Hot Finished Heavy Wall Mild Steel Tubing
DIN EN 10210-1 Hot finished Heavy Wall Steel Tubing of non-alloy and fine grain steels
DIN EN 10210-1
Hot finished structural hollow sections of non-alloy and fine grain steels
Part 1: Technical delivery conditions
Part 2: Tolerances, dimensions and sectional properties
TABLE 1 Permissible deviations of the product analysis from the specified limits of the cast analysis specified
|
Element |
Permissible maximum content in the cast analysis |
Permissible deviation of the product analysis from specified limits for the cast analysis |
|
C a |
≤0.20 |
﹢0.02 |
|
＞0.20 |
﹢0.03 |
|
|
Si |
≤0.60 |
﹢0.05 |
|
Mn |
Non-alloy ≤1.60 |
﹢0.10 |
|
Fine grain ≤1.70 |
﹣0.05 ﹢0.10 |
|
|
P |
Non-alloy ≤0.040 |
﹢0.010 |
|
Fine grain ≤0.035 |
﹢0.005 |
|
|
S |
Non-alloy ≤0.040 |
﹢0.010 |
|
Fine grain ≤0.030 |
﹢0.005 |
|
|
Nb |
≤0.060 |
﹢0.010 |
|
V |
≤0.20 |
﹢0.02 |
|
Ti |
≤0.03 |
﹢0.01 |
|
Cr |
≤0.30 |
﹢0.05 |
|
Ni |
≤0.80 |
﹢0.05 |
|
Mo |
≤0.10 |
﹢0.03 |
|
Cu |
≤0.35 |
﹢0.04 |
|
0.35＜Cu≤0.70 |
﹢0.07 |
|
|
N |
≤0.025 |
﹢0.002 |
|
AItotal |
≥0.020 |
﹣0.005 |
|
a For S235JRH in thicknesses ≤16mm, the permissible deviation=0.04%C,and for thicknesses＞16mm and ≤40mm the permissible deviation=0.05%C |
||
Cold forming:
Process is done at ambient temperature
Structrual hollow section manufacturing process:
Structural hollow sections are manufactured by seamless or by welding.
Welded sections manufactured by contiuous process.
Electric welded hollow sections are supplied without trimming the internal weld bead.
Non alloy steel heavy wall thickness pipe Delivery conditon:
Qualities JR, J0, J2 and K2 - Hot finished
Qualities N and NL - normalized. (normalized rolled)
- for accelerated cooling +DC
- for quenching and tempering +QT
Surface conditon:
The hollow sections have a smooth surface corresponding to the manufacturing method used; bumps, cavities or shallow longitudinal grooves resulting from the manufacturing process are permissible, provided the thickness is within tolerance.
End: Square cut
Inspection:
Chemical analysis
Mechanical tests (Tensile tests and Impact tests )
Visual inspection and dimensional check
Non-destructive testing(General Electric Welded Sections Submerged arc weled sections Retests,sorting and reprocessing)
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