JB/T 7948.2-1999 JB/T 7948.2-1999 Chemical analysis method for melting flux Potentiometric titration method for determination of m

JB/T 7948.1-1999 JB/T 7948.1-1999 Chemical analysis methods for melting fluxes Gravimetric determination of silicon dioxide conten

JB/T 7947-1999 This standard is a revision of JB/T 7947-95 "Isobaric Welding Torches and Cutting Torches". This standard applies t

JB/T 7946.4-1999 JB/T 7946.4-1999 Grain size of cast aluminum-copper alloy JB/T7946.4-1999 Standard download decompression passwor

JB/T 7946.3-1999 This standard is a revision of JB/T 7946.3-95 "Pinholes in Cast Aluminum Alloys". During the revision, only edito

JB/T 7946.1-1999 This standard is a revision of JB/T 7946.1-95 "Modification of Cast Aluminum-Silicon Alloys". During the revision

JB/T 7946.2-1999 JB/T 7946.2-1999 Cast aluminum silicon alloy overburning JB/T7946.2-1999 Standard download decompression password

JB/T 7945-1999 This standard is a revision of JB/T 7945-95 "Test Methods for Mechanical Properties of Gray Cast Iron". During the