NB/T 20005.9-2017 Carbon steel and low alloy steel for pressurized water reactor nuclear power plants Part 9: Grade 2 and 3 seamless steel pipes (English Version)
2017NB/T 20005.9-2017 Carbon steel and low alloy steel for pressurized water reactor nuclear power plants Part 9: Grade 2 and 3 seamless steel pipes
2010NB/T 20005.9-2010 Carbon steel and low alloy steel for pressurized water reactor nuclear power plants-Part 9: Seamless steel pipes for class 2,3 piping