Simbi dzisina ngura mbiri dzinoita zvinopfuura 80% yekushandiswa kwe duplex, super duplex uye hyper duplex grades. Dzakagadzirwa muma1930 kuti dzishandiswe mukugadzira mapepa ne pulp, duplex alloys dzakavakirwa pa22% Cr composition uye musanganiswa we austenitic:ferritic microstructure inopa hunhu hwakanaka hwemakanika.
Zvichienzaniswa nesimbi dzisina ngura dzinonzi 304/316 austenitic, mhuri yemhando mbiri dzesimbi dzine simba rakapetwa kaviri uye dzinopa simba rakawanda mukudzivirira ngura. Kuwedzera huwandu hwechromium musimbi dzisina ngura kunowedzera simba radzo rekudzivirira ngura. Zvisinei, Pitting Resistance Equivalent Number (PREN) iyo inofungidzira kuti alloys dzinodzivirira ngura kubva mugomba inosanganisirawo zvimwe zvinhu zvakawanda mufomura yayo. Kunzwisisa uku kunogona kushandiswa kutsanangura kuti musiyano uripo pakati peUNS S31803 neUNS S32205 wakatanga sei uye kana zvichikosha.
Mushure mekugadzirwa kwesimbi dzisina ngura mbiri, zvirevo zvavo zvekutanga zvakatorwa seUNS S31803. Zvisinei, vagadziri vakawanda vanotungamira vairamba vachigadzira giredhi iri kusvika kumusoro kwechirevo chinobvumidzwa. Izvi zvakaratidza chishuwo chavo chekuwedzera mashandiro ekuora kwesimbi, zvichibatsirwa nekuvandudzwa kwemaitiro ekugadzira simbi eAOD ayo akabvumira kudzora kwakasimba kwekuumbwa kwayo. Pamusoro pezvo, zvakabvumirawo huwandu hwekuwedzera kwenitrogen kukanganiswa, pane kungoonekwa sechinhu chekumashure. Saka, giredhi repamusoro resimbi mbiri rakatsvaga kuwedzera huwandu hwechromium (Cr), molybdenum (Mo) uye nitrogen (N). Musiyano uripo pakati pesimbi mbiri mbiri ine chimiro chayo chinosangana nepasi pechirevo, uchienzaniswa neinosvika pamusoro pechirevo unogona kuva mapoinzi akati wandei zvichibva pafomura PREN = %Cr + 3.3 %Mo + 16 % N.
Kuti kusiyanisa simbi isina tsvina inogadzirwa pamusoro pemhando yepamusoro, imwe specification yakaunzwa, inonzi UNS S32205. Simbi isina tsvina inogadzirwa neS32205 (F60) ichaenderana zvizere neS31803 (F51), nepo zvinopesana zvisiri zvechokwadi. Saka S32205 inogona kupihwa mbiri seS31803.
| Giredhi | Ni | Cr | C | P | N | Mn | Si | Mo | S |
| S31803 | 4.5-6.5 | 21.0-23.0 | 0.03 Yakanyanya | 0.03 Yakanyanya | 0.08-0.20 | 2.00 Yakanyanya | 1.00 Yakanyanya | 2.5-3.5 | 0.02 Yakanyanya |
| S32205 | 4.5-6.5 | 22-23.0 | 0.03 Yakanyanya | 0.03 Yakanyanya | 0.14-0.20 | 2.00 Yakanyanya | 1.00 Yakanyanya | 3.0-3.5 | 0.02 Yakanyanya |
SAKYSTEEL ine simbi isina tsvina mbiri (duplex stainless steel) inofarirwa neSandvik. Isu tine S32205 muhukuru hwayo kubva pa5/8″ kusvika 18″ dhayamita mubhara rakatenderera, uye midziyo yedu yakawanda iri muSanmac® 2205 grade, izvo zvinowedzera 'kugona kwekugadzira kwakajairwa' kune dzimwe nzvimbo. Pamusoro pezvo, tinewo simbi dzisina chinhu dzeS32205 kubva mudura redu reUK, uye purasitiki inosvika 3″ kubva mudura redu rePortland, USA.
Nguva yekutumira: Gumiguru-25-2019