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Smelting method for high-strength alloy steel

A smelting method and alloy steel technology, applied in the field of metallurgy, can solve the problems that are difficult to meet and meet the technical quality requirements of customers, and achieve the effects of improving the level of product flaw detection, reducing energy consumption, and fine grain size

Inactive Publication Date: 2016-01-27
丁春燕
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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

[0046] 1) With a smelting capacity of 30 tons, first add 0.55-0.6 tons of small crushed ore (mainly composed of Fe2O3, content 60wt%-70wt%) and 0.65-0.7 tons of lime (calcium oxide) to the bottom of the electric arc furnace for early production slag, and then put 28.5-28.7 tons of low-sulfur phosphorus clean steel (in which iron content ≥ 98wt%, carbon content ≤ 0.2wt%, sulfur and phosphorus content ≤ 0.05wt% respectively), electrified melting, adding carburant to mix carbon, so that The carbon content reaches 0.78%; 132 kg Mo and 750 kg Ni are added during the melting period;

[0047] Blow oxygen into the molten steel, and add 0.3-0.4 tons of small crushed ore or scale and 0.45-0.5 tons of lime to the molten steel in 2 to 4 times. Oxidation and smelting at 1560±20°C for 1 to 1.5 hours for decarburization and dephosphorization; at the end of the oxidation period, the decarburization amount is ≥0.4%;

[0048] (2) Pour the molten steel after dephosphorization and decarburizatio...

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Abstract

The invention relates to the field of metallurgy, in particular to a smelting process for high-strength alloy steel used for the material of drilling bits and pump head bodies. The sequences in which an alloy material is added are adjusted, Mo and Ni are added in the electric-arc furnace primary melting stage, and decarburization quantity is increased. A practical and novel compound deoxidizer is used in the ladle refining furnace (LF) refining stage to purify a steel ingot and improve the mechanical property. Before vacuum degassing refining (VD), aluminum is added to promote alloying of molten steel and make the alloying process of the molten steel more sufficient, and oxide inclusions can also be reduced. The steel ingot has the advantages of being high in cleanliness, good in surface quality and hardenability, fine in grain size and the like. The steel ingot is high in strength, resistant to high pressure and corrosion, and good in mechanical property. In the process, a good deoxygenation effect can be obtained without the electroslag remelting procedure, and meanwhile the content of the nonmetallic inclusions is reduced, so that the crack detection level of the product is improved. On the premise that the service performance is ensured, the energy consumption is reduced, and the cost is lowered.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a high-strength alloy steel smelting process 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 high-strength alloy carburizing steel, such as Ni -Cr-Mo system and Ni-Mo system. [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 properties, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/064C21C7/068C21C7/06C21C7/10
CPCY02P10/20
Inventor 丁春燕
Owner 丁春燕
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