A53 seamless kila paipu mea he American maʻamau kila paipu i maheleia i elua ano: A53A a me A53B.Among ia lakou, A53-A ua like ia me Kina ka 10 # kila, A53-B ua like me Kina ka 20 # kila, a me A53-F. ua like ia me ka mea q235 Kina.Ua kūpono nā paipu kila ASTM A53 no ka lawe ʻana i nā wai a me nā kinoea i loko o ka ʻaila, kūlohelohe, a me nā ʻoihana kemika.