S355G7+M steel plate is mainly used in offshore construction and other projects. Due to the harsh working environment of the ship, S355G7+M steel plate is subject to chemical corrosion, electrochemical corrosion, marine biological and microbial corrosion of sea water; the hull bears large wind wave impact and alternating load; the ship shape makes its processing method complex, so the requirements for S355G7+M steel plate are strict.
First of all, good toughness of S355G7+M steel plate is the most critical requirement. In addition, S355G7+M steel plate is required to have high strength, good corrosion resistance, welding performance, processing formability and surface quality.
In order to ensure the quality and toughness of S355G7+M steel plate, the Mn / C of chemical composition is required to be above 2.5, and the carbon equivalent is also strictly required. S355G7+M steel plate is produced by a steel plant approved by the ship inspection department.
