Kuyini Ukuqinisa Insimbi Engagqwali Yemvula?

Insimbi engagqwali eqinisa imvula, eyaziwa nangokuthi insimbi engagqwali ye-PH, iyisigaba esikhethekile sensimbi engagqwali esithola amandla aphezulu ngenqubo yokwelapha ukushisa ehlukile ebizwa ngokuthi i-precipitation hardening. Le nqubo ithuthukisa izakhiwo zemishini ngaphandle kokubeka engcupheni ukumelana nokugqwala, okwenza izinsimbi ezingagqwali ze-PH zibe yisinqumo esikhethwayo ezimbonini ezidinga kakhulu njengezindiza, i-petrochemical, i-marine, kanye nokuzivikela.

Lolu hlobo lwensimbi engagqwali luhlanganisa ukumelana nokugqwala kwama-austenitic stainless grades namandla nokuqina okungadlula izinsimbi eziningi zekhabhoni ezinamandla aphezulu. Umphumela uba ingxubevange eguquguqukayo enikeza ukuqina, ukusebenza kahle, kanye nokuphila isikhathi eside ezindaweni ezinolaka.

Isimiso Esiyisisekelo Sokuqinisa Imvula

Ukuqina kwemvula kuyindlela yokwelapha ngokushisa esetshenziswa ngensimbi ekhulisa amandla okukhiqiza izinto ezithambile, okuhlanganisa insimbi engagqwali, i-aluminium, kanye ne-alloys esekelwe ku-nickel. Ku-PH stainless steels, le nqubo ihilela izinyathelo ezintathu eziyinhloko:

1. Ukwelashwa Kwesixazululo– Ingxube ishiswa kuze kufike ekushiseni okuphezulu ukuze kuncibilikiswe izinto ezixubayo zibe yisisombululo esiqinile.

2. Ukucima– Ukupholisa okusheshayo kuvala izakhi zokuhlanganisa endaweni yazo, kuvimbele ukwakheka kwezigaba ezingafuneki.

3. Ukuguga (Ukuna kwemvula)– Ukushisa kabusha okulawulwayo kuvumela izinhlayiya ezincane, ezaziwa ngokuthi ama-precipitates, ukuthi zakheke ngaphakathi kwesakhiwo esincane, zivimbele ukunyakaza kokuhlukana nokukhulisa amandla.

Ama-precipitate amancane asebenza njengezithiyo ekuhambeni kokuhlukana, okuthuthukisa kakhulu ubulukhuni kanye namandla okunamathela kwezinto ngenkathi kugcinwa izakhiwo zazo ezingagqwali.

Izinhlobo Ezivamile Zokuqinisa Insimbi Engagqwali

Izinhlobo eziningana zensimbi engagqwali ye-PH ziyatholakala, ngayinye inokwakheka kwayo, izakhiwo zayo zemishini, kanye nezinhlelo zokusebenza. Okuvame kakhulu kufaka phakathi:

• 17-4PH (UNS S17400)– Iqukethe cishe i-17% ye-chromium kanye ne-4% ye-nickel enezengezo zethusi. Inikeza amandla aphezulu, ukuqina okuhle, kanye nokumelana okuhle kakhulu nokugqwala ezimweni eziqinile nezindala.

• 15-5PH (UNS S15500)– Kufana ne-17-4PH kodwa kunokuqina okungcono kanye nezakhiwo ezithuthukisiwe zemishini eguquguqukayo.

• 17-7PH (UNS S17700)– Yaziwa ngokwakheka kwayo okuhle esimweni esifakwe emanzini abandayo kanye namandla aphezulu ngemva kokuqina kwemvula.

• 13-8Mo (UNS S13800)– Inikeza ukuqina okuvelele, ukumelana nokugqwala, kanye namandla aphezulu, okuvame ukusetshenziswa ezimbonini zezindiza kanye nezimboni zenuzi.

Izakhiwo Eziyinhloko Zezinsimbi Ezingagqwali ze-PH

1. Amandla Aphezulu– Ingafinyelela amandla okubamba adlula i-1000 MPa ngemva kokwelashwa ngokushisa.

2. Ukumelana Okuhle Kakhulu Kokugqwala– Ifana nensimbi engagqwali engu-304 noma engu-316 ezindaweni eziningi.

3. Ukuqina Okuhle– Igcina ukumelana nokushayisana ngisho noma isezingeni eliphezulu lokuqina.

4. Ukuqina Okulinganayo– Ukuphambuka okuncane ngesikhathi sokuqina, okwenza kube kufanelekile ezingxenyeni ezinembile.

5. Ukumelana Nokugqoka– Kufanelekela izinhlelo zokusebenza ezikhuhlana futhi ezikhuhlayo.

Inqubo Yokwelapha Ukushisa Ngokuningiliziwe

Inqubo yokwelapha ukushisa kwezinsimbi ezingagqwali ze-PH ingenziwa ngendlela yokuthi kufinyelelwe amazinga athile amandla nokuqina.

1. Isixazululo Sokumboza– Ukushisa kufike ku-1020–1060°C ukuze kuncibilikiswe izinto ezixubayo zibe yisisombululo esiqinile esifanayo.

2. Ukupholisa Okusheshayo (Ukucisha)– Ngokuvamile umoya noma uwoyela kuyacinywa ukuze kugcinwe isixazululo esiqinile.

3. Ukuguga (Ukuna kwemvula)– Ukufudumala kabusha kumazinga okushisa aphakathi kuka-480–620°C isikhathi esithile, okuvumela ukwakheka kwama-precipitate afana nama-compounds ethusi noma izigaba ze-intermetallic.

Ngokulungisa izinga lokushisa lokuguga nesikhathi, onjiniyela bangakwazi ukulungisa izakhiwo zemishini. Isibonelo, ukuguga emazingeni okushisa aphansi kuvame ukukhiqiza ubulukhuni obukhulu, kuyilapho amazinga okushisa okuguga aphezulu angandisa ukuqina.

Ukusetshenziswa kwe-Precipitation Hardening Stainless Steel

Izinsimbi ezingagqwali ze-PH zisetshenziswa kabanzi emikhakheni eyahlukene ngenxa yezakhiwo zazo ezilinganiselayo.

• Imboni Yezindiza– Izingxenye zesakhiwo, izingxenye zegiya lokufika, kanye nezingxenye zenjini ezidinga isilinganiso samandla aphezulu nesisindo.

• Imboni Yasolwandle– Imiphini yepropeller, izibambo, nezinye izingxenye ezivezwe emanzini olwandle.

• Uwoyela negesi– Izingxenye zamavalvu, imiphini yokupompa, namathuluzi okudonsa phansi okumele amelane nomfutho ophezulu kanye nezindawo ezigqwalayo.

• Ukucubungula Amakhemikhali– Izitsha ze-reactor, ama-mixer, kanye nemishini edinga ukumelana namakhemikhali agqwalisayo.

• Ukuzivikela kanye nezibhamu– Imiphongolo yezibhamu, amabhlogo omoya, nezinye izingxenye ezicindezela kakhulu.

• Amadivayisi Ezokwelapha– Amathuluzi okuhlinza, amathuluzi okwelapha amathambo, kanye nezinto ezifakwayo ezidinga amandla kanye nokuhambisana kwezinto eziphilayo.

Izinzuzo Zokusebenzisa Izinsimbi Ezingagqwali ze-PH

1. Amandla Aqhathaniswa Nezinsimbi Ze-Alloy– Izinsimbi ezingagqwali ze-PH zivame ukufana noma zidlule amandla ezinsimbi ze-alloy, kodwa zinokumelana okungcono kokugqwala.

2. Izindleko Zokulungisa Ezincishisiwe– Ukumelana okuhle kakhulu nokugqwala kunciphisa isidingo sokugqoka okuvikelayo noma ukushintshwa njalo.

3. Izixazululo Ezilula– Amandla aphezulu avumela ukwehla kobukhulu obunqamula izingxenye, ukwehlisa isisindo ngaphandle kokuphazamisa ukusebenza.

4. Ukuguquguquka Kwezinto Ezimbonini– Ingafakwa ngomshini isesimweni sokugoba bese iqiniswa kamuva.

5. Impilo Ende Yenkonzo- Igcina izakhiwo ngokuhamba kwesikhathi, ngisho nasezindaweni ezinzima.

Imikhawulo kanye nokucatshangelwa

Naphezu kwezinzuzo zazo, izinsimbi ezingagqwali ze-PH nazo zinemikhawulo:

• Izindleko– Ngokuvamile kubiza kakhulu kunezinsimbi ezivamile ezingagqwali.

• Imikhawulo Yokushisa– Amandla angonakala emazingeni okushisa ahlala isikhathi eside angaphezu kuka-300°C.

• Ukushibilika– Amanye amagreyidi angadinga ukwelashwa kokushisa ngemva kokushiswa ukuze kubuyiselwe izakhiwo zemishini.

Ukuqhathaniswa ne-Austenitic kanye ne-Martensitic Stainless Steels