Menene ASTM A992?

TheASTM A992/A992M -11 (2015) ƙayyadaddun ƙayyadaddun ƙayyadaddun sassan ƙarfe na birgima don amfani a cikin gine-gine, tsarin gada, da sauran tsarin da aka saba amfani da su. Ma'auni yana ƙayyadaddun ma'auni da aka yi amfani da su don ƙayyade abubuwan da ake buƙata na sinadarai don nazarin yanayin zafi kamar: carbon, manganese, phosphorus, sulfur, vanadium, titanium, nickel, chromium, molybdenum, niobium, da jan karfe. Ma'auni kuma yana ƙayyadaddun kaddarorin matsawa da ake buƙata don aikace-aikacen gwaji na ƙwanƙwasa kamar ƙarfin yawan amfanin ƙasa, ƙarfin ɗaure, da tsawo.

ASTM A992(Fy = 50 ksi, Fu = 65 ksi) shine ƙayyadaddun bayanin martaba da aka fi so don sassan flange mai faɗi kuma yanzu ya maye gurbinASTM A36kumaA572Grade 50. ASTM A992/A992M -11 (2015) yana da fa'idodi daban-daban: yana ƙayyade ductility na kayan, wanda shine matsakaicin tsayin daka don samar da rabo na 0.85; Bugu da kari, a daidai ƙimar carbon har zuwa 0.5 bisa dari, ya ƙayyade cewa ductility na kayan shine kashi 0.85. , yana inganta haɓakar ƙarfe na ƙarfe a daidaitattun ƙimar carbon har zuwa 0.45 (0.47 don bayanan martaba biyar a cikin Rukunin 4); da ASTM A992/A992M -11(2015) ya shafi kowane nau'in bayanan bayanan karfe mai zafi.

Bambance-bambance tsakanin ASTM A572 Grade 50 abu da ASTM A992 Grade abu
ASTM A572 Grade 50 abu yayi kama da kayan ASTM A992 amma akwai bambance-bambance. Yawancin sassan flange masu faɗi da ake amfani da su a yau sune darajar ASTM A992. Duk da yake ASTM A992 da ASTM A572 Grade 50 gabaɗaya iri ɗaya ne, ASTM A992 ya fi girma dangane da tsarin sinadarai da sarrafa kayan injin.

ASTM A992 yana da mafi ƙarancin ƙimar ƙarfin amfanin gona da ƙaramar ƙimar ƙarfin ƙarfi, haka kuma matsakaicin ƙarfin amfanin gona zuwa rabon ƙarfi na ƙarfi da matsakaicin ƙimar daidai carbon. Matsayin ASTM A992 ba shi da tsada don siye fiye da ASTM A572 Grade 50 (da ASTM A36 grade) don sassan flange masu faɗi.