Iyini insimbi yesimo sezulu


Njengoba sishilo, insimbi yesimo sezulu ibizwa nangokuthi insimbi ye-weathering. Kafushane nje, uzothola ukuthi le nsimbi inguphawu lokuthengisa lwe-United States Steel Corporation. Inkinga ngezinto zokwakha ukuthi ngokuhamba kwesikhathi uvame ukuthola ungqimba lokugqwala kwakheka kuzo. Kungakhathaliseki ukuthi uzama kangakanani ukuyimisa, izongena ngaphakathi. Yingakho i-US Steel iqhamuke nombono. Ngokuhlinzeka ngezinto ezikhangayo, bazokwazi ukuvimbela ukuthi ungqimba lothuli lungakheki. Akukhona lokho kuphela, futhi kuvimbela insimbi ekuwohlokeni ngokuqhubekayo. Ngakho-ke akudingeki ukhathazeke ngokuyidweba ngezikhathi ezithile.


Ngakho nakuba konke kuzwakala kukuhle kakhulu ukuba kube yiqiniso, kufanele futhi ubeke izinto ngombono ongokoqobo. Lokhu kungenxa yokuthi nakuba ukugqwala kuzoqhubeka nokujiya, insimbi izojiya ngaphandle kokuhlosisa ukuzinza. Ngemva kokufinyelela iphuzu lokuphuka, insimbi ibhoboza bese idinga ukushintshwa. Yingakho kubalulekile ukukhumbula umehluko ezimweni zemvelo lapho ukhetha lolu hlobo lwensimbi.

Isebenza kanjani insimbi yesimo sezulu?

Zonke izinsimbi ze-alloy eziphansi noma eziningi ziyagqwala ngenxa yokuba khona komoya nomswakama. Izinga okwenzeka ngalo lokhu lizoncika ekuchayekeni kwayo emanzini, umoya-mpilo kanye nokungcola komkhathi okufika phezulu. Njengoba inqubo iqhubeka, ungqimba lokugqwala lwakha umgoqo ovimbela ukungcola, amanzi nomoya-mpilo ukuthi ungagelezi. Lokhu kuzosiza futhi ukubambezela inqubo yokugqwala ngezinga elithile. Ngokuhamba kwesikhathi, lolu ungqimba olugqwalile luphinde luhlukanise nensimbi. Njengoba uzokwazi ukuqonda, lokhu umjikelezo ophindayo.

Endabeni ye-Weathering steel, noma kunjalo, izinto zisebenza ngokuhlukile. Nakuba inqubo yokugqwala ngokuqinisekile izoqala ngendlela efanayo, ukuqhubeka kuzohluka kancane. Lokhu kungenxa yokuthi izakhi ze-alloying ensimbi zakha ungqimba oluzinzile lokugqwala olunamathela ensimbi eyisisekelo. Lokhu kuzosiza ukwakha umgoqo wokuvikela ukuvimbela ukungena okuqhubekayo komswakama, umoya-mpilo kanye nokungcola. Ngenxa yalokho, uzokwazi ukuthola amazinga okugqwala aphansi kakhulu kunalawo atholakala ngezinsimbi ezijwayelekile zesakhiwo.

I-Metallurgy yensimbi yesimo sezulu (weathering steel)


Umehluko oyisisekelo ongawuthola phakathi kwezinsimbi ezijwayelekile zesakhiwo kanye nesimo sezulu ukufakwa kwezakhi zethusi, i-chromium ne-nickel alloy. Lokhu kuzosiza ekuthuthukiseni ukumelana nokugqwala kwensimbi yesimo sezulu. Ngakolunye uhlangothi, lapho izinsimbi ezivamile zesakhiwo kanye namazinga ezinto ezibonakalayo ensimbi yesimo sezulu eqhathaniswa, zonke ezinye izakhi zibonakala zifana kakhulu noma zincane.


I-ASTM A242


Eyaziwa nangokuthi ingxubevange ye-A 242 yasekuqaleni, inamandla okukhiqiza angu-50 kSi (340 Mpa) namandla okugcina aqinile angu-70 kSi (480 Mpa) okukhanya okugoqekayo okuphakathi nendawo. Ngokuqondene namapuleti, angaba yizingxenye ezintathu kwezine zamasentimitha ubukhulu. Ngaphezu kwalokho, inamandla okugcina angu-67 ksi, amandla esivuno angu-46 ksi, kanye nobukhulu bepuleti busukela ku-0.75 ukuya ku-1 in.

Amandla okugcina namandla okukhiqiza amapuleti namaphrofayili ajiyile kakhulu angama-63 kSi no-42 kSi.


Ngokuqondene nesigaba sayo, ungayithola eziNhlotsheni 1 kanye no-2. Njengoba igama lisho, zonke zizosetshenziselwa izinhlelo zokusebenza ezahlukene, kuye ngokuthi ubukhulu bazo. Endabeni yohlobo 1, isetshenziswa kakhulu ekwakheni, izakhiwo zezindlu, namaloli. Ngokuqondene nensimbi yohlobo 2, eyaziwa nangokuthi i-Corten B, isetshenziselwa ikakhulukazi ama-cranes noma imikhumbi yabagibeli, kanye nefenisha yasemadolobheni.

I-ASTM A588


Ngamandla okuqina okugcina angu-70 ksi namandla esivuno okungenani angama-50 ksi, uzothola le nsimbi enesimo sezulu kuzo zonke izimo ezigoqiwe. Ngokuya ngobukhulu bepuleti, lokhu kungaba amayintshi angu-4 ubukhulu. Amandla okuqina aphezulu okungenani angama-67 kSI kumapuleti okungenani angama-intshi angu-4 ukuya kwangu-5. Amandla okuqina aphezulu okungenani angama-63 ksi futhi akhiphe amandla okungenani angama-42 ksi kumapuleti angu-5 - kuya kwangu-8-intshi.