The common misconception is that steel is steel is steel - not true. US made steel adheres to the tightest tolerances allowable for any given grade the world over. Simply put it's as good as anything else out there - you know what you're buying and you know what you're getting. You might be able to imagine where this is critical to engineered assumptions.
Sorry, but not correct!95% of US steel is sold with ASTM standards which were set up 60 years ago! You can drive a truck thru these tolerances! Best mills in the world are in Korea, Japan, Australia, and some in China! The US has some Great new mills, such as the new THYSSEN/KRUPP mill in Alabama, which by the way, is owned by Th Germans. Most of the US mills are OLD!