Line pipes EN 10255

These pipes are most often used to build water, gas and ventilation systems, both in residential and industrial buildings. Pipes made according to EN 10255 are suitable for threading and welding.

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Non-alloy steel tubes suitable for welding and threading

Steel grade: S195T


Manufacturing process

Tubes should be produced as seamless (S) or welded (W).


Series (M – medium, H – heavy) and types (L or L1 or L2) – designation used in combination with diameter determines the wall thickness and weight per length unit


Tolerance of the wall thickness for welded tubes:
± 10 % for M and H series or L type;
– 8 % + limited by weight tolerance for L1 and L2 types.

Weight tolerance for welded tubes:
± 7,5 % for bundles ≥ 10 t, for M and H series and L type;
+ 10 % / – 8 % for each tube L1 and L2 type.

Lengths and tolerances (welded tubes)

standard 6 m or 6,4 m: + 150 mm / – 50 mm
random 4 m ≤ L ≤ 16 m with the range 2 m for order: up to 10 % of the tubes provided may be less than the length ordered, but not less than 75 % of the minimum length
L ≤ 6 m: + 10 mm
6 < L ≤ 12: + 15 mm L > 12: + upon agreement


For tubes with outside diameter ≥ 33,7 mm deviation of straigthness should be less than 0,002 L for each tube (L = length of the tube).


Tubes should be subject to water testing or electromagnetic testing.


At least:
– producer;
– serie (H or M) or type (L, L1 or L2);
– S (for seamless) or W (for welded).