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Preparation method of V150-steel-grade high-strength high-toughness casing steel

A technology of high strength and toughness, casing steel, applied in the field of seamless petroleum casing steel smelting process, to achieve the effect of high steel purity, lightening of LF deep desulfurization load, and high strength and toughness matching

Active Publication Date: 2015-08-12
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the invention relates to the composition design and preparation process of steel, its final product is 150ksi steel grade high-strength toughness steel pipe, and does not involve the control method of the casting process of the concrete billet

Method used

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  • Preparation method of V150-steel-grade high-strength high-toughness casing steel
  • Preparation method of V150-steel-grade high-strength high-toughness casing steel
  • Preparation method of V150-steel-grade high-strength high-toughness casing steel

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preparation example Construction

[0034] The preparation method of V150 steel grade high-strength toughness casing steel comprises the following steps:

[0035] a. Smelting: Using molten iron and steel scrap as raw materials, smelting in an electric arc furnace to obtain primary molten steel at a temperature of 1620-1640°C;

[0036] b. LF refining: Add molten steel smelted in step a to synthetic slag for LF refining. After the synthetic slag is basically melted, add refining agent and Al powder in batches to strengthen slag deoxidation and produce white slag, ensuring that the white slag time is ≥ 20 minutes; control Slag (FeO+MnO)≤0.5%, raise the temperature of molten steel, carry out alloying and desulfurization operations, adjust the alloy composition to meet the standard requirements and S≤0.003%; at the same time, perform the first calcium treatment after LF refining;

[0037] c. VD vacuum treatment: keep the vacuum degree of the molten steel refined in step b at normal pressure ~ 67pa, control the flow r...

Embodiment 1

[0051] ①Using molten iron and steel scrap as raw materials, molten iron composition: C: 3.80%, S: 0.030%, P: 0.100%, As: 0.008%, Sn: 0.004%, As+Sn+Pb+Sb+Bi: 0.017%, into Electric furnace molten iron temperature T: 1300°C; S in scrap steel: 0.008%, As: 0.007%, Sn: 0.004%, As+Sn+Pb+Sb+Bi: 0.016%; mix molten iron and scrap steel according to a certain ratio, control The carbon content is 1.7%.

[0052] ② Smelting in an electric arc furnace after loading molten iron and scrap steel to obtain primary molten steel with P: 0.002%, S: 0.009%, C: 0.08%, and molten steel temperature: 1635°C, and then poured the furnace back for tapping.

[0053] ③Add CaBaAlSi, Al block and ferroalloy during tapping, CaBaAlSi addition: 2.5kg / t, Al block addition: 3.0kg / t, high carbon ferromanganese: 4.5kg / t; add lime 3.0kg / t in the ladle before tapping kg / furnace, during the tapping process, adjust the intensity of argon blowing for stirring, and ensure the unimpeded bottom blowing before LF refining. ...

Embodiment 2

[0061] ①Using molten iron and steel scrap as raw materials, molten iron composition: C: 4.10%, S: 0.040%, P: 0.110%, As: 0.007%, Sn: 0.003%, As+Sn+Pb+Sb+Bi: 0.014%, into Electric furnace molten iron temperature T: 1310°C; S in scrap steel: 0.010%, As: 0.007%, Sn: 0.003%, As+Sn+Pb+Sb+Bi: 0.014%; mix molten iron and scrap steel according to a certain ratio, control The carbon content is 2.0%.

[0062] ② Smelting in an electric arc furnace after loading molten iron and scrap steel to obtain primary molten steel with P: 0.003%, S: 0.014%, C: 0.16%, and molten steel temperature: 1630°C, and then pour the furnace back for tapping.

[0063] ③ Add CaBaAlSi, Al block and ferroalloy during tapping, CaBaAlSi addition: 2.0kg / t, Al block addition: 3.0kg / t, high-carbon ferromanganese: 4.5kg / t; add lime 4.5kg / t to the ladle before tapping kg / furnace, during the tapping process, adjust the intensity of argon blowing for stirring, and ensure the unimpeded bottom blowing before LF refining.

...

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Abstract

The invention relates to a smelting process of seamless petroleum casing steel in iron and steel industries and particularly relates to a preparation method of V150-steel-grade high-strength high-toughness casing steel. The preparation method comprises the following steps: smelting; carrying out LF refining; carrying out VD vacuum processing; and finally casting to prepare a continuous casting round blank. Round tube blank steel prepared by virtue of the preparation method is high in steel purity degree and small in segregation; a seamless steel tube is high in matching degree of strength and toughness, excellent in comprehensive mechanical property and long in service life.

Description

technical field [0001] The invention relates to a seamless petroleum casing steel smelting process in the iron and steel industry, in particular to a preparation method of V150 steel grade high-strength and tough casing steel. Background technique [0002] With the increasing scarcity of oil resources and the increasing demand for oil and gas, in order to obtain more oil resources, the development of oil fields with complex geological conditions and difficult exploitation is intensified; as the depth of oil wells increases, the temperature and pressure in the wells increase accordingly. Significant changes have taken place in the geological environment in which the casing used for cementing and completion has changed. The existing American API standard high-grade steel casing is not suitable for the job. Non-API standard high-strength and toughness casings must be used, such as V150 high-strength and toughness casing. In order to ensure the safe operation of oil wells, highe...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21C7/064C21C7/10B22D11/18B22D11/115
Inventor 蒋世川陈坤
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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