[Main use of SPHC material] Hot rolled steel plate products are widely used in shipbuilding, automobile, bridge, construction, machinery, pressure vessel and other manufacturing industries due to their high strength, good toughness, easy processing and good weldability. With the maturity of new control technologies such as hot rolling dimensional accuracy, shape and surface quality and the continuous emergence of new products, hot rolled steel plates and strips have been more and more widely used and become more and more competitive in the market.