Medium-carbon vanadium-containing alloy steel for drill rod and preparation method thereof

A technology of alloy steel and drill rod, which is applied in the field of alloy structural steel, and can solve problems such as wear resistance, poor high-temperature durable strength, and short service life of drill rods.

Active Publication Date: 2017-12-01
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the alloy steel hardenability in the above-mentioned prior art, wear resistance and high-temperature durable strength difference, the problem of aspects such as short service life of drill rod, propose a kind of medium carbon vanadium-containing alloy steel for drill rod and its Preparation method; this plan is aimed at the service conditions and performance requirements of the drill rod. By using medium carbon steel as the matrix and adding a certain amount of Mn, Cr, Mo, V, Al elements, the design concept of the composition is reasonable, and the production process is reasonably designed to ensure the high cleanliness of the material. And the high uniformity of the composition makes the material have good processing performance (heat treatment performance), good hardenability, wear resistance and high high temperature durable strength, and has certain corrosion resistance, which improves the service life of the material

Method used

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  • Medium-carbon vanadium-containing alloy steel for drill rod and preparation method thereof
  • Medium-carbon vanadium-containing alloy steel for drill rod and preparation method thereof
  • Medium-carbon vanadium-containing alloy steel for drill rod and preparation method thereof

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Embodiment 1

[0049] A kind of preparation method of medium-carbon vanadium-containing alloy steel for drill rod comprises the following steps:

[0050] 1) Electric furnace smelting: The raw materials for the furnace are molten iron and scrap steel, and alloys such as silicomanganese, high manganese, high chromium, and ferromolybdenum are added according to the specified composition ratio for ladle alloying. The proportion of molten iron is 68.8%; the scrap steel added is of high quality Scrap steel and added alloys are baked to reduce the substitution of nitrogen, hydrogen and other gases;

[0051] During the smelting process of the electric furnace, foam slag is made to uniformly decarburize, reduce nitrogen absorption, control the tapping end point of the electric furnace to be 0.13%, and P to be 0.008%. The content of residual elements meets the design requirements, and the tapping temperature of molten steel is controlled at 1630°C; Add steel core aluminum 2.0kg / t steel and slagging ma...

Embodiment 2

[0058] A kind of preparation method of medium-carbon vanadium-containing alloy steel for drill rod comprises the following steps:

[0059] 1) Electric furnace smelting: The raw materials into the furnace are molten iron and scrap steel, and alloys such as silicomanganese, high manganese, high chromium, and ferromolybdenum are added according to the specified composition ratio for ladle alloying. The proportion of molten iron is 71%; the added scrap steel is High-quality steel scrap, the added alloys are baked to reduce the substitution of nitrogen, hydrogen and other gases;

[0060]In the electric furnace smelting process, the foamed slag is made to uniformly decarburize, reduce nitrogen absorption, control the tapping end of the electric furnace to 0.15%, P to 0.007%, the content of residual elements meets the design requirements, and the tapping temperature of molten steel is controlled at 1650°C; During the steel process, 2.2kg / t of steel core aluminum and 11kg / t of slag-fo...

Embodiment 3

[0067] A kind of preparation method of medium-carbon vanadium-containing alloy steel for drill rod comprises the following steps:

[0068] 1) Electric furnace smelting: The raw materials into the furnace are molten iron and steel scrap, and alloys such as silicomanganese, high manganese, high chromium, and ferromolybdenum are added according to the specified composition ratio for ladle alloying. The proportion of molten iron is 70%; the added scrap steel is of high quality Scrap steel and added alloys are baked to reduce the substitution of nitrogen, hydrogen and other gases;

[0069] During the smelting process of the electric furnace, foam slag is produced to uniformly decarburize, reduce nitrogen absorption, control the end point C of electric furnace tapping to 0.16%, and P to 0.007%. The content of residual elements meets the design requirements, and the tapping temperature of molten steel is controlled at 1635°C; Add steel core aluminum 2.2kg / t steel and slagging materia...

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Abstract

The invention provides vanadium-containing medium-carbon alloy steel for a drill rod and a preparation method of the vanadium-containing medium-carbon alloy steel. The alloy steel comprises, by weight, 0.33-0.38% of C, 0.17-0.37% of Si, 0.50-0.70% of Mn, 1.00-1.20% of Cr, 0-0.025% of P, 0-0.020% of S, 0.20-0.30% of Mo, 0.10-0.15% of V, 0.015-0.060% of Al, 0-0.0015% of O and the balance Fe and inevitable impurities. The preparation method comprises the steps of electric furnace smelting, LF refining, VD vacuum degassing treatment, casting blank pouring through integral tundish continuous casting, hot charging rolling and round steel preparation. The vanadium-containing medium-carbon alloy steel for the drill rod has great machining performance, good hardenability and abrasion resistance, high high-temperature endurance strength, and corrosion resistance to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of alloy structural steel, and in particular relates to a medium-carbon vanadium-containing alloy steel for a drill rod and a preparation method thereof. Background technique [0002] Drilling tool is a slender rod system composed of drill head, drill rod, drill tail and other components. It is used for drilling in mining, energy construction, traffic road construction, hydropower project construction, urbanization construction and other fields The main tool for rock drilling. As a component that transmits the impact energy of the rock drill, the drill rod is subject to the interaction of three stresses: axial tensile stress, torsional stress, and bending stress, and is prone to fatigue fractures; and during the drilling process, high temperatures will be generated. It will aggravate and deteriorate the working environment of the drill rod; depending on the load and rock solidity, the service life of the dr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/24C22C38/22C22C38/04C22C38/02C22C38/06C22C33/06C21D8/06C21C7/10C21C7/06C21C7/064C21C7/068
CPCC21C7/0006C21C7/0056C21C7/06C21C7/064C21C7/068C21C7/10C21D8/065C22C33/06C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24
Inventor 袁淑君戈文英梁娜郑桂芸欧阳峥容张海霞
Owner SHANDONG IRON & STEEL CO LTD
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