Precipitation hardening stainless steel flux-cored wire for continuous roller submerged arc overlaying and preparation method thereof

Abstract

The invention discloses a precipitation hardening stainless steel flux-cored wire for continuous roller submerged arc overlaying and a preparation method thereof. The flux-cored wire consists of chemical powder and an external carbon steel strip; the chemical powder is 35.0-38.0% of the total weight of the wire; and the chemical powder comprises the following components in percentage by weight: 29.0-31.0% of metal chromium powder, 25.0-26.5% of low-carbon ferrochromium, 12.0-13.0% of metal nickel powder, 10.0-11.5% of metal copper powder, 0.8-1.2% of electrolytic metal manganese, 1.0-1.5% of ferroniobium, 0.1-0.8% of metal molybdenum powder, 0.3-0.6% of ferrotitanium, 2.0-2.5% of rare earth ferrosilicon, 0.3-0.6% of metal aluminum powder, 8.0-10.0% of barium fluoride, and the balance ironpowder. In the flux-cored wire, an overlaying layer achieves excellent wear resistance, corrosion resistance, cold and hot fatigue resistance and tempering softening resistance, so that the service life of continuous rollers can be prominently prolonged.

Description

technical field [0001] The invention relates to a precipitation-hardening stainless steel flux-cored wire for surfacing welding of continuous casting rolls and a preparation method thereof, belonging to the welding field of material processing engineering. Background technique [0002] The working conditions of continuous casting rolls are very harsh, and they need to bear the cyclic load caused by conveying high-temperature billets and the alternating thermal cycle caused by spray cooling. Continuous casting rolls are required to have good wear resistance, corrosion resistance and cold and heat fatigue resistance. . With the development of continuous casting technology and the upgrading of continuous casting steel, the temperature of continuous casting slabs rises, and the requirements for the temper softening resistance of continuous casting rolls are also put forward. High-temperature continuous casting slabs are transported on continuous casting rolls, equivalent to Per...

AI Technical Summary

Problems solved by technology

With the development of continuous casting technology and the upgrading of continuous casting steel, the temperature of continuous casting slabs rises, and the requirements for the temper softening resistance of continuous casting rolls are also put forward. High-temperature continuous casting slabs are transported on continuous casting rolls, equivalent to Perform high-temperature tempering on the roll surface. If the high-temperature tempering resistance of the roll surface is insufficient, its hardness will drop significantly. After continuous transportation of high-temperature steel plates, the roll surface will continue to be tempered at high temperature, and the hardness will continue to decrease, which will eventually lead to continuous casting. Roller failure due to insufficient wear resistance

The traditional continuous casting roll manufacturing method is to surfacing Cr13 martensitic stainless steel on the surface of the billet, such as 0Cr13Ni4MoN, 1Cr13NiMo, etc., but the service conditions of continuous casting rolls are becoming increasingly harsh, and Cr13 martensitic stainless steel is difficult to meet the use requirements. Wear, corrosion, fatigue cracks, etc. often appear on the surface during service, resulting in failure and scrapping of continuous casting rolls

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