JIS G3106 Hot Rolled for Welded Structure SM520B Steel

What is SM520B Steel? SM520B Steel is hot rolled steel for welded structure in the form of plates, sheets & strips for architecture, engineering structures. SM520B steel is a material grade and designation defined in JIS G3106 standard. JIS G3106 is a Japanese material standard for hot rolled steel for welded structure steel plates, sheets, strips for Architecture, Engineering Structures.

Dimensional Characteristics of SM520B steel: The applicable thickness for this SM520B steel material as defined in the JIS G3106, it is from 6 mm to 300 mm.

The Chemical Composition of SM520B Steels: JIS G3106 defines the percentage of chemical composition of SM520B steel steels as under:

Maximum Carbon (C) percentage is 0.20

Maximum Manganese (Mn) percentage is 1.60

Maximum percentage of Phosphorous (P) is 0.035

Maximum percentage of Sulphur (S) is 0.035

Maximum percentage of Silicon (Si) is 0.55

Remaining is iron (Fe) percentage and with few negligible impurities.



Mechanical Properties of SM520B Steels: The tensile strength of the SM520B Steels is expressed in Newton per millimeters and it must be at-least 520 N/mm2 (MPa) and maximum can be 640 N/mm2 (MPa). The yield strength is minimum 365. The elongation property of SM520B Steel varies with the ranges of thickness.  The minimum percentage range for elongation is 15.

SM490YB comparison with this grade of Steel material will show how SM520B differs with SM490YB in chemical composition & mechanical properties.


The hot rolled steel for welded structure SM520B steel is more reliable in its tensile strength than SM490YB steel.

Applications of this kind of steel are in manufacturing of heavy developments, constructions and stadiums.

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