Protective composite steel plate and method for manufacturing same

A protective clad steel plate, comprising:

• hard and soft steel layers arranged alternately, wherein face layers of the protective clad steel plate are hard steel layers, wherein the hard steel layer and the soft steel layer are atomically bonded by rolling cladding;
• wherein the soft steel layer consists of chemical elements in percentage by mass of:
• C:
• 0.001-0.01%, O<Si≤0.005%, Mn:
• 0.05-0.15%, 0<Al≤005%, Ti:
• 0.01-0.10%, with a balance of Fe and unavoidable impurities, and wherein the hard steel layer consists 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:
• 0.05-0.5%, and a balance of Fe and unavoidable impurities;
• wherein the soft steel layer has a hardness of no more than 90 Hv, and the hard steel layer has a hardness of greater than 600 HBW.