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A 653/A 653M-05 Galvanized Deep Drawing Cold Rolled DDS type C Steel

What is DDS type C Steel?  The American Standard for hot dip Galvanized Cold Rolled Materials A 653/A 653M-05 identifies deep drawing aluminum killed quality galvanized cold rolled hot dip galvanized steels with designations: DDS type C steel. DDS stands for ‘deep drawing quality steel’.  Deep drawing steel DDS type C steel is more draw-able that FS type A & B steel & DDS type A steel. DDS type C steel is for sure stabilized steel whereas DDS type A depends on customer requirement of stabilization.

The Chemical Composition: DDS type C is composed of maximum 0.02 percent of Carbon, maximum 0.5 percent Manganese, maximum 0.02 to minimum 0.1 percent Phosphorous, & maximum 0.025 percent Sulphur. Remaining is Iron with other impurities. Minimum percentage of Aluminum is 0.1 percent. Zinc is coated on this composition of base steel.

Mechanical Properties:

The yield strength ranges from 170 to 280 MPa of the above material designation. The elongation of these materials is greater than or equal to 32 percent.  

The equivalent materials are defined in JIS standard as SGCD3 steel and International standard is 04 deep drawing steel.


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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