Recently, the widest 7Ni steel sheet with the thickness of 5mm and the width of 3400mm was successfully rolled out in Ansteel 4300mm Heavy Plate Line. As a new generation of nickel-saving type structural steel under ultra-low temperature to replace 9Ni steel, the content of Ni in 7Ni steel is down by more than 20%, sharply reducing production cost. In 2020, Ansteel Group developed double-layer pack rolling technology by itself, breaking through the rolling specification limit of medium and heavy plate mills. This also provides important supports for the R&D and industrial production of 7Ni steel and other wide and thin plates. At the moment, Ansteel Group has successfully developed 5mm-60mm through-thickness 7Ni plates ranging from ultra-thin to ultra-wide ones, up to or exceeding the performance of 9Ni steel.