US Patent 7628869 Steel composition, articles prepared there from, and uses thereof

An article as disclosed herein comprises a steel comprising carbon in an amount greater than 0.18 weight percent and less than or equal to 0.23 weight percent by ladle analysis, wherein a test article consisting of the steel has a low temperature Charpy V-notch toughness of greater than or equal to 54 Joules when measured at −40° C. according to ASTM E23-01, and wherein a test article consisting of the steel further meets the other test requirements for S355NL steel according to European Norm EN 10 113-2:1993. In an embodiment, the article is a flange for a wind tower, and is suitable for use under extremely cold operating conditions (to −30° C.). A method for forming the flange is also disclosed.