MICRO-ALLOY STEEL COMPOSITION WITH IMPROVED MECHANICAL PROPERTIES

摘要

The invention particularly relates to a micro alloy steel composition comprising; carbon (C) in a ratio of 0.15 - 0.2 % by weight, nitrogen (N) in a ratio of 0.007 % maximum by weight, silicon (Si) in a ratio of 0.25 % maximum by weight, manganese (Mn) in a ratio of 1.1 % maximum by weight, chromium (Cr) in a ratio of 0.6 % maximum by weight, molybdenum (Mo) in a ratio of 0.1 % maximum by weight, nickel (Ni) in a ratio of 0.1% maximum by weight, vanadium (V) in a ratio of 0.15 % maximum by weight, aluminum (Al) in a ratio of 0.05 - 0.15 % by weight, phosphorus (P) in a ratio of 0.03 % maximum by weight, sulphur (S) in a ratio of 0.03 % maximum by weight and copper (Cu) in a ratio of 0.25 % maximum by weight with yield strength of 475 - 550 MPa and tensile strength of 680 - 720 MPa.