S355M Fine-grain structural steels,thermomechanically-rolled

355M Fine-grain structural steels,thermomechanically-rolled

Matreial number:108823

Analogic:DIN EN 10025-4

Tensile strength class:B

1.S355M’s usage

The series of thermomechanically-rolled fine-grain structural steels S355M is characterised by a minimum

yield strength of 275-460 N/mm2,by good weldability and high resistance to brittle cracking.They

are used above all for highly stressed welded structures in the construction of bridges and steel structures.

2.S355M’s chemical composition

Grade	C max	Si max	Mn max	P max	S max	N max	AL min	Nb max	V max	Ti max	Cr max	Ni max	Mo max	Cu max	Ce min
S355M	0.14%	0.50%	1.60%	0.035%	0.03%	0.015%	0.02%	0.05%	0.10%	0.05%	0.30%	0.30%	0.20%	0.55%	0.39%

3.S355M mechanical properties

The tensile test value of S355M is 470 to 630 Mpa and its total elongation is ≥22%.

The yield strength of S355M is ≥355Mpa when the thickness is ≤16mm,on the contraty when S355M’s thickness is >16mm,S355M’s yield strength is ≥345Mpa.

4.Welding

The sine-grain structural steel grades of S355M this series can be perfectly welded both manually and using automatic equipment by means of all known welding processing,not least due to their reduced carbon content and the low carbon equivalent value.In genaral,pre-heating prior to wealding is not necessary due to the low tendency to cold-cracking.However,thequality of the weld joint depends on the welding process,the welding conditions and the selection of the correct filler metals.Gas welding should not be used.

The welding wires and electrodes approved in this strength category must be used as filler metals.Basic coated electrodes are recommended for manual welding.And these fine-grain structural steel grades are not suitable for heat treatment above 580℃.Stress relief annealing(530-580℃)is required only if called for in the regulations or if manufacturing conditions make a reduction of the residual welding stresses appear useful.The holding time should be between 30 and 60 minutes.

5.Condition of delivery,scope of testing and certificate of S355M

The provisions of EN 10025-4 S355M shall apply for delivery and inspection.The products S355M are themomechanically-rolled and we can delivery the products according to your requirements.What’s more our divery time in generally 20 to 40 days.

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