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Hollow steel for vanadium microalloyed rock drilling and preparation method thereof

An alloying and hollowing technology, applied in the direction of metal rolling, temperature control, etc., can solve problems such as affecting the life of rock drilling, and achieve the effect of uniform and fine structure

Active Publication Date: 2022-02-18
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 a vanadium microalloyed hollow steel for rock drilling and a preparation method thereof. The chemical composition of the steel is calculated by mass fraction: C 0.80-0.85%, Si 0.30-0.60%, Mn 0.20%-0.35 %, Cr 0.85-0.95%, V 0.05-0.15%, and the rest are Fe and unavoidable impurities; the method: use the components for smelting and continuous casting to obtain a billet; perforate the center of the billet, and load the core material Obtain a raw material billet; heat the raw material billet, then rough-roll and finish-roll, and air-cool to room temperature to obtain a hollow steel for vanadium microalloyed rock drilling; heating soaking temperature 1100-1180°C, total heating time ≤ 2h; rough rolling The inlet temperature is 1000-1050℃, the finish rolling outlet temperature is 800-900℃; the air cooling speed is greater than>0.3℃ / s. The prepared steel has no reticular carbide, uniform and fine structure, and high 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 Patents(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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