤0.70% kom ntseeg tau tias qhov kub thiab txias.
Mechanical zog
Lub zog tensile ntawm chav tsev kub ntawm 20G (410-550MPa) zoo li sib tshooj nrog 20 steel (≥410MPa), tab sis 20G yuav tsum tau ntxiv kom ntseeg tau lub siab kub-kub endurance zog ntawm 450 ℃ (≥110MPa), uas yog lub hauv paus yuav tsum tau rau boiler hlab.
Microstructure
20G yuav tsum tau kuaj xyuas rau qib spheroidization ntawm pearlite (≤ qib 4) txhawm rau tiv thaiv microstructure deterioration tom qab kev pabcuam kub kub mus ntev, thaum 20G steel tsis muaj qhov yuav tsum tau ua.
Kev tsim cov txheej txheem sib txawv
Kev kho cua sov
20G yuav tsum tau txais kev kho kom zoo (Ac3 + 30 ℃) kom ntseeg tau tias cov nplej loj ntawm qib 5-8. 20 steel tuaj yeem raug kho los yog ua kom zoo, thiab cov txheej txheem tswj tau xoob heev.
Kev kuaj tsis muaj kev puas tsuaj
20G yuav tsum tau kuaj xyuas tus kheej ultrasonic qhov tsis zoo thiab kev ntsuas tam sim no rau txhua daim, thaum 20G steel feem ntau tsuas yog xav tau kev kuaj xyuas.
Kev sib piv ntawm daim ntawv thov scenarios
20 G: Fais fab chaw nres tsheb boilers (dej-txias phab ntsa, superheaters), tshuaj high-pressure reactors (scenarios nrog tsim kub> 350 ℃)
20 steel: Tube bundles rau cua sov rauv hauv refineries, pipelines rau atmospheric thiab nqus distillation units (kub feem ntau <350 ℃)
Daim ntawv pov thawj yuav tsum tau
20G steel kav yuav tsum tau txais Daim Ntawv Tso Cai Siv Khoom Tshwj Xeeb (TS daim ntawv pov thawj), thiab txhua batch yuav tsum muab cov ntawv qhia txog kev ntsuas kub. 20 steel tsuas yog xav tau daim ntawv pov thawj zoo li niaj zaus.
Cov lus qhia xaiv:
Thaum nws los txog rau ASME lossis PED cov ntawv pov thawj cov haujlwm, 20G tuaj yeem ua raws liSA-106B/ ASTM A192, thaum 20 steel tsis muaj kev sib txuas ncaj qha rau Asmeskas cov ntaub ntawv txheem.
Rau kev ua haujlwm siab tshaj 540 ℃, alloy steels xws li 12Cr1MoVG yuav tsum tau txiav txim siab. Qhov siab tshaj ntawm qhov ntsuas kub rau 20G yog 480 ℃ (qhov tseem ceeb ntawm graphitization ntawm carbon hlau).
Post lub sij hawm: May-23-2025
