Izinsimbi ezingagqwali ze-Duplex zibiza ngaphezu kwama-80% okusetshenziswa kwe-duplex, i-super duplex kanye ne-hyper duplex grades. Zakhiwa ngawo-1930 ukuze zisetshenziswe ekwakhiweni kwephepha kanye ne-pulp, ama-duplex alloys asekelwe ku-22% Cr composition kanye ne-mixed austenitic:ferritic microstructure enikeza izakhiwo ezifiselekayo zemishini.
Uma kuqhathaniswa nezinsimbi ezivamile ze-austenitic stainless steels ezingama-304/316, umndeni wezinhlobo ezimbili ngokuvamile uzoba namandla aphindwe kabili futhi unikeze ukuphakama okukhulu ekumelaneni nokugqwala. Ukwandisa okuqukethwe kwe-chromium kwezinsimbi ezingcwecwe kuzokwandisa ukumelana kwazo nokugqwala kwe-pitting. Kodwa-ke, i-Pitting Resistance Equivalent Number (PREN) enquma ukumelana kwe-alloys nokugqwala kwe-pitting ifaka nezinye izinto eziningi kufomula yayo. Lokhu kungabonakali kungasetshenziswa ukuchaza ukuthi umehluko phakathi kwe-UNS S31803 ne-UNS S32205 wathuthuka kanjani nokuthi ngabe uyabalulekile yini.
Ngemva kokuthuthukiswa kwezinsimbi ezingagqwali ze-duplex, ukucaciswa kwazo kokuqala kwathathwa njenge-UNS S31803. Kodwa-ke, abakhiqizi abaningi abaphambili babekhiqiza leli banga njalo kuze kube sekupheleni kwencazelo evumelekile. Lokhu kwabonisa isifiso sabo sokukhulisa ukusebenza kokugqwala kwe-alloy, ngosizo lokuthuthukiswa kwenqubo yokwenza insimbi ye-AOD eyavumela ukulawulwa okuqinile kokwakheka. Ngaphezu kwalokho, kwavumela nokuthi izinga lokungezwa kwe-nitrogen lithonywe, kunokuba nje livele njengento yangemuva. Ngakho-ke, izinga le-duplex elisebenza kahle kakhulu lalifuna ukwandisa amazinga e-chromium (Cr), i-molybdenum (Mo) kanye ne-nitrogen (N). Umehluko phakathi kwe-alloy ye-duplex okukwakheka kwayo kuhlangana phansi kwencazelo, uma kuqhathaniswa nenye efika phezulu kwencazelo ungaba amaphuzu amaningana ngokusekelwe kufomula ethi PREN = %Cr + 3.3 %Mo + 16 % N.
Ukuze kuhlukaniswe insimbi engagqwali ye-duplex ekhiqizwe ekugcineni okuphezulu kobubanzi bokwakheka, kwethulwa enye imininingwane, okungukuthi i-UNS S32205. Insimbi engagqwali ye-duplex eyenziwe ku-S32205 (F60) izohlangabezana ngokugcwele ne-S31803 (F51), kanti okuphambene nalokho akulona iqiniso. Ngakho-ke i-S32205 ingaqinisekiswa kabili njenge-S31803.
| Ibanga | Ni | Cr | C | P | N | Mn | Si | Mo | S |
| S31803 | 4.5-6.5 | 21.0-23.0 | Umkhawulo ongu-0.03 | Umkhawulo ongu-0.03 | 0.08-0.20 | Ubuningi obungu-2.00 | Umkhawulo ongu-1.00 | 2.5-3.5 | Umkhawulo ongu-0.02 |
| S32205 | 4.5-6.5 | 22-23.0 | Umkhawulo ongu-0.03 | Umkhawulo ongu-0.03 | 0.14-0.20 | Ubuningi obungu-2.00 | Umkhawulo ongu-1.00 | 3.0-3.5 | Umkhawulo ongu-0.02 |
I-SAKYSTEEL inezinhlobo eziningi zensimbi engagqwali ezimbili njengomlingani okhethwayo wokusabalalisa we-Sandvik. Sine-S32205 ngobukhulu obusukela ku-5/8″ kuya ku-18″ ububanzi kubha eyindilinga, kanti iningi lempahla yethu lisesigabeni se-Sanmac® 2205, okwengeza 'ukusebenza kahle komshini okuthuthukisiwe njengokujwayelekile' kwezinye izakhiwo. Ngaphezu kwalokho, siphinde sibe nezinhlobo ezahlukene zebha engenalutho ye-S32205 kusuka kubha yethu yokugcina impahla yase-UK, futhi sibeka ipuleti elingafika ku-3″ kusuka kubha yethu yokugcina impahla yasePortland, e-USA.
Isikhathi sokuthunyelwe: Okthoba-25-2019