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ISO 3573 Deep Drawing Quality Hot Rolled HR3 & HR4 Steels

What is HR3 & HR4 Steels: The international standard organization defines deep drawing quality hot rolled material designation as HR3 & HR4 grades. HR3 being simple deep draw quality and HR4 as Deep drawing quality aluminum killed. Steel which has been de-oxidized with aluminum adequately to avert the evolution of gas during solidification is known as aluminum killed steel.

 Chemical Composition of HR3 Steels: The chemical composition of HR3 Steels is defined below:

The maximum percentage of Carbon is 0.08.

The maximum percentage of Manganese is 0.40.

The maximum percentage of Phosphorous is 0.03.

The maximum percentage of Sulphur is 0.03.

Rest material percentage is of iron.

Mechanical Properties of HR3 Steels: The tensile strength of HR3 steels is 400 MPa. The Elongation range is in between 28-34 percent. These steels can be drawn more as compare to HR 2 steels and the mechanical properties are more suitable for drawing applications.

Chemical Composition of HR4 Steels: The chemical composition of HR4 Steels is defined below:

The maximum percentage of Carbon is 0.08.

The maximum percentage of Manganese is 0.35.

The maximum percentage of Phosphorous is 0.025.

The maximum percentage of Sulphur is 0.03.

Rest material percentage is of iron.

Mechanical Properties of HR4 Steels: The tensile strength of HR4 steels is 380 MPa. The Elongation range is in between 31-37 percent. These steels can be drawn more as compare to HR 3 steels and the mechanical properties are more suitable for drawing applications.

HR4 & HR3 steels have equivalent material grade which is defined in JIS standard. The commercial quality HR1 steels can also provide a reference for comparison.

About

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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