Furnace roller and manufacturing method thereof

Abstract

The invention relates to a high-temperature furnace roller for steel mill cold-rolled steel sheet continuous annealing line, continuous hot galvanizing line and silicon steel production line, especially to a JSSTDG-04-01 furnace roller and manufacturing method thereof. The product is composed of furnace roller base made of heat-resisting cast steel and detonation-sprayed metal-ceramic oxide coating on the surface of the furnace roller; the chemical composition of the ceramic in the coating is Al2O3, whose content is 10% to 30%; the content of the high-temperature alloy in the coating is 70% to 90%. The manufacturing steps include: cleaning the roller surface, preheating, sandblasting, spraying, polish-grinding, heat processing, dynamic balancing, testing and packaging. The high-temperature strength, accumulated-burl-resistant property and wear-resistant property of the product are tested to be superior.

Description

technical field [0001] The invention relates to furnace rolls in the middle-high temperature section of cold-rolled steel sheet continuous annealing lines, continuous hot-dip galvanizing lines and silicon steel production lines in steel mills, especially furnace rolls and a manufacturing method thereof. Background technique [0002] At present, the following technologies are commonly used in furnace roll spraying at home and abroad: [0003] Preparation of oxide ceramic coatings, such as Al, by plasma spraying 2 O 3 , Al 2 O 3 -TiO 2 , ZrO 2 -Y 2 O 3 Coating, etc., which are characterized by good high temperature resistance, corrosion resistance and wear resistance of the coating, but the disadvantage is that the coating porosity is high (≥3%); the bonding strength between the coating and the substrate is low (20-50Mpa); The thermal shock resistance of the coating is poor, so it is less practical as a steel mill furnace roll coating. [0004] Supersonic spraying of ...

AI Technical Summary

Problems solved by technology

[0003] Preparation of oxide ceramic coatings such as Al by plasma spraying 2 o 3 、Al 2 o 3 -TiO 2 , ZrO 2 -Y 2 o 3 Coating, etc., which are characterized by high temperature resistance, corrosion resistance, and wear resistance of the coating, and its disadvantages are that the porosity of the coating is high (≥3%); the bonding strength between the coating and the substrate is low (20-50Mpa); The thermal shock resistance of the coating is poor, so it is less practical as a furnace roller coating in steel mills

[0004] Supersonic spraying NiCr-Cr 3 C 2 Or WC / Co powder, although this type of coating has high bonding strength (≥70MPa) and low coating porosity (≤1%), its high temperature resistance is poor, and NiCr-Cr 2 C 3 The maximum temperature limit of the coating is 850°C, while the WC / Co coating is only suitable for use below 540°C