Qhov twg zoo dua, 18-10 Los yog 316 Stainless Hlau?

Martensitic Stainless hlau:Cov hlau no, zoo li Hom 410 thiab 17-4 PH, paub txog lawv lub zog tensile siab thiab hardness. Lawv ua tiav lub zog no los ntawm kev kho cua sov txheej txheem. Txawm li cas los xij, lawv feem ntau tsis tshua muaj kev tiv thaiv zoo dua li cov hlau austenitic xws li 304 thiab 316. Lawv feem ntau siv rau hauv cov ntawv thov kom muaj zog thiab hnav tsis kam, xws li cutlery, gears, thiab shafts.

Precipitation-hardening Stainless hlau:Cov hlau no, zoo li 17-4 PH (hais ua ntej), nce lawv lub zog los ntawm cov txheej txheem hu ua nag lossis daus hardening. Qhov no tso cai rau lawv kom muaj zog thaum tseem muaj kev tiv thaiv corrosion. Lawv tau siv rau hauv cov ntawv thov kev ua haujlwm siab xws li cov khoom siv hauv aerospace, fasteners, thiab golf clubs.

High-Nitrogen Stainless hlau:Cov hlau no, zoo li Hom 201 thiab UNS S32300, ua tiav lub zog siab los ntawm kev sib ntxiv ntawm nitrogen. Lawv muaj qhov sib npaug zoo ntawm lub zog, kev tiv thaiv corrosion, thiab kev pheej yig piv rau lwm cov kev xaiv muaj zog. Lawv yog siv nyob rau hauv daim ntawv thov xws li automotive qhov chaw thiab cov ntaub ntawv siv.

Nov yog qee yam uas yuav tsum xav txog thaum xaiv cov hlau tsis muaj zog siab:

• Hom lub zog xav tau: Puas yog lub zog tensile, lub zog tawm los, lossis hardness tseem ceeb tshaj?
• Corrosion kuj yuav tsum tau: Nws tseem ceeb npaum li cas rau cov hlau los tiv thaiv corrosion?
• Formability thiab weldability: Cov hlau puas yuav tsum tau zoo li tus lossis welded? (Martensitic steels tuaj yeem nyuaj rau kev tsim thiab vuam.)
• Tus nqi: High-strength stainless hlau tuaj yeem kim dua li lwm hom.

Los ntawm kev txiav txim siab txog cov xwm txheej no, koj tuaj yeem xaiv cov qib zoo tshaj plaws ntawm cov hlau tsis muaj steel rau lub zog tshwj xeeb ntawm koj daim ntawv thov.

316 stainless hlau yog kim dua li lwm hom, xws li 304 stainless hlau, vim muaj ntau yam:

Cov ntsiab lus siab dua Alloy:316 stainless hlau muaj cov ntsiab lus ntxiv piv rau 304. Qhov tshwj xeeb tshaj yog, nws muaj 2-3% molybdenum, uas yog kim dua li chromium thiab npib tsib xee pom nyob rau hauv ob qib. Molybdenum txhim khu cov khoom tiv thaiv pitting corrosion, tshwj xeeb tshaj yog los ntawm chlorides (xws li dej ntsev).

Cov txheej txheem tsim khoom ntau dua:Lub xub ntiag ntawm molybdenum nyob rau hauv 316 stainless hlau yuav tsum tau hloov kho thaum lub sij hawm lub steelmaking txheej txheem los xyuas kom meej kev faib ntawm lub caij thiab ua kom tiav cov khoom uas xav tau. Qhov no tuaj yeem ntxiv qhov nyuaj thiab muaj peev xwm nce cov nqi tsim khoom.

Kev thov siab dua:316 stainless hlau yog dav siv nyob rau hauv daim ntaub ntawv thov superior corrosion kuj, xws li marine ib puag ncig, tshuaj ua, thiab ua zaub mov. Qhov kev thov siab dua no tuaj yeem ua rau tus nqi siab dua me ntsis piv rau ntau lub hom phiaj hlau zoo li 304.

18-8 thiab 316 yog ob qho tib si xaiv rau hom stainless hlau, tab sis muaj qee qhov sib txawv tseem ceeb ntawm lawv. Ntawm no yog ib qho kev sib cais:

Kev sib xyaw:

18-8:Qhov no yog ib lo lus dav dav hais txog stainless hlau nrog kwv yees li 18% chromium thiab 8% nickel cov ntsiab lus. Nws yog feem ntau sib piv nrog Hom 304 stainless hlau (UNS S30400) raws li American Iron and Steel Institute (AISI) tus qauv tsim qauv.

316:Qhov no yog hais txog ib hom stainless hlau uas muaj qhov sib txawv me ntsis dua li 18-8. Nws feem ntau muaj 16-18% chromium, 10-14% npib tsib xee, thiab ntxiv, 2-3% molybdenum.

Qhov txawv tseem ceeb:

Lub ntsiab sib txawv yog nyob rau hauv lub xub ntiag ntawm molybdenum (Mo) nyob rau hauv 316 stainless hlau. Cov ntsiab lus no txhawb nqa nws txoj kev tiv thaiv corrosion, tshwj xeeb tshaj yog tiv thaiv pitting corrosion tshwm sim los ntawm chlorides (xws li dej ntsev).

Corrosion Resistance:

18-8 (Hom 304):Muaj kev tiv thaiv corrosion zoo tab sis muaj kev cuam tshuam ntau rau pitting corrosion nyob rau hauv ib puag ncig nrog cov ntsiab lus chloride siab.

316:Muab superior corrosion kuj, tshwj xeeb tshaj yog rau chlorides thiab lwm yam tshuaj hnyav. Nws yog qhov kev xaiv zoo tshaj plaws rau thaj chaw marine thiab cov ntawv thov raug rau cov dej ntsev.

Daim ntawv thov:

18-8 (Hom 304):Vim nws zoo formability, weldability, thiab affordability, nws yog dav siv nyob rau hauv ntau yam kev siv uas dav corrosion kuj txaus. Piv txwv muaj xws li cov khoom siv hauv chav ua noj, cov khoom siv, cov vaj tse vaj tse, thiab cov khoom siv tsheb.

316:Nrog nws cov kev tiv thaiv corrosion zoo tshaj, 316 yog qhov zoo tagnrho rau cov ntawv thov xws li cov khoom siv hauv hiav txwv, cov khoom siv tshuaj, cov khoom siv ua zaub mov, thiab lwm qhov chaw uas muaj ntsev lossis tshuaj hnyav.

Tus nqi:

18-8 (Hom 304):Feem ntau tsis tshua kim vim nws yooj yim muaj pes tsawg leeg thiab dav ntau lawm.

316:Me ntsis kim dua vim cov ntsiab lus molybdenum ntxiv thiab muaj peev xwm ua tau ntau txoj kev tsim khoom.

Hauv cov ntsiab lus:

Yog tias koj xav tau kev tiv thaiv corrosion zoo, pheej yig, thiab zoo formability, 18-8 (Hom 304) yog qhov kev xaiv tsim nyog.

Yog hais tias superior corrosion kuj, tshwj xeeb tshaj yog rau chlorides, yog qhov tseem ceeb, 316 stainless hlau yog qhov kev xaiv zoo dua, txawm tias tus nqi siab dua me ntsis.

420 Stainless hlau:

Lub zog:

Siab zog thiab hardness:420 stainless hlau yog martensitic stainless hlau, paub txog nws lub zog tshwj xeeb thiab hardness tom qab kev kho cua sov. Qhov no ua rau nws haum rau hnav-resistant daim ntaub ntawv xws li cutlery, hniav, thiab iav.

Zoo Corrosion Resistance:Txawm hais tias tsis zoo li corrosion resistant li 316, 420 muaj kev tiv thaiv zoo nyob rau hauv ib puag ncig me me.

Nqis peev:420 feem ntau tsis tshua kim tshaj 316 vim nws yooj yim muaj pes tsawg leeg.

Tsis muaj zog:

Lower Corrosion Resistance:Piv nrog rau 316, 420 yog qhov cuam tshuam rau corrosion, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig hnyav nrog chlorides lossis tshuaj muaj zog.

Limited Formability:Vim nws qhov hardness siab, 420 yog qhov nyuaj rau daim ntawv lossis khoov piv rau 316.

Lower Weldability:Vuam 420 yuav tsum muaj cov txheej txheem tshwj xeeb kom tsis txhob tawg.

316 Stainless hlau:

Lub zog:

Superior Corrosion Resistance:316 stainless hlau muaj kev tiv thaiv corrosion zoo heev, tshwj xeeb tshaj yog rau chlorides thiab lwm yam tshuaj hnyav. Qhov no ua rau nws zoo tagnrho rau ib puag ncig marine thiab daim ntawv thov raug dej ntsev.

Zoo Formability thiab Weldability:316 yog ib qho yooj yim rau daim ntawv thiab weld piv rau 420.

Lub zog zoo:Txawm hais tias tsis muaj zog npaum li 420 hauv nws daim ntawv hauv paus, 316 tuaj yeem ua haujlwm hnyav kom ua tiav qib zog zoo.

Tsis muaj zog:

Lub zog qis (piv rau hardened 420):Nyob rau hauv nws lub hauv paus daim ntawv, 316 yog tsis muaj zog los yog nyuaj li kub-kho 420 stainless hlau.

Tus nqi siab dua:Vim muaj cov ntsiab lus molybdenum ntxiv thiab muaj peev xwm ua tau ntau txoj kev tsim khoom, 316 feem ntau kim dua 420.

Yog lawm, 304 stainless hlau feem ntau suav hais tias zoo dua rau kev ua haujlwm piv rau 316 stainless hlau. Nov yog vim li cas:

Machineability:

304:Vim nws qis chromium thiab npib tsib xee cov ntsiab lus piv rau 316, 304 muaj kev ua haujlwm zoo dua. Nws muaj ntau yam zoo:

Ib qho yooj yim chip tsim:304 ua kom luv dua, tswj tau ntau dua chips thaum lub sijhawm ua haujlwm, ua rau kev txiav smoother thiab cov cuab yeej siv tsawg dua.

Lower ua hauj lwm hardening:304 ua hauj lwm hardens tsawg dua thaum lub sij hawm machining, txhais tau tias nws yuav tsum tau tsawg zog txiav los ntawm cov khoom, txo lub zog noj thiab ncua lub neej ntawm lub cuab tam.

Zuag qhia tag nrho sai machining:Kev sib xyaw ua ke ntawm kev tsim cov chips yooj yim dua thiab ua haujlwm qis dua tso cai rau kev ua haujlwm nrawm dua thiab txhim kho kev ua haujlwm.

Cov kev xav tau ntawm daim ntawv thov:Yog tias lub tshuab ua haujlwm xav tau kev tiv thaiv corrosion zoo dua (tshwj xeeb tshaj yog rau cov tshuaj chlorides), ces 316 yuav tsim nyog txawm tias muaj kev sib tw machining.

Machinist kev paub:Cov kws tshaj lij tshuab tshuab feem ntau tuaj yeem ua haujlwm nrog 316 zoo siv cov txheej txheem tsim nyog thiab cov cuab yeej siv.