CN-121373899-B - Flux-cored wire for impact wear resistance of welding high manganese steel lining plate and surfacing method

Abstract

A flux-cored wire for the impact abrasion resistance of a welded high manganese steel lining plate and a surfacing method belong to the technical field of surface engineering, and aiming at the problems of brittle fracture, spalling of a surfacing layer, deformation and the like of a traditional high manganese steel lining plate, a flux-cored wire comprises high-carbon chromium iron powder, micro-carbon chromium iron powder, graphite powder, ferrosilicon powder, manganese iron powder, titanium iron powder, molybdenum iron powder, vanadium iron powder, boron iron powder, calcium fluoride powder, nickel powder and the balance of iron powder; the surfacing method comprises the steps of preprocessing, drying, automatically surfacing by adopting plasma arcs, wherein the current is 135-180A, the welding speed is 350-650 mm/min, the wire feeding speed is 1800-220mm/min, the compressed gas and the shielding gas are argon, and the surface temperature of the high-manganese steel lining plate is controlled.

Inventors

• XIAO HE
• LI BINZHOU
• CHAI QINGPING
• JIANG YUANBO
• WANG LEI
• ZHU YONGCHAO
• Si Panpan
• HUANG ZIJIAN
• QI LIWEI
• Mu Yuli

Assignees

• 鞍钢集团矿业有限公司

Dates

Publication Date

20260512

Application Date

20251224

Claims (7)

1. 1. A build-up welding method for welding a high manganese steel lining plate is characterized in that, Step1, preprocessing the surface of a high manganese steel lining plate; Drying and dehumidifying a flux-cored wire, wherein the flux-cored wire comprises a sheath and a flux core, and the flux core comprises, by weight, 10-18wt% of high-carbon ferrochrome powder, 25-38wt% of micro-carbon ferrochrome powder, 0.5-2wt% of graphite powder, 1-2wt% of ferrosilicon powder, 1-4wt% of ferromanganese powder, 1.5-3wt% of ferrotitanium powder, 1-5wt% of ferromolybdenum powder, 1-4wt% of ferrovanadium powder, 0.5-5wt% of ferroboron powder, 0.3-1wt% of calcium fluoride powder, 0.5-2wt% of nickel powder and the balance reduced iron powder; The welding equipment adopts an automatic plasma arc surface welding machine, wherein the welding technological parameters comprise welding current 135-180A, welding speed 350-650 mm/min, wire feeding speed 1800-2200 mm/min, and wire feeding mode is paraxial wire feeding; and 4, in the plasma cladding process, controlling the surface temperature of the high manganese steel lining plate at a position 5cm away from the molten pool within a range of 150-280 ℃.
2. 2. The method for overlaying a high manganese steel lining plate according to claim 1, wherein the sheath is a low-carbon cold-rolled steel strip, and the welding wire is made by wrapping the sheath with a flux core by cold-rolling drawing.
3. 3. The surfacing method for welding the high manganese steel lining plate according to claim 2, wherein the diameter of the flux-cored wire is 2.4-3.2 mm, and the filling rate is 42-50%.
4. 4. The surfacing method for welding a high manganese steel lining plate according to claim 1, wherein in the step 3, argon with the purity of more than or equal to 99.99% is adopted as both the compressed gas and the shielding gas, the flow rate of the compressed gas is 3-7L/min, and the flow rate of the selected shielding gas is 5-12L/min.
5. 5. The method for overlaying a high manganese steel lining plate according to claim 1, wherein in the step 2, the flux-cored wire is placed in a heating furnace at 150-250 ℃ for 1-2 hours, and drying and dehumidification are carried out.
6. 6. The method for overlaying a welded high manganese steel lining plate according to claim 1, wherein the overlaying layer structure of the high manganese steel lining plate after plasma overlaying is composed of an iron-based solid solution and multicomponent reinforcing phases uniformly distributed therein.
7. 7. The surfacing method for welding the high manganese steel lining plate according to claim 1, wherein the hardness of a surfacing layer of the high manganese steel lining plate after plasma surfacing is 55-62 HRC, and the wear resistance of impact abrasion resistance is 1.44-1.88 times of that of the high manganese steel lining plate.

Description

Flux-cored wire for impact wear resistance of welding high manganese steel lining plate and surfacing method Technical Field The invention belongs to the technical field of surface engineering, and particularly relates to a flux-cored wire for impact wear resistance of a welded high manganese steel lining plate and a surfacing method. Background The traditional high manganese steel lining plate, such as Mn13, has the thickness of 50-130 mm, has excellent toughness, impact toughness not less than 150J/cm < 2 >, and strong work hardening capacity, and the hardness after work hardening can reach HB500, but the impact abrasion of the abrasive to the lining plate is extremely rapid and serious due to insufficient hardness in the initial stage of putting the ball mill into use, the external dimension of the lining plate is reduced too early, the steel lifting amount cannot meet the requirement, further the ball milling efficiency is reduced, and the running stage of the ball mill is obviously not standard, so the lining plate of the ball mill needs to be replaced frequently. When the existing open arc automatic surfacing technology and submerged arc surfacing technology are used for surfacing high manganese steel, carbide precipitation in a heat affected zone of the high manganese steel is often caused, impact toughness is reduced to be less than 50J/cm < 2 >, the risk of brittle fracture is extremely high, and a surfacing layer can also form large-scale cracking and peeling due to excessive welding stress. Moreover, due to the large heat input, typically greater than 1.5kJ/mm, the deformation of the matrix is very severe and difficult to control. In addition, the existing surfacing materials are multi-focused on single wear resistance or impact resistance, and the cooperative requirement of the ball mill lining plate on a high-strength and toughness matrix and a hardening wear-resistant layer is difficult to meet. The plasma surfacing technology has the advantages of strong penetration controllability, high cladding speed, higher production efficiency, metallurgical bonding state of the interface between the substrate material and the surfacing layer after surfacing, high bonding strength, easy realization of mechanization and automation in the surfacing process, and the like. However, the research on the plasma surfacing technology is less aiming at the lining plate of the mine ball mill at present, and the wear-resistant coating is basically prepared by adopting the traditional Fe-Cr-C alloy system material, so that the problem of interfacial cracking between the high manganese steel matrix and the surfacing layer is ignored. Patent CN119057304a discloses a high-stress impact abrasion resistant plasma surfacing flux-cored wire and a preparation method thereof, and although the prepared surfacing alloy has higher impact abrasion resistant effect, the influence of the surfacing technology on the deformation of a high-manganese steel lining plate and the cracking of a coating/matrix interface is not concerned. In addition, although the plasma surfacing process adopts full argon protection without self-protection, in actual production, the deoxidization product is often prevented from floating out of a molten pool due to larger protection gas pressure, so that pores are increased, and therefore, a weak self-protection effect can be exerted by using a small amount of calcium fluoride to offset the influence of partial external gas pressure. Disclosure of Invention The invention aims to provide a flux-cored wire for the impact abrasion resistance of a high manganese steel lining plate for welding the high manganese steel lining plate on the inner wall of a ball mill cylinder body and a surfacing method, so that the low dilution rate, no flaking and micro-deformation surfacing of the impact abrasion resistance coating of the high manganese steel lining plate are realized, and the problems that the embrittlement of a high manganese steel heat affected zone and the deoxidization product of a surfacing layer are difficult to float out of a molten pool in the prior art are overcome through a welding wire formula. In order to achieve the above purpose, the present invention is realized by the following technical scheme: The flux-cored wire for the impact wear resistance of the welding high manganese steel lining plate comprises a sheath and a flux core, wherein the flux core is composed of, by weight, 10-18wt% of high-carbon ferrochrome powder, 25-38wt% of micro-carbon ferrochrome powder, 0.5-2wt% of graphite powder, 1-2wt% of ferrosilicon powder, 1-4wt% of ferromanganese powder, 1.5-3wt% of ferrotitanium powder, 1-5wt% of ferromolybdenum powder, 1-4wt% of ferrovanadium powder, 0.5-5wt% of ferroboron powder, 0.3-1wt% of calcium fluoride powder, 0.5-2wt% of nickel powder and the balance of reduced iron powder. Further, the sheath is a low-carbon cold-rolled steel strip, and the welding wire is manufactured by wrapping the