I-F51, i-F53, i-F55, i-F60 kunye ne-F61 ziyi-duplex kunye ne-super duplex stainless steel designations ezithathwe kwi-ASTM A182. Lo mgangatho ungomnye wemigangatho echazwe ngokubanzi yokubonelela ngeentsimbi ezingenasici.
I-American Society of Testing and Materials (ASTM) ngomnye weyona mibutho inkulu yemigangatho yehlabathi, ephononongayo, ehlanganisayo kwaye epapasha imigangatho yobugcisa yoluhlu olubanzi olukhulayo lwezixhobo. Imigangatho epapashiweyo eqala ngonobumba 'A' intsimbi yokugquma.
I-ASTM i-A182 esemgangathweni ('Inkcazo eMiselweyo ye-Forged okanye i-Rolled Alloy kunye ne-Stainless Steel Pipe Flanges, iiFittings eziFakelweyo, kunye neeValuvu kunye neeNdawo zeNkonzo yoBubushushu obuphezulu') ngoku ikuhlelo lwayo lwe-19th (2019). Ekuhambeni kolu shicilelo, kongezwe ii-alloys ezintsha kwabelwa inombolo 'yebakala' elitsha. Isimaphambili sika-'F' sichaza ukufaneleka kwalo mgangatho kwiimveliso zomgunyathi. Isimamva senani sidityaniswe ngokuyinxenye ngohlobo lwealloyi okt austenitic, martensitic, kodwa asikho simiselo ngokupheleleyo. Izinto ezibizwa ngokuba yi-'Ferritic-Austenitic' iintsimbi ezimbini zinenombolo phakathi kwe-F50 kunye ne-F71, kunye namanani anyukayo ngokuyinxenye asondele kumabakala asanda kufakwa.
AmaBanga ahlukeneyo e-Duplex Stainless Steels
I-ASTM A182 F51 ilingana ne-UNS S31803. Le yayiyi-caption yokuqala ye-22% ye-Cr duplex yentsimbi engatyiwayo. Nangona kunjalo, njengoko kuchaziwe kwinqaku langaphambili, abavelisi baluphucule ukwakheka ukuya kuthi ga kwisiphelo esiphezulu semida yokuphucula ukuxhathisa kwi-corrosion. Eli bakala, elineenkcukacha ezingqongqo, libhalwe njenge-F60, elilingana ne-UNS S32205. Ngenxa yoko, i-S32205 inokuqinisekiswa kabini njenge-S31803 kodwa hayi ngokuphambeneyo. Ibalelwa malunga ne-80% yemveliso yensimbi engenasici. Langley Alloys stocksSanmac 2205, eyimveliso yomnini kaSandvik ebonelela 'ngobuchule obuphuculweyo njengomgangatho'. Uluhlu lwethu lwesitokhwe lusuka kwi-½” ukuya kuthi ga kwi-450mm yeebha ezomeleleyo zedayamitha, kunye nemivalo engenanto kunye nepleyiti nazo.
I-ASTM A182 F53 ilingana ne-UNS S32750. Le yi-25% ye-Cr super duplex steel stainless ikhuthazwa kakhulu nguSandvik njengeSAF2507. Ngomxholo owandisiweyo wechromium xa kuthelekiswa neF51 ibonelela ngokuphucuka kokumelana nomhlwa. Amandla esivuno nawo aphezulu, avumela abaqulunqi bamacandelo ukuba banciphise ubungakanani becandelo lezicelo ezithwala umthwalo. I-Langley Alloys stocks SAF2507 imivalo eqinileyo esuka eSandvik, ngokobukhulu ukusuka kwi-½” ukuya kwi-16” ububanzi.
I-ASTM A182 F55 ilingana ne-UNS S32760. Imvelaphi yeli bakala inokulandelwa emva ekuphuhlisweni kweZeron 100 nguPlatt & Mather, eManchester UK. Yenye i-super duplex steel stainless steel esekwe kwi-25% yokwakheka kwe-Cr, kodwa kunye nokongezwa kwe-tungsten. Langley Alloys stocksSAF32760imivalo eqinileyo esuka eSandvik, ngokobukhulu ukusuka kwi-½” ukuya kwi-16” ubukhulu.
I-ASTM A182 F61 ilingana ne-UNS S32550. Oku ke, kuqikelelo lweFerralium 255, eyona duplex yentsimbi yoqobo eyenziweLangley Alloys. Yasungulwa ngo-1969, ngoku ibonelele ngenkonzo enempumelelo kwiminyaka engaphezu kwama-50 kuluhlu olubanzi lwezicelo ezifuna ngamandla. Xa kuthelekiswa ne-F53 kunye ne-F55 ihambisa amandla awongeziweyo kunye nokusebenza komhlwa. Amandla ayo asezantsi esivuno adlula ama-85ksi, ngelixa amanye amabakala alinganiselwe kwi-80ksi. Ukongeza, iqulethe ukuya kuthi ga kwi-2.0% yobhedu, encedisa ukuchasana nokubola. Langley Alloys stocksFerralium 255-SD50ngokobukhulu ukusuka ku-5/8” ukuya kwi-14” ububanzi bebha eqinileyo, kunye neepleyiti ukuya kuthi ga kwi-3” ubukhulu.
Ixesha lokuposa: Mar-06-2020