規格番号：ASTM A568/A568M
タイトル：Standard Specification for Steel, Sheet, Carbon, Structural, and High-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled, General Requirements for
鋼・シート・炭素・構造・高強度・低合金・熱間圧延・冷間圧延の一般仕様
http://www.astm.org/cgi-bin/resolver.cgi?A568A568M