High strength hot finished hollow sections suitable for all construction and mechanical applications. Celsius® 420 is suitable for all internal and external applications to BS5950-1:2000, EN1993 and BS5400.

Mechanical properties

Celsius 420 hollow sections are supplied with a minimum yield strength of 420 N/mm2 and comply fully with the European Standard for hot finished structural hollow sections, EN10210:S420NH.

Yield strength
ReH min N/mm2;
Tensile strength
Rm N/mm2
Elongation % min
L0 = 5,65 √S0
Impact strength
10mm x 10mm
Carbon equivalent
(CEV) max
T ≤ 16mm 3mm < T ≤ 100mm T ºC J  
420 520-680 19 -20 40 0.45

Chemical composition % by mass

C max 0.2
Si max 0.6
Mn 1.7
P max 0.035
S max 0.03
Nb max 0.05
V ma 0.2
Al total min 0.02
Ti max 0.03
Cr max 0.3
Ni max 0.8
Mo max 0.1
Cu max 0.7
N max 0.025

Note: CEV ≤ 0.45 compared to EN10210:S420 CEV ≤ 0.5

Celsius 420 is produced from fully-killed steel – critical to formability and weldability.

Inspection and testing

Celsius hollow sections EN10210:S420NH are subject to specific inspection and testing and are supplied with an inspection certificate type 3.1 to EN10204.