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ASTM A 1011/A 1011M-07 Drawing Quality Hot Rolled DS type A & B Steels

There are two types of drawing quality hot rolled steels defined by the American standard, these are DS type A and DS type B steels.

Chemical Composition of DS Type A Material: The drawing quality hot rolled steel has chemical composition as defined below:

Maximum Carbon content is 0.08 % of this type of steel.Maximum Manganese percentage is 0.5 %.

Maximum Phosphorous is 0.02 %.

Maximum Silica is 0.03 %.

Maximum Aluminum is 0.01 %.

Rest percentage is of iron.

Chemical Composition of DS Type B Material: Only the lower limit of Carbon is defined in this type of material i.e. 0.02% and the upper limit is 0.08%. Remaining chemical content maximum percentage limit is same as DS type A material.

Mechanical Properties of DS Type A & B Steels: The range of mechanical properties for DS type A & B steels is defined similarly as one designation, despite slight variation. The minimum elongation required is 28 % where as the yield strength is 205-310 MPa. The American Standard unlikely the Japanese & International standard focuses on yield strength rather tensile strength, since the plastic region is equally important for such materials.

Learn more about this type of material in equivalent standards of JIS & ISO.


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. J Gambill says:

    How long can tubing made from ASTM A1011 DS A sit before aging sets in to the point the material may crack while being bent.

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