We are working a project for structural application, we required ASTM A36 plates of 3 mm thickness, one supplier offered ASTM A1011 Type 1 Grade 36, they indicate that ASTM A36 is for plates of 5 mm and over, and A1011 is applicable for 6 mm and under, and that 3 mm thickness is considered sheet. I review ASTM A6, ASTM A36, ASTM A1011 and ASTM A568, and I don't clear up this matter, but really the chemical composition and mechanical properties are similar on both specifications. Please if somebody could give me some reference for clear up this matter.
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