Ii-alloys zemveli zidlala indima eqhelekileyo kwimveliso yeesinyithi, nokuba yintsimbi engatyiwayo esetyenziswa kwizixhobo zonyango okanye kwizilwanyana zaselwandle, naziphi na izizukulwana zeentsimbi ezisebenza kakuhle eziphuhliswe kwiminyaka embalwa edlulileyo kwishishini leemoto, okanye iisinyithi ezifana ne-aluminium kunye ne-titanium. Ezinamandla aphezulu ukuya kubunzima kunye nokumelana nokugqwala okuphezulu kwenza ukuba zifaneleke ngokukodwa kwizicelo kwimizi-mveliso yeenqwelo-moya, ukucocwa kweoyile kunye neekhemikhali.
Oku kuyasebenza nakwezinye ii-alloys zentsimbi yekhabhoni, ingakumbi ii-alloys ezinomxholo othile wekhabhoni kunye ne-manganese. Ngokuxhomekeke kubungakanani bezinto ezidibanisayo, ezinye zazo zifanelekile ukwenziwaiiflange, izixhobo zokufakelwakwayeimibhobhokwiindawo zokucoca iikhemikhali neoyile. Zonke zinento enye ezifanayo: izixhobo ezisetyenziswa kwezi zicelo kufuneka zibe mdaka ngokwaneleyo ukumelana nokuqhekeka okubuthathaka kunye nokuqhekeka koxinzelelo (SCC).
Imibutho yemigangatho efana ne-American Society of Manufacturing Engineers (ASME) kunye ne-ASTM Intl. (eyayisakwaziwa njenge-American Society for Testing and Materials) inika isikhokelo kule nkalo. Iikhowudi ezimbini ezinxulumeneyo zoshishino-Ibhoyila ye-ASMEkunye neSikepe soXinzelelo (i-BPVD) Icandelo VIII, Icandelo 1, kunye ne-ASME B31.3, iProcess Piping - ijongana nentsimbi yekhabhoni (nantoni na equlethe i-0.29% ukuya kwi-0.54% yekhabhoni kunye ne-0.60% ukuya kwi-1.65% ye-manganese, izinto eziqulethe isinyithi). iguquguquka ngokwaneleyo ukusetyenziswa kwiindawo ezishushu, kwiindawo ezishushu kunye namaqondo obushushu aphantsi njenge--20 degrees Fahrenheit. Nangona kunjalo, iingxaki zakutshanje kubushushu obuphakathi zikhokelele ekuhlolweni okusondeleyo kwezixa kunye nobungakanani bezinto ezahlukeneyo ze-microalloying ezisetyenziswa ekwenziweni kwee-flanges, izixhobo kunye imibhobho yentsimbi ye-api.
Kude kube kutshanje, i-ASME okanye i-ASTM azizange zifune uvavanyo lwempembelelo ukuqinisekisa ukuguquguquka kweemveliso ezininzi zentsimbi yekhabhoni ezisetyenziswa kumaqondo obushushu aphantsi njenge--20 degrees Fahrenheit. Isigqibo sokukhupha iimveliso ezithile sisekelwe kwiimpawu zembali zezinto ezisetyenzisiweyo. Umzekelo, xa ubushushu obuncinci boyilo lwesinyithi (MDMT) buyi--20 degrees Fahrenheit, ayifakwanga kuvavanyo lwempembelelo ngenxa yendima yayo yesiqhelo kwizicelo ezinjalo.
Ixesha lokuthumela: Epreli-19-2023