400 series stainless hlau yog ib qho alloy ntawm hlau, carbon thiab chromium.
Vim nws tsis muaj npib tsib xee, nws yog nickel-txuag stainless hlau, tseem hu ua stainless hlau. 400 series stainless hlau muaj cov qauv martensitic thiab cov khoom hlau, uas tsis yog tsuas yog muaj cov khoom sib nqus ib txwm muaj, tab sis kuj muaj zog tiv taus kub oxidation. Piv nrog cov pa roj carbon steel, nws lub cev thiab cov khoom siv kho tshuab tau zoo dua ntxiv. Thiab feem ntau 400 series stainless hlau tuaj yeem kho cua sov.
1. Kev sib xyaw thiab cov yam ntxwv
Feem ntau siv 400 series stainless hlau ntau yam yog 430, 410, 420, 409L, thiab lwm yam, ntawm 430 stainless hlau yog siv tshaj plaws. Cov ntsiab lus chromium ntawm 430 stainless hlau yog 18 feem pua, uas yog tus cwj pwm los ntawm tus nqi qis, me me thermal expansion coefficient, thiab chloride kev nyuaj siab corrosion kuj zoo dua 300 series stainless hlau ntau yam; Tab sis nws cov shortcomings kuj pom tseeb: formability, weldability thiab tensile zog. Nws yog me dua li 300 series stainless hlau qauv, yog li nws qhov kev siv yog txwv. Cov ntsiab lus chromium ntawm 410 thiab 420 stainless hlau yog 13 feem pua, thiab lawv lub ntsiab feature yog siab hardness. 400 series stainless hlau muaj tib yam corrosion kuj zoo li 300 series stainless hlau hauv oxidizing media xws li cua, dej tshiab thiab nitric acid nyob rau hauv tib cov ntsiab lus chromium, thiab zoo dua 200 series stainless hlau. Ntxiv cov lej ntawm niobium, titanium, tooj liab, txhuas thiab lwm yam tuaj yeem txhim kho nws qhov kev ua tau zoo sib sib zog nqus, weldability, corrosion kuj thiab kub lub zog, thiab tuaj yeem hloov ib nrab ntawm 300 series stainless hlau.
2. Kev faib tawm ntawm hom hlau
Peb paub tias raws li cov qauv metallographic sib txawv, stainless hlau tuaj yeem muab faib ua peb hom: ferrite, martensite thiab austenite, thaum 400 series stainless hlau feem ntau yog ferrite thiab martensite.
Ferritic stainless hlau: Cov ntsiab lus chromium feem ntau yog 12 feem pua rau 30 feem pua, feem ntau tsis muaj npib tsib xee, thiab qee zaum nrog me me ntawm Mo, Ti, Nb thiab lwm yam, thiab cov qauv matrix yog ferritic stainless hlau siv. Nws muaj cov yam ntxwv ntawm cov thermal conductivity loj, me me expansion coefficient, zoo oxidation kuj, thiab zoo heev kev nyuaj siab corrosion kuj. Txawm li cas los xij, muaj qhov tsis zoo xws li cov yas tsis zoo, txo qis tom qab vuam plasticity thiab corrosion kuj. Kev siv cov cuab yeej siv hluav taws xob tawm ntawm qhov cub hluav taws xob (AOD lossis VOD) tuaj yeem txo cov ntsiab lus sib txawv xws li carbon thiab nitrogen, ua rau nws siv dav. Feem ntau 400 series stainless hlau qauv yog 430 thiab 409L.
Martensitic stainless hlau: stainless hlau nrog cov ntsiab lus chromium tsis tsawg dua 12 feem pua (feem ntau 12 feem pua rau 18 feem pua), cov ntsiab lus carbon siab, cov qauv martensitic siv, thiab nws cov khoom siv kho tshuab tuaj yeem hloov kho los ntawm kev kho cua sov. Nyob rau hauv layman cov ntsiab lus, nws yog ib hom hardenable stainless hlau. Feem ntau 400 series stainless hlau qauv yog 410, 420, 440, thiab 436L.
3. Scope ntawm daim ntawv thov
400 series stainless hlau muaj ntau yam kev siv. Hauv qab no kuv yuav qhia koj qee yam ntsig txog daim ntawv thov teb. Exhaust yeeb nkab, muffler, tail yeeb nkab, catalytic converter, thiab lwm yam ntawm lub tsheb tso pa system, lub ntsiab steel qib yog 409L, 444, 436L, 439, 441, 429.
Lub tshuab ntxhua khaub ncaws sab hauv, cov qib hlau tseem ceeb yog 439, 430, 430J1
Tableware, chav ua noj dab dej, cov tais diav, cov lauj kaub hauv qab, thiab lwm yam, cov qib steel tseem ceeb yog 430, 420J1, 420J2, 410s.
Cov ntaub ntawv vov tsev, cov qib steel tseem ceeb yog 445 thiab 446M.
Cov ntsiab lus: 400 series stainless hlau nyob hauv tib txoj haujlwm tseem ceeb hauv peb lub neej raws li 200 thiab 300 series stainless hlau, thiab yog ib qho tseem ceeb hauv peb lub neej. Txawm tias huab cua kub los yog txias, lawv yeej ib txwm npaj rau txhua txoj haujlwm nrog lawv lub zog!
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