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Process for producing rotary drill creeper tread material

A technology of roller cone drilling rigs and track shoes, which is applied in the field of materials for mining roller cone drilling rigs, can solve problems such as high brittleness, and achieve the effects of increased service life, low manufacturing cost, and easy operation

Inactive Publication Date: 2005-04-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, various alloy cast irons (such as nickel hard cast iron and high chromium cast iron) have good wear resistance, but are relatively brittle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A medium-carbon low-alloy cast steel whose material composition is 0.29% by weight C, 0.6% by weight Cr, 1.0% by weight Mn, 0.6% by weight Si, 0.03% by weight RE (rare earth), and P and S less than 0.04% by weight is prepared by an intermediate frequency induction furnace . When the molten steel is overheated to 1610°C, insert 0.4% of the weight of the molten steel for aluminum deoxidation, tap the steel at 1590°C, and pour at a temperature of 1550°C. Use water glass surface dry sand molding.

[0019] After the sample is kept at 845°C for 50 minutes + 740°C for 25 minutes, it is quenched in water, and then tempered at 525°C for 60 minutes. The mechanical properties are σ b is 956MPa, σ s is 880MPa, δ is 13%, ψ is 35%, α k 48J / cm 2 , HRC is 37.

Embodiment 2

[0021] The material composition is 0.31% by weight of C, 0.7% by weight of Cr, 1.2% by weight of Mn, 0.7% by weight of Si, 0.2% by weight of Mo, 0.035% by weight of RE (rare earth), and P and S are less than 0.04% by weight. Carbon low alloy cast steel. When the molten steel is overheated to 1600°C, insert 0.5% of the weight of the molten steel for aluminum deoxidation, tap the steel at 1590°C, and pour at a temperature of 1550°C. Use water glass surface dry sand molding.

[0022] After the sample is kept at 845°C for 70 minutes + 740°C for 35 minutes, it is quenched in water, and then tempered at 535°C for 55 minutes. The mechanical properties are σ b is 1110MPa, σ s 930MPa, δ is 15.8%, ψ is 38%, α k 51J / cm 2 , HRC is 42.

Embodiment 3

[0024] The material composition is 0.34% by weight of C, 0.8% by weight of Cr, 1.1% by weight of Mn, 0.8% by weight of Si, 0.4% by weight of Mo, 0.05% by weight of RE (rare earth), and P and S are less than 0.04% by weight. Carbon low alloy cast steel. When the molten steel is overheated to 1620°C, insert 0.3% of the weight of the molten steel for aluminum deoxidation, tap the steel at 1600°C, and pour at a temperature of 1545°C. Use water glass surface dry sand molding.

[0025] After the sample is kept at 855°C for 70 minutes + 735°C for 40 minutes, it is water quenched, and then tempered at 537°C for 68 minutes. The mechanical properties are σ b is 1190MPa, σ s is 1120MPa, δ is 18%, ψ is 50%, α k 56J / cm 2 , HRC is 44.

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Abstract

The present invention is process of preparing material for track block of rotary drilling machine. The material contains C 0.28-0.34 wt%, Cr 0.6-0.8 wt%, Mn 1.0-1.2 wt%, Si 0.5-0.9 wt%, Mo 0-0.4 wt%, RE 0.03-0.05 wt% and P+S less than 0.04 wt% and is smelted in MF inducing electric furnace. The preparation process includes deoxidation with Al in the amount of 0.3-0.6 wt% of molten steel while the molten steel is heated to overheat of 1600-1620 deeg.c, tapping at 1580-1600 deg.c, casting at 1530-1560 degg.c, forming in surface dry water glass sand mold, heating to 840-860 deg.c, maintaining for 50-70 min, lowering in the furnace to 720-750 deg.c, temperature equalization for 0.5 hr, water quenching outside the furnace, tempering at 520-540 deg.c for 50-70 min. The present invention has the advantages of high toughness, low cost, simple production process and long service life.

Description

technical field [0001] The invention belongs to the technical field of materials for mining roller cone drilling rigs, and in particular provides a method for preparing track shoe materials for roller cone drilling rigs, which is used for the track shoes of the roller cone drilling rig, which helps to reduce the production cost of the track shoes and improve the service life of the track shoes . Background technique [0002] The roller cone drilling rig is a kind of high-efficiency piercing equipment used in open-pit mining. In the past, my country's demand for large drilling rigs mainly relied on imports. In recent years, domestic organizations have successfully developed medium and small roller cone drilling rigs with independent intellectual property rights on the basis of digesting similar foreign models. After these drilling rigs are put into large and medium-sized open-pit mines, they have greatly improved the perforation process of open-pit mines in my country. How...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/18C22C38/22
Inventor 杨滨罗继文陈国香金子敏谢丰隆
Owner UNIV OF SCI & TECH BEIJING
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