CS257819B1 - Tubular steel wire filling for extra wear-resistant layers - Google Patents

Abstract

Filler of tubular steel wire for welding especially functional surfaces of steel components, resistant to wear at higher temperatures. The composition of the filler ensures its good flowability in the production of tubular wire, as well as the chemical composition of the weld metal. The filler consists of 0.7 to 2.8 wt. % ferromanganese or manganese, 0.35 to 3.75 wt. % ferrosilicon or silicon, 4.2 to 52.5 wt. % ferrochrome or chromium, 6.85 to 26.0 wt. % ferromolybdenum or molybdenum, 6.45 to 19.05 wt. % pheoniobium or niobium, 1.85 to 7.5 wt. % ferrotungsten or tungsten, 1.0 to 2.75 wt. % ferrovanadium or vanadium, 5.25 to 16.25 wt. % graphite, 0.15 to 0.75 wt. % sodium fluorosilicate, 0.2 to 1.0 wt. % silicon carbide and the rest iron. The weld metal has a hardness of HRC 62 in the first layer and 62.8 to 65.5 in the second layer. The tubular wire is suitable for the renovation of steel parts exposed to wear at temperatures above 600 C.

Description

257819

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a tubular steel wire intended for the renovation or production of functional surfaces of steel components by welding particularly abrasion resistant layers. The tubular wires currently used contain fillers consisting of powdered composite materials or metals and other components ensuring optimum welding-technological properties of the tube wire during welding. These other ingredients in the welding process form a slag that is removed before the next sweep is welded and thus the economy is used. The use of a shielding gas, for example CO 2, also increases the cost of welding. The filling of such tube wires in one case contains 5.5 to 7.5% by weight. % of ferromolybdenum, 1.2 to 2.5 wt. % ferrovanadium, 5.5 to 6.5 wt. % of ferochrome, 1.5 to 1.7 wt. % ferromagnetic, 2.0 to 2.4 wt. of ferotitanium, 0.4 to 0.6 wt. % ferromanganese, 3.0 to 4.5 wt. fluorokremičitanusodného. In another case, 40 to 60 wt. ferrovanadium, 20 to 40 wt. ferochrome, 2 to 12 wt. % tungsten, 2 to 8 wt. % of graphite, 2 to 16 wt. % of ferro molybdenum, 1 to 4 wt. % ferritate, 1 to 4 wt. % ferromanganese, 1 to 6 wt. sodium fluoride. Another charge contains 0.5 to 2.5% by weight. sodium fluorosilicate, 41 to 69 wt. % of ferro-chromium or high-carbon ferochrome, 5 to 15 wt. ferrovanadium or vanadium, 8 or 17 wt. % of ferroboron, 0.2 to 9 wt. % of ferrotitanium, 0.1 to 4.2 wt. % of graphite and 5 to 30 wt. irons. Such cartridges fill the trough of a steel strip of a future tubular wire, with the weight ratio of the tubular wire weight being controlled by the chemical composition needs of the welded layer. Tubular wires with such cartridges are used in practice for refurbishment, as well as for the production of functional surfaces by welding, which are intended to provide abrasion resistance, impact resistance even at higher temperatures. If a particularly high resistance to abrasion and erosion is required at temperatures above 600 ° C, these are not satisfactory since the tempering temperatures of such coatings lie within the range of 500 ° C to 550 ° C and are shrinking.

These disadvantages are largely eliminated by the composition of the filling of the tubular wire of the invention, the principle being that the filling consists of 0.7 to 2.8% by weight. % ferromanganese or manganese, 0.35 to 3.75 wt. ferro-silicon or silicon, 4.2 to 52.5% by weight, ferro-chromium or chromium, 6.85 to 26.0% by weight; % of ferro molybdenum or molybdenum, 6.45 to 19.05 wt. feroniobium alboniobu, 1.85 to 7.5 wt. % of ferromagnetic or tungsten, 1.0 to 2.75 wt. ferrovanadium orbovanad, 5.25 to 16.25% wt. % of graphite, 0.15 to 0.75 wt. sodium fluorosilicate, 0.2 to 1.0 wt. silicon carbide and iron residue. The filling of the tubular wire of the invention exhibits good flowability. This also improves the uniformity of the filling of the tube wire, the improvement of the welding-technological properties of the over-coating, thereby increasing the uniformity of the chemical composition of the welded layer. All of the tubular wire fillers used have a granulometric composition in the range of 63 to 315 µm with a permissible deviation of up to 20% below 63 µm, in addition to the niobium-based alloy, which is to be below 90 µm of the formation limit, the higher the number of nucleation centers for fine structure formation matrix.

Since the fill contains a particularly low mineral content, the scrape on the surface of the non-greasy slag and thus the weld can be continuously continued, thereby increasing the economy of the coating. CO 2 gas. The filler tube wire already provides the required final properties in the first layer and at the same time it has a particularly high abrasion and erosion resistance even at temperatures above 600 ° C. The weld metal in the second layer had hardness values in HRC of 62.8 to 65.5, whereas the durability of the welded layer with respect to the hardness reached is particularly high even under the most severe abrasion wear conditions.

According to the invention, in one case, a fill was produced which contained 16.25% by weight of graphite, 2.8% by weight. % manganese, 0.35 wt. ferro-silicon, 52.5 8 wt. % of ferochrome, 6.85 8 wt. % niobium, 7.5% ferro-phr, 2.75% by weight; % ferrovanadium, 0.75% sodium fluorosilicate, 1.0% wt. silicon carbide, 3.8 wt. irons.

Claims (1)

In another case, a filler according to the invention was produced which contained 5.25% by weight of graphite, 0.7% by weight. % manganese, 3.75 wt. Ferro-silicon, 4.2 wt. % chromium, 26.0 wt. ferro-molybdenum, 19.05 wt. % feronium, 1.85 wt. tungsten, 1.0 wt. % ferrovanadium, 0.15 wt. sodium fluorosilicate, 0.2 wt. % silicon carbide and 37.85 wt. irons. In the case of the present invention, a filler according to the invention was produced and contained 16.25 wt. % graphite, 0.7 wt. % manganese, 0.35 wt. % silicon, 4.2 wt. % chromium, 26.0 wt. % of ferro molybdenum, 19.05 wt. % of ferronium, 7.5 wt. tungsten, 2.75 wt. % ferrovanadium, 0.15% by weight of sodium fluorosilicate, 0.2% by wt. % silicon carbide, 22.85 wt. irons. All of the above-described fillings of the present invention have been found to be useful in filling tubular wire rods. The tubular wire sleeves have a particularly high abrasion and erosion resistance of 650 ° C, even in the case of single-layer welds. Welding could be done uninterrupted as no wreckage was formed on the worms during the surfacing. The filler according to the invention can be advantageously applied to the tubular wire for renovation or to the manufacturing and mechanized welding of the functional surfaces of the steel components, with the requirement of extra-hardened welded layers, especially in heavy industry and in those cases where particularly high abrasion resistance is required even at temperatures above 600 ° C. SUBJECT MATERIAL The tubular steel wire filler for the welding of particularly wear resistant layers of wear resistant wear resistant steel parts, characterized in that it consists of 0.7 to 2.8% by weight. % of ferromanganese or manganese, 0.35 to 3.75 wt. ferro-silicon or silicon, 4.2 to 52.5 wt. of ferochrome or chromium, 6.85 to 26.0 4 wt. % ferromolybdenum or molybdenum, 6.45 to 19.05 4 wt. feronium or niobium, 1.85 to 7.5 wt. % ferro-tungsten or tungsten, 1.0 to 2.75 wt. ferrovanadium or vanadium, 5.25 to 16.25 4 wt. % of graphite, 0.15 to 0.75 4 wt. sodium fluorosilicate, 0.2 to 1.0 wt. silicon carbide and iron residue.