Protective steel plate with excellent cold-bend processing performance and method for manufacturing same

A protective steel plate with cold roll formability, comprising:

• three soft steel layers and two hard steel layers, wherein the three soft steel layers and the two hard steel layers are positioned alternately, and face layers of the protective steel plate are soft steel layers, wherein the hard steel layers and the soft steel layers are atomically bonded by rolling cladding;
• wherein the protective steel plate can pass transverse cold roll forming of clad steel plate d=1a, 180°, wherein the soft steel layers have a hardness value of less than 110 Hv, and the hard steel layers have a hardness of greater than 600 HBW;
• wherein the soft steel layers consist of chemical elements in percentage by mass of:
• C:
• 0.001-0.01%, 0<Si≤0.005%, Mn:
• 0.05-0.15%, 0<Al≤0.005%, Ti:
• 0.01-0.10%, with a balance of Fe and unavoidable impurities, and wherein the hard steel layers consist of chemical elements in percentages by mass of:
• C:
• 0.40-0.50%, Si:
• 0.1-0.3%, Mn:
• 1.0-1.5%, Al:
• 0.01-0.05%, Cr:
• 0.1-0.3%, Ni:
• 0.1-0.3%, Ti:
• 0.01-0.03%, B:
• 0.001-0.003%, Mo:
• 0.1-0.5%, and a balance of Fe and unavoidable impurities, and
• wherein the protective steel plate has a thickness of 3-20 mm.