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Smelting method of 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 effect of improving the level of product flaw detection, good mechanical properties, and high cleanliness

Inactive Publication Date: 2019-07-09
吴红霞
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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

[0047] 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;

[0048] 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%;

[0049] (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 high-strength alloy steel smelting process for drill bit and pump head body materials. By adjusting the adding sequence of alloy materials, Mo and Ni are added in the primary smelting stage of an electric arc furnace, and a decarburization amount is increased; in a LF refining stage, a novel complex deoxidizer is used for purifying steel ingots, and the mechanical property is improved; aluminum is added before vacuum degassing refining (VD), so molten steel alloying is promoted, the molten steel alloying process is more sufficient, and oxide inclusions can be reduced. The steel ingot has the advantages of high cleanliness, good surface quality and hardenability, fine grain size and the like; the steel ingot is high in strength, high-pressure-resistant, corrosion-resistant and good in mechanical property. In the smelting process, a good deoxidation effect can be obtained without an electroslag remelting procedure, meanwhile, the content of non-metallic inclusions is reduced, the flaw detection level of a product is improved, energy consumption is reduced on the premise that the use performance is guaranteed, and the 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 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): C22C33/04C21C5/52C21C7/064C21C7/068C21C7/06C21C7/10C22C38/44C22C38/04C22C38/02
CPCC21C5/5264C21C7/0006C21C7/06C21C7/064C21C7/068C21C7/10C21C2007/0093C22C33/04C22C38/02C22C38/04C22C38/44Y02P10/20
Inventor 吴红霞
Owner 吴红霞
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