Grate plate of pellet traveling grate and preparation method thereof

Abstract

A grate plate of a pellet traveling grate and a preparation method thereof relate to a structural technology of the grate plate of the traveling grate in the iron and steel smelting pellet technology. The preparation method comprises the following steps: hot-melting the alloy formed by C, Si, Mn, Cr, Mo, W, Ni, Al, V, P and S elements, pouring in the casting box formed by moulding sand, curing agent, silane and resin, cooling, demoulding, quenching at 1000-1100 DEG C, and finally tempering to prepare the grate plate of the pellet traveling grate, wherein the plate body of the grate plate is provided with at least two rows of long through-holes, and the through-holes at the four corners of the plate body are provided with connection ribs which are vertical to the length direction of the through-holes. Therefore, the fracture resistance, fatigue resistance, oxidation resistance, heat resistance and wear resistance of the product are enhanced, the expansion coefficient is reasonable, and the service life is up to 16-18 months. As the grate plate of the invention has good overall performance, needs a little repair and saves the raw material, the labor intensity of users and the production cost are significantly reduced so as to realize efficient, energy-saving and environmentally friendly production.

Description

Technical field [0001] The invention relates to a structural technology of a grate plate used in a steel smelting pelletizing process. Background technique [0002] The pellet grate machine grate plate undergoes repeated thermal cycles in a working environment of 200°C to 1050°C (the cycle is 50 cycles / 24 hours). Therefore, the thermal fatigue performance of the pellet grate machine grate plate is extremely high, and the Its high temperature wear resistance, oxidation resistance, expansion coefficient and thermal stress have strict requirements. Although some domestic manufacturers are currently changing the geometric structure or material of the grate plate of the chain grate machine, or using lost foam manufacturing, or using laser shock strengthening technology and "QPQ" salt bath composite treatment and laser cladding and other technologies, they cannot solve the grate plate problem. In repeated thermal cycle conditions of 200°C to 1050°C, thermal cracks and material ox...

AI Technical Summary

Problems solved by technology

Although some domestic manufacturers currently change the geometric structure or material of the grate plate of the chain grate, or use lost foam manufacturing, or use laser shock strengthening technology, "QPQ" salt bath composite treatment and laser cladding and other technologies, they cannot solve the problem of the grate plate. Under the condition of repeated thermal cycle at 200℃~1050℃, it is very easy to produce thermal cracks and material oxidation defects

The thermal cracks continue to expand under the action of further thermal stress, eventually causing the grate plate to break; and the material oxidation eventually leads to the change of the geometric size of the grate plate, which is easy to leak iron shot or impurities, causing the grate machine to be stuck or shut down

The above-mentioned defects of the grate plate also directly lead to the short service life of the grate plate

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