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A heat number is an identification coupon number that is stamped on a material plate after it is removed from the ladle and rolled at a steel mill. Industry quality standards require materials to be tested at the manufacturer and the results of these tests be submitted through a report, also called a Mill Sheet, Mill Certificate or Mill Test Certificate (MTC). The only way to trace a steel plate back to its Mill Sheet is the Heat Number. A heat number is similar to a lot number, which is used to identify production runs of any other product for quality control purposes. ==Numerical significance== Usually, but not universally, the numbers indicate: *the first digit corresponds to the furnace number *the second digit indicates the year in which the material was melted *the last three (and sometimes four) indicate the melt number. *Example like 74277, the "7" indicated furnace number, "4" indicated Years of Melted Metals, and The last three is Melt number 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Heat number」の詳細全文を読む スポンサード リンク
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