2017NB/T 47008-2017 Carbon steel and alloy steel forgings for pressure equipment
2010NB/T 47008-2010 Carbon steel and alloy steel forgings for pressure equipment
2000JB 4726-2000 Carbon and low-alloy steel forgings for pressure vessels
1970JB 4726-1994 Carbon steel and low alloy steel forgings for pressure vessels
NB/T 47008-2010 Carbon steel and alloy steel forgings for pressure equipment has been changed from JB 4726-2000 Carbon and low-alloy steel forgings for pressure vessels.