Steel for high-hardness shield cutter and manufacturing method thereof

A shield cutting tool and manufacturing method technology, applied in the field of alloy steel manufacturing process, can solve the problems of complex process, unenvironmental protection, long process, etc., and achieve the effects of increasing fatigue resistance, improving hardness and improving toughness

Active Publication Date: 2020-12-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of the shield machine tool steel is as follows: smelting-casting-electroslag remelting-three-dimensional uniform refinement and FM method forging-annealing and ultra-fine treatment, and finally prepare a steel with good toughness, rigidity and wear resistance Steel for shield machine tools, this patented process is complex and long, high energy consumption, low efficiency, and not environmentally friendly

Method used

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  • Steel for high-hardness shield cutter and manufacturing method thereof
  • Steel for high-hardness shield cutter and manufacturing method thereof
  • Steel for high-hardness shield cutter and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Smelting, casting and forging were carried out according to the above composition range, and then the composition of the forged billet was tested, and the composition is shown in Table 1.

[0036] Table 1 Composition of Forging Billets (wt.%)

[0037]

[0038] The forging adopts the following process: the preheating temperature of the forging anvil is 200-250°C, and the ingot is subjected to multi-directional forging in the temperature range of 1100-1200°C; the final forging temperature is ≥900°C, and the tissue type is iron ferrite and pearlite, such as figure 1 (a). Heat treatment: heat the test steel to 1050°C for 30 minutes, then quench it in a salt bath to 200°C, put it in a resistance furnace at 350°C for 30 minutes, and cool it in air. At this time, the structure type is martensite + retained austenite figure 1 (b).

[0039] Table 2 Mechanical properties of shield steel

[0040]

Embodiment 2

[0041]Embodiment 2: Carry out smelting, casting and forging according to the above composition range, and then detect the composition of the forged billet, and the composition 2 is shown in Table 3.

[0042] Table 3 Composition of Forging Billets (wt.%)

[0043]

[0044] The manufacture method of steel is the same as embodiment 1, and heat treatment organization is as figure 2 .

[0045] Table 4 Mechanical properties of shield steel

[0046]

Embodiment 3

[0047] Embodiment 3: The steel composition of this embodiment is the same as that of Embodiment 1. Steel is manufactured as follows:

[0048] The forging adopts the following process: the preheating temperature of the forging anvil is 200-250°C, and the ingot is subjected to multi-directional forging in the temperature range of 1100-1200°C; the final forging temperature is ≥900°C. Heat treatment: heat the test steel to 1050°C for 30 minutes, then quench it in a salt bath to 150°C, then put it in a resistance furnace at 350°C and hold it for 30 minutes, then air cool it out of the furnace. At this time, the structure type is martensite + retained austenite. organized as image 3 .

[0049] Table 5 Mechanical properties of shield steel

[0050]

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Abstract

The invention relates to steel for a high-hardness shield cutter and a preparation method thereof, and belongs to the field of alloy steel manufacture. The steel comprises the following alloy elementsof, in percentage by mass, 0.40-0.60% of C, 0.80-1.20% of Si, 0.20-0.60% of Mn, 4.00-6.00% of Cr, 1.10-1.30% of Mo, 0.45-1.0% of V, 0.30% of Ni, 0.10-0.60% of Ti, the balance Fe and inevitable impurity elements, wherein the content of S in the impurity elements is smaller than or equal to 0.005%, and the content of P in the impurity elements is smaller than or equal to 0.020%. The steel for the high-hardness shield cutter is forged, carbon is allocated to retained austenite through quenching and allocation heat treatment processes, finally, a martensite and retained austenite complex phase structure stable at the room temperature is obtained, the hardness can reach 55 HRC or above, the room-temperature impact energy exceeds 28 J, the tensile strength is 1800 MPa or above, and a good strength and toughness ratio is achieved. The obtained cutter steel has excellent impact resistance, the technological process is simple, the production period is shortened, energy conservation and environmental protection are achieved, the cost is reduced, and the enterprise competitiveness is improved.

Description

technical field [0001] The invention relates to an alloy steel and a manufacturing method thereof, in particular to a high-hardness shield cutting tool steel and a preparation process thereof, belonging to the technical field of alloy steel manufacturing technology. [0002] technical background [0003] The shield machine is a construction machine widely used in underground engineering and tunneling in recent years. The shield cutter is the key part of the shield machine to break rocks, the teeth of the shield machine, and the direct link between the shield machine and the tunnel face. The contact parts are subject to harsh working conditions and complex forces, so they are extremely worn out, and their performance and life directly affect the construction effect and efficiency of underground projects. Therefore, the tool steel material is required to have sufficient strength, high hardness and good toughness. [0004] At present, the commonly used shield tool steel in Chin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C38/50C21D8/00C21D1/26C21D1/18
CPCC21D1/18C21D1/26C21D8/005C21D2211/001C21D2211/008C22C38/02C22C38/04C22C38/44C22C38/46C22C38/50
Inventor 于浩黎淑英王文超
Owner UNIV OF SCI & TECH BEIJING
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