S420NH
Specification details for S420NH

EN-ConstructionEngineering-Product-Tubes-Celsius-S420NH Key features

Key features
  • Fully normalized structural hollow sections, compliant with EN 10210:S420NH
  • High strength steel enabling up to 17% weight saving in certain applications
  • Normalized fine grain steel, so free of internal stresses and with a minimum strength of 420N/mm2 allowing the highest fabrication factors and enabling material cost savings and lighter structures
  • Available in a wide size range of circular (42.4 x 3.2mm to 5.8 x 16mm) square (40 x 40 x 3.2mm to 400 x 400 x 16mm) rectangular (50 x 30 x 3.2mm to 500 x 300 x 16mm) hollow sections
  • Tight corner radii (<2T) exceeding the standard - enhancing the product’s aesthetic appeal whilst avoiding the risk of brittle fracture which occurs in some cold formed products
  • Excellent dimensional consistency, high levels of formability, suitable for galvanising and, because the steel is fully-killed, excellent weldability
  • Fully compliant with CE marking and certified as suitable for all structural applications; overcomes design risks associated with other forms of hollow sections
  • Certified as suitable for mechanical applications, especially those involving cyclical loading
  • Suitable for low temperature applications (40J @ -20°C)
  • Batch-tested to give the properties of the specific delivered material; full test certification supplied
  • Clearly marked as Celsius® S420NH, and supplied with a 3.1 test certificate for the reassurance of batch traceability
  • Full technical support available

EN-ConstructionEngineering-Product-Tubes-Celsius-S420NH Properties

Properties

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
specimen
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.

EN-ConstructionEngineering-Product-Tubes-Celsius-All grades Tolerances

Tolerances

Dimensional tolerances EN10210: Part 2

Celsius grades are manufactured to the tolerances defined in EN 10210: Part 2. Tighter tolerances are available on request and if you require specific tolerances in excess of this, please contact us.

  Circular/Ellipticals Square/Rectangular
Outside dimension
(D B and H)
Circular ±1% with a min of ±0.5mm and maximum of ±10mm.
Ellipticals ±1% with a min of ±0.5mm (The permitted tolerance is twice the value for H<250)
±1% with a min of ±0.5mm
Thickness (T) -10%
Note: Positive deviation limited by mass tolerance
-10%
Note: Positive deviation limited by mass tolerance
Squareness of side - 90 degrees ±1 degree
External corner profile - 2T max at each corner*
(EN10210 has 3T max)
Concavity/convexity (x) - – ±1% of the side, measured independently
of the tolerance on the outside dimension
Twist (V) Ellipticals: 2mm plus 0.5mm/m max
(The permitted tolerance is twice the value for H<250)
2mm plus 0.5mm/m max.
Section is placed on a flat surface with one end held flat. At the other end the height difference of the two lower corners is taken
Mass (M) ±6% on individual lengths ±6% on individual lengths
Straightness Maximum 0.2% of the total length & 3mm over every 1m length. 
Ellipticals: The permitted tolerance is twice the value for H<250
Maximum 0.2% of total length & 3mm over every
1m length
Length +150mm/-0mm +150mm/-0mm
Out-of-roundness (O) Circular 2% for hollow sections having a diameter to thickness ratio not exceeding 100 -

* Unless shown otherwise

EN-ConstructionEngineering-Product-Tubes-Celsius-S420NH Dimensions

Dimensions

Celsius 420 is available across the size range indicated in the tables, minimum order quantities may apply. Intermediate sizes may also be available. For further information or specific requests, please contact us.

Celsius 420 is available in standard lengths from 6.0m to 14.5m for sizes up to 100/100 or 120/80 and up to 15.3m for all other sizes.

Circular hollow sections (CHS)   
mm 3.2 3.6 4 5 6.3 8 10 12.5 16
42.4                  
48.3                  
60.3                  
76.1                  
88.9                  
114.3                  
139.7                  
168.3                  
193.7                  
219.1                  
244.5                  
273                  
323.9                  
355.6                  
406.4                  
457                  
508                  

 

Square hollow sections (SHS)   
mm 3.2 3.6 4 5 6.3 8 10 12.5 16
40/40                  
50/50                  
60/60                  
70/70                  
80/80                  
90/90                  
100/100                  
120/120                  
140/140                  
150/150                  
160/160                  
180/180                  
200/200                  
250/250                  
300/300                  
350/350                  
400/400                  

 

Rectangular hollow sections (RHS)   
mm 3.2 3.6 4 5 6.3 8 10 12.5 16
50/30                  
60/40                  
80/40                  
90/50                  
100/50                  
100/60                  
120/60                  
120/80                  
150/100                  
160/80                  
200/100                  
200/120                  
200/150                  
250/100                  
250/150                  
300/100                  
300/200                  
350/150                  
350/250                  
400/200                  
400/300                  
450/250                  
500/200                  
500/300                  

EN-ConstructionEngineering-Product-Tubes-Celsius-All grades Design support

Free design support

Our team of dedicated engineers are on-hand to support engineers to make the most of our range of Celsius fully normalized hollow sections.
Email us on technicalmarketing@tatasteeleurope.com or phone on +44 (0)1536 404561 to speak to the team.

We also provide a number of free tools to make your specification of Celsius hollow sections as simple as possible:

  • Celsius design app - for quick and easy sizing of hollow sections (iOS and Android)
  • The Blue Book – the definitive guide to designing across our full range
  • Welded Joints calculation software
  • Firesoft for designing concrete-filled, fire-resistant columns
  • BIM Objects – available to download from our innovative BIM DNA Profiler