KR20220089274A - Wear-resistant high manganese steel pipe - Google Patents

Abstract

The present specification relates to an abrasion-resistant high-manganese steel pipe, and discloses a wear-resistant high-manganese steel pipe used in various energy industrial environments.
According to an embodiment of the disclosed wear-resistant high manganese steel pipe, C: 0.5 to 1.5%, Mn: 8 to 24%, by weight, the balance contains Fe and other unavoidable impurities, and the internal hardness of the steel pipe may be 350 Hv or more .

Description

Wear-resisting high manganese steel pipe {WEAR-RESISTANT HIGH MANGANESE STEEL PIPE}

The present invention relates to an abrasion-resistant high-manganese steel pipe, and to a wear-resistant high-manganese steel pipe used in various energy industrial environments.

Wear-resistant steel pipes used in various energy industrial environments, such as transport and storage of oil sands and minerals in the mines and oil sands industries, have difficulties in manufacturing when the material is light. In order to solve this problem, abrasion resistance has been secured through either build-up welding using a build-up welding material with high abrasion resistance after manufacturing a steel pipe, or coating with polyurethane.

A steel material with excellent work hardenability has excellent roughness, but has a disadvantage in that the abrasion resistance of the steel pipe is poor at the initial stage of use, before wear resistance through work hardenability is expressed. In this case, if the needle-like material is transferred at the beginning of use, the inside of the steel pipe is torn due to low wear resistance, thereby reducing the life of the steel pipe.

Korean Patent Publication No. 2001-0061815 (published date: July 07, 2001)

In order to solve the above problems, the present invention is to provide an abrasion-resistant high manganese steel pipe.

As a means for achieving the above object, the wear-resistant high manganese steel pipe according to an example of the present invention contains, by weight, C: 0.5 to 1.5%, Mn: 8 to 24%, the balance Fe and other unavoidable impurities, The internal hardness of the steel pipe may be 350Hv or more.

In addition, the wear-resistant high manganese steel pipe according to an embodiment of the present invention may further include 0.1 to 10% by weight of Cr, Mo, V, Ni, and Cu in total.

The present invention can improve the hardness of the inside of the steel pipe by shot-blasting the inside of the steel pipe, thereby securing wear resistance and improving the life of the steel pipe.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes preferred embodiments of the present invention. However, the embodiment of the present invention may be modified in various other forms, and the technical idea of the present invention is not limited to the embodiment described below. In addition, the embodiments of the present invention are provided in order to more completely explain the present invention to those of ordinary skill in the art.

The terms used in this application are only used to describe specific examples. Therefore, for example, a singular expression includes a plural expression unless the context clearly requires it to be singular. In addition, terms such as "comprises" or "including" as used in the present application are used to clearly indicate that the features, steps, functions, components, or combinations thereof described in the specification exist, and other features It should be noted that the use is not intended to preliminarily exclude the existence of elements, steps, functions, components, or combinations thereof.

Meanwhile, unless otherwise defined, all terms used herein should be regarded as having the same meaning as commonly understood by those of ordinary skill in the art to which the present invention pertains. Accordingly, unless explicitly defined herein, specific terms should not be construed in an unduly idealistic or formal sense. For example, a singular expression herein includes a plural expression unless the context clearly dictates otherwise.

In addition, in this specification, "about", "substantially", etc. are used in or close to the numerical value when manufacturing and material tolerances inherent in the stated meaning are presented, and are used in a precise sense to aid the understanding of the present invention. or absolute figures are used to prevent unreasonable use of the mentioned disclosure by an unconscionable infringer.

The wear-resistant high manganese steel pipe according to an embodiment of the present invention may include, by weight, C: 0.5 to 1.5%, Mn: 8 to 24%, the balance Fe and other unavoidable impurities. Hereinafter, the reason for limiting the composition of the wear-resistant high manganese steel pipe will be described in detail.

The content of C is 0.5 to 1.5% by weight.

C is an element that stabilizes austenite to obtain an austenite structure at room temperature, and increases the strength of steel. In particular, C is dissolved in austenite to increase work hardening, to precipitate at grain boundaries to secure high wear resistance, or to secure non-magnetic properties as an austenite phase stabilizing element.

In the present invention, in consideration of the above-described effect, C is added in an amount of 0.5% by weight or more. However, if the C content is excessive, there is a concern that an excessive amount of carbide in the steel is precipitated to reduce productivity, so the upper limit of the C content in the present invention may be limited to 1.5% by weight.

The content of Mn is 8 to 24% by weight.

Mn is an element that stabilizes austenite, and in the present invention, Mn may be added in an amount of 8 wt% or more. However, if the Mn content is excessive, there are problems such as deterioration of corrosion resistance, difficulties in the manufacturing process, increase in manufacturing cost, decrease in tensile strength, decrease in work hardening, etc., so the upper limit of the Mn content in the present invention may be limited to 24% by weight. have.

In addition, the wear-resistant high-manganese steel pipe according to an embodiment of the present invention may optionally further include other alloying elements in addition to the above-described alloy composition.

The wear-resistant high manganese steel pipe according to an example may further include 0.1 to 10% by weight of Cr, Mo, V, Ni, and Cu in total. The reasons for limiting the content of each alloying element are as follows. Since the alloying elements are elements serving to improve corrosion resistance, strength and wear resistance, they may be added in an amount of 0.1 wt% or more in total for the above-described effect. However, if the total content is excessive, the above-described effects are saturated and economical efficiency is lowered, so the upper limit thereof may be limited to 10% by weight in the present invention.

The remaining component of the present invention is iron (Fe). However, since unintended impurities from raw materials or the surrounding environment may inevitably be mixed in the normal manufacturing process, this cannot be excluded. Since these impurities are known to any person skilled in the art of a conventional manufacturing process, all details thereof are not specifically mentioned in the present specification.

Hereinafter, a method for manufacturing an abrasion-resistant high manganese steel pipe according to the present invention will be described in detail. The wear-resistant high manganese steel pipe according to an example of the present invention is a steel material having a corresponding alloy composition and may be manufactured as a welded steel pipe, a seamless steel pipe, etc. through a conventional method. After that, the hardness can be increased by shot blasting the inside of the steel pipe using a spherical shot ball. The internal hardness of the wear-resistant high manganese steel pipe according to an example may be 350 Hv or more, and preferably 500 Hv or more.

Hereinafter, the present invention will be described in more detail through examples. However, it is necessary to note that the following examples are only intended to illustrate the present invention in more detail and are not intended to limit the scope of the present invention. This is because the scope of the present invention is determined by the matters described in the claims and matters reasonably inferred therefrom.

{Example}

The steel having the alloy composition shown in Table 1 below was manufactured into a steel pipe through a conventional method, and then shot blasting was performed inside the manufactured steel pipe using a spherical shot ball. Thereafter, the hardness inside the steel pipe was measured. In Table 1, 'Hv' means the measured hardness value inside the steel pipe.

Alloy composition (wt%) Hv C Mn Cr Cu Ni Mo V Example 1 1.1 18 2.5 0.5 - - - 743.7 Example 2 1.1 12 2.5 0.5 5 One 0.5 791.4 Example 3 0.6 12 3.5 - 2 0.5 One 540.2 Example 4 1.4 18 2.5 - 2 One One 913.2 Example 5 1.5 12 2 - 5 0.5 0.5 898.6 Example 6 1.1 24 2.5 0.5 3 0.5 0.5 715.7

Referring to Table 1, it can be seen that the hardness value inside the steel pipe of Examples 1 to 6 satisfying the alloy composition and manufacturing method defined by the present invention satisfies 350 Hv or more.

In the foregoing, exemplary embodiments of the present invention have been described, but the present invention is not limited thereto, and those of ordinary skill in the art may not depart from the concept and scope of the claims described below. It will be appreciated that various modifications and variations are possible.

Claims (2)

by weight, C: 0.5 to 1.5%, Mn: 8 to 24%, the balance Fe and other unavoidable impurities;
Abrasion-resistant high-manganese steel pipe with an internal hardness of 350Hv or higher. The method of claim 1,
Abrasion-resistant high manganese steel pipe further comprising 0.1 to 10% in total of Cr, Mo, V, Ni, and Cu by weight%.