Menene ASTM A992?

TheASTM A992Bayanin /A992M -11 (2015) ya bayyana sassan ƙarfe da aka yi birgima don amfani a cikin gine-gine, gine-ginen gadoji, da sauran gine-ginen da aka saba amfani da su. Ma'aunin ya ƙayyade rabon da ake amfani da shi don tantance abubuwan da ake buƙata na sinadarai don fannoni na nazarin zafi kamar: carbon, manganese, phosphorus, sulfur, vanadium, titanium, nickel, chromium, molybdenum, niobium, da jan ƙarfe. Ma'aunin ya kuma ƙayyade halayen matsi da ake buƙata don aikace-aikacen gwajin matsi kamar ƙarfin samarwa, ƙarfin matsi, da tsawaitawa.

ASTM A992(Fy = 50 ksi, Fu = 65 ksi) shine mafi kyawun bayanin martaba don sassan flange masu faɗi kuma yanzu yana maye gurbinsaASTM A36kumaA572Aji na 50. ASTM A992/A992M -11 (2015) yana da fa'idodi daban-daban: yana ƙayyade ƙarfin kayan, wanda shine matsakaicin rabon juriya zuwa yawan samarwa na 0.85; ban da haka, a ƙimar carbon daidai da kashi 0.5, yana ƙayyade cewa ƙarfin kayan shine kashi 0.85. , yana inganta ƙarfin walda na ƙarfe a ƙimar carbon daidai da 0.45 (0.47 ga bayanan martaba biyar a cikin Rukunin 4); kuma ASTM A992/A992M -11(2015) ya shafi duk nau'ikan bayanan ƙarfe masu zafi.

Bambance-bambance tsakanin kayan ASTM A572 Grade 50 da kayan ASTM A992 Grade
Kayan ASTM A572 Grade 50 suna kama da kayan ASTM A992 amma akwai bambance-bambance. Yawancin sassan flange masu faɗi da ake amfani da su a yau sune matakin ASTM A992. Duk da cewa ASTM A992 da ASTM A572 Grade 50 gabaɗaya iri ɗaya ne, ASTM A992 ya fi kyau dangane da abubuwan da ke cikin sinadarai da kuma kula da kadarorin injiniya.

ASTM A992 yana da mafi ƙarancin ƙimar ƙarfin samarwa da mafi ƙarancin ƙimar ƙarfin tensile, da kuma matsakaicin rabon ƙarfin samarwa zuwa matsakaicin ƙimar ƙarfin tensile da matsakaicin ƙimar carbon. Matsayin ASTM A992 ya fi rahusa a saya fiye da ASTM A572 Grade 50 (da matakin ASTM A36) don sassan flange masu faɗi.