EN-Construction-Product-Hybox cold formed high-grade hollow sections | Key product features

Key product features

Hybox® 355 - Cold formed structural hollow section

Key product features:

Excellent quality, made with steel from a high quality production process
Minimum strength of 355 N/mm²
Properties suitable for low temperature applications (27J @ -20°C)
Dimensional consistency and corner radius controlled
High levels of formability and, because the steel is fully-killed, excellent weldability
Suitable for applications demanding specific properties
Suitable for structural applications and fully compliant with design codes
Batch-tested to give the properties of the specific delivered material; full test certification supplied
Clearly marked as Hybox 355, with the reassurance of batch traceability
Specific technical support available
Excellent supply availability through approved stockholders
All Hybox 355 material is CE marked and is fully compliant with the Construction Products Regulation (CPR)
Suitable for galvanising

EN-Construction-Product-Hybox cold formed high-grade hollow sections | Mechanical properties

Mechanical properties

Yield strength	Tensile strength		Elongation % min	Impact strength		Carbon equivalent
R_eH min N/mm²	R_m min N/mm²		L₀ = 5,65 √S₀specimen	10mm x 10mm		(CEV) max
T≤16mm	T < 3mm	3mm≤T≤40mm	T ≤ 40mm	ºC	J
355	510-680	470 - 630	20	-20*	27	0.45

For section sizes D/T < 15 (circular) and (B+H)/ 2T < 12.5 (square/rectangle) min elongation is reduced by 2%.

Chemical composition
% by mass

C	Si	Mn	P	S
0.22	0.55	1.60	0.030	0.030

Hybox^® 355 is produced from fully killed steel - critical to formability and weldability.

EN-Construction-Product-Tubes-Hybox-Dimensional tolerancesTSE

Dimensional tolerances

Dimensional capability

Hybox® 355 are available in sizes from 26.9 x 2.0 OD up to and including 508.0 x 16 OD in our circular hollow sections range and from 25 x 25 x 2.0 up to and including 300 x 300 x 12.5 and the equivalent rectangles in our rectangular hollow section range.

Hybox 355 is supplied with a test report 3.1 to EN10204. Standard lengths are 7.5 metres and 12.0 metres, with special mill lengths from 6 metres up to 18m available by arrangement.

Further details of specific size and grade combinations are available upon request.

Dimensional tolerances

Dimensional tolerances are in accordance with EN10219: Part 2

	Circular	Square / Rectangular - Side length (mm)	Square / Rectangular - Tolerance
Outside dimension (D B and H)	±1% with a min of ±0.50mm and a max of ±10mm	H,B < 100 100 ≤ H,B ≤ 200 H, B > 200	±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)	For D > 406.4mm ±10% with a max of ±2mm 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 T > 10.0	1.6T to 2.4T 2.0T to 3.0T 2.4T to 3.6T
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
Length	-0 +50mm	-0 +50mm