Bimetal crushing cutter tooth and manufacturing process thereof

The double-metal crushing cutter tooth comprises a hammer head, a handle I and a handle II, wherein the hammer head and the first handle are made of the same metal material and comprise, by mass, 0.70%-1.2% of C, 6.4%-8.2% of Cr, 1.8%-3.2% of Mo, 1.3%-2.0% of V, 0.5%-1.1% of Si, 0.2%-0.7% of Mn, 0.02%-0.06% of Ni and the balance Fe and impurities, and S in the impurities is smaller than or equal to 0.035%, and P in the impurities is smaller than or equal to 0.035%; the second handle comprises, by mass, 0.1%-0.3% of C, 10%-15% of Cr, 0.5%-1.2% of Ni, smaller than or equal to 1.2% of Si, 0.7%-1.2% of Mn and the balance Fe and impurities, and S in the impurities is smaller than or equal to 0.03%, and P in the impurities is smaller than or equal to 0.03%; the depth of a hardening layer of the hammer head is larger than or equal to 30 mm, and the hardness of the hardening layer reaches HRC 60-63. The manufacturing process of the bimetallic crushing cutter tooth comprises the following steps: S1, high-temperature f