ASMESA213S30432 steel yog austenitic hnav-resistant phaj nrog ntau dua oxidation tsis kam thiab lub zog tau los ntawm Nyiv lub Sumitomo Hlau Co., Ltd. thiab Mitsubishi Heavy Industries raws li TP304H los ntawm kev txo Mn thiab ntxiv tooj liab, niobium thiab nitrogen. Nws yog tsim rau tsim ultra-supercritical boilers. Nws yog ib qho ntawm cov khoom nyiam tshaj plaws rau superheater thiab reheater raj thiab yog siv dav hauv USC units. Txoj haujlwm no ua rau kev sim kawm txog hom, hom, kev faib tawm, thiab ntau npaum li cas ntawm martensite tsim los ntawm kev hloov pauv theem tom qab kev kub ntxhov siab ntawm S30432 austenitic hnav-resistant phaj, thiab tshuaj xyuas cov qauv ntawm martensite ntawm cov khoom sib nqus ntawm S30432 steel. .
Cov khoom siv sim yog S30432 hnav-resistant phaj coiled raj (kev qhia tshwj xeeb: Φ44.5mm × 9mm) ua los ntawm kev kho cua sov txheem. Cov tshuaj muaj pes tsawg leeg (mass feem, %) ntawm cov qauv yog: C0.09, Si0.27, Mn0.82, S{{19 }}. {{21}005, P0.009, Cr18.57, Ni8.60, N0.07, Nb0.38, Al0.013, B0.014, Cu2.78. Cov qauv kev laus yog qhov kub-kub superheater raj ntawm 1000MW boiler. Lub sijhawm laus yog 1.9 × 104h. Qhov kub thiab siab ntawm chav nyob hauv cov raj laus yog 650 degree thiab 51MPa feem.
Lub Smartlab high-resolution X-ray diffractometer (XRD) tau siv los xyuas kom meej tias puas muaj cov theem martensite hauv cov qauv tshiab thiab cov qauv ntsuas kub siab, thiab cov qauv K tus nqi tau siv rau kev tsom xam ib nrab. Ib qho Quanta400HV scanning electron microscope (SEM) thiab JEM2010 kis tau tus mob electron microscope (TEM) tau siv. ) rau kev soj ntsuam morphological, TEM rau electron diffraction tsom xam los txiav txim theem martensitic, TEM band zog spectrometer (EDS) rau micro-component tsom xam, thiab AztecEDS + EBSD hom electron backscatter diffraction (EBSD) rau theem qauv ntsuas. Thiab ntau npaum li cas, VersaLab kev ntsuas lub cev kev ntsuas lub cev (VSM) tau siv rau kev ntsuas ntsuas qhov sib nqus, thiab kev rho tawm carbide ntawm cov ntsuas kub kub kub tau ua los ntawm electrolysis.
Cov txiaj ntsig qhia:
(1) Tom qab S30432 austenitic hnav-resistant phaj yog hnub nyoog ntawm 650 degree /51MPa/19, 000 teev, '-martensite tshwm nyob rau hauv cov qauv, uas yog nyob rau hauv lub chromium-tsis zoo cheeb tsam tam sim ntawd nyob ib sab ntawm lub grain ciam teb cheeb tsam, thiab lub substructure yog high-density. yuam kev.
(2) Lub depletion ntawm chromium nyob rau hauv S30432 high-temperature stress-aging qauv nyob ze ntawm lub grain ciam induces martensitic transformation.
(3) Cov carbides nyob rau hauv S30432 high-temperature stress-aging qauv yog sib nqus, nrog ib tug nqi ntawm 0.234emu/g (thaum lub sab nraud magnetic teb zog yog 1000Oe); martensite thiab carbides sib koom ua ke ua rau cov hlau nplaum ntawm qhov kub thiab txias aging S30432, ntawm cov qub nyiaj rau qhov tseem ceeb.
