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According to EN 10219-1 the following denotements are defined:

CFCHS - cold formed circular hollow sections
CFRHS - cold formed square or rectangular hollow section

Cold formed (Circular / Rectangular / Square) hollow sections are formed at ambient temperature and are produced in accordance with standard EN10219-1

1.OD:20*20-800*800mm,up to 1300*1300mm,20*30--600*800mm up to 1000*1500mm
2.Thickness :2.0--40.0mm up to 60mm

3.Length:5.85m,6m,11.8m,12m

BS EN10219-1 Square Rectangular Hollow Section Chemical