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JIS G3101 General Structure Hot Rolled SS490 Steel

What is SS490 Steels? SS490 steel is a structural hot Rolled steel in the form of plates, sheets & strips for general structural applications. SS490 is a material grade and designation defined in JIS G 3101 standard. JIS G 3101 is a Japanese material standard for hot Rolled steel plates, sheets, strips for general structural usage. The structural quality hot rolled SS490 steel is more reliable in its tensile strength than SS400 steel.

Dimensional Characteristics of SS490 Steels: The applicable thickness for this SS490 material as defined in the JIS 3101 starts from 6 mm to 120 mm.

The Chemical Composition of SS490 Steels: JIS G 3101 defines the chemical composition of SS490 steels as under:

Carbon (C) is not identified in the standard.

Manganese (Mn) is not identified in the standard.

Maximum percentage of Phosphorous (P) is 0.050 percent.

Maximum percentage of Sulphur (S) is 0.050 percent.

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

Mechanical Properties of SS490 Steels: The tensile strength of the SS490 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 245 to minimum 285 N/mm2 (MPa) depending on the thickness. The yield strength for thickness below 16 mm is minimum 285 N/mm2 (MPa) whereas for higher gauges above 100 mm is minimum 245 N/mm2 (MPa). The elongation property of SS490 steel varies with the ranges of thickness.  The minimum percentage ranges for elongation is 15% thicknesses till 16 mm, 19% for thicknesses till 40 mm, and 21% greater than 50 mm.

SPHC steel comparison with this grade of SS490 material will show how general structure hot rolled steel differs with commercial quality SPHC steel in chemical composition & mechanical properties.

Applications of this kind of steel are in making structural tubes, pipes, rods, and various structural sectional steels.


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.

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