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High Cr Cast Roadheader Tool Steel and Its Manufacturing Process

A manufacturing process and technology of roadheading machines, which are applied in the field of tool steel manufacturing, can solve problems such as difficult access to imported tools, and achieve the effects of saving processing hours, reducing production costs, and improving stability against high temperature tempering

Active Publication Date: 2019-09-03
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, domestic roadheader cutting tool production companies have also started one after another (the components are shown in Table 2), such as China Shield Engineering Tool Co., Ltd., Luoyang Jiujiu Technology Co., Ltd., China Railway Tunnel Equipment Manufacturing Co., Ltd., etc., but most Some are still in the imitation stage, and it is difficult to meet the standards of imported knives

Method used

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  • High Cr Cast Roadheader Tool Steel and Its Manufacturing Process
  • High Cr Cast Roadheader Tool Steel and Its Manufacturing Process
  • High Cr Cast Roadheader Tool Steel and Its Manufacturing Process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) The chemical composition of the new high-Cr cast roadheader tool steel is by weight percentage:

[0046] C: 0.307; Cr: 8.151; Mo: 1.272; Ni: 0.564; V: 0.665; Mn: 0.131; Si: 0.648;

[0047] (2) The heat treatment process scheme and mechanical properties of this embodiment are shown in Table 4.

[0048] The high-Cr cast roadheader tool steel is mainly composed of lath martensite and retained austenite after heat treatment in schemes 2 to 4, and its mechanical properties have reached or exceeded that of forged high-carbon H13 roadheader tool steel. Among them, after the heat treatment of process plan 3, the impact toughness is increased by 19.4%, the tensile strength is increased by 6.8%, the yield strength is increased by 12.7%, and the elongation is increased by 18.0%. Oxidation at 550°C for 60 hours in the air environment increases the weight of forging. 42.4% of H13 steel; after 10,000 thermal cycles at 550°C → 25°C, the length and number of thermal fatigue cracks...

Embodiment 2

[0057] (1) The chemical composition of high-Cr cast roadheader tool steel is by weight percentage:

[0058] C: 0.415; Cr: 10.163; Mo: 2.171; Ni: 1.233; V: 0.804; Mn: 0.235; Si: 0.706;

[0059] (2) The heat treatment process characteristics of the new high-Cr cast roadheader tool steel are shown in Table 6.

[0060] After the heat treatment of the new high-Cr cast roadheader tool steel in schemes 2 to 4, the microstructure is mainly lath martensite and retained austenite, and its mechanical properties have met or exceeded that of forged high-carbon H13 roadheader tool steel. Among them, after the heat treatment process scheme 3, the hardness increased by 1.5HRC, the impact toughness increased by 17.8%, the tensile strength increased by 13.5%, the yield strength increased by 19.5%, and the elongation increased by 13.8%. Oxidation at 550°C in the air environment 60-hour oxidation weight gain is 40.5% of that of forged H13 steel; after 10,000 thermal cycles at 550°C → 25°C, the o...

Embodiment 3

[0067] (1) The chemical composition of the new high-Cr cast roadheader tool steel is by weight percentage:

[0068] C: 0.547; Cr: 11.89; Mo: 2.880; Ni: 1.692; V: 0.947; Mn: 0.384; Si: 0.771;

[0069] (2) The heat treatment process characteristics of the new high-Cr cast roadheader tool steel are shown in Table 8.

[0070] After the heat treatment of the new high-Cr cast roadheader tool steel through heat treatment schemes 1 to 3, the structure is mainly lath martensite, and at the same time, high-carbon acicular martensite appears in different degrees, and the plasticity and toughness decrease. Compared with forged high-carbon H13 roadheader tool steel, the hardness is increased by 2-3HRC, the tensile strength is increased by 8.3%-11.5%, and the yield strength is increased by 13.2%-19.5%. When the quenching temperature is higher than 1100 °C, quenching cracks on the surface of the sample are more obvious. Oxidation at 550°C for 60 hours in an air environment is 50.7% of that...

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Abstract

The invention relates to high-Cr-content cast heading machine cutter steel. The cutter steel comprises the chemical components of, by weight, 0.30%-0.55% of C, 8.0%-12.0% of Cr, 1.2%-3.0% of Mo, 0.5%-1.8% of Ni, 0.6%-1.0% of V, 0.1%-0.4% of Mn, 0.6%-0.8% of Si, 0.04%-0.30% of N, no more than 0.005% of S, no more than 0.03% of P and the balance Fe. The cutter steel manufacturing technique comprisesthe following steps that a near-net shape blank of a cutter is obtained through precise casting, then heat treatment is conducted, and a finished product is obtained directly after fine machining. Yield strength and tensile strength are improved while the hardness, impact toughness and elongation of the cutter steel all can reach the level of domestic forged heading machine cutter steel; the oxidation corrosion resistant capability, thermal fatigue resistant performance and abrasive grain abrasion resistance are improved; and the production period is shortened, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of cutting tool steel manufacturing, and relates to a novel high-Cr cast roadheader cutting tool steel and a manufacturing process thereof. Background technique [0002] The cutter is the key component of the rock-breaking excavation of the roadheader, and it is also a consumable item. In the case of hard rock, more than 200 cutting tools of the roadheader are changed every month; the single-track tunnel of Guangzhou Metro Line 7 from Hanxi Changlong to Hezhuang is 1739 meters long, and the rock in most sections is hard rock. A total of 1097 single knives and 92 double knives have been replaced in the project. The cost of simple knives accounts for a large part of the construction cost, and it also seriously affects the construction progress (it takes about 1 hour to replace a knife), so the quality of the knives is directly related to the quality of the knives. Affect the rock-breaking ability and tunnelin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C38/46C22C38/04C22C38/02C22C33/06C21D1/18C21D1/74C21D9/22
Inventor 王金国房钦平姜启川闫瑞芳王慧远
Owner JILIN UNIV
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