... :GR1. GR2, GR3, GR5, GR7, GR9, GR11, GR12, 2.Standard:ASTM B337 B338 B862 B861 3.customer's designs are acceptable ... , GR9, GR11, GR12, GR23StandardASTM B337 B338 B862 B861Final product testUltrasonic,eddy current test,hydraulic test,bend test,haring testApplicationgenvironmental protection equipment cooling ...