Izinsimbi ezingenasici eziyi-Duplex zenza >80% wokusetshenziswa kwe-duplex, i-super duplex kanye ne-hyper duplex amamaki. Yathuthukiswa ngeminyaka yawo-1930 ukuze isetshenziswe ekwenziweni kwephepha ne-pulp, ama-alloys ayi-duplex asuselwa ekubunjweni kuka-22% we-Cr kanye ne-mixed austenitic:ferritic microstructure eletha izakhiwo ezifiselekayo zokuwakha.
Uma kuqhathaniswa ne-generic 304/316 austenitic stainless steels, umndeni wamabanga ayi-duplex ngokuvamile uzoba namandla aphindwe kabili futhi unikeze ukuphakanyiswa okubalulekile ekumelaneni nokugqwala. Ukwenyusa okuqukethwe kwe-chromium kwezinsimbi ezingagqwali kuzonyusa ukumelana nokugqwala kwe-pitting. Kodwa-ke, i-Pitting Resistance Equivalent Number (PREN) efaka ukumelana nama-alloys ekugqwaleni kwe-pitting ihlanganisa nenani lezinye izici kufomula yayo. Lokhu buqili bungasetshenziswa ukuchaza ukuthi umehluko phakathi kwe-UNS S31803 ne-UNS S32205 uthuthuke kanjani nokuthi ubalulekile yini.
Kulandela ukuthuthukiswa kwezinsimbi ezingenasici eziyi-duplex, ukucaciswa kwazo kokuqala kwathathwa njenge-UNS S31803. Kodwa-ke, abakhiqizi abaningi abahamba phambili bebelokhu bekhiqiza leli banga kuze kube sekugcineni okuphezulu kokucaciswa okuvumelekile. Lokhu kubonise isifiso sabo sokwandisa ukusebenza kokugqwala kwe-alloy, okusizwa ukuthuthukiswa kwenqubo yokwenza insimbi ye-AOD evumela ukulawula okuqinile kokubunjwa. Ngaphezu kwalokho, kuphinde kwavumela izinga lokungezwa kwe-nitrogen ukuba lithonywe, kunokuba libe khona njengendawo engemuva. Ngakho-ke, ibanga le-duplex elisebenza kakhulu lifuna ukukhulisa amazinga e-chromium (Cr), i-molybdenum (Mo) ne-nitrogen (N). Umehluko phakathi kwengxubevange eyi-duplex ukwakheka kwayo okuhlangabezana nokuphansi kokucaciswa, uma kuqhathaniswa neyodwa efika phezulu kwesicaciso kungaba amaphuzu amaningana asekelwe kufomula ethi PREN = %Cr + 3.3 %Mo + 16 % N.
Ukuze kuhlukaniswe i-duplex yensimbi engagqwali ekhiqizwe ekugcineni okuphezulu kwebanga lokuqamba, kwethulwa okunye ukucaciswa, okuyi-UNS S32205. Insimbi engagqwali e-Duplex eyenziwe ku-S32205 (F60) amagama-ncazo azohlangabezana ngokugcwele namagama-ncazo we-S31803 (F51), kuyilapho okuhlanekezelwe kungelona iqiniso. Ngakho-ke i-S32205 ingagunyazwa kabili njenge-S31803.
| Ibanga | Ni | Cr | C | P | N | Mn | Si | Mo | S |
| I-S31803 | 4.5-6.5 | 21.0-23.0 | Ubukhulu 0.03 | Ubukhulu 0.03 | 0.08-0.20 | Ubukhulu 2.00 | Ubukhulu 1.00 | 2.5-3.5 | Ubukhulu 0.02 |
| I-S32205 | 4.5-6.5 | 22-23.0 | Ubukhulu 0.03 | Ubukhulu 0.03 | 0.14-0.20 | Ubukhulu 2.00 | Ubukhulu 1.00 | 3.0-3.5 | Ubukhulu 0.02 |
I-SAKYSTEEL inezinhlobo eziningi zensimbi engagqwali eyi-duplex njengozakwethu wokusabalalisa okhethwayo we-Sandvik. Sigcina i-S32205 ngosayizi ukusuka ku-5/8″ kufika ku-18″ ububanzi kubha eyindilinga, iningi lesitoko sethu likubanga le-Sanmac® 2205, elengeza 'ukusebenza okuthuthukisiwe njengokujwayelekile' kwezinye izakhiwo. Ngaphezu kwalokho, siphinde sibeke uhla lwamabha angenalutho e-S32205 asuka esitolo sethu sase-UK, namapuleti afika ku-3″ ukusuka esitolo sethu sasePortland, e-USA.
Isikhathi sokuthumela: Oct-25-2019