The surface for B type wear plate and wear ring are welded by L tungsten carbide rings, we call it "7" shape also. Tungsten carbide thickness is 7mm, width is 25-27mm.Inside sleeve is welded by V-150 electrode. L shape wear plate and wear ring, HRA is 86°, HRC is 62°, the tensile strength is 2500N/mm2. Life time of wear plate is more than 50K CBM,life time of wear ring is more than 30K CBM.