... ,Q235,Q345B,20Mn STEEL..Mechanical properties1)ordinary steel :the product is made from ordinary carbon structured and high quality carbon structured steel via cold rolled ... ≥3-5%3) standard steel :the product is make from ordinary carbon structured and high quality carbon structured steel via cold-rolled.it applys ... 1", 11/4" (1.0MMX19MM, 25.4MM, 32MM) hardened&tempretured high carbon steel strip