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JIS G3106 Hot Rolled for Welded Structure SM490A Steel

SM490A Steel is a material designation defined in JIS G3106 standard, SM490A Steel is a Hot Rolled Steel for Welded Structure.

What is SM490A Steel?           

SM490A Steel is hot rolled steel for welded structure in the form of plates, sheets & strips for architecture, engineering structures. SM490A 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.

The hot rolled steel for welded structure SM490A steel is more reliable in its tensile strength than SM400A steel.

Dimensional Characteristics of SM490A steel:

The applicable thickness for this SM490A steel material as defined in the JIS G3106, it is from 6 mm to 300 mm.

The Chemical Composition of SM490A Steels:

JIS G3106 defines the percentage of chemical composition of SM490A steels as under:

Maximum Carbon (C) percentage is 0.20.

Maximum Manganese (Mn) percentage is 1.65.

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 SM490A Steels:

The tensile strength of the SM490A Steels is expressed in Newton per millimeters and it must be at-least 490 N/mm2 (MPa) and maximum can be 610 N/mm2 (MPa). The yield strength is minimum 325. The elongation property of SM490A Steel varies with the ranges of thickness.  The minimum percentage range for elongation is 17.

SM400A comparison with this grade of SM490A Steel material will show how SM490A differs with SM400A in chemical composition & mechanical properties.


Applications of this kind of steel are in plant manufacturing, and heavy machinery structures. 


Engineer Ali Alvi is an industrial engineer who has post graduated from the NED University, then completed his Masters in Industrial Engineering from the University of Ontario. He has also served as an engineer in International Steel Ltd as A Cold rolling mill engineer.

  1. Rizwan Hameed says:

    14nicrmo13-4 i need this grade equivalent to Japnes internation standards (JIS) which grade is equivalent to 14nicrmo13-4.
    Please comment.

    1. Andrew says:

      UNS Grade H93100 is said to be its equivalent

  2. rajan debnath says:

    what is main difference sm490ya steel & sm490a steel.

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