NB/T 47019.6-2021
specifications for ordering tubes for boilers and heat exchangers - Part 6: Austenitic-ferritic duplex stainless steel 锅炉、热交换器用管订货技术条件 第6部分:奥氏体-铁素体型双相不锈钢 |
NB/T 10498-2021
specification for engineering design of AC 110kV ~ 500kV power cables for hydropower plants 水力发电厂交流110kV~500kV电力电缆工程设计规范 |
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