I-Duplex stainless steels i-akhawunti ye-80% yokusetyenziswa kwe-duplex, i-super duplex kunye ne-hyper duplex grade. Yaphuhliswa ngeminyaka yee-1930 ukuze isetyenziswe ekwenziweni kwephepha kunye nentlama, iialloyi eziphindwe kabini zisekwe malunga nokwakheka kwe-22% yeCr kunye ne-mixed austenitic:i-ferritic microstructure enikezela ngeempawu ezinqwenelekayo zoomatshini.
Xa kuthelekiswa ne-generic 304/316 austenitic stainless steels, intsapho yamabanga aphindwe kabini iya kuba namandla aphindwe kabini kwaye ibonelele ngokunyuka okubalulekileyo ekuxhathiseni ukubola. Ukwandisa umxholo wechromium yeentsimbi ezingenasici kuya kwandisa ukuxhathisa kwe-pitting corrosion. Nangona kunjalo, i-Pitting Resistance Equivalent Number (PREN) eyenza ukuxhathisa i-alloys kwi-corrosion ye-pitting iquka inani lezinye izinto kwifomula yayo. Obu buqhetseba bunokusetyenziswa ukuchaza indlela umahluko phakathi kwe-UNS S31803 kunye ne-UNS S32205 ephuhliswe ngayo kwaye ingaba ibalulekile na.
Ukulandela uphuhliso lweentsimbi eziphindwe kabini, inkcazo yazo yokuqala yabanjwa njenge-UNS S31803. Nangona kunjalo, inani labavelisi abakhokelayo bebesoloko bevelisa eli bakala ukuya kwisiphelo esiphezulu senkcazo evumelekileyo. Oku kwabonisa umnqweno wabo wokwandisa ukusebenza kwe-corrosion ye-alloy, encediswa kuphuhliso lwenkqubo ye-AOD yokwenza insimbi evumela ukuba kube lula ukulawula ukubunjwa. Ukongeza, iphinde yavumela inqanaba lezongezo zenitrogen ukuba ziphenjelelwe, kunokuba zibekho njengendawo yangasemva. Ke ngoko, elona bakala liphezulu le-duplex eliqhubayo lifuna ukunyusa amanqanaba e-chromium (Cr), i-molybdenum (Mo) kunye ne-nitrogen (N). Umahluko phakathi kwengxubevange ye-duplex ekubunjwe kwayo kuhlangana ezantsi kolubalulo, xa ithelekiswa nenye ibetha phezulu kubalulo inokuba ngamanqaku amaninzi ngokusekelwe kwifomula PREN = %Cr + 3.3 %Mo + 16 % N.
Ukuze ukwahlula i-duplex yensimbi engenasici eveliswe kwisiphelo esiphezulu soluhlu lokuqulunqa, enye inkcazo yaziswa, eyi-UNS S32205. I-Duplex yensimbi engenasici eyenziwe kwi-S32205 (F60) i-caption iya kuhlangabezana ngokupheleleyo ne-S31803 (F51) caption, kanti umva awuyonyani. Ke ngoko i-S32205 inokuqinisekiswa kabini njenge-S31803.
| IBanga | Ni | Cr | C | P | N | Mn | Si | Mo | S |
| S31803 | 4.5-6.5 | 21.0-23.0 | Ubukhulu 0.03 | Ubukhulu 0.03 | 0.08-0.20 | Ubuninzi 2.00 | Ubukhulu be-1.00 | 2.5-3.5 | Ubuninzi 0.02 |
| S32205 | 4.5-6.5 | 22-23.0 | Ubukhulu 0.03 | Ubukhulu 0.03 | 0.14-0.20 | Ubuninzi 2.00 | Ubukhulu be-1.00 | 3.0-3.5 | Ubuninzi 0.02 |
I-SAKYSTEEL igcina uluhlu olubanzi lwe-duplex yensimbi engenasici njengeqabane lokusabalalisa elikhethiweyo le-Sandvik. Sigcina i-S32205 ngokobungakanani ukusuka ku-5/8″ ukuya kwi-18″ ububanzi kwibha engqukuva, uninzi lwesitokhwe sethu sikuSanmac® 2205 grade, esongeza 'ubuchule obuphuculweyo njengomgangatho' kwezinye iipropathi. Ukongeza, sikwagcina uluhlu lwe-S32205 yebha engenanto ukusuka kwindawo yethu yokugcina e-UK, kunye nepleyiti ukuya kuthi ga kwi-3 ″ ukusuka kwindawo yethu yokugcina impahla yasePortland, eMelika.
Ixesha lokuposa: Oct-25-2019