The third generation of Sand hammer material made initial economic transformation

Our third-generation Sand hammer original design made of 16Mn, after a long period of use, found that there are some defects, wear faster, in order to compensate for this deficiency, now starting from hammer material, a third-generation sand making machine to make a transformation. (1) Carbon: It enables to ensure chromium, copper, vanadium carbides are formed a sufficient number, but also a certain amount of carbon dissolved in the austenite temperature to obtain a carbon supersaturated martensite, to ensure high hardness, high wear resistance and some hot hardness. (2) Cr: Cr7C3 it is formed with the carbon or (Cr, Fe) 7C3 carbide alloy having a high hardness, to increase the wear resistance of steel. (3) Nickel: Nickel and chromium coexist significantly improve the steel hardenability, and strengthen the ferrite, while also increasing the toughness. (4) molybdenum, vanadium: Except they can improve the steel hardenability and temper resistance, can still be refined grain products, improve carbide inhomogeneity, thereby enhancing the strength and toughness of the steel. (5) rare earth elements: lanthanum, cerium and other rare earth elements can be further improved oxidation resistance of chromium steel. Welding electrodes with HD-DI-60, surfacing only working part-consuming hammer rod average 1.5kg. The electrode surfacing layer containing C, Cr, W, B, Mn, Ti, Re, and other alloying elements. Surfacing layer hardness of HRC60-65, surfacing organizations plus carbide eutectic, with strong wear resistance, taken to increase the deposited layer on the welding process to ensure that the connection between the overlay and the base material of . Use hand arc welding, before welding electrode dryer at 300 degrees Celsius. Preheat the base metal at 300 degrees Celsius, in order to prevent the generation of cracks. After completion of the processing of surfacing welding hammer mounted on the third generation of Sand, hammerhead 63 days. Effect of reconstruction and economic benefits Costs for spare parts 1. The third generation of Sand former annual replacement of 30 sets of hammer, hammer spare parts cost 13,000 yuan each. After the application of welding technology, each year the third generation of Sand replacement hammer 6 sets, each hammer cost of 16,000 yuan. With the two third-generation Sand annual savings of spare parts costs about 588,000 yuan. 2. Maintenance costs 3. The third-generation Sand hammer maintenance fee to replace a set of about 4500 yuan. With the two third-generation Sand annual savings of about 216,000 yuan maintenance costs. Total savings 804,000 yuan.