347 vs 347H Austenitic Stainless Steels: Stabilized vs High-Carbon High-Temp Qib

 

Dab tsi yog lawv cov ntsiab lus tseem ceeb thiab kev ua haujlwm sib txawv?

347 muaj 17–19% Cr, 9–13% Ni, 0.7–1.0% Nb, Tsawg dua lossis sib npaug li 0.08% C. Nws tswj kev ruaj khov mus txog 800 degree, zoo tagnrho rau kev siab dav -heat welded qhov chaw.347H muaj tib yam Cr/Ni/Nb4 cov ntsiab lus ntau dua 0.0% C. niobium carbides, boosting creep resistance ntawm 800-900℃(tseem ceeb rau chav turbine Cheebtsam). Ob leeg tshem tawm tom qab{18}}weld kev kho cua sov, ib qho tseem ceeb kom zoo dua cov uas tsis yog{19}}stabilized qib.

Lawv qhov siab -kub muaj peev xwm txawv li cas?

347 ua tau zoo nyob rau hauv nruab nrab siab -cov kev pab cuam cua sov (xws li, muaj rauv taws tais, tso headers) tab sis softens saum toj no 800℃.347H cov ntsiab lus ntau dua cov pa roj carbon ntau resists creep deformation ntawm 800-900 degree, ua rau nws yog qhov zoo tshaj plaws xaiv rau nuclear fais fab nroj tsuag chav kab thiab roj turbine combustion chambers.

Nyob rau hauv daim ntawv thov twg yog ib qib irreplaceable?

Xaiv 347 rau qhov siab tshaj -cov cua kub welded sib dhos (tsawg dua los yog sib npaug li 800 degree): cov hlab boiler, tshuaj reactor internals.Opt rau 347H rau ultra-siab- kub, siab - kev pabcuam siab: nuclear steam generators, aircraft engine exhaust Cheebtsam.

Tus nqi thiab kev tsim khoom lag luam yog dab tsi- tawm?

347H tus nqi 5-8% ntau dua 347 (nrog kev tswj cov pa roj carbon ntau ntxiv), yog li nws tsuas yog siv rau 800+℃daim ntawv thov.Ob lub vuam zoo nrog 347 muab tub lim hlau, tab sis 347H yuav tsum nruj dua cov cua sov input tswj kom tsis txhob carbide coarsening.

Cov txheej txheem tseem ceeb yog dab tsi?

347 dhau lawm -tshwj xeeb rau qis- kub siv- siv 321 lossis 304H kom txuag nqi.347H tsis tsim nyog rau qis- qhov kub thiab txias corrosive sib dhos- nws cov pa roj carbon ntau dua ua rau muaj kev pheej hmoo siab tsis muaj cua sov.