Wear plate and its preparation method has a low crack sensitivity index and high strength

The present invention discloses a method of preparing a wear-resistant steel sheet and a low crack sensitivity index and having high strength, wear resistant steel the chemical composition of the following composition by weight percent: C: 0.10-0.17%, Si: 0.25 -0.55%, Mn: 0.60-0.90%, P≤0.015%, S≤0.005%, Nb: 0.01-0.040%, Ti: 0.010-0.030%, Ni: 0-0.30%, Cr: 0.020-0.050%, Mo : 0.20-0.40%, B: 0.0005-0.0030%, Al: 0.010-0.050%, the balance being Fe and unavoidable impurities. Low carbon content of the wear-resistant steel, the welding performance, less precious metal content of the added low cost; the abrasion resistant steel weld cracking parameter (Pcm of) 0.30%, and Brinell hardness HBW430-470, can be achieved NM450 level of wear-resistant steel, to meet the requirements for welding related applications industries NM450 wear resistant steel.