Surfacing flux-cored wire and method for enhancing tenacity of surfacing deposited metal

Abstract

The invention provides a surfacing flux-cored wire which is characterized by being prepared from a steel strip and the following flux core raw materials: in each 1000 g of flux core raw materials, 90 g of chromium carbide, 20 g of vanadium carbide, 20 g of niobium carbide, 30 g of ferrovanadium, 54 g of ferrocolumbium, 100 g of chromium powder, 120 g of nickel, 16 g of molybdenum, 21 g of 75 ferrosilicon, 50 g of manganese, and 479 g of iron powder. The invention also provides a method for enhancing the tenacity of a surfacing deposited metal through surfacing by virtue of the surfacing flux-cored wire. The method is capable of changing the different addition forms and amounts of carbides of alloys to the surfacing flux-cored wire without changing the content of the alloys of the surfacing deposited metal, thus changing the micro-morphology of martensite and improving the tenacity of the surfacing deposited metal.

Description

technical field [0001] The invention relates to a flux-cored welding wire, in particular to a flux-cored welding wire used in surfacing welding composite manufacturing technology. Background technique [0002] Rolls are one of the main consumable spare parts in steel rolling production. With the development of rolled materials, the continuous improvement of rolling mill speed and automation, the rolling technology has a great impact on the quality of rolls, especially the strength, toughness, wear resistance and roughness resistance of rolls. Higher requirements have also been put forward. The obvious trend in the development of roll materials is to widely use alloying elements and gradually increase the degree of alloying, the hardness of the roll or the thickness of the hardened layer. [0003] Overlay welding composite remanufacturing is an important branch in the field of welding technology, and it is a surface technology treatment method. Since the 1970s, with the exte...

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Problems solved by technology

Although these methods can improve the strength and toughness, they are mainly through the addition of precious high-melting point metals or heat treatment methods, and change the alloy composition in the surfacing deposited metal, which sometimes leads to some negative factors, such as retained austenite toughening The theory once prevailed, but it will lead to the decline of thermal fatigue and wear resistance, so it has its limitations

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