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The EN 10210 is a European Standard prepared for Structural steel. There are various grades that come under this standard like S235, S275, S355, S420, and S460. Out of these, the commonly used grade is EN 10210 S355 grade.
This part of this European Standard specifies technical delivery conditions for hot finished hollow sections of circular, square, rectangular or elliptical forms and applies to hollow sections formed hot, with or without subsequent heat treatment, or formed cold with subsequent heat treatment to obtain
equivalent metallurgical conditions to those obtained in the hot formed product.
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Dimensional tolerances EN10210: 2006 Part 2 |
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Square/Rectangular |
Circular/Ovals |
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Outside dimension (D B and H) |
±1% with a min of ±0.5mm |
Circular ±1% with a min of ±0.5mm and maximum of ±10mm |
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Thickness (T) |
-10% Note. Positive deviation limited by mass tolerance |
-10% Note. Positive deviation limited by mass tolerance |
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Squareness of side |
90 degrees ±1 degree |
- |
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External corner profile |
2T max at each corner* (EN10210 has 3T max). |
- |
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Concavity/convexity (x) |
±1% of the side, measured independently of the tolerance on the outside dimension |
- |
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Twist (V) |
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. |
– |
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Mass (M) |
±6% on individual lengths |
±6% on individual lengths |
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Straightness |
Max 0.2% of total length & 3mm over every 1m length |
Maximum 0.2% of the total length & 3mm over every 1m length. (The permitted tolerance is twice the value for H<250) |
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Length |
+150mm/-0mm |
+150mm/-0mm |
* Excludes RHS 250 x 200, which is 3T max at each corner in line with EN10210
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EN10210 CHS-Circular hollow sections – length and tolerances |
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Outside Diameter |
Welded |
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mm |
Thickness mm |
Standard mill lengths m |
Special mill lengths m* |
Tolerance mm |
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21.3 – 42.4 |
All |
6.0, 6.4, 7.5 |
5.4 – 7.5 |
+150-0 |
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48.3 |
All |
6.0, 6.4, 7.5 & 10.0 |
5.4 – 14.6 |
+150-0 |
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60.3 – 114.3 |
All |
6.0, 6.4, 7.5 & 10.0 |
5.0 – 14.6 |
+150-0 |
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139.7 |
All |
7.5 & 10.0 |
6.0 – 14.5 |
+150-0 |
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168.3 – 193.7 |
All |
7.5, 10.0 & 12.0 |
6.0 – 14.6 |
+150-0 |
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219.1 – 508.0 |
All |
10.0 & 12.0 |
6.0 – 14.6 |
+150-0 |
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Chemical Composition for Hot Finished Circular Hollow Section |
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Chemical composition – ladle analysis |
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Hot Finished Circular Hollow Section |
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Specification |
EN10210 S355J2H Part 1: 2006 |
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% max |
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Carbon |
0.22 |
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Silicon |
0.55 |
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Manganese |
1.60 |
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Sulphur |
0.030 |
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Phosphorus |
0.030 |
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Carbon equivalent (CEV) mat T≤16mm |
0.45 |
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Type of deoxidation |
Fully killed steel |
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Mechanical Properties for Hot Finished Circular Hollow Section |
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Specification |
EN10210 S355J2H Part 1: 2006 |
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Tensile Strength Rm N/mm2: 3 ≤ T ≤ 100mm |
470 – 630 |
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Yield Strength ReH Min, N/mm2: T ≤ 16mm |
355 |
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Min Elongation % T ≤ 40mm on gauge length 5.65. √S0 |
22 |
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Impact properties Minimum Ave energy (J) at -20°C |
27 |
