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A high-strength and high-wear-resistant stainless steel surfacing flux-cored wire and its application

A stainless steel, high wear-resistant technology, used in welding equipment, welding media, welding/cutting media/materials, etc., can solve the problems of density and expansion coefficient obstacles, high manufacturing and repair costs, poor toughness of surfacing alloys, etc. Eliminate crystal cracks, high welding stability, and good weld formation

Active Publication Date: 2020-09-18
北京赛亿科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the solid wire H25Cr3Mo2Mn V used by domestic iron and steel enterprises to repair rolls still has the problem of insufficient wear resistance, while the flux cored wire alloy systems developed at home and abroad mostly use Cr-Mo, Cr-Mo-V, Cr-Mo-W-V , Cr-Ni-Mo-V, Cr-Mo-W-V-Nb mainly
High-chromium cast iron with good wear resistance and corrosion resistance, if supplied in the form of flux-cored welding wire, due to the large heat input of the weld seam during submerged arc surfacing welding, the formed carbides are too thick, and the surfacing alloy has poor toughness , even if the stress reduction methods such as preheating and post-weld heat treatment are adopted, cracking is still easy during submerged arc surfacing, which makes the production efficiency of the enterprise low and the energy consumption is large
Most small enterprises use their welding rods for manual surfacing operation, which has low production efficiency and high manufacturing and repair costs
The wear resistance of surfacing alloys is mainly related to the hard phase in its microstructure, such as the shape and quantity of carbides, but there are insurmountable barriers of density and expansion coefficient in the combination of carbide alloys and steel, which makes it possible to Poor weldability, low bonding strength between base metal and cladding layer, easy to produce various defects such as cracks and peeling, and high material cost, which largely limits the wide application of this kind of wear-resistant welding wire for surfacing welding

Method used

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  • A high-strength and high-wear-resistant stainless steel surfacing flux-cored wire and its application
  • A high-strength and high-wear-resistant stainless steel surfacing flux-cored wire and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A high-strength and high-wear-resistant stainless steel surfacing flux-cored welding wire, including a 430 ferritic stainless steel sheath with a chromium content of 16.0% and a flux core with a filling content of 38%. The composition and mass percentage of the flux core are: metal Chromium powder: 28%; nickel powder: 4%; niobium powder: 1%; vanadium powder: 2%; manganese powder: 10%; 3 rare earth compounds composed of 6%; quartz: 5%; magnesia: 3%; fluoride composed of sodium fluoride, sodium fluoroaluminate and calcium fluoride in a mass ratio of 1:1:1: 4%; additives: 5 %; 5% rutile; the balance is iron powder.

[0025] The multi-element alloy is composed of the following components in mass percentage: the content of magnesium is 45%, the content of aluminum is 40%, and the content of boron is 15%; the additive is composed of the following components in mass percentage: the content of graphene 30%, 20% silicon nitride, 25% each of tungsten carbide and chromium carbide...

Embodiment 2

[0031] A high-strength and high-wear-resistant stainless steel surfacing flux-cored welding wire, including a 430 ferritic stainless steel sheath with a chromium content of 17.0% and a flux core with a filling content of 35%. The composition and mass percentage of the flux core are: metal Chromium powder: 25%; nickel powder: 5%; niobium powder: 2%; vanadium powder: 3%; manganese powder: 10%; 3 rare earth compounds composed of 4%; quartz: 4%; magnesia: 5%; fluoride composed of sodium fluoride, sodium fluoroaluminate and calcium fluoride in a mass ratio of 2:1:1: 3%; additives: 6 %; rutile 6%; the balance is iron powder.

[0032] The multi-element alloy is composed of the following components in mass percentage: the content of magnesium is 50%, the content of aluminum is 40%, and the content of boron is 10%; the additive is composed of the following components in mass percentage: the content of graphene 30%, 20% silicon nitride, 25% each of tungsten carbide and chromium carbide...

Embodiment 3

[0038]A high-strength and high-wear-resistant stainless steel surfacing flux-cored welding wire, including a 430 ferritic stainless steel sheath with a chromium content of 18.0% and a flux core with a filling content of 40%. The composition and mass percentage of the flux core are: metal Chromium powder: 30%; nickel powder: 5%; niobium powder: 1%; vanadium powder: 1%; manganese powder: 9%; 2 rare earth compounds composed of 2%; quartz: 8%; magnesia: 5%; fluoride composed of sodium fluoride, sodium fluoroaluminate and calcium fluoride in a mass ratio of 1.5:1:1: 5%; additives: 7 %; rutile 8%; the balance is iron powder.

[0039] The multi-element alloy is composed of the following components in mass percentage: the content of magnesium is 50%, the content of aluminum is 35%, and the content of boron is 15%; the additive is composed of the following components in mass percentage: the content of graphene 30%, 20% silicon nitride, 25% each of tungsten carbide and chromium carbide...

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Abstract

The invention belongs to the field of welding materials, relates to a stainless steel welding wire material, and particularly relates to a high-strength and high-abrasion-resistance stainless steel surfacing flux-cored wire and application thereof. The high-strength and high-abrasion-resistance stainless steel surfacing flux-cored wire comprises a skin and a flux core, and the flux core comprisesthe compositions of, by mass, 25-30% of metal chromium powder, 3-5% of nickel powder, 1-2% of niobium powder, 1-3% of vanadium powder, 8-10% of manganese powder, 5-8% of multi-alloys, 2-6% of rare earth compounds, 5-8% of quartz, 3-5% of magnesia, 3-5% of fluorides, 5-7% of additives, 5-8% of rutile and the balance iron powder. An appropriate amount of particle size controllable hard phases and avariety of synergistic alloy powder are added into the high-strength and high-abrasion-resistance stainless steel surfacing flux-cored wire to change the matrix structure of an existing ferritic stainless steel surfacing alloy, so that the stainless steel surfacing alloy has the advantages of high strength and good abrasion resistance; and meanwhile, preheating and post-weld treatment are not required during surfacing, and no crack is generated. The high-strength and high-abrasion-resistance stainless steel surfacing flux-cored wire is especially suitable for the application of surfacing repair of cutter blades of shield tunneling machines or spiral reamers of brick making machines.

Description

technical field [0001] The invention belongs to the field of welding materials and relates to a stainless steel welding wire material, in particular to a high-strength and high-wear-resistant stainless steel surfacing flux-cored welding wire and its application. Background technique [0002] In welding production operations, it is often required to carry out surfacing welding manufacturing or repair on the surface of parts with poor surface wear resistance, surface wear or local area damage. Using slag, gas or slag gas combined protection, a layer of high-strength wear-resistant, heat-resistant or corrosion-resistant metal layer is surfacing on the surface of mechanical parts to endow the surface with special properties. This process has been adopted by many enterprises. The welding materials used include coated electrodes, solid welding wires and flux-cored welding wires. Among them, the surfacing welding of coated electrodes has the advantages of simple operation, flexibil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/12
CPCB23K35/0266B23K35/308
Inventor 庄浩琴
Owner 北京赛亿科技有限公司
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