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Method for producing J55-grade steel for petroleum casing based on electric furnace sheet billet continuous casting an rolling process

A technology of thin slab continuous casting and petroleum casing, applied in the field of alloy steel production, can solve problems such as no successful experience, achieve the effect of improving the comprehensive performance of steel strip, meeting high strength and high toughness, and improving welding performance

Inactive Publication Date: 2006-12-27
GUANGZHOU PEARL RIVER STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Adopt electric furnace thin slab continuous casting and rolling process to develop and produce C content 0.15~0.22Wt.%, Nb, Ti composite microalloy J55 steel grade oil casing steel, there is no successful experience in China

Method used

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  • Method for producing J55-grade steel for petroleum casing based on electric furnace sheet billet continuous casting an rolling process
  • Method for producing J55-grade steel for petroleum casing based on electric furnace sheet billet continuous casting an rolling process
  • Method for producing J55-grade steel for petroleum casing based on electric furnace sheet billet continuous casting an rolling process

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Experimental program
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Effect test

Embodiment 1

[0037] The electric furnace thin slab continuous casting and rolling process used is: electric furnace smelting, refining, thin slab continuous casting, casting slabs solidified and directly entering the roller hearth heating or soaking furnace, high pressure water descaling, hot rolling, laminar cooling, coiled.

[0038]The chemical composition range of molten steel is: C: 0.16~0.20%, Si: 0.15~0.30%, Mn: 0.85~1.10%, P: 0.01~0.02%, S: 0.003~0.008%, Nb: 0.040%, Ti: 0.022% .

[0039] Thin slab continuous casting and rolling process parameters are: continuous casting casting speed: 3.8-4.6m / min, slab entering furnace temperature: 980-1050°C, soaking temperature: 1160-1200°C, start-rolling temperature: 1080-1120°C , Final rolling temperature: 800-860°C, strong cooling mode, coiling temperature: 550-600°C.

[0040] The organization of the steel belt see figure 1 , the grain size and properties of the strip are shown in Table 1.

[0041] Strip thickness

Embodiment 2

[0043] The electric furnace thin slab continuous casting and rolling process used is: electric furnace smelting, refining, thin slab continuous casting, casting slabs solidified and directly entering the roller hearth heating or soaking furnace, high pressure water descaling, hot rolling, laminar cooling, coiled.

[0044] The chemical composition range of molten steel is: C: 0.16~0.20%, Si: 0.15~0.30%, Mn: 1.0~1.2%, P: 0.01~0.02%, S: 0.005~0.010%, Nb: 0.05%, Ti: 0.033 %.

[0045] Thin slab continuous casting and rolling process parameters are: continuous casting casting speed: 3.8-4.4m / min, slab entering furnace temperature: 980-1050°C, soaking temperature: 1160-1200°C, start-rolling temperature: 1080-1120°C , Final rolling temperature: 830-880°C, coiling temperature: 600-650°C.

[0046] The organization of the steel belt see figure 2 , the grain size and properties of the strip are shown in Table 2.

[0047] Strip thickness

Embodiment 3

[0049] The electric furnace thin slab continuous casting and rolling process used is: electric furnace smelting, refining, thin slab continuous casting, casting slabs solidified and directly entering the roller hearth heating or soaking furnace, high pressure water descaling, hot rolling, laminar cooling, coiled.

[0050] The chemical composition range of molten steel is: C: 0.18-0.22%, Si: 0.25-0.40%, Mn: 0.70-0.90%, P: 0.01-0.02%, S: 0.008-0.015%, Nb: 0.06%, Ti: 0.025% .

[0051] Thin slab continuous casting and rolling process parameters are: continuous casting casting speed: 4.0-4.4m / min, slab entering furnace temperature: 980-1050℃, soaking temperature: 1160-1200℃, start-rolling temperature: 1090-1130℃ , Final rolling temperature: 800-850°C, strong cooling mode, coiling temperature: 550-600°C.

[0052] The organization of the steel belt see image 3 , the grain size and properties of the strip are shown in Table 3.

[0053] Strip thickness

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Abstract

The invention relates to a method for producing J55 steel used in oil sleeve, based on furnace sheet blank continuous casting rolling process, wherein the invention uses electric furnace to smelt, refine, continuously cast the sheet blank and, and solidifies the casting blank, to feed it to rolling heating or uniformly heating furnace, then removes scales with high-pressure water, hot rolls, laminated cools, and coils. The chemical components of steel water comprises (wt %): C in 0.15-0.22%, Si <=0.45%, Mn in 0.70-1.60%, P<=0.025%, S<=0.020%, Nb<=0.06% and Ti<=0.035%. The invention can make C content between 0.15-0.22wt percent, to produce the J55 steel as Nb and Ti alloy, with high strength, high flexibility and welding property.

Description

technical field [0001] The invention relates to the technical field of alloy steel production, in particular to a method for producing J55 steel grade oil casing steel based on an electric furnace thin slab continuous casting and rolling process. Background technique [0002] J55 steel grade is an important oil casing steel grade in the API 5CT standard of the United States. It is an important material in the process of oil and natural gas exploitation. Its consumption is large, accounting for more than 50% of the oil casing steel. Casing is a long-term use of oil pipes in one downhole. It is connected into thousands of meters of pipe strings by special threads. During the downhole and cementing process, it mainly bears external extrusion force, internal pressure and axial tensile load. The casing string completed by the perforation method also has to bear the high temperature and high energy instantaneous impact load generated when the perforating charge explodes. The main...

Claims

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Application Information

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IPC IPC(8): E21B17/00C22C38/04B21B1/46B21B37/74B22D11/16
Inventor 毛新平徐志如李春艳庄汉洲许传棻张金星王进步陈明陈云任崇锐
Owner GUANGZHOU PEARL RIVER STEEL & IRON
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