Application: steel structures, machines, vehicles, agricultural machinery

Manufacturing process: Structural hollow sections shall be manufatured by electric welding or submerged arc welding without subsequent heat treatment.

Within the strength grades of the non-alloy steels, four qualities JR, J0, J2 and K2 are specified. These differ in respect of specified impact requirements, limits of various elements, with particular reference to sulfur and phosphorus, and the inspection and testing requirements.

Steel grades: S235JRH, S275J0H, S275J2H, S355J0H, S355J2H, S355K2H (non-alloy quality steels)

Designation for non-alloy steel hollow sections

Within the strength grades of the fine grain steels, four qualities N, NL, M and ML are specified. These differ in respect of the carbon, sulfur and phosphorus content and low temperature impact properties.
Steel grades: S275NH, S275NLH, S355NH and S355NLH (non-alloy quality steels)
Steel grades: S460NH, S460NLH, S275MH to S460MH and S275MLH to S460MLH (alloy special steels)

Designation for fine grain steel structural hollow sections

For steels of qualities JR, J0, J2 and K2 – as rolled or normalized / normalized rolled (N)
For steels of qualities N and NL – normalized / normalized rolled (N)
For steels of quality M and ML – thermomechanically rolled (M)

Outside diameter: from 21,3 mm to 1219,0 mm
Wall thickness: to 30 mm
Lengths: from 6 m to 12 m

Outside diameter.: ± 1%, with minimum ± 0,5 mm and maximum ± 10 mm
Wall thickness:
for outside diameters ≤ 406,4 mm:
wall thickness ≤ 5 mm ± 10%
wall thickness > 5 mm ± 0,5 mm
for outside diameters > 406,4 mm:
± 10% with maximum ± 2 mm

0,20% of total length and 3 mm for each 1 m of length

for qualities JR and J0: EN 10204-2.2
for qualities J2 + fine grain steels: EN 10204-3.1