pdf (3.6 MB) - ThyssenKrupp Bautechnik

2.2. PROPERTIES OF STEEL 9
Table 2.1: Steel grades for hot-rolled steel sheet piles and their characteristic mechanical properties
to DIN EN 10248-1
Steel grade Min. tensile strength Min. yield strength Min. elongation at failure
fu[N/mm 2 ] fy [N/mm 2 ] εu[%]
S 240 GP 340 240 26
S 270 GP 410 270 24
S 320 GP 440 320 23
S 355 GP 480 355 22
S 390 GP 490 390 20
S 430 GP 510 430 19
The characteristic mechanical properties of cold-worked steel sheet piles according to DIN
EN 10249-1 are shown in table 2.2. These sheet piles are used, for example, when a lightweight
section is required or for trench sheeting.
Table 2.2: Steel grades for cold-worked steel sheet piles and their characteristic mechanical
properties to DIN EN 10249-1
Steel grade Min. tensile strength Min. yield strength Min. elongation at failure
fu[N/mm 2 ] fyb [N/mm 2 ] εu[%]
S 235 JR 340 235 26
S 275 JR 410 275 22
S 355 JOC 490 355 22
2.2.3 Suitability for welding
Welding involves fusing together two identical or very similar steels to form one homogenous
component, and this is done by melting them together at their interface through liquefaction or
plastic deformation. This can be carried out with or without the addition of another material.
Arc welding is a very common method (manual metal-arc welding, shielded metal-arc welding).
In this method an electric arc is generated between an electrode, which supplies the welding
material, and the component. The suitability for welding depends not only on the material, but
also on its shape, the dimensions and the fabrication conditions. Killed steels should generally
be preferred.
According to EAU 2004 section 8.1.6.4 (R 67), and taking into account general welding specifications,
arc welding can be used for all the grades of steel used for sheet piles. The building
authority approvals must be adhered to for high-strength steel grades S 390 GP and S 430 GP.
In addition, the carbon equivalent CEV should not exceed the value for steel grade S 355 to
DIN EN 10025 table 4 if welding is to be employed.
Furthermore, EAU 2004 section 8.1.6.4 (R 67) recommends using fully killed steels of the