A kind of quenched and tempered coiled tubing steel, hot-rolled steel strip, steel pipe and manufacturing method thereof

Abstract

The invention discloses a quenched and tempered steel for coiled tubing, which contains the following chemical elements in the following mass percentages: C: 0.15-0.35%, Si: 0.08-0.30%, Mn: 0.50-1.80%, P≤0.015% , S≤0.005%, Cr: 0.40‑0.80%, Nb: 0.01‑0.05%, Ti: 0.01‑0.03%, Mo: 0.05‑0.38%, B: 0.0003‑0.0015%, Ca: 0.001‑0.004%, Al: 0.01‑0.05%, 0<N≤0.006%. In addition, the invention also discloses a hot-rolled steel strip made of the above-mentioned quenched and tempered steel for coiled tubing, and discloses a manufacturing method of the oil casing. In addition, the present invention also discloses a steel pipe made from the above-mentioned hot-rolled steel strip. The quenched and tempered coiled tubing steel according to the present invention effectively controls the alloy cost, and the hot-rolled steel strip produced by the steel has low strength. Has good shape, toughness and processing properties. The steel pipe prepared from the low-strength hot-rolled steel strip in the present invention has ultra-high strength, uniform structure and properties, and good fatigue life and corrosion resistance.

Description

technical field

[0001] The invention relates to a metal material and a manufacturing method thereof, in particular to a steel grade, a steel strip, a steel pipe and a manufacturing method thereof. Background technique

[0002] Quenched and tempered coiled tubing (CT) is relative to conventional threaded tubing, which is a jointless coiled tubing formed by mitering several sections of steel strips, rolled, formed and welded. Known as coiled tubing, coiled tubing, coiled tubing, or coiled tubing. The advantages of coiled tubing in oilfield operations are very prominent. It has developed rapidly in the past ten years and is widely used in oil and gas field workover, drilling, completion, logging and other operations. It is known as the "universal operating machine".

[0003] With the development of oil and gas operations and the advancement of drilling and completion technologies, deep wells, high-pressure wells, and horizontal wells have gradually increased. At present, there...

Examples

Embodiment 1-6 and comparative example 1-2

[0080] Table 1 lists the mass percentages of various chemical elements in the quenched and tempered coiled tubing steels of Examples 1-6 and the steels of Comparative Examples 1-2.

[0081] Table 1. (wt%, the balance is Fe and other inevitable impurities except P, S)

[0082]

[0083]

[0084] The quenched and tempered coiled tubing steels of Examples 1-6 of the present invention and the steels of Comparative Examples 1-2 can be correspondingly produced corresponding hot-rolled steel strips. The following Examples 1-1 to 6- 1 represents the hot-rolled steel strips prepared by using the quenched and tempered coiled tubing steels of Examples 1-6 and the steels of Comparative Examples 1-2, respectively.

[0085] The hot-rolled steel strips of Example 1-1 to Example 6-1 and the hot-rolled steel strips of Comparative Example 1-1 and Comparative Example 2-1 were obtained by the following steps:

[0086] (1) smelting and continuous casting: wherein in the smelting step, electr...

technical field

[0001] The invention relates to a metal material and a manufacturing method thereof, in particular to a steel grade, a steel strip, a steel pipe and a manufacturing method thereof. Background technique

[0002] Quenched and tempered coiled tubing (CT) is relative to conventional threaded tubing, which is a jointless coiled tubing formed by mitering several sections of steel strips, rolled, formed and welded. Known as coiled tubing, coiled tubing, coiled tubing, or coiled tubing. The advantages of coiled tubing in oilfield operations are very prominent. It has developed rapidly in the past ten years and is widely used in oil and gas field workover, drilling, completion, logging and other operations. It is known as the "universal operating machine".

[0003] With the development of oil and gas operations and the advancement of drilling and completion technologies, deep wells, high-pressure wells, and horizontal wells have gradually increased. At present, there...

Examples

Embodiment 1-6 and comparative example 1-2

[0080] Table 1 lists the mass percentages of various chemical elements in the quenched and tempered coiled tubing steels of Examples 1-6 and the steels of Comparative Examples 1-2.

[0081] Table 1. (wt%, the balance is Fe and other inevitable impurities except P, S)

[0082]

[0083]

[0084] The quenched and tempered coiled tubing steels of Examples 1-6 of the present invention and the steels of Comparative Examples 1-2 can be correspondingly produced corresponding hot-rolled steel strips. The following Examples 1-1 to 6- 1 represents the hot-rolled steel strips prepared by using the quenched and tempered coiled tubing steels of Examples 1-6 and the steels of Comparative Examples 1-2, respectively.

[0085] The hot-rolled steel strips of Example 1-1 to Example 6-1 and the hot-rolled steel strips of Comparative Example 1-1 and Comparative Example 2-1 were obtained by the following steps:

[0086] (1) smelting and continuous casting: wherein in the smelting step, electr...

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