结构管材 meaning in Chinese

structural tube

Aerospace ; seamless structural tubes in steel and nickel alloys ; technical specification
航空航天.钢和镍合金无缝结构管材.技术规范
Specification for aluminium and aluminium alloy wrought products - technical specification - tube for structures
铝和铝合金锻制产品规范.技术规范.结构管材
Aerospace ; seamless structural tubes in wrought aluminium alloys ; technical specification ; inactive for new design
航空航天.锻铝合金无缝结构管材.技术规范.不适用于新