What causes the rust phenomenon of JIS carbon steel SS400 CS plate

The deoxidation ability of Al is much stronger than that of Si and Mn when aluminum element (Al element) is added into steel as deoxidizer or alloying element. The main role of aluminum in JIS carbon steel SS400 CS plate etc. steel is to refine grain size and fix nitrogen in steel, so as to significantly improve the impact toughness of steel and reduce the tendency of cold brittleness and aging. Al element can also improve the corrosion resistance of steel, especially when used with molybdenum, copper, silicon, chromium and other elements. The wear resistance of chromium molybdenum steel and chromium steel can be increased by containing Al element.

The steel plate for water conservancy and power generation is used for ring seat, motor support structure, ship lock gate and discharge chute volute of large water conservancy generating units; the representative steel grades are S500Q, S550Q, SA516, etc., which require flaw detection and have Z-direction performance requirements; the main specifications are thickness of 120mm, 180mm, 200mm, 215mm, 270mm, and the maximum width is 4400mm. The representative steel grades of wind power steel plates include Q345E, Q690E, JIS carbon steel SS400 CS plate, etc.; the main specifications are thickness of 80mm, 100mm, 110mm, 120mm, 140mm, 160mm, 180mm, 200mm, 240mm, 260mm, 280mm, 300mm, and the width is more than 2500mm.

The Iranian government recently imposed new restrictions on steel exports, requiring exporters to obtain an export license issued by the Ministry of Industry, Mine and Trade before exporting. According to the latest restrictions, all Iranian steel producers must give priority to meeting domestic demand on the Iranian commodity exchange (IME) platform before being allowed to export. The new restrictions are aimed at reducing the country's JIS carbon steel SS400 CS plate and so on steel exports.