Official Answer
Answer
A286 (ASTM A638) wani ƙarfe ne na hazo mai ƙarfi-mai ƙarfi wanda ke kiyaye ingantacciyar ductility da ƙarfin tasiri a yanayin zafi na cryogenic, sabanin ƙarfe na ƙarfe ko martensitic wanda ya zama gaggautsa. Don maɓuɓɓugan ruwa na cryogenic, kayan yawanci ana kula da su kuma an taurare shekaru don haɓaka hazo gamma-prime. Dole ne a lissafta ƙimar haɓakar haɓakar thermal faɗaɗa $alpha$ a cikin ƙirar taro, saboda bazarar za ta yi kwangila fiye da kewayen gidan ƙarfe na carbon a yanayin yanayin ruwa na nitrogen. Modulus $E$ kuma yana ƙaruwa kaɗan yayin da zafin jiki ke faɗuwa, yana haifar da mafi girman ƙimar bazara a cikin sabis.
