Structural hollow sections Celsius® hot finished hollow sections

Celsius® hot finished hollow sections

Our innovative Celsius® range combines proven performance with complete reliability of a true hot finished hollow section to EN 10210.

Celsius® offers stronger, lighter, more cost-effective and aesthetically pleasing structures to help meet and exceed the most demanding and challenging applications. Available in a wide range of circular, square, rectangular and elliptical hollow sections. The strength and weldable qualities of Celsius® mean that it can be used for all structural and mechanical applications, including multi-storey columns, space frames, lattice beams and frames for machinery & trailers.

Made exclusively from normalized, fine grain steel the Celsius® range is fully stress-relieved with uniform mechanical properties and improved weldability thanks to a low Carbon Equivalent Value (CEV) while the controlled silicon content ensures good galvanisability.

Alongside the popular S355NH grade, we also manufacture Celsius® fully normalized hot finished hollow sections in high strength S420NH and S460NH to bring the advantages of Celsius® into a new age of light-weight, sustainable structures.

We also offer Celsius® in a weathering grade variant to provide ultimate durability in long-life, low-maintenance structures.

Celsius® hot finished hollow sections Celsius S355NH

  • Fully normalized structural hollow sections, compliant with EN 10210:S355NH
  • Normalized fine grain steel, so free of internal stresses and with a minimum strength of 355N/mm2 allowing the highest fabrication factors and enabling material cost savings and lighter structures
  • Supplied normalized and compliant to both ‘NH’ and ‘J2H’ classifications
  • Available in a wide size range of 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), elliptical (300 x 150 x 8mm to 500 x 250 x 16mm) and circular (42.4 x 3.2mm to 508 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® S355NH, and supplied with a 3.1 test certificate for the reassurance of batch traceability
  • Full technical support available
  • Excellent supply availability through approved stockholders

High strength hot finished hollow sections suitable for all construction and mechanical applications. Celsius® 355 is suitable for all internal and external applications to BS5950-1:2000, EN1993 and BS5400.

Celsius® 355 hollow sections are supplied with a minimum yield strength of 355 N/mmand comply fully with the European Standard for hot finished structural hollow sections, EN10210:S355NH.

Yield strength;
ReHmin N/mm2;
Tensile strength;
RmN/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  
355 470-630 22 -20 40 0.43

Chemical composition % by mass

C max Si max Mn P max S max Nb max V ma Al total min Ti max Cr max Ni max Mo max Cu max N max
0.20 0.50 0.90
1.65
0.035 0.030 0.050 0.12 0.020 0.03 0.30 0.50 0.10 0.35 0.020

Celsius® 355 is produced from fully-killed steel – critical to formability and weldability.

Inspection and testing
Celsius® hollow sections EN10210:S355NH are subject to specific inspection and testing and are supplied with an inspection certificate type 3.1 to EN10204.

Dimensional tolerances EN10210: Part 2

Celsius S355NH is 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

Celsius S355NH 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 S355NH 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 4.0 5.0 6.3 8.0 10.0 12.5 16.0
42.4                  
48.3                  
60.3                  
76.1                  
88.9                  
114.3                  
139.7                  
168.3                  
193.7                  
219.1                  
244.5                  
273.0                  
323.9                  
355.6                  
406.4                  
457.0                  
508.0                  
Square hollow sections (SHS)   
mm 3.2 3.6 4.0 5.0 6.3 8.0 10.0 12.5 16.0
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 4.0 5.0 6.3 8.0 10.0 12.5 16.0
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                  
Elliptical hollow sections (EHS)   
mm 8.0 10.0 12.5 16.0
300/150        
400/200        
500/250        

Celsius S355NH is manufactured and CE marked according to EN 10210-1&2:2006 grade S355NH.

All Celsius products are manufactured under Factory Production Control conditions and FPC certification is available upon request. The full Declaration of Performance for all of our Celsius range can be downloaded from our DoP download centre.

Our team of dedicated engineers are on-hand to support engineers to make the most of our range of Celsius fully normalized hollow sections. Use the live chat, 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

Product Downloads

Please Register or  to gain access to locked downloads.

Celsius® 355 NH technical guide image.jpg



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