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Steel for high-plasticity continuous oil pipe and manufacturing method thereof

A manufacturing method and high plasticity technology, applied in the direction of temperature control, etc., can solve the problems of cost reduction, expensive production, high alloy content, etc., and achieve the effects of low rolling mill loss, favorable promotion and application, and high purity

Active Publication Date: 2008-04-30
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the shortcomings of the existing stainless steel coiled tubing, such as high alloy content and expensive production, the invention provides a steel for coiled tubing and casing with high plasticity, adjusts the type of alloy, reduces the amount of precious metals added, and uses the production technology of micro-alloyed steel to obtain the required The microstructure and properties can effectively reduce the cost of steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] High plastic coiled tubing steel with a yield strength of 485Mpa, the chemical composition of the steel (smelting analysis) by weight percentage is: C 0.14%, Si 0.15%, Mn 0.20%, Nb 0.015%, Ti 0.025%, Mo0% , Cu 0.30%, Cr 0.20%, P 0.022%, S 0.001%, others are iron and unavoidable inclusion elements. Its chemical composition is shown in Steel 1 in Table 1.

[0035] The manufacturing method of the above-mentioned steel includes the following steps: converter smelting-RH vacuum degassing-LF furnace refining-continuous casting-slab heating-rolling-controlled cooling-coiling, the specific parameters are controlled as follows:

[0036] Steelmaking process control:

[0037] (1) Pretreatment of molten iron: the S content of molten iron entering the furnace is ≤0.004%;

[0038] (2) Refining outside the furnace: RH vacuum treatment, the treatment time is 15 minutes;

[0039] (3) Denaturation treatment of inclusions: Feed CaSi wire in the ladle furnace, the feeding amount is 700 ...

Embodiment 2

[0047]Yield strength is the high plastic coiled tubing steel of 485Mpa grade, and embodiment 1 is different, and the chemical composition (melting analysis) of steel is by weight percentage: C 0.11%, Si 0.30%, Mn 0.50%, Nb 0.04 %, Ti 0.008%, Mo 0.05%, Cu 0.15%, Cr 0.40%, P 0.008%, S0.004%, others are iron and inevitable inclusion elements. Its chemical composition is shown in Steel 2 in Table 1.

[0048] The manufacturing method of above-mentioned steel is identical with the step in embodiment 1, difference is that concrete parameter control is:

[0049] Steelmaking process control:

[0050] (1) Pretreatment of molten iron: the S content of molten iron entering the furnace is 0.003%;

[0051] (2) Refining outside the furnace: RH vacuum treatment, the treatment time is 20 minutes;

[0052] (3) Denaturation treatment of inclusions: Feed CaSi wire in the ladle furnace, the feeding amount is 750 g / ton, and the feeding speed is 270m / min;

[0053] Controlled rolling and controll...

Embodiment 3

[0060] High plastic coiled tubing steel with a yield strength of 555Mpa, the chemical composition of the steel (smelting analysis) by weight percentage is: C 0.04%, Si 0.40%, Mn 1.20%, Nb 0.06%, Ti 0.01%, Mo 0.20 %, Cu 0.25%, Cr 0.40%, P 0.008%, S 0.003%, others are iron and unavoidable inclusion elements. Its chemical composition is shown in Steel 3 in Table 1.

[0061] The manufacturing method of above-mentioned steel is identical with the step in embodiment 1, difference is that concrete parameter control is:

[0062] (1) Pretreatment of molten iron: the S content of molten iron entering the furnace is 0.001%;

[0063] (2) Refining outside the furnace: RH vacuum treatment for 30 minutes;

[0064] (3) Denaturation treatment of inclusions: Feed CaSi wire in the ladle furnace, the feeding amount is 800 g / ton, and the feeding speed is 250m / min;

[0065] Controlled rolling and controlled cooling process control:

[0066] (1) The reheating temperature of the slab is 1270°C; ...

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Abstract

The invention provides a high-plastic continuous oil jacket steel and a manufacturing method thereof. The chemical composition of steel (smelting analysis) is calculated by weight percentage: C 0.04~0.14%, Si 0.15~0.40%, Mn 0.20~1.20%, Nb 0.015~0.06%, Ti 0.008~0.025%, Mo 0~0.20% , Cu 0.15-0.30%, Cr 0.20-0.50%, P 0.008-0.022%, S 0.001-0.004%, and others are iron and unavoidable inclusion elements. The specific manufacturing method involves two aspects of steelmaking process control and controlled rolling and controlled cooling process control. The cost of the steel obtained by the method of the present invention is greatly reduced, not only the produced steel has moderate strength and toughness, but also due to the micro-alloyed steel controlled rolling and controlled cooling process, the production is simple and easy, the structure uniformity of the steel is good, and due to the micro-alloyed steel The deformation resistance of the alloy steel is small during the rolling process, and the loss to the rolling mill is small, which is beneficial to popularization and application.

Description

technical field [0001] The invention relates to a steel for oil pipes and a manufacturing method thereof. Background technique [0002] As early as the mid-1970s, the emergence of the world's oil energy crisis made the majority of petroleum scientists aware that the day when the non-renewable underground oil and gas resources were exhausted was not far away, so they began to pay attention to those deeper, smaller, more complex, exploration resources. Develop more difficult subterranean formations. It has become a very urgent task to develop new drilling technology and develop and utilize deeper underground resources. [0003] Since the introduction of coiled tubing into oil well operations in the early 1960s, because it has changed the traditional drilling rig operation method, a technological revolution is brewing in the oil field. Especially since the 1990s, coiled tubing operation technology has developed rapidly. Due to its convenient relocation and installation, small...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C33/04C21D8/10B21B37/74
Inventor 孔君华郑琳郭斌谢华桂洲孔勇江汪晓川陈洪伟刘小国
Owner 武汉钢铁有限公司
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