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Hollow steel for vanadium microalloyed rock drilling and preparation method thereof

An alloying and vanadium micro technology, applied in metal rolling, temperature control and other directions, can solve problems such as affecting the life of rock drilling, and achieve the effect of uniform and fine structure

Active Publication Date: 2021-03-26
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Comparative Document 1: Publication No. CN103147013A, patent application titled "A Hollow Steel for Rock Drilling Tools", which provides a hollow steel with a low-cost formula. The chromium content is 1.45-1.55%, and the chromium content is too high It is easy to form large carbides, which affects the life of rock drilling, and can only be used on low-grade drill rods

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  • Hollow steel for vanadium microalloyed rock drilling and preparation method thereof
  • Hollow steel for vanadium microalloyed rock drilling and preparation method thereof
  • Hollow steel for vanadium microalloyed rock drilling and preparation method thereof

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preparation example Construction

[0044]According to another optional embodiment of the present invention, a method for preparing the vanadium microalloyed hollow steel for rock drilling is provided, such as Figure 5 Shown, described preparation method comprises:

[0045] S1. Smelting and continuous casting the molten steel with the chemical composition of the vanadium microalloyed hollow steel for rock drilling to obtain a billet;

[0046] S2. Perforating the center of the steel billet, and putting the core material into the hole to obtain a raw steel billet;

[0047] S3. Heating the raw steel slab, followed by rough rolling and finish rolling, and air cooling to room temperature to obtain hollow steel for vanadium microalloyed rock drilling; wherein, the heating soaking temperature is 1100-1180°C, and the total heating time ≤2h; the inlet temperature of the rough rolling is 1000-1050°C, the outlet temperature of the finish rolling is 800-900°C; the air cooling rate is greater than>0.3°C / s.

[0048] The pr...

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Abstract

The invention discloses hollow steel for vanadium microalloyed rock drilling and a preparation method thereof. The steel comprises the following chemical ingredients in percentage by mass: 0.80 percent to 0.85 percent of C, 0.30 percent to 0.60 percent of Si, 0.20 percent to 0.35 percent of Mn, 0.85 percent to 0.95 percent of Cr, 0.05 percent to 0.15 percent of V, and the balance of Fe and inevitable impurities. The method comprises the following steps: performing smelting and continuous casting on components to obtain steel billets; perforating the centers of the steel billets, and loading core materials to obtain raw material steel billets; heating the raw material steel billets, performing post-rough rolling and refined rolling, and performing air-cooling to room temperature so as to obtain the hollow steel for vanadium microalloyed rock drilling; performing heating to ensure that the heat-balance temperature is at 1100 DEG C to 1180 DEG C and the total heating time is less than orequal to 2h; and ensuring that the rough rolling inlet temperature is at 1000 DEG C to 1050 DEG C, the refined rolling outlet temperature is at 800 DEG C to 900 DEG C, and the air-cooling speed is greater than 0.3 DEG C / s. The prepared steel non-mesh carbide has the advantages of being uniform and fine in tissues and long in average service life.

Description

technical field [0001] The invention relates to the technical field of steel preparation, in particular to a vanadium microalloyed hollow steel for rock drilling and a preparation method thereof. Background technique [0002] Rock drilling tools are widely used in mining fields such as mines and coal mines. The entire drilling tool system includes four categories: drill rods, drill bits, connecting sleeves and drill tails. The drill rod is used as a force-bearing part when drilling a rock drill, and the material is required to have the characteristics of high strength, wear resistance, good fatigue and impact resistance. The drill rod is generally made of hollow steel. After decades of development, the hollow steel grade has formed three major component systems, among which the high carbon system is represented by 95CrMo, the medium carbon system is represented by 55SiMnMo, and the low carbon system is represented by 22CrNi3Mo. It can basically meet the use environment of d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C22C38/02C22C38/04C22C38/22B21B1/08B21B3/02B21B37/74
CPCC22C38/24C22C38/02C22C38/04C22C38/22B21B1/08B21B3/02B21B37/74
Inventor 邓素怀王全礼熊家泽张慧峰李永金李舒笳唐文龙刘厚权宫翠
Owner SHOUGANG CORPORATION
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