Cov yam ntxwv thiab kev siv ntawm C350 stainless hlau 18Ni maraging steel:
Tus neeg sawv cev qib steel rau 18Ni steel muaj xws li 022Ni18Co8Mo3TiA [18Ni (200)], 022Ni18Co8Mo5TiA [18Ni (250)], 022Ni18Co9Mo5TiA [103NiA [103]Ni8, thiab i (350)] hlau.
18Ni steel yog ib hom maraging steel nrog cov ntsiab lus qis carbon. Cov ntsiab lus alloy uas ua lub luag haujlwm hauv lub hnub nyoog hardening yog Ti, Al, Co thiab Mo. Impurities muaj kev cuam tshuam zoo rau cov khoom ntawm martensite hnub nyoog hardening steel, thiab cov nyhuv ntawm cov hlau uas muaj zog ntau zog yog pom tseeb dua. Qhov no yuav tsum tau cov hlau no kom dhau lub tshuab nqus tsev smelting kom txo cov impurities, cais, thiab roj cov ntsiab lus nyob rau hauv lub ingot, kom cov hlau muaj zoo toughness thiab kev ua tau zoo.
Hauv 18Ni steel, carbon muaj qhov cuam tshuam zoo rau lub zog ntawm cov hlau. Txawm hais tias cov ntsiab lus carbon tsawg heev, lub zog ntawm martensite yuav yog qhov tseem ceeb. Txawm li cas los xij, lub zog ntawm cov hlau yuav raug txo qis tom qab cov pa roj carbon ntau feem ntau nce los ntawm 0.03 feem pua , yog li cov pa roj carbon ntau feem hauv 18Ni maraging steel yuav tsum tsis pub tshaj 0.03 feem pua.
S hauv C350 maraging steel yog teeb meem. S muaj nyob rau hauv cov hlau li sulfides thiab muab faib raws li kub dov kev taw qhia, ua rau anisotropy ntawm cov hlau. Yog li ntawd, nws yuav tsum tau txo cov leej faj cov ntsiab lus ntawm cov hlau kom ntau li ntau tau.
Ib tug loj npaum li cas ntawm Ni yog ntxiv rau 18Ni hlau kom tau ib tug martensite tom qab cov khoom tov quenching, thiab cov nyhuv thib ob ntawm Ni ntawm Mo yog tsim kom muaj kev laus zog theem Ni3Mo. Thaum cov feem loj ntawm Ni ntau tshaj 10 feem pua, cov pob txha toughness ntawm maraging steel tuaj yeem txhim kho.
18Ni steel cov ntaub ntawv ultra-low carbon martensite tom qab cov tshuaj tov, nrog hardness ntawm 28 ~ 30HRC; Tom qab kev laus kev kho mob, vim los nag los ntawm ntau hom intermetallic tebchaw, aging hardening tuaj yeem ua tiav, thiab hardness tuaj yeem nce mus rau 50HRC. Hom hlau no tseem muaj qhov zoo toughness thiab siab tawg toughness nyob rau hauv siab zog thiab toughness tej yam kev mob. Nyob rau tib lub sijhawm, hom hlau no tsis muaj kev ua haujlwm txias txias, me me deformation thaum laus kho cua sov, zoo weldability, thiab saum npoo kuj tuaj yeem raug nitrided.
18Ni low-carbon maraging steel feem ntau yog siv los tsim cov khoom siv kho tshuab thiab cov pwm yas nrog kev ua haujlwm siab, ultra daim iav nto, kab noj hniav nyuaj, ntu ntu loj thiab ntau lawm, tab sis nws siv yog txwv vim nws tus nqi siab.
