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J55-grade low-yield-ratio steel for electric resistance welding casing pipe and manufacturing method of J55-grade low-yield-ratio steel

A technology with low yield ratio and manufacturing method, applied in J55 grade ERW oil casing steel and its manufacturing field, can solve the problems of general weldability, impact toughness and formability, high yield strength, low tensile strength, etc. The yield strength is not significantly improved, the yield strength is low, and the tensile strength is high.

Active Publication Date: 2016-06-22
ANGANG STEEL CO LTD
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  • Application Information

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Problems solved by technology

[0018] The present invention aims at the technical problems existing in the current production of J55 grade ERW oil casing steel, such as high C content, high yield strength, low tensile strength, general weldability, impact toughness and formability, etc., and provides a direct Steel for seam resistance welding oil casing and its manufacturing method, especially low yield ratio J55 grade ERW oil casing steel with good weldability, impact toughness and formability, and its manufacturing method

Method used

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  • J55-grade low-yield-ratio steel for electric resistance welding casing pipe and manufacturing method of J55-grade low-yield-ratio steel
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  • J55-grade low-yield-ratio steel for electric resistance welding casing pipe and manufacturing method of J55-grade low-yield-ratio steel

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Embodiment Construction

[0039] Its chemical composition (weight, %) ratio is as follows: C: 0.090% ~ 0.128%, Si: 0.10% ~ 0.35%, Mn: 1.02% ~ 1.25%, P: ≤0.015%, S: ≤0.008%, Nb: 0.01% to 0.03%, Ti: 0.010% to 0.030%, Cr: 0.30% to 0.40%, Als: 0.02% to 0.06%, N: ≤0.008%, and the rest are Fe and unavoidable elements.

[0040] Its characteristics are:

[0041] 1) Smelting and continuous casting process: molten iron pretreatment, converter smelting - through top blowing or top-bottom composite blowing, refining outside the furnace - LF furnace light desulfurization treatment, and calcium treatment to control the shape of inclusions and improve the ductility of steel, Toughness and cold bending performance, continuous casting of slabs to make continuous casting slabs - continuous casting adopts electromagnetic stirring or dynamic light reduction to improve the quality of continuous casting slabs.

[0042] 2) Rolling process: the continuous casting slab is heated to 1160-1200°C by the heating furnace, and then...

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Abstract

The invention discloses J55-grade low-yield-ratio steel for an electric resistance welding casing pipe and a manufacturing method of the J55-grade low-yield-ratio steel. The J55-grade low-yield-ratio steel comprises chemical components including, by weight percent, 0.090%-0.128% of C, 0.10%-0.35% of Si, 1.02%-1.25% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.008% of S, 0.01%-0.03% of Nb, 0.010%-0.030% of Ti, 0.30%-0.40% of Cr, 0.02%-0.06% of Als, smaller than or equal to 0.008% of N and the balance Fe and inevitable elements. The method is characterized in that a continuous casting sheet billet is heated to 1160-1200 DEG C through a heating furnace, and the final rolling temperature in the first stage is larger than 980 DEG C; the rolling starting temperature in the second stage ranges from 980 DEG C to 1020 DEG C, and the final rolling temperature ranges from 810 DEG C to 865 DEG C; laminar flow intermittent cooling is adopted for a rolled steel strip, and the cooling speed ranges from 12 DEG C / s to 18 DEG C / s; and coiling is conducted at the temperature ranging from 590 DEG C to 680 DEG C. The J55-grade low-yield-ratio steel has the beneficial effects that the carbon content is relatively low, and weldability and the impact toughness are good; and a proper number of Cr alloy is added, the safety of a steel pipe is good, and it is ensured that the yield strength and the tensile strength meet the standard requirement.

Description

technical field [0001] The invention relates to a steel for straight seam electric resistance welded oil casing (ERW / HFW for short) and a manufacturing method thereof, in particular to a J55 grade ERW oil casing steel with a low yield ratio in APISPEC5CT and a manufacturing method thereof. Background technique [0002] Oil casing is one of the most commonly used oil-specific pipes in oil fields. The annual demand is about 800,000 to 1 million tons, accounting for more than 40% of the total steel used in the oil industry. It is an indispensable construction in oil and gas field drilling operations. Material. Compared with seamless pipes, ERW casings have significant advantages such as uniform wall thickness, high dimensional accuracy, good perforation performance, strong collapse resistance, and low cost. In particular, J55 grade ERW casings have mostly replaced traditional seamless pipes. Seam steel pipe. [0003] APISpec5CT stipulates that the yield strength of J55 grade ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C21D8/02
Inventor 黄明浩黄国建孔祥磊张英慧栗锐
Owner ANGANG STEEL CO LTD
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