CN-121992311-A - Component for construction machine made of high manganese steel

Abstract

An embodiment of the present invention provides a component for an engineering machine, which is made of a high manganese steel material, wherein the high manganese steel material includes carbon (C), silicon (Si), manganese (Mn), chromium (Cr), nickel (Ni), molybdenum (Mo), and iron (Fe), and the high manganese steel material has the maximum weight% of iron (Fe) and the second maximum weight% of manganese (Mn).

Inventors

• WU ZHENGHE
• Jin Tingye
• ZHENG ZHONGQUAN
• ZHENG JIHUAN
• JIN XIANGMU

Assignees

• 现代英维高株式会社
• HD现代建设机械株式会社

Dates

Publication Date

20260508

Application Date

20251030

Priority Date

20241101

Claims (10)

1. 1. A part for engineering machinery is made of high manganese steel material and is characterized in that, The high manganese steel material comprises carbon, silicon, manganese, chromium, nickel, molybdenum and iron, In the high manganese steel material, the weight percent of iron is the largest, and the weight percent of manganese is the second largest.
2. 2. The component for construction machine according to claim 1, wherein, The high manganese steel material comprises 1.0 to 1.2 weight percent of carbon, 0.3 to 0.6 weight percent of silicon, 24 to 26 weight percent of manganese, 2.0 to 2.2 weight percent of chromium, 1.0 to 1.1 weight percent of nickel, 0.3 to 0.4 weight percent of molybdenum and the balance of iron.
3. 3. The component for construction machine according to claim 2, wherein, The high manganese steel material further comprises at least one of phosphorus and sulfur.
4. 4. A component for a construction machine according to claim 3, wherein, The wt% of phosphorus is less than 0.05 and the wt% of sulfur is less than 0.010.
5. 5. The component for construction machine according to claim 1, wherein, The high manganese steel material is subjected to water toughening treatment.
6. 6. The component for construction machine according to claim 1, wherein, The component for construction machine is a component provided in a bucket of an excavator.
7. 7. The component for construction machine according to claim 2, wherein, The stacking fault energy of the high manganese steel material is 12-60 mJ/m 2 .
8. 8. The component for construction machine according to claim 2, wherein, The liquidus temperature of the high manganese steel material is below 1400 ℃.
9. 9. The component for construction machine according to claim 2, wherein, The content of cementite in the high manganese steel material is below 20%.
10. 10. The component for construction machine according to claim 2, wherein, The matrix of the high manganese steel material is austenite, and when the high manganese steel material is plastically deformed, twin crystals are generated in the austenite.

Description

Component for construction machine made of high manganese steel Technical Field The present invention relates to a component for an engineering machine, and more particularly, to a component for an engineering machine, which is made of a high manganese steel material, has excellent wear resistance and impact properties due to its reinforcement properties (TWIP; twinning induced Plasticity, twinning induced plasticity), and is low in risk of breakage. Background Conventionally, a GET component of an excavator is made of a wear-resistant cast steel material, and the wear-resistant cast steel component tends to be larger in size, and the hardness deviation is larger, so that the life of the component is shortened in a working environment, and if the surface hardness is increased to increase the deep hardness, the impact property is lowered, and the risk of breakage due to impact in the working environment is increased. Disclosure of Invention Technical problem The invention aims to provide a part for engineering machinery, which is made of high manganese steel, has excellent wear resistance and excellent impact property by virtue of strengthening characteristics (TWIP; twinning induced Plasticity, twinning induced plasticity), and has low damage risk. The technical problems to be solved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned will be clearly understood from the following description to those having ordinary knowledge in the art to which the present invention pertains. Technical proposal In order to solve the above problems, an embodiment of the present invention provides a component for a construction machine, which is made of a high manganese steel material including carbon (C), silicon (Si), manganese (Mn), chromium (Cr), nickel (Ni), molybdenum (Mo) and iron (Fe), wherein the high manganese steel material has the largest wt% of iron (Fe) and the second largest wt% of manganese (Mn). According to an embodiment, the high manganese steel material includes 1.0 to 1.2 wt% of carbon (C), 0.3 to 0.6 wt% of silicon (Si), 24 to 26 wt% of manganese (Mn), 2.0 to 2.2 wt% of chromium (Cr), 1.0 to 1.1 wt% of nickel (Ni), 0.3 to 0.4 wt% of molybdenum (Mo), and the balance of iron (Fe). According to an embodiment, the high manganese steel material further comprises at least one of phosphorus (P) and sulfur (S). According to an embodiment, the wt% of phosphorus (P) is below 0.05 and the wt% of sulfur (S) is below 0.010. According to an embodiment, the high manganese steel material is water-toughened (water toughening). According to an embodiment, the component for construction machine is a component provided in a bucket of an excavator. According to an embodiment, the high manganese steel material has a Stacking Fault Energy (SFE) of 12 to 60mJ/m 2. According to an embodiment, the liquidus temperature of the high manganese steel material is 1400 ℃ or less. According to an embodiment, the content of cementite (cementite) in the high manganese steel material is 20% or less. According to an embodiment, the matrix of the high manganese steel material is austenite (austenite), and when the high manganese steel material is plastically deformed, twinning (twinning) is generated inside the austenite. ADVANTAGEOUS EFFECTS OF INVENTION According to the present invention, parts for construction machinery, particularly parts corresponding to mechanical fastening without welding, are made of high manganese steel, so that they are excellent in wear resistance by virtue of twinning strengthening property (TWIP), and can exert strengthening Effect even if new surfaces are exposed due to wear, so that wear resistance can be maintained continuously, and adverse effects due to Size Effect (Size Effect) can be minimized. In addition, the impact performance is also excellent, and the damage risk of parts can be reduced. Finally, the service life of the parts for the engineering machinery can be prolonged. It is to be understood that the effects of the present invention are not limited to the above-described effects, but include all effects derivable from the constitution of the invention described in the detailed description of the present invention or the claims. Drawings Fig. 1 is a diagram showing an example of application of heat treatment by water toughening treatment. Fig. 2 is a microstructure view showing carbide of high manganese steel according to the present invention. Fig. 3 is a microstructure view showing the appearance of the TWIP strengthening effect of the high manganese steel material according to the present invention. Fig. 4 is a graph showing the results of the soil and sand wear test corresponding to the manganese content for examples and comparative examples 1 to 4. Fig. 5 is a graph showing soil and sand abrasion test results corresponding to the Mn/C ratio (manganese-carbon ratio) for examples and comparative examples 1 to 4. Fig. 6 i