Tender For supply of al bronze round 60 mm dia to matl. specn. brazh9lr gost 18175-78/grade ab1 is: 305-1981 , bronze 145 mm dia. proof machined (manganese bronze casting) to spec. is: 304-1981, grade ht b 1 or b , phosphor bronze round bar dia. 50 mm to is: 78111985. acceptance criteriar based test piece trial for , al. bronze 60 mm square bar to drg. no. mpf/lf/8711752060