Standard martensitic stainless hlau yog: 410, 414, 416, 416 (Se), 420, 431, 440A, 440B thiab 440C, uas yog sib nqus; corrosion kuj ntawm cov hlau no los ntawm "chromium", uas nyob ntawm 11.5 mus rau 18%. Qhov siab dua cov ntsiab lus ntawm chromium, qhov siab dua cov ntsiab lus ntawm cov pa roj carbon monoxide yuav tsum tau ua kom ntseeg tau tias qhov tsim ntawm martensite thaum kho cua sov. Cov saum toj no peb 440 hom stainless hlau tsis tshua pom zoo rau cov ntawv thov uas xav tau vuam, thiab cov hlau muab tub lim ntawm 440 muaj pes tsawg leeg tsis yooj yim kom tau txais.
Kev txhim kho rau cov qauv martensitic steels muaj cov khoom siv ntxiv xws li npib tsib xee, molybdenum, vanadium, thiab lwm yam, feem ntau yog siv los ua kom muaj qhov txwv tsis pub khiav hauj lwm kub ntawm cov qauv hlau mus rau saum 1100K. Thaum cov ntsiab lus no ntxiv, cov ntsiab lus carbon kuj nce ntxiv. Raws li cov ntsiab lus carbon nce, qhov teeb meem ntawm kev tsis txhob tawg nyob rau hauv lub hardened tshav kub-cuam tshuam cheeb tsam ntawm lub weld yuav hnyav dua.
Martensitic stainless hlau tuaj yeem welded nyob rau hauv lub annealed, hardened thiab tempered xeev. Txawm li cas los xij ntawm lub xeev qub ntawm cov hlau, ib qho chaw martensitic hardened yuav raug tsim nyob ib sab ntawm lub vuam tom qab vuam. Lub hardness ntawm lub tshav kub-cuam tshuam cheeb tsam feem ntau yog nyob ntawm cov ntsiab lus carbon ntawm niam txiv hlau. Raws li lub hardness nce, lub toughness yuav txo, thiab qhov chaw no yuav ua rau kom tawg. Preheating thiab tswj qhov kub ntawm interlayer yog txoj hauv kev zoo tshaj plaws kom tsis txhob tawg. Txhawm rau kom tau txais cov khoom zoo tshaj plaws, kev kho cua sov tom qab vuam yog xav tau.
ASME SA268 TP410 Siab Siab Tube
