EN-Construction-Product-Strongbox cold formed hollow sections | Key product features

Key product features

General hollow sections - Strongbox® 235 Key features <ul> <li>Excellent quality, made with steel from a high quality production process</li> <li>Minimum strength of 235 MPa</li> <li>High levels of formability and, because the steel is fully-killed, excellent weldability</li> <li>Product subject to non-specific inspection and testing; with test report supplied</li> <li>Excellent consistent dimensional tolerances</li> <li>Excellent supply availability through approved stockholders</li> <li>Suitable for galvanising</li> </ul>

EN-Construction-Product-Strongbox cold formed hollow sections | Mechanical properties

Mechanical properties

Yield strength ReH min N/mm2 T≤16mm 235 Strongbox® 235 hollow sections EN10219 S235JRH are subject to non-specific inspection and testing and are supplied with a test report type 2.2 to EN10204.

EN-Construction-Product-Tubes-Strongbox-Dimensional tolerancesTSE

Dimensional tolerances

Circular		Square/Rectangular
Outside dimension (D B and H)	±1% with a min of ±0.50mm and a max of ±10mm	Side length (mm) H,B < 100 100 ≤ H,B H,B > 200	Tolerance ±1% with a min of ±0.5mm ±0.8% ±0.6%
Thickness (T)	For D≤406.4mm T ≤ 5mm ±10% T > 5mm ±0.50mm	T ≤ 5mm T > 5mm	± 10% ±0.50mm
Out of roundness (O)	2% for D/T < 100, where D/T ≥ 100 out-of-roundness tolerance to be agreed	-
Concavity/Convexity (independent tolerance on outside dimensions)	-	Max 0.8% with a min of 0.5mm
Squareness of side	-	90º ± 1
External corner profile (radius need not be tangential to the sides) EN10219: Part 2 Table 3	-	T ≤ 6.0 6.0 < T ≤10.0	1.6T to 2.4T 2.0T to 3.0T
Twist (V)	-	2mm plus 0.5mm/m length
Straightness	0.20% of total length & 3mm over any 1m length	0.15% of total length & 3mm over any 1m length
Mass (M) ±6% on individual lengths	±6% on individual lengths	±6% on individual lengths
Length -0 +50mm	-0 +50mm	-0 +50mm