Heat Number is an identification coupon number that is stamped on a metal plate after it is removed from the ladle and rolled at a steel mill. Industry standards requires materials to be tested at the manufacturer's and the result to be submitted through a report, also called the Mill Sheet/ Mill Certificate/ or Mill Test Certificate. A Heat Number is a unique identification code that a technician stamps on a metal plate to provide information about it's origins. Heat Number is the only way to trace a metal plate back to it's Mill Sheet, and therefore is a very important part of quality assurance and control. There may be three/ four or five segments in a Heat Number. 1) The first digit indicates which furnace is used to prepare the batch of molten metal. 2) The next two digits tells about the year of casting. 3) The next two/ three digits describes the number of casting that year by the furnace. (Batch No.) 4) Heat number can have more segments to provid...
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