Cov yeeb nkab vuam
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BS EN 10210-1: 2006 Cov khoom siv ua los ntawm cov hlau tsis yog hlau thiab cov hlau zoo
Cov hlau tsis yog hlau alloy, Cov Hlau Zoo Nkauj Hollow Section Steel hauv BSEN10210-1-2006 Txheem.
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BS EN 10219-1: Txias tsim welded cov qauv hollow seem ntawm cov hlau tsis-alloy thiab cov hlau nplua nuj
Cov khoom siv hollow uas ua los ntawm cov hlau tsis yog hlau thiab cov hlau zoo
