Drill bit housing steel and preparation method thereof

A steel and shell technology, which is applied in the direction of drill bits, earthwork drilling, drilling equipment, etc., can solve the problems of short service life and wear resistance defects of drill bit shells, and improve high temperature mechanical properties, hardness and wear resistance properties, good strength and wear resistance

CN111500927APending Publication Date: 2020-08-07ZHEJIANG PULANKA ROCK TOOLS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-08-07

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Abstract

The invention discloses drill bit housing steel and a preparation method thereof, and relates to the technical field of rock drilling tools. The steel is prepared from the chemical components: 0.22-0.34% of C, 0.10-0.35% of Si, 0.40-0.60% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 1.10-1.40% of Cr, 0.20-0.45% of Mo and 3.90-4.30% of Ni. Chromium in the steel enhances the hardenability of the steel and has a secondary hardening effect, a drill bit housing has good corrosion resistance and oxygen resistance, and the hardness and wear resistance of high carbon steel are improved without embrittling the steel. Meanwhile, through the adoption of chromium, the high-temperature mechanical properties of the steel are improved, and the performance impact of high temperature generated in the rock drilling process on the drill bit housing is reduced. In terms of chemical components, vanadium is replaced with chromium, so that more uniform strength, toughness andfatigue strength of the drill bit housing are obtained, and better strength and wear resistance of the drill bit housing are obtained. Meanwhile, through the proportion adjustment of other metal elements, the drill bit housing is more suitable for rock drilling in limestone areas.
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Description

technical field

[0001] The invention relates to the technical field of rock drilling tools, more specifically, it relates to the steel material of the drill bit shell and its preparation method. Background technique

[0002] The drill bit is a kind of drilling tool used for rock drilling construction, and is widely used in various mining projects and stonework projects.

[0003] The Chinese patent with the notification number CN205618084U discloses a threaded drill bit, which includes a drill bit shell arranged in a cylindrical shape, a number of buttons are arranged on the top of the drill bit shell, and the outer peripheral surface of the drill bit shell is located on the drill bit. Both ends of the shell diameter are respectively provided with a positioning hole and a positioning post matched with the positioning hole, and a fixing part for fixing the positioning post is arranged in the positioning post.

[0004] The Chinese patent whose publication number is CN1034396A ...

Examples

Embodiment 1

[0050] A steel material for the drill bit shell, the chemical composition of which is shown in Table 3.

[0051] Such as figure 1 Shown, the preparation method of this drill bit shell comprises the following steps:

[0052] S1, ironmaking, reducing sintered ore to molten iron in a blast furnace, the temperature of the blast furnace is 1500-1700°C;

[0053] S2, steelmaking, alloy raw materials are weighed according to the weight ratio of each element, and the alloy raw materials are put into molten iron in the converter or electric furnace to make steel. The temperature of the ladle is 1550-1650 ° C. The molten steel after smelting is in the LF refining furnace and VD furnace for refining treatment, the refined molten steel is poured into continuous casting slabs in the continuous casting machine, and the steelmaking-continuous casting cycle is 6h;

[0054] S3, steel rolling, the temperature of the heating furnace is 900-1100°C, the continuous casting slab is heated by the he...

Embodiment 2

[0071] The difference from Example 1 is that the chemical composition of the drill bit shell steel is shown in Table 3.