Ntawm ntau qib muaj,17-4 PHNthiab 316 yog ob qho tib si cais ua stainless hlau; lawv muaj cov yam ntxwv sib txawv. Phau ntawv qhia no muab cov kws tshaj lij, lub hom phiaj sib piv.
Qhov Tseem Ceeb Metallurgical Difference
316 stainless hlau yog qib austenitic. Cov qauv no, ua tiav los ntawm alloying nrog npib tsib xee thiab molybdenum, muab zoo heev toughness, ductility, thiab tsis yog -magnetic zog.
Hauv qhov sib piv, 17-4 PH stainless hlau, tseem hu ua UNS S17400 lossis ASTM A564 Hom 630, yog nag lossis daus-hardening martensitic alloy. Nws yog muab rau hauv ib qho kev daws teeb meem- kho mob uas tso cai rau nws tom qab kub-kho kom ua tiav qib siab zog, hloov mus rau cov qauv martensitic.
Tshuaj muaj pes tsawg leeg
316 Stainless Hlau: Nws muaj pes tsawg leeg yog sib npaug ntawm Chromium (~ 16-18%), Nickel (~ 10-14%), thiab Molybdenum (2-3%). Cov ntsiab lus npib tsib xee siab stabilizes cov qauv austenitic, thaum molybdenum ho txhim kho corrosion kuj, tshwj xeeb tshaj yog tiv thaiv chlorides thiab pitting.
17-4 PH Stainless Hlau: Nws muaj Chromium (~15-17.5%) thiab Nickel (~ 3-5%), tab sis nws cov ntsiab lus ntxiv yog tooj liab (~ 3-5%) thiab Niobium / Tantalum (~ 0.15-0.45%). Cov ntsiab lus npib tsib xee qis thiab qhov sib ntxiv ntawm tooj liab thiab niobium pab kom lub cim nag lossis daus-tawv tawv thaum laus.
Mechanical Strength thiab Hardness
Qhov no yog thaj tsam ntawm qhov tsis sib xws feem ntau . 17-4 PH muaj qhov zoo tshaj plaws ntawm txhua yam muaj zog thiab hardness. Hauv nws tus qauv H1150-hnub nyoog, nws feem ntau ua tiav lub zog tensile ntawm ib ncig ntawm 1,100 MPa thiab Rockwell C hardness ntawm kwv yees li 32-38 HRC.
Nws tuaj yeem raug cua sov-kho rau ntau yam mob kom ua tiav qhov muaj zog ntau dua, tshaj 1,300 MPa. 316 stainless hlau, hauv nws lub xeev annealed, muaj lub zog nruab nrab, nrog lub zog tensile ntawm 580 MPa thiab Brinell hardness ntawm ~ 150 HB. Nws lub zog tuaj yeem nce ntxiv los ntawm kev ua haujlwm txias, uas txo cov ductility. Rau siab - cov ntawv thov kev ntxhov siab uas xav tau lub zog siab - rau - qhov hnyav piv, 17-4 PH yog qhov kev xaiv tsis sib xws.
Corrosion Resistance Performance
Kev tiv thaiv corrosion tsis yog ib qho khoom ntiag tug thiab yuav tsum tau soj ntsuam los ntawm ib puag ncig. 316 stainless hlau feem ntau muab kev tiv thaiv zoo tshaj plaws, tshwj xeeb tshaj yog tiv thaiv chlorides. Qhov sib ntxiv ntawm 2-}3% molybdenum ho txhim kho nws cov kev tiv thaiv rau pitting thiab crevice corrosion nyob rau hauv ib puag ncig chloride-cov kabmob, xws li cov ntug dej hiav txwv los yog ua cov tshuaj brines. Qhov no ua rau nws tus qauv kev lag luam rau marine thiab ntau yam kev siv tshuaj lom neeg.
17-4 PH muaj kev tiv thaiv corrosion zoo, piv rau cov qauv 304 stainless hlau hauv ntau qhov chaw me me. Txawm li cas los xij, nws qhov kev tiv thaiv rau chloride-induced pitting thiab kev ntxhov siab corrosion tawg yog qhov tseem ceeb qis dua li ntawm 316. Nws qhov zoo yog nyob rau hauv kev tswj kom zoo corrosion kuj ntawm nws cov qib siab heev, qhov sib npaug tsis tuaj yeem nrog cov qib austenitic.
Fabrication thiab Machinability
Cov txheej txheem tsim khoom tsim nyog rau txhua qhov sib txawv ntawm qhov sib txawv . 316 stainless hlau yog lub npe nrov rau nws cov formability zoo heev thiab weldability. Nws cov ductility siab tso cai rau kev khoov hnyav, kos duab, thiab spinning. Nws welds tau yooj yim siv cov txheej txheem arc vuam nrog 316L muab tub lim hlau, thiab cov vuam tuav tau zoo corrosion kuj thiab ductility.
17-4 PH nthuav tawm ntau qhov kev sib tw fabrication tab sis muaj kev ua haujlwm zoo heev. Nws formability nyob rau hauv lub annealed mob yog ncaj ncees tab sis yuav tsum tau ntau zog tshaj 316. Vuam yuav tsum tau ceev faj txheej txheem; nws yog feem ntau welded nyob rau hauv cov kev daws teeb meem -annealed mob thiab yuav tsum tau re- laus ncej-weld kom rov qab tag nrho lub zog thiab corrosion kuj nyob rau hauv lub tshav kub-cuam tshuam cheeb tsam.
Txawm li cas los xij, hauv nws lub xeev annealed, 17-4 PH tshuab zoo nkauj, ua cov chips luv luv thiab tso cai rau kev txiav nrawm, uas yog qhov zoo tshaj plaws rau cov khoom siv tig los yog milled.
Sib nqus teb
Qhov no yog ib tug tswv yim, tam sim no sib txawv. Vim nws cov qauv austenitic, 316 stainless hlau yog qhov tseem ceeb tsis yog -magnetic hauv lub xeev annealed. Cov hlau nplaum me me tuaj yeem raug ntxias los ntawm kev ua haujlwm txias.
Cov qauv martensitic ntawm 17-4 PH yog sib nqus nyob rau hauv txhua qhov kev kho cua sov. Cov cuab yeej no tseem ceeb heev rau cov ntawv thov siv hluav taws xob, cov khoom siv MRI, lossis qhov chaw sib nqus permeability yuav tsum zam.
Thawj Daim Ntawv Thov Domains
316 stainless hlau yog lub chaw ua haujlwm ntawm kev pabcuam corrosive. Nws cov ntawv thov tseem ceeb suav nrog cov khoom siv hauv hiav txwv, cov khoom siv tshuaj lom neeg, cov khoom siv tshuaj thiab cov khoom noj, cov khoom siv phais mob, thiab cov khoom siv vaj tsev nyob hauv cov ntug dej hiav txwv.
17-4 PH ua tau zoo nyob rau hauv lub zog siab, cov khoom muaj tseeb. Nws yog cov khoom xaiv rau aerospace fittings, zog, ncej, li qub, twj tso kua mis, nuclear pov tseg casks, thiab oilfield Cheebtsam uas siab zog, zoo corrosion kuj, thiab zoo heev machinability yuav tsum tau.
Nqi
316 feem ntau hais kom tus nqi siab dua vim nws cov qib siab ntawm cov npib tsib xee thiab molybdenum, uas yog cov khoom siv alloying kim heev. Qhov no tuaj yeem ua rau nws 20-30% kim dua 17-4 PH, nyob ntawm kev hloov pauv ntawm kev lag luam thiab daim ntawv.
Yog tias koj tab tom nrhiav stainless hlau yeeb nkab fittings los yog xav tau tswv yim rau koj qhov project, xav tias dawb rauncav cuag peb.
