Bimetal composite pipe semi-finished product and machining method thereof

Abstract

The invention discloses a bimetal composite pipe semi-finished product and a machining method thereof. The bimetal composite pipe semi-finished product comprises an outer metal pipe and an inner metal pipe. The outer metal pipe and the inner metal pipe are respectively provided with a first end opening and a second end opening. The inner metal pipe is arranged in the outer metal pipe in a sleeved mode. A clearance area is arranged between the inner wall of the outer metal pipe and the outer wall of the inner metal pipe. A vent hole is formed in the outer metal pipe, a first sealing device and a second sealing device are arranged at the two end openings of the bimetal pipe respectively, a first plug is arranged at the first end opening of the inner metal pipe, a guide pipe is arranged in the first plug, an inner cavity of the inner metal pipe is communicated with the outside through the guide pipe, a second plug is arranged at the second end opening of the inner metal pipe, a hydraulic sensor and a vent pipe are arranged in the second plug, the hydraulic sensor penetrates through the second plug and extends into the cavity of the inner metal pipe, and the inner cavity of the inner metal pipe is communicated with the outside through the vent pipe. According to the bimetal composite pipe semi-finished product and the machining method thereof, sticking force magnitude between composite pipe layers can be controlled, and bimetal composite pipes meeting the standard requirement can be manufactured.

Description

technical field [0001] The invention relates to a bimetal composite pipe semi-finished product and a processing method. Background technique [0002] Bimetal composite pipe is a cost-effective product that has been widely used in energy, shipbuilding, chemical, petroleum and machinery fields. The bimetal composite pipe is processed by combining two kinds of metal pipes with different material properties and advantages. Its structure is divided into two parts: the metal outer pipe and the metal inner pipe. . Taking the bimetallic composite pipe used in sour oil and gas medium transportation pipelines as an example, the inner pipe is a corrosion-resistant alloy pipe, and the outer pipe is a high-strength line pipe. According to the T6623 standard, the minimum bonding force between the layers of the bimetallic pipe after composite processing should reach 0.2Mpa, and the control of the manufacturing process plays a very important role in this index. At present, the manufactur...

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Problems solved by technology

At present, the manufacturing technology of bimetallic composite pipe includes various processes such as deflagration, spinning, drawing, and hydraulic diameter expansion of outsourcing molds. , effective solutions

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