Iintsimbi eziqinileyo ze-duplex zingaphezulu kwama-80% okusetyenziswa kwee-duplex, ii-super duplex kunye nee-hyper duplex grades. Zaphuhliswa ngeminyaka yoo-1930 ukuze zisetyenziswe ekwenziweni kwephepha kunye ne-pulp, ii-duplex alloys zisekelwe kwi-22% Cr composition kunye ne-mixed austenitic:ferritic microstructure enika iipropati ezinqwenelekayo zoomatshini.
Xa kuthelekiswa neentsimbi ze-austenitic stainless steels eziqhelekileyo ezingama-304/316, usapho lwee-duplex grades ludla ngokuba namandla aphindwe kabini kwaye lubonelele ngokunyuka okukhulu ekumelaneni nokugqwala. Ukunyusa umxholo we-chromium weentsimbi ze-stainless steels kuya kwandisa ukuxhathisa kwazo ukugqwala kwe-pitting. Nangona kunjalo, i-Pitting Resistance Equivalent Number (PREN) egqiba ukuxhathisa kwe-alloys kwi-pitting corrosion ikwabandakanya nezinye izinto ezininzi kwifomyula yayo. Olu buchule lungasetyenziselwa ukuchaza indlela umahluko phakathi kwe-UNS S31803 kunye ne-UNS S32205 owavela ngayo kunye nokuba ubalulekile na.
Emva kokuphuhliswa kweentsimbi eziqinileyo ze-duplex, iinkcukacha zazo zokuqala zathathwa njenge-UNS S31803. Nangona kunjalo, inani labavelisi abaphambili babesoloko bevelisa olu didi ukuya kwisiphelo esiphezulu senkcazo evumelekileyo. Oku kwabonakalisa umnqweno wabo wokwandisa ukusebenza kokugqwala kwe-alloy, bencediswa kukuphuhliswa kwenkqubo yokwenza intsimbi ye-AOD eyavumela ulawulo oluqinileyo lokwakheka. Ukongeza, kwavumela nenqanaba lokongezwa kwe-nitrogen ukuba lichaphazeleke, endaweni yokuba livele nje njengento engasemva. Ke ngoko, izinga eliphezulu le-duplex elisebenza lifuna ukwandisa amanqanaba e-chromium (Cr), i-molybdenum (Mo) kunye ne-nitrogen (N). Umahluko phakathi kwe-duplex alloy enokwakheka kwayo okuhlangabezana nezantsi kwenkcazo, ngokuchasene nenye efikelela phezulu kwenkcazo unokuba ngamanqaku amaninzi asekelwe kwifomula i-PREN = %Cr + 3.3 %Mo + 16 % N.
Ukuze kwahlulwe intsimbi engagqwaliyo ye-duplex eveliswe phezulu koluhlu lokudibanisa, kwaveliswa enye inkcazo, eyi-UNS S32205. Intsimbi engagqwaliyo ye-duplex eyenziwe kwi-caption ye-S32205 (F60) iya kuhlangabezana ngokupheleleyo ne-caption ye-S31803 (F51), ngelixa okuchaseneyo kungeyonyani. 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 | Ubuninzi 0.03 | Ubuninzi 0.03 | 0.08-0.20 | Ubuninzi 2.00 | Ubuninzi 1.00 | 2.5-3.5 | Ubuninzi 0.02 |
| S32205 | 4.5-6.5 | 22-23.0 | Ubuninzi 0.03 | Ubuninzi 0.03 | 0.14-0.20 | Ubuninzi 2.00 | Ubuninzi 1.00 | 3.0-3.5 | Ubuninzi 0.02 |
I-SAKYSTEEL ineentsimbi ezipheleleyo ze-duplex stainless steel njengeqabane elithandwayo lokusasaza iSandvik. Sine-S32205 ngobukhulu ukusuka kwi-5/8″ ukuya kwi-18″ ububanzi kwi-bar engqukuva, uninzi lwezitokhwe zethu zikwinqanaba leSanmac® 2205, nto leyo eyongeza 'ubuchule bokusebenza obuphuculweyo' kwezinye iipropati. Ukongeza, sikwagcina uluhlu lwe-S32205 hollow bar evela kwindawo yethu yokugcina impahla yase-UK, kwaye sibeka i-plate ukuya kuthi ga kwi-3″ ukusuka kwindawo yethu yokugcina impahla yasePortland, e-USA.
Ixesha leposi: Oktobha-25-2019