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JBZQ4000.9-86 General technical requirements for assembly; JB/ZQ4000.3-1986 General technical requirements for welded parts; JBZQ 4000.7-1986 General technical requirements for forgings; JBZQ 4000.5-1986 General technical requirements for castings. These are the standards that are known so far; there might be others as well. 2.4.8.1.6… Moreover, Baidu indicates that this standard was issued in 1986, which means it’s been 30 years since then – hasn’t a new version been released yet?
JB has been replaced by NB; it seems that some JB versions have been released later on, and you can check them out on the Gongbiao website. For example, NB_T47009-2010_Forgings of carbon steel and alloy steel for pressure equipment; NB_T47010-2010_Forgings of carbon steel and alloy steel for pressure equipment; NB47008-47010-2010_Forgings of carbon steel and alloy steel for pressure equipment; NB47018_Technical specifications for ordering welding materials for pressure equipment