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JIS G3302 Structural Galvanized Cold Rolled SGC340 Steel

What is SGC340 Steels? SGC340 steel is a structural hot dip galvanized cold rolled steel in the form of plates, sheets & strips for structural usages. SGC340 is a material grade and designation defined in JIS G3302 standard. JIS G3302 is a Japanese material standard for Galvanized steel plates, sheets, strips for structural usage.Dimensional Characteristics of SGC340 Steels: The applicable thickness for this SGC340 material as defined in the JIS 3302 starts from 1.6 mm to 3.2 mm. However the width of SGC340 material ranges to 950 to 2000 mm.

The Chemical Composition of SGC340 Steels: JIS G 3302 defines the chemical composition of SGC340 steels as under:

Carbon (C) is maximum 0.25 percent in the standard.

Manganese (Mn) is maximum 1.7 percent in the standard.

Maximum percentage of Phosphorous (P) is 0.20 percent.

Maximum percentage of Sulphur (S) is 0.050 percent.

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

Mechanical Properties of SGC340 Steels: The tensile strength of the SGC340 Steels is expressed in Newton per millimeters and it must be at-least 340 N/mm2 (MPa). The yield strength is minimum 245 N/mm2 (MPa). The elongation property of SGC340 steel varies with the ranges of thickness.  The minimum percentage ranges for elongation is 20 minimum.

Applications of SGC340: SGC340 steel can be used for structures in industries. Different types of structural profiles can be erected by the usage of this kind of steel.  Round bar steel of SGC340 steel is available from 1mm to 2000mm, Square-shape steel available from 10mm to 1000mm.    This material can be used in Turning, Milling, Grinding, Deep hole drilling etc. Sinusoidal profiles, clip lock and screw down profiles are also made from this type of steel.

SGCC is a commercial quality material defined in JIS G3302, this material can be compared with its mechanical properties & chemical composition by SGC340 steel. SAPH310 Steel is a hot rolled structural quality steel & can be used as a reference for comparison.


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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