A 550-grade wear-resistant composite plate and its production method

Abstract

The invention discloses a 550-grade wear-resistant composite board and a production method thereof. The composite board is composed of a base material and a composite material, the base material is the low-carbon low-alloy steel, and the composite material is the 550-grade wear-resistant steel. A composite blank is vacuumized and then is subjected to vacuum electron beam seal welding, the weldingprocess is double-gun linkage, each weld joint is divided into N sections during welding, N is larger than or equal to 5, and the length of each section ranges from 200 mm to 400 mm. When the composite blank is heated, a central heating mode is adopted, so that the composite blank is directly heated from the center and is heated in a peripheral conduction manner. The temperatures of the flame openings on the upper surfaces of the head and the tail of the composite blank are increased by 40-50 DEG C 1-2 hours before the composite blank is discharged out of the furnace, the thickness of the finished composite board ranges from 20 mm to 100 mm, the shear strength of the composite surface of the composite board is greater than or equal to 502MPa, the bonding rate is 100%, the Brinell hardnessof the composite layer is greater than or equal to 535, and the room-temperature impact energy is greater than or equal to 118J. The 550-grade wear-resistant composite board and the production methodthereof are applied to the easily-worn equipment.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a 550-grade wear-resistant composite board produced by applying vacuum composite + rolling technology and a preparation method of the composite board. Background technique [0002] Composite wear-resistant steel plate is a kind of wear-resistant composite material produced by advanced composite manufacturing technology, and it is an advanced wear-resistant composite material in the industrial field. Since the substrate of the wear-resistant composite steel plate is made of ordinary carbon low-alloy steel with good plasticity and toughness, it can absorb energy during the impact process. Therefore, the wear-resistant composite steel plate has stronger impact resistance and crack resistance than simple wear-resistant steel. performance, it can be applied under working conditions with strong vibration and impact. At the same time, the wear-resistant co...

AI Technical Summary

Problems solved by technology

However, in the preparation process of high-grade wear-resistant composite plates, due to the difference in physical and chemical properties between wear-resistant steel and base steel, joint failure and plate shape control problems often occur

First of all, due to the high carbon content of wear-resistant steel, welding cracks are prone to occur when the billets are sealed and welded, especially when large-scale composite billets are sealed and welded, the welding deformation and welding stress concentration are obvious, and joint cracking and failure are more likely to occur

Secondly, during the heating process of the composite blank, due to the inconsistent heating deformation of the composite blank, the stress directly acts on the position of the welded joint, and the problem of cracking and failure of the welded joint is also prone to occur.

In the process of preparing high wear-resistant composite panels by conventional rolling method, it often occurs that the composite billet cracks and fails after sealing and welding or during heating.

In addition, in the process of rolling the composite billet, the deformation of the wear-resistant steel and the base steel are often inconsistent, and the problem of warping occurs, and even the rolling cannot be continued due to excessive warping.

Based on the above problems, the success rate of producing high-grade wear-resistant steel clad plates by the conventional rolling composite process is only about 50%.

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