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High ductility steel strip for J55 petroleum sleeve and manufacturing method thereof

A technology of oil casing, high strength and toughness, applied in the field of microalloy steel, which can solve the problems of no clear requirements for microalloying elements, poor threadability, high cost, etc., and achieve good weldability, excellent weldability, and improved strength.

Inactive Publication Date: 2008-07-02
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are several problems in this invention: the first component is designed to add vanadium micro-alloy, and the cost is relatively high; the second component is designed to use low-carbon design, and users generally report that when the carbon is low, the threading property is poor, and sticking is prone to occur
[0008] The standard composition requirements are relatively loose; there are no clear requirements for C, Si, Mn and microalloying elements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: The thickness specification is 6.8mm.

[0034] A high-strength and toughness J55 steel belt for petroleum casing. The composition and weight percentage of the steel are:

[0035] C: 0.16%, Si: 0.24%, Mn: 1.18%, P: 0.017%, S: 0.004%, Nb: 0.036%, Ti: 0.020%, Al: 0.035%, the rest is Fe and trace impurities.

[0036] A method for manufacturing high-strength and toughness J55 steel belt for petroleum casing. The process includes hot metal pretreatment (mixing furnace)---120t top and bottom combined blowing converter---LF (ladle refining furnace)---medium and thin slab continuous casting ---Slab heating---1500 wide-band material;

[0037] Specific steps are as follows:

[0038] 1) Hot metal pretreatment

[0039] The molten iron is desulfurized by spraying magnesium particles in the molten iron tank, the molten iron sulfur is controlled below 0.010%, the temperature is not lower than 1280 ℃, and the slag on the surface of the molten iron is removed after desulfurization...

Embodiment 2

[0053] A high-strength and toughness J55 steel belt for petroleum casing. The composition and weight percentage of the steel are:

[0054] C: 0.15%, Si: 0.21%, Mn: 1.10%, P: 0.013%, S: 0.006%, Nb: 0.028%, Ti: 0.018%, Al: 0.034%, the rest is Fe and trace impurities.

[0055] The manufacturing method is the same as in Example 1. The relevant performance parameters of the steel of Example 2 are listed in Table 1.

[0056] Table 1 Related parameters of the physical properties of steel such as strength, tensile properties, other related properties, etc.

[0057]

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Abstract

A steel strip for J55 petroleum casing with high strength and high toughness petroleum casing and a manufacture method thereof belong to the field of micro-alloyed steel production technology. The method comprises converter smelting, LF refining, medium-thin slab continuous slab, heating, high-pressure water descaling, hot rolling and laminar cooling, and reeling, wherein the chemical components of steel comprise (wt%) C 0.15 to 0.20, Si 0.15-0.30, Mn 1.00 to 1.45, P not larger than 0.020, S not larger than 0.010, Nb 0.020 to 0.040, Ti 0.015 to 0.040, Al 0.020 to 0.050, and allowance Fe and other in inevitable impurities. A J55 petroleum casing with a yield strength of 420 MPa can be produced by combining Nb and Ti, micro-alloying and reasonable production process, and the product has the advantages of high strength, high toughness and good solderability.

Description

Technical field [0001] The invention relates to a steel belt for high-strength and toughness J55 petroleum casing pipe and a manufacturing method thereof, and belongs to the technical field of microalloy steel. Background technique [0002] Petroleum casing pipes have always been seamless pipes. With the development of steel microalloying and controlled rolling and cooling technology, high-strength hot-rolled steel strips have obtained excellent comprehensive performance. After welding, they can completely replace seamless pipes. It has the advantages of high dimensional accuracy, strong anti-extrusion performance, high toughness, no perforation cracking and low price, etc., and the actual application effect is good. [0003] At present, there are still two forming methods for the production of J55 oil casing, seamless pipe and welded pipe. Domestic Baosteel Steel Pipe, Panzhihua Steel, Tianjin Steel Pipe, Chengdu Seamless, Baotou Steel Seamless and other plants all use continuou...

Claims

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Application Information

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IPC IPC(8): C22C38/14B21B1/26C21C7/064C21C5/28B22D11/00
Inventor 周平张君法汤化胜霍孝新亓伟伟杨旭俎勇刘军张桂南
Owner LAIWU IRON & STEEL GRP
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