Method of restoration of working surfaces of crystallizer walls

FIELD: metallurgy; restoration of working surface of crystallizer walls without disassembly of it.

SUBSTANCE: method of restoration of crystallizer walls made from copper and its alloys includes making notch, 0.5 mm deep at depth of wear of working surface no less than 1.0 mm. Then, working surface at depth of wear no less than 0.5 mm is subjected to shot-blasting after which precoat of thermo-reactive material, 0.1-0.2 mm thick and working layer of wear-resistant material are applied by gas thermal spraying. Depth of residual wear is no less than 0.5 mm.

EFFECT: enhanced resistance of coat.

2 ex

 

The invention relates to the field of metallurgy and can be used when restoring a working surface of the mould walls without disassembly.

Closest to the proposed method is a way to restore the working surface of the mould walls without disassembly, adjacent to the corners of the mold in the lower part of the walls, made of copper and its alloys, including shot blasting work surface with the depth of wear of not less than 0.5 mm and a thermal spraying it working layer of wear-resistant material with a residual depth of wear of not less than 0.5 mm (patent 2186654, Russia, 16.02.01, 22 D 11/057). However, this method has a low resistance due to insufficient strength of its adhesion to the working surface of the mould walls.

The technical result is to increase the resistance of the coating, and hence the mould.

In the method of restoring the working surface of the mould walls without disassembly, adjacent to the corners of the mold in the lower part of the walls, made of copper and its alloys according to the invention are notched to a depth of 0.5 mm working surface with the depth of wear of not less than 1.0 mm, shot blasting work surface with the depth of wear of not less than 0.5 mm, a thermal spraying it p is dsloe of the heat-sensitive material with a thickness of 0.1 to 0.2 mm and a working layer of wear-resistant material with a residual depth of wear of not less than 0.5 mm.

The notch depth up to 0.5 mm working surface with the depth of wear of not less than 1.0 mm and a thermal spraying it sublayer of the heat-sensitive material with a thickness of 0.1 to 0.2 mm further increase the adhesion strength of the coating with the working surface of the mold. This increases the stability of the coating, and hence the mould.

The notch depth of more than 0.5 mm working surface with the depth of wear is less than 1.0 mm leaves the relief on the surface even after spraying coating, which can lead to a breakthrough cast metal. The thickness of the underlayer is less than 0.1 mm does not increase the strength of adhesion of the coating with the working surface due to discontinuities in the coating. The thickness of the sublayer more than 0.2 mm leads to a decrease of the adhesion strength of the coating of the working surface of the mould.

Example 1. Restored working surface of the walls of the fixed mold section 250×1710 mm without disassembly after the withdrawal of the reserve. Wear occurred in the lower part of the working surface adjacent to the corners of the mold, the length up to 350 mm from bottom, width up to 60 mm from the angle and depth, increasing in the direction of travel of the metal to 2.0 mm Narrow walls of the mold were made of 2,CoCr and wide - M1 R.

The notch depth of 0.5 mm was subjected to the working surface, primic the expansion to the corners on the length of 200 mm, width 30 mm, with a depth of wear of not less than 1.0 mm, Shot peened exposed working surface adjacent to the corners, length 300 mm, width 50 mm, depth of wear of not less than 0.5 mm On the treated working surface using a gas burner MT-2 deposited sublayer thickness of 0.15 mm of heat-sensitive material PT-ON and working layer of wear-resistant alloy PNU thickness, providing across the worn surface depth residual wear 0,5 mm

The use of such a mold for continuous casting machine resistance was 55 heats.

Example 2 (the prototype). Restored working surface of the walls of the fixed mold section 250×1710 mm without disassembly after the withdrawal of the reserve. Wear occurred in the lower part of the working surface adjacent to the corners of the mold, the length up to 350 mm from bottom, width up to 60 mm from the angle and depth, increasing in the direction of travel of the metal to 2.0 mm Narrow walls of the mold were made of 2,CoCr and wide - 1.

Blast processing was subjected to a working surface adjacent to the corners, length 300 mm, width 50 mm, depth of wear of not less than 0.5 mm On the treated working surface using a gas burner MT-2 working deposited coating of wear-resistant alloy PNU with depth residual wear 0,5 mm

Inthe operation of this mold in CCM resistance of the coating was 35 heats.

The notch depth up to 0.5 mm working surface with the depth of wear of not less than 1.0 mm, shot blasting work surface with the depth of wear of not less than 0.5 mm, a thermal spraying it sublayer of the heat-sensitive material with a thickness of 0.1 to 0.2 mm and a working layer of wear-resistant material with a residual depth of wear of not less than 0.5 mm allow not only to increase the durability of the coating, but also to obtain savings spraying material.

The way to restore without disassembly of the mold working surface of the lower part of its walls made of copper and its alloys, including shot blasting and thermal spraying, characterized in that the working surface with the depth of wear of not less than 1.0 mm are notched to a depth of 0.5 mm, and shot peened expose the working surface with the depth of wear of not less than 0.5 mm, after which thermal spray coating on the machined work surface put a sublayer of the heat-sensitive material with a thickness of 0.1 to 0.2 mm and a working layer of wear-resistant material with a residual depth of wear of not less than 0.5 mm.



 

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FIELD: metallurgy.

SUBSTANCE: working walls of crystallizer are restored without dismounting them. At first condition of working surfaces of walls is detected. If lower portions of surfaces of narrow and wide walls near angles of crystallizer are worn and central portion of narrow walls are not worn, shot blasting of worn surface is performed. Then coating is applied onto said zone by gasothermic deposition. Residual wear degree is no less than 0.5 - 0.6 mm. If central portion of narrow walls is not worn it is provided improved strength of deposited coating.

EFFECT: enhanced strength of deposited coating.

2 ex

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2 ex

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EFFECT: enhanced resistance of coat.

2 ex

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