KR-20260065393-A - PART FOR CONSTRUCTION MACHINERY MADE OF HIGH MANGANESE STEEL

Abstract

One embodiment of the present invention provides a construction machine part made of high-manganese steel, wherein the high-manganese steel material comprises carbon (C), silicon (Si), manganese (Mn), chromium (Cr), nickel (Ni), molybdenum (Mo), and iron (Fe), and wherein the weight percentage of iron (Fe) among the high-manganese steel materials is the largest and the weight percentage of manganese (Mn) is the second largest.

Inventors

• 오정혁
• 김정엽
• 정종권
• 정기환
• 김상목

Assignees

• 에이치디건설기계 주식회사

Dates

Publication Date

20260508

Application Date

20241101

Claims (10)

1. As a construction machinery part made of high-manganese steel, The above high-manganese steel material comprises carbon (C), silicon (Si), manganese (Mn), chromium (Cr), nickel (Ni), molybdenum (Mo), and iron (Fe), and A construction machine part characterized by having the largest weight percentage of iron (Fe) and the second largest weight percentage of manganese (Mn) among the above high-manganese steel materials.
2. In paragraph 1, A construction machine part characterized by the above high-manganese steel material comprising 1.0 to 1.2 weight% carbon (C), 0.3 to 0.6 weight% silicon (Si), 24 to 26 weight% manganese (Mn), 2.0 to 2.2 weight% chromium (Cr), 1.0 to 1.1 weight% nickel (Ni), 0.3 to 0.4 weight% molybdenum (Mo), and the remainder being iron (Fe).
3. In paragraph 2, A construction machine part characterized by the above high-manganese steel material further comprising at least one of phosphorus (P) and sulfur (S).
4. In paragraph 3, A construction machine part characterized by having a weight % of phosphorus (P) of less than 0.05 and a weight % of sulfur (S) of less than 0.010.
5. In paragraph 1, A construction machine part characterized by the above-mentioned high-manganese steel material being water toughened.
6. In paragraph 1, The above construction machine part is characterized by being a part provided in the bucket of an excavator.
7. In paragraph 2, A construction machine part characterized by having a stacking fault energy (SFE) of 12 to 60 mJ/m2 of the high-manganese steel material.
8. In paragraph 2, A construction machine part characterized by the liquidus temperature of the high-manganese steel material being 1400℃ or lower.
9. In paragraph 2, A construction machine part characterized by the cementite content being 20% or less among the high-manganese steel material.
10. In paragraph 2, A construction machine part characterized in that the matrix of the high-manganese steel material is austenite, and when the high-manganese steel material is plastically deformed, twinning is formed within the austenite.

Description

Construction machinery part made of high manganese steel The present invention relates to a part for construction machinery, and more specifically, to a part for construction machinery made of high-manganese steel that has excellent wear resistance due to its Twinning-induced Plasticity (TWIP) and also has excellent impact properties, thereby having a low risk of breakage. Conventionally, wear-resistant cast steel materials were applied to the GET parts of excavators. However, in the case of wear-resistant cast steel parts, as the size increases, the variation in hardness increases, which accelerates the reduction in lifespan due to wear in the working environment. Furthermore, if surface hardness is increased to improve core hardness, impact characteristics are degraded, which increases the risk of damage from impact in the working environment. Figure 1 is a diagram showing an example of heat treatment application by water treatment. FIG. 2 is a microstructure diagram showing a carbide of the high-manganese steel material of the present invention. FIG. 3 is a microstructure diagram showing the TWIP reinforcement effect of the high-manganese steel material of the present invention. Figure 4 is a graph showing the results of a soil abrasion test according to manganese content for the Examples and Comparative Examples 1 to 4. Figure 5 is a graph showing the results of a soil abrasion test according to the Mn/C ratio for the Examples and Comparative Examples 1 to 4. Figure 6 is a graph showing the tensile test results according to manganese content for the Examples and Comparative Examples 1 to 4. FIG. 7 is a graph showing the tensile test results according to the Mn/C ratio for the Examples and Comparative Examples 1 to 4. FIG. 8 is a graph showing the impact test results according to manganese content for the Examples and Comparative Examples 1 to 4. FIG. 9 is a graph showing the impact test results according to the Mn/C ratio for the Examples and Comparative Examples 1 to 4. Figure 10 is a graph showing the results of a vehicle mounting test of a side protector component when the high-manganese steel material of the present invention is applied to a side protector. Hereinafter, a preferred embodiment of a construction machinery part made of high-manganese steel according to the present invention will be described with reference to the attached drawings. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intention or practice of the user or operator; additionally, the following embodiments are not intended to limit the scope of the present invention but are merely exemplary details of the components presented in the claims of the present invention. To clearly explain the present invention, parts unrelated to the description have been omitted, and the same reference numerals are used for identical or similar components throughout the specification. Throughout the specification, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may additionally include other components. In addition, components referred to as '~parts' throughout the specification may consist of two or more components combined into a single component, or a single component may be divided into two or more components based on more detailed functions. Furthermore, each component described below may additionally perform some or all of the functions performed by other components in addition to its primary function, and it goes without saying that some of the primary functions performed by each component may be exclusively performed by other components. The high-manganese steel material applied to the construction machinery parts of the present invention comprises carbon (C), silicon (Si), manganese (Mn), chromium (Cr), nickel (Ni), molybdenum (Mo), and iron (Fe). Among the high-manganese steel materials, the weight percentage of iron (Fe) is the largest, and the weight percentage of manganese (Mn) is the second largest. In particular, the high-manganese steel material of the present invention preferably comprises 1.0 to 1.2 weight% carbon (C), 0.3 to 0.6 weight% silicon (Si), 24 to 26 weight% manganese (Mn), 2.0 to 2.2 weight% chromium (Cr), 1.0 to 1.1 weight% nickel (Ni), 0.3 to 0.4 weight% molybdenum (Mo), and the remainder iron (Fe). Carbon (C) improves the fluidity of the molten metal and is dissolved within the austenite phase, thereby improving mechanical properties through solid solution strengthening. However, if added in excess of the solid solution limit, it forms carbides along with carbide-promoting elements. To suppress the formation of carbides that promote excessive carbide formation or material brittleness, it must be added within 1.0 to 1.2 weight percent. Additionally, carbon (C) is one of the elements that significantly affects stacking