Bridge thickness of a low compression ratio Laid anchor pad plate and production method thereof

The present invention discloses a low compression ratio Laid anchor pad thickness bridge plate, its thickness is 160-190mm, a compression ratio of 1.58-1.87, its chemical composition by weight percent of C: 0.14-0.18%, Si: 0.33-0.5%, Mn: 1.25-1.55%, P: ≤0.012%, S: ≤0.004%, Nb≤0.03-0.06%, V: 0.035-0.055%, Ni: 0.35-0.55%, N≤0.008, Als : 0.015-0.04%, the balance being Fe and inevitable impurities; carbon equivalent ≤0.45. The present invention also discloses a method for producing the steel sheet, including smelting, the LF RH refining furnace and continuous casting into a billet, hot rolling the first, the second hot rolling, slow cooling steps. The present invention bridges the anchor pad ≥360MPa yield strength of the steel sheet, the tensile strength ≥500MPa, elongation ≥25%, - 20 ℃ impact energy ≥160J, while an inspection pass, while Z stretching section shrinkage can be achieved Z25 level, -40 ℃ Charpy (V-notch) at least 100J.