When manufacturing all grades of ship steel plates, we do different heat treatments on different grades and different thickness.
Plates in all thicknesses ordered to Grades CS and E shall be normalized.
Plates over 35 mm in thickness ordered to Grade D shall be normalized. When Grade D steel is furnished semi-killed, it shall be normalized over 25 mm in thickness. Upon agreement between the purchaser and the manufacturer, control rolling of Grade D steel may be substituted for normalizing, in which case impact tests are required for each 25 tons [25 Mg] of material in the heat.
Plates in all thicknesses ordered to Grades EH32 and EH36 shall be normalized.
Grades AH32, AH36, DH32, and DH36 shall be normalized when so specified. Upon agreement between the purchaser and the manufacturer, control rolling of Grade DH may be substituted for normalizing, in which case impact tests are required on each plate.
In the case of shapes, the thicknesses referred to are those of the flange.
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