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A kind of m65 resistance welded petroleum casing and its manufacturing method

A technology for oil casing and electric resistance welding, applied in the field of steel for oil casing, can solve the problems of poor weldability and impact toughness, high carbon and manganese content, and achieve the effects of good weldability, low tempering temperature and consistency guarantee

Active Publication Date: 2017-09-29
ANGANG STEEL CO LTD
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Problems solved by technology

[0009] The invention discloses an M65 grade electric resistance welded petroleum casing and a manufacturing method thereof, in order to solve the technical problems existing in the production of straight seam electric resistance welded petroleum casing M65, for example: high carbon and manganese content, poor weldability and impact toughness, high temperature Temper brittleness and other issues

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  • A kind of m65 resistance welded petroleum casing and its manufacturing method
  • A kind of m65 resistance welded petroleum casing and its manufacturing method
  • A kind of m65 resistance welded petroleum casing and its manufacturing method

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Embodiment Construction

[0028] The chemical composition of the present invention is proportioned as follows by weight percentage: C: 0.13%-0.17%, Si: 0.15%-0.30%, Mn: 0.80%-1.20%, P: ≤0.020%, S: ≤0.008%, Cr: 0.30%-0.40%, Ti: 0.010%-0.030%, Als: 0.02%-0.05%, N: ≤0.008%, and the rest are Fe and unavoidable elements.

[0029] The present invention adopts the following production process, which includes molten iron pretreatment, molten steel smelting, refining outside the furnace, continuous casting of slab, reheating of continuous casting slab, rolling, cooling, coiling, ERW pipe making and heat treatment of the whole pipe. The specific process is as follows :

[0030] 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 desulfurization treatment and calcium treatment to control the shape of inclusions and improve the ductility, toughness and Cold bending performance, cont...

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Abstract

The invention discloses an M65 grade electric resistance welded petroleum casing and a manufacturing method thereof. The chemical composition thereof is in the following ratio by weight percentage: C: 0.13%-0.17%, Si: 0.15%-0.30%, Mn: 0.80%-1.20 %, P: ≤0.020%, S: ≤0.008%, Cr: 0.30%‑0.40%, Ti: 0.010%‑0.030%, Als: 0.02%‑0.05%, N: ≤0.008%, the rest is Fe and unavoidable impurity elements. Process features: slab heating at 1150-1200°C, finish rolling temperature at 780-840°C, cooling rate at 10-15°C / s, coiling temperature at 570-640°C, steel strip is made by high frequency / medium frequency resistance welding by ERW unit For steel pipe, the whole tube is heated to 890-930°C, kept warm for 30-50min, and quenched in water; the whole pipe is heated to 520-620°C, kept warm for 60-80min, and water-cooled and tempered. The advantages and effects of the present invention are: the steel strip has good impact toughness; Good weldability and high efficiency; the consistency of pipe body and weld performance is guaranteed; the tempering temperature of pipe body heat treatment is low, saving energy.

Description

technical field [0001] The invention belongs to the technical field of oil casing steel, and relates to an ERW (ERW, Electric Resistance Weld, resistance welding) casing and a manufacturing method thereof, in particular to an API SPEC 5CT steel grade of M65 oil casing and a manufacturing method thereof. The performance of the as-rolled steel strip is J55, and the performance of the whole pipe after quenching and tempering is M65 steel grade. Background technique [0002] Oil casing is one of the most commonly used oil-specific pipes in oil fields. It consumes a lot of money and costs a lot. It is an indispensable construction material in oil and gas field drilling and production operations. In 2010 alone, it reached 2.5 million tons. Compared with seamless pipes, ERW casing has significant advantages such as uniform wall thickness, high dimensional accuracy, good perforation performance, strong collapse resistance, and low cost. ERW casing is welcomed by manufacturers and oi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28C21D8/10C21D1/25
Inventor 黄明浩黄国建孔祥磊张英慧
Owner ANGANG STEEL CO LTD
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