Deposit welding rod containing rare earth and production method

Abstract

The invention provides a surfacing electrode containing rare earths with a welding core but without a coating. The composition of the welding core is 3.2% to 6.5% of C, 0.4% to 2.5% of Si, 0.4% to 2.0% of Mn, 0.01% to 1.0% of Re, 10% to 35% of Cr, 0.0% to 2.0% of Mo, 0.0% to 2.8% of Ni, 0.0% to 2.5% of W, 0.0% to 1.5% of V, 0.0% to 1.0% of Ti, 0.0% to 1.5% of Nb, 0.0% to 0.5% of Cu, 0.0% to 0.6% of Al, not more than 0.08% of S, not more than 0.08% of P, not more than 0.08% of , not more than 0.08% of <N>, and 59.64% to 85.99% of Fe. The welding rod is suitable for the build-up welding of burning single-roll crusher hammer; the hardness HRC of the build-up welding layer at room temperature is not less than 50 and crack is allowable for build-up welding layer.

Description

technical field [0001] The invention relates to a surfacing welding electrode for a sintering single-roll crusher hammer and a production method. Background technique [0002] The sintering machine is mainly used in the iron and steel metallurgical industry. Its function is to sinter to obtain sinter. It is the first process of blast furnace ironmaking. After sintering, the sintered ore falling from the tail of the sintering machine must be crushed and screened to make the ore have a uniform particle size before entering the blast furnace for smelting. The sintered ore crushed in my country adopts a primary crushing process, and the equipment used is a single-roller crusher. The crushed sinter must be screened to remove the oversized or undersized sintered ore outside the required particle size range, among which the undersized ore is re-sintered, while the oversized ore is re-broken. The single-roll crusher is composed of a star wheel, a shaft roller, a fixed grate and a tr...

AI Technical Summary

Problems solved by technology

Integral casting hammer body (commonly used such as high manganese steel hammer body) has poor compactness due to defects such as shrinkage cavity and segregation inside the casting, which reduces the wear resistance of the hammer body; the hammer body manufactured by surfacing welding technology is very dense, There are fewer defects than casting, and its service life is longer than that of cast hammers when the composition is the same. At the same time, it is easier to produce high-quality hammers by surfacing welding. At present, electrodes with coatings are used, and all the hammers are obtained mainly through the transition of coatings. The required ingredients, the ingredients mainly contain C, Si, Mn, Cr and other elements, all the coated electrodes have molten (welding) slag on the surface after welding, which needs to be removed. Therefore, the interlayer temperature during surfacing welding should not be too high High, in order to facilitate the separation and deslagging of slag and iron, which requires that the metal hardness of the surfacing hammer body should not be very high (generally ≤ HRC50), although its toughness is relatively good, but the wear resistance is not enough, which reduces the service life of the hammer head

To further improve the wear resistance of the hammer body and the service life of the hammer head, the hardness of the surfacing metal must be higher (for example, the hardness value ≥ HRC60), and it should contain more alloy elements and higher carbon content, correspondingly The interlayer temperature during surfacing welding must be higher (when the hardness value ≥ HRC60, the interlayer temperature should be ≥ 600 ° C), so that the surfacing layer does not produce cold cracks or reduce the number of cold cracks in the surfacing layer. It is almost impossible to surfacing welding electrodes with coatings, because the temperature between layers is high, so the temperature of welding slag removal is also high (not lower than the temperature between layers), at this time, it is difficult to separate slag and iron, and it is difficult to clean up welding slag , the welding seam is very easy to form slag inclusions, which leads to stress concentration, reduces the welding quality, and reduces the service life of the hammer head; at the same time, the long time to clean the welding slag makes the welding seam temperature decrease rapidly, which makes it easier to maintain a high interlayer temperature. Brings a lot of difficulty, it is difficult to ensure the quality of welding