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Smelting process of high-strength alloy steel

An alloy steel, high-strength technology, applied in the field of high-strength alloy steel smelting process, can solve problems such as difficulty in meeting and meet customer technical quality requirements, improve product flaw detection, reduce non-metallic inclusion content, and reduce costs. Effect

Active Publication Date: 2015-05-13
浙江大江合金钢钢管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the molten steel cannot be further purified, so it is difficult to meet and meet the customer's requirements for the technical quality of special and important products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) With a smelting volume of 30 tons, first add 0.55 to 0.6 tons of small crushed ore (main component Fe) to the bottom of the electric arc furnace. 2 O 3 , the content of 60wt%~70wt%) and 0.65~0.7 tons of lime (calcium oxide) are used for early slagging, and then 28.5~28.7 tons of low-sulfur phosphorus clean steel (including iron content ≥98wt%, carbon content ≤0.2wt%, Sulfur and phosphorus content ≤ 0.05wt% respectively), energize and melt, add carbonizer to mix carbon, so that the carbon content reaches 0.78%; add 132 kg of Mo and 750 kg of Ni during the melting period;

[0045] Blow oxygen into molten molten steel, add 0.3 to 0.4 tons of small crushed ore or iron oxide scale, and 0.45 to 0.5 tons of lime to molten molten steel 2 to 4 times, and flow slag (slag change) while making slag. Oxidative smelting at 1560±20℃ for 1 to 1.5 hours for decarburization and dephosphorization; the decarburization amount at the end of the oxidation period is ≥0.4%;

[0046] (2) P...

Embodiment 2

[0067] (1) With a smelting volume of 30 tons, first add 0.5 to 0.55 tons of small crushed ore (main component Fe) to the bottom of the electric furnace 2 O 3 ) and 0.7-0.8 tons of lime are used for early slagging, and then 28.4-28.6 tons of low-sulfur phosphorus clean scrap steel (including iron content ≥ 98wt%, carbon content ≤ 0.2wt%, sulfur and phosphorus content respectively ≤ 0.05wt%), Power on and melt, add recarburizer to mix carbon, so that the carbon content reaches 0.85%; add 153 kg of Mo and 795 kg of Ni during the melting period;

[0068] Add blown oxygen to molten steel, add 0.3 to 0.4 tons of small crushed ore or iron oxide scale and 0.45 to 0.5 tons of lime to molten steel 2 to 4 times, and carry out slag flow (slag replacement) at the same time as slag making, at 1560 Decarburization and dephosphorization of smelting at ±20℃ for 1-1.5 hours; decarburization amount at the end of oxidation period ≥0.4%;

[0069] (2) Pour the molten steel after decarburization a...

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Abstract

The invention relates to the field of metallurgy and in particular relates to a process for smelting high-strength alloy steel used as a material of a drill bit and a pump head body. By adjusting an addition sequence of alloy materials, Mo and Ni are added in a primary smelting stage of an electric arc furnace, and decarbonisation quantity is increased; a double deoxidizer is added in a refining stage of an LF (low frequency) furnace, a steel ingot is purified, and mechanical property is improved; and aluminium is added before vacuum degassing (VD) refining is carried out, so that alloying of molten steel is promoted, a molten steel alloying process is more complete, and oxide inclusion also can be reduced. The steel ingot has the advantages of high cleanliness, good surface quality and hardenability and fine grain size; and the steel ingot is high in strength, resistant to high pressure and corrosion and good in mechanical properties. In the process for smelting high-strength alloy steel, good deoxygenation effect can be obtained without an electroslag remelting process, content of nonmetallic inclusion is also reduced, fault detection level of a product is improved, energy consumption is reduced while usability is guaranteed, and cost is reduced.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a high-strength alloy steel smelting process used for drill bits and pump head body materials. Background technique [0002] Oil exploration drill bits include roller cone bits, scraper bits, diamond bits, etc. Among them, roller cone bits account for more than 90% of the oil drilling usage in various countries. The steel used is generally low-carbon and high-strength alloy carburized steel, such as Ni -Cr-Mo series and Ni-Mo series. [0003] In the process of oil drilling, it is greatly affected by geological conditions, especially complex landforms, and the requirements for drill pipe materials are also high. Generally, it is made of American standard 4330V material, which is equivalent to the domestic brand 30CrNiMoV material. This material is also used for the pump head of the multi-cylinder plunger pump. Therefore, this material must have excellent comprehensive mechanical proper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06
CPCY02P10/20
Inventor 金雪荣金秀
Owner 浙江大江合金钢钢管有限公司
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