High-strength and high-toughness wear-resistant composite steel plate and manufacturing method thereof

Abstract

The invention discloses a high-strength and high-toughness wear-resistant composite steel plate. The composite steel plate comprises a substrate layer and a composite layer compounded to one side or two sides of the substrate layer; and the substrate layer is a carbon steel layer, the composite layer is an ultrahigh-manganese steel layer, and the content of Mn element in the composite layer is 16.00-25.00 wt.%. The invention also discloses a manufacturing method of the high-strength and high-toughness wear-resistant composite steel plate. The manufacturing method comprises the following steps:(1) producing a substrate layer slab and a composite layer slab; (2) assembling the slabs; (3) heating: raising the temperature to 1150-1250 DEG C, and keeping the temperature for 1-3 h; (4) carryingout composite rolling: rolling at an initial rolling temperature of 1120-1220 DEG C and a finishing rolling temperature of 1050-1200 DEG C, and controlling the reduction ratio to be 50% or above; and5) cooling after rolling. The high-strength and high-toughness wear-resistant composite steel plate of the invention has the advantages of high strength and hardness, good toughness, high wear resistance and excellent comprehensive performances.

Description

technical field [0001] The invention relates to a steel plate and a manufacturing method thereof, in particular to a high-strength, high-toughness wear-resistant composite steel plate and a manufacturing method thereof. Background technique [0002] Ultra-high manganese steel is widely used in wear-resistant parts in many industries, especially for soft abrasives and large-angle erosion wear conditions, such as impact plates of fan coal mills, etc. Ultra-high manganese steel is developed by increasing the content of carbon and manganese on the basis of the standard composition of ordinary high manganese steel. It not only has a high work hardening rate, but also maintains a high toughness austenite structure, and has good wear resistance under medium and low impact conditions. It has been proved by experiments and actual production that the service life of the impact plate made of this material is nearly double that of ordinary high manganese steel. At home and abroad, ult...

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Problems solved by technology

[0003] However, there are still some problems with ultra-high manganese steel. For example, due to its low strength and hardness, it cannot be applied to key structural parts that need to bear weight.

In addition, there are some problems in the use of ultra-high manganese steel. For example, ultra-high manganese steel has strong rheology. When it is used as a liner for a large mill, the liner will be arched due to impact and expansion, and the breaking bolt will fall off; Another example is when the ultra-high manganese steel is used in the compartment plate and the grate plate, the material rheology will cause the grate seam to be stuck and the output of the mill will be seriously reduced. Therefore, the high-quality wear-resistant material of ultra-high manganese steel has some flaws

[0004] Ultra-high manganese steel is mostly produced by casting. Generally, the internal quality of the ingot is poor, there are many defects, and it is prone to cracks during use, which greatly reduces the service life of the product and increases the cost of use, which is not conducive to product marketing.

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