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Hi PD's - again Anthony, iron is produced in a blast furnace & has highly variable levels of carbon & other elements in the order of 0.002 to 0.2 to 2.0% variance viz the total 100% blend/mixSteel by secondary processes is the refined product which can be rolled into sheet that forms our tin cans or bonnet panels of our cars & as used on our early paddlers I am involved in the steel industry under contract [24/7 ] but am not a metalurgist, so please my comments are only to understand the differientation as a 3/16" section of cast IRON would be very brittle as compared to a refined & rolled 3/16" thick steel plate - literally like chalk & cheese............Derek -------------------- m2f --------------------Exported by Paddleducks Mail System.http://www.paddleducks.co.uk/forum/viewtopic.php?p=9360#9360-------------------- m2f --------------------