Thaum koj hnov '2Cr13 stainless hlau', qhov kev xav tam sim rau ntau tus tsuas yog lwm qib martensitic, zoo rau riam thiab pheej yig li qub. Qhov ntawd tsis yog qhov yuam kev, tab sis nws yog ib qho yooj yim uas ua rau ntau lub khw hauv pem teb mob taub hau dua li qhov nws yuav tsum tau ua. Qhov tseeb yog, nws tus cwj pwm zaum hauv nruab nrab qhov tsis yooj yim no - nws tsis yog kev zam txim li 304, los yog tsis muaj zog li 440C. Tau txais txiaj ntsig zoo ib yam nrog nws, tshwj xeeb tshaj yog nyob rau hauv casting thiab machining, xav kom koj hwm nws cov quirks tshwj xeeb.
Lub Casting Conundrum: Fluidity vs. Cracking
Nyob rau hauv peb lub plhaub pwm thiab peev casting kab, 2Cr13 yog ib tug nquag flyer rau lub twj tso kua mis lub cev, impellers, thiab tej yam khoom noj machinery qhov chaw. Thawj nuance yog pouring kub. Koj yuav xav nrog nws cov pa roj carbon nruab nrab (~ 0.16-0.25%) thiab 13% Cr, nws ncaj nraim. Tab sis nws cov solidification ntau yog nqaim dua li koj xav tau. Ncuav txias heev, thiab koj tau txais mistruns, tshwj xeeb tshaj yog nyob rau hauv nyias seem ntawm lub impeller hniav. Ncuav kub dhau, thiab muaj kev pheej hmoo ntawm kub tearing spikes, tshwj xeeb tshaj yog nyob ib ncig ntawm cov ntse sab hauv ntawm lub cev valve. Peb tau kawm, dhau los ntawm ntau tshaj li ob peb cov khoom pov tseg, txhawm rau txhawm rau qhov siab dua qhov kawg ntawm qhov kev pom zoo tab sis nrog kev tswj hwm nruj dua. Nws yog hais txog muab nws txaus fluidity los sau cov pwm yam tsis muaj kev ntxhov siab ntau dhau ntawm lub plhaub solidifying.
Tom qab ntawd muaj cov khoom pwm sib cuam tshuam. Vim nws yog martensitic, nws transforms thiab shrinks txawv tshaj austenitic qib. Nrog peev casting siv ceramic shells, peb yuav tsum tau kho lub plhaub ua ntej kub kub. Tus qauv ua ntej cua sov rau 304 ua rau tawg hauv 2Cr13 castings vim tias lub thermal shock thaum lub sij hawm nchuav yog hnyav dua. Peb tam sim no pre-rhuab me ntsis siab dua, uas zoo li counterintuitive rau txo shrinkage kev nyuaj siab, tab sis nws ua hauj lwm. Nws maj mam pib qhov cua txias kom txaus kom cia cov tawv nqaij ntawm daim tawv nqaij ntau uniformly.
Tom qab-casting tshav kub kev kho mob yog tsis-negotiable. As-cast 2Cr13 yog nkig. Koj yuav tsum anneal nws. Cov txheej txheem txheej txheem yog cua sov rau ib ncig ntawm 850-900 ° C, tuav, thiab cua txias. Tab sis ntawm no yog cov tswv yim tswv yim: qhov cua txias hauv qhov cub tseem ceeb. Peb ib zaug muaj batch ntawm cam khwb cia casings uas dhau hardness check tab sis machined tsis zoo, uas qhia cov cuab yeej siv ntau dhau. Qhov teeb meem taug qab rov qab mus rau lub qhov cub ntau dhau qhov chaw nyob hauv qhov chaw txias txias heev, yuav luag zoo li lub subcritical anneal, tawm hauv microstructure tsawg dua qhov zoo tagnrho. Tam sim no peb xyuas kom zoo dua qhov sib nrug. Nws yog cov txheej txheem me me deviations uas tom koj.
Machinability: Lub Gummy Reality
Nyob rau hauv daim ntawv, nws machinability ntsuam xyuas yog ok. Nyob rau hauv pem teb CNC, cov neeg ua haujlwm yuav qhia rau koj tias nws tuaj yeem ua gummy lossis stringy, tshwj xeeb tshaj yog nyob rau hauv annealed mob. Nws tsis cuam tshuam cov chips huv si zoo li 12L14 steel, thiab nws tsis huv-txiav li 303 stainless. Qhov tseem ceeb yog tswj kev ua haujlwm hardening. Yog tias koj tus nqi pub tsawg dhau los lossis lub cuab yeej nyob twj ywm, koj tam sim ua haujlwm-hnyav rau saum npoo, thiab tom ntej no dhau chatters lossis hlawv lub cuab yeej. Peb qhia meej cov cuab yeej carbide nrog lub ntsej muag ntse, polished rake thiab siv cov nqi pub ntau dua nrog kev nrawm nrawm. Coolant yog qhov tseem ceeb, tsis yog tsuas yog ua kom txias tab sis pab ntxuav cov chips tenacious.
Drilling qhov tob yog ib qho kev sib tw tshwj xeeb. Tus qauv 118-degree taw tes tuaj yeem taug kev thiab ua rau kub dhau. Peb hloov mus rau 135-degree split-point xyaum nrog lub voj voog qeeb qeeb thiab ua kom txias txias. Nws ntxiv lub sij hawm voj voog tab sis tshem tawm ntau qhov kev rov ua haujlwm thiab cov cuab yeej tawg. Rau ib lub tuam txhab xws li Qingdao Qiangsenyuan Technology Co., Ltd. (QSY), uas tuav txhua yam ntawm casting mus kawg CNC machining nyob rau hauv ib lub ru tsev, cov kev kawm sib xyaw no yog qhov tseem ceeb heev. Koj tsis tuaj yeem optimize machining hauv kev sib cais; koj yuav tsum suav rau qhov xwm txheej zoo li-cam khwb cia thiab kev kho cua sov keeb kwm ntawm qhov khoob. Ib feem uas tau annealed me ntsis off-spec yuav tawm tsam koj ntawm lub tshuab dhos txhua hnub.
Kuv nco qab ib qhov project rau ib tug series ntawm hydraulic valve spools. Cov ntawv luam tau hu kom ua tiav qhov zoo ntawm cov av. Tig 2Cr13 rau qhov ua tiav yog qhov teeb meem - peb tau txais ib qho torn, smeared zoo nkauj. Peb tau sim nrog sib txawv geometries thiab thaum kawg pom tias ib tug wiper-style insert nrog lub teeb heev kawg tiav dhau, siv ib tug tshwj xeeb high-lubricity txiav kua (tsis yog peb tus qauv coolant), ua kom yuam kev. Nws tsis yog nyob rau hauv tus txheej txheem machining phau ntawv; nws yog lub khw-hauv pem teb kho yug los ntawm kev ntxhov siab.
Corrosion Resistance: Teem Txoj Kev Cia Siab
Qhov no yog qhov uas cov neeg siv khoom tsis ntseeg yog qhov loj tshaj. Cov neeg pom stainless hlau thiab xav tias nws yog xeb-pov thawj. 2Cr13 stainless hlau muaj tsuas yog nruab nrab corrosion kuj. Nws yog qhov zoo rau ib puag ncig corrosive me ntsis, xws li qee cov zaub mov acids lossis atmospheric raug, tab sis nws yuav pit nyob rau hauv chloride-nplua nuj chaw (kua ntses, hnyav txoj kev ntsev). Peb ib txwm muaj qhov kev sib tham no nrog cov neeg siv khoom. Rau cov khoom siv marine, peb yuav thawb rau 316L. Tab sis rau, hais tias, lub tshuab bakery ib feem raug rau khob noom cookie acids thiab chav, 2Cr13 yog tus nqi-zoo thiab zoo kawg nkaus txaus.
Passivation pab, tab sis nws tsis yog ib qho txuj ci kho mob. Cov txheej txheem rau qib martensitic zoo li qhov no txawv ntawm nitric acid da dej siv rau austenitics. Peb siv cov txheej txheem citric acid-based passivation, uas muaj txiaj ntsig zoo thiab zoo ib puag ncig. Txawm li cas los xij, nws txoj kev vam meej yog nyob ntawm qhov chaw ua kom huv si ua ntej da dej. Txhua yam embedded hlau los ntawm machining los yog tuav yuav cuam tshuam lub passive txheej. Peb tau ua raws li kev tu thiab tshuaj xyuas cov kauj ruam ua ntej passivation, uas txo qis qhov tsis txaus ntseeg ntawm qhov chaw ua tiav.
Lub xeev kev kho cua sov ncaj qha cuam tshuam rau kev ua haujlwm corrosion. Ib qho tempered zoo yuav muaj kev tiv thaiv zoo dua li ib qho uas tsuas yog kev ntxhov siab xwb. Peb tau sau cov ntaub ntawv no los ntawm kev sim cov qauv los ntawm cov khoom sib txawv hauv lub txee ntsev ntsev. Cov ntaub ntawv tau pab peb ua pov thawj peb cov txheej txheem kho cua sov tag nrho rau cov neeg siv khoom uas tau sim ua kom muaj nuj nqis-tus kws tshaj lij uas tawm mus. Hla kev kho cua sov kom txuag tau tus nqi feem ntau rov qab tom qab nrog kev ua haujlwm tsis ua haujlwm.
Vuam thiab Fabrication: Ua nrog ceev faj
Nws yog weldable, tab sis nws tsis yog phooj ywg. Pre-heat yog xav paub ntau ntxiv, nyob ib ncig ntawm 200-300 ° C, thiab tom qab vuam cua sov kho (PWHT) yuav luag ib txwm tsim nyog los rov qab ductility thiab corrosion kuj nyob rau hauv tshav kub-tshem tawm tsam (HAZ). Yog tias koj hla PWHT, HAZ yuav nyuaj, nkig, thiab nquag tawg. Peb tau kawm qhov no thaum ntxov ntawm kev kho cov tawg tawg. Kev kho vuam yam tsis muaj cua sov ua ntej thiab PWHT feem ntau tsuas yog tawg dua ob peb millimeters deb ntawm cov hlaws vuam.
Rau fabrication ntawm welded lug ntawm phaj los yog bar, muab tub lim xaiv yog ib qho tseem ceeb. Cov kev xaiv feem ntau yog 309L lossis 312 stainless hlau electrodes, uas muaj cov ntsiab lus alloy siab dua los them nyiaj rau dilution thiab tiv thaiv cov tawv tawv ntau dhau. Txawm li ntawd los, tswj qhov kub ntawm qhov sib txawv yog qhov tseem ceeb. Peb kho nws zoo li vuam cov hlau tsis tshua muaj hlau ntau dua li cov hlau tsis muaj steel. Kev xav hloov pauv yog qhov tseem ceeb.
Ib qho kev sim ua tsis tiav koom nrog tus neeg siv khoom xav tau kev sib dhos ntawm 2Cr13 daim hlau thiab cam khwb cia fittings. Lawv tau hais kom tsis muaj PWHT vim qhov kev txhawj xeeb ntawm qhov ruaj khov. Peb ceeb toom tawm tsam nws tab sis tau ua raws li lawv qhov kev thov. Cov khoom tau dhau los kuaj thawj zaug tab sis tawg hauv kev thauj mus los thaum lub caij ntuj no txias. Cov residual stresses los ntawm vuam, ua ke nrog qhov kub-kub embrittlement ntawm untempered martensite nyob rau hauv lub HAZ, ua rau nws. Tam sim no peb yuav tsum tau kos npe zam yog tias tus neeg siv khoom tsis kam pom zoo PWHT. Nws tsis tsim nyog rau kev puas tsuaj rau lub koob npe nrov.
Sourcing thiab Material Consistency: Qhov txawv txawv
Tsis yog tag nrho 2Cr13 yog tsim sib npaug. Qhov sib txawv ntawm cov kab sib txawv xws li sulfur, phosphorus, thiab silicon ntawm cov mills sib txawv tuaj yeem cuam tshuam rau castability thiab machinability. Peb tau tsim peb cov saw hlau ntau npaum li qhov ua tau thiab thov cov ntaub ntawv kuaj xyuas zeb rau cov haujlwm tseem ceeb. Ib pawg nrog leej faj ntawm qhov kawg ntawm qhov spec yuav tshuab tau zoo dua tab sis tuaj yeem ua rau kub tearing thaum lub sij hawm casting.
Ua haujlwm nrog tus khub mus sij hawm ntev nyiam QSY, nrog xyoo caum hauv peev casting thiab machining, highlights tus nqi ntawm no tswj. Peb tuaj yeem taug qab qhov teeb meem machining rov qab mus rau qhov tshwj xeeb kub ntawm cov hlau thiab kho peb cov dej ntws tsis zoo raws li. Piv txwv li, yog hais tias ib tug tshiab batch xav tias nyuaj rau thawj cov cuab yeej tiv tauj, peb yuav xyuas qhov tseeb cov ntsiab lus ntawm cov ntawv pov thawj thiab tej zaum yuav kho qhov kub thiab txias annealing ib tug notch ua ntej peb txawm pib tag nrho cov khoom. Qhov kev tiv thaiv kev tiv thaiv no txuag tons ntawm downtime.
Thaum kawg, nws yog hais txog kev paub thaum tsis siv nws. Nrog nce ntawm tshwj xeeb alloys zoo li super duplex lossis npib tsib xee-raws li rau qhov chaw huab cua, 2Cr13 lub luag haujlwm yog ib qho kev ntseeg siab, kev xaiv nyiaj txiag rau cov ntawv tshwj xeeb, nkag siab zoo. Nws yog ib tug workhorse, tsis yog ib tug showhorse. Nws tus nqi yog nyob rau hauv nws qhov kev kwv yees ua tau zoo nyob rau hauv nws cov kev txwv, thiab cov kev txawj ntse tiag tiag yog nyob rau hauv kev txhais thiab hwm cov kev txwv los ntawm txhua kauj ruam - los ntawm lub qhov cub qhov cub mus rau qhov kawg QC check. Qhov ntawd yog qhov 30 xyoo ntawm kev paub ntawm lub tuam txhab zoo li peb tau hais tiag tiag.
