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JIS G3302 Galvanized Extra Deep Drawing Cold Rolled SGCD4 Steel

What is SGCD4 Steel? SGCD4 steel is a soft non-aging extra deep drawing quality hot dip galvanized steel. SGCD4 is a material grade explained in JIS G3302 standard. The extra deep drawing quality non-aging hot dip galvanized steel is a kind of steel that is made after hot dip galvanizing a coil of SPCG cold rolled material.  This quality of non-aging extra deep drawing differs from deep drawing quality hot dip galvanized SGCD3 steel in a way that SGCD4 is more draw-able & flexible in mechanical properties.Dimensional Characteristics: The related thickness for this SGCD4 material as defined in the JIS G3302 ranges from 1.6 mm to 3.2 mm. However the width of SGCD4 material ranges to over 1600 mm.

The Chemical Composition: JIS G 3302 defines the chemical composition of SGCD4 steels as under:

Maximum percentage of Carbon (C) is 0.06 percent. This percentage range is the only difference against SGCD3 steel.

Maximum percentage of Manganese (Mn) is 0.45 percent.

Maximum percentage of Phosphorous (P) is 0.030 percent.

Maximum percentage of Sulphur (S) is 0.030 percent.

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

Mechanical Properties: The tensile strength of the SGCD4 Steels is expressed in Newton per millimeters and it must be at-least 270 N/mm2 (MPa) and the yield point is maximum 250 N/mm2 (MPa). The elongation property of SGCD4 differs with SGCD3 steel is minimum 40 to 44 percent based on thickness.  The sheet is 180 degree flat on itself. SGCD4 steel is more lasting & draw-able in mechanical properties and is not changed with time. The plastic strain ratio of SGCD4 is more good than SGCD3,

Equivalent Material Grades: ISO 3575 defines equivalent material grade as 05 special killed extra deep drawing stabilized steel and American standard A 653/A 653 M 05 implicates the equivalent material as EDDS steel.

Applications: SGCD4 Steels are mainly used in ultra-deep drawing applications which require greater functionality & draw-ability over extended period of time with unchanging or slight changing mechanical properties.


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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