S355 is a structural steel grade with a minimum yield strength of 355 Mpa and has 1.0–1.6% Mn. R260 is a rail steel grade with a
tensile strength of 700–900 Mpa, 0.6–0.8% C and 0.8–1.3% Mn. It is prone to martensitic formation during welding due to its higher
Carbon content. Carbon Equivalent (CE) for R260 is 0.8–1.0 and for S355, 0.4–0.5.
E7018-1 (AWS A5.1) with a 1.0–1.6% Mn suits R260 which has a higher Mn. Alternatively, E8018-G or E10018-D2 provide enhanced
strength and toughness. Preheat R 260 to 200–250°C and possibly PWHT (600-6500C) may be required depending on its thickness
and critical applications. Ensure proper joint design to manage stress. Qualify a procedure as per relevant codes.
C Sridhar.
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When welding EN 10025 S355 steel (a structural steel) and rail steel (e.g., R260 or similar grades like 71 Mn)
With Regards
Anish R Kurup--On Tue, 10 Jun, 2025, 10:29 pm sridhar cn, <sridharcn305@gmail.com> wrote:S355 is a medium-strength structural steel, and think the rail has 0.4–0.8% Carbon. The 70mm thick rail requires preheating to 250–300°C toreduce thermal stresses and prevent hydrogen cracking. Post-weld heat treatment (PWHT) may also be needed depending on the rail grade.E7018 (3.2mm or 4.0mm) is suitable as the first choice. Alternatively, consider E8018-C1 for better toughness and it has better compatibilitycompared to E 7018 due to its Nickel addition .C Sridhar.--On Tue, 10 Jun 2025 at 20:57, sriram Srinivasan <mail2ram40@gmail.com> wrote:--Hi gentlemanWhat is electrode need to use welding EN100025 S355 and rail 71 mnPlease guide me
Regards,
Sriram Srinivasan
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