Steel material for CT80 level coiled tubing and manufacturing method thereof

A manufacturing method and oil pipe technology, applied in the field of oil pipe steel manufacturing, can solve the problems of increasing heat treatment process, increasing cost, etc., and achieve the effect of grain refinement, increase of fineness, and inhibition of grain growth
CN102899581AActive Publication Date: 2013-01-30LAIWU IRON & STEEL GRP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
LAIWU IRON & STEEL GRP
Publication Date
2013-01-30

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Abstract

The invention belongs to the technical field of tubing steel manufacturing, and particularly relates to a steel material for a CT80 level coiled tubing and a manufacturing method thereof. The steel material comprises the following chemical components in percentage by mass: carbon: 0.11 to 0.13%, silicon: 0.30 to 0.40%, manganese: 0.70 to 0.90%, chromium: 0.50 to 0.60%, nickel: less than or equal to 0.25%, Mo: 0.13 to 0.15%, copper: 0.30 to 0.40 %, niobium: 0.02 to 0.04%, and the balance being iron and inevitable impurities, wherein nitrogen is less than or equal to 0.004%, phosphorus is less than or equal to 0.015% and sulfur is less than or equal to 0.005% in the purities. The manufacturing method comprises the following steps: the alloy is smelted, a solid core metal calcium cored wire is used for final deoxidation in the smelting process, and then the controlled rolling and controlled cooling rolling is carried out after an ingot is formed, and the finished product is a 4.5mm strip. The steel material provided by the invention has the advantages of complete deoxidation, fine grain and uniform microstructure, and better yield strength, elongation and hardness value.
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Description

[0001] technical field

[0002] The invention belongs to the technical field of oil pipe steel manufacturing, and in particular relates to a CT80 steel material for coiled oil pipe and a manufacturing method thereof. Background technique

[0003] Coiled tubing (Coiled Tubing, referred to as CT) is also called flexible tubing, coiled tubing or serpentine tubing. Compared with conventional tubing that is threaded to go downhole, it consists of several sections of flexible tubing with a length of more than 100 meters. The continuous pipe without joints welded by butt welding or skew welding process can reach hundreds of meters or thousands of meters in total length. In recent years, major domestic oilfields have introduced coiled tubing to carry out related oilfield operations, and the dependence on CT technology has gradually increased.

[0004] The steel used for coiled tubing was originally mainly carbon steel. Because the strength of CT material at that time was not high, ...

Claims

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