Production method for high strength low entrainment pipeline steel

A production method and pipeline steel technology, applied in the field of metal materials, can solve problems such as unstable mechanical properties, low product yield, and difficult process control, and achieve the effects of reducing the formation of inclusions, improving production efficiency, and saving process costs

Inactive Publication Date: 2018-08-03
温州市赢创新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From a long-term point of view, the controlled rolling and controlled cooling process cannot completely replace the heat treatment. This is because the future pipeline steel will develop towards a higher strengthening direction. With the improvement of performance indicators, the controlled a controlled cooling process is used to produce steel plates There will be problems such as difficult process control, low production efficiency, low product yield, and unstable mechanical properties.

Method used

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  • Production method for high strength low entrainment pipeline steel
  • Production method for high strength low entrainment pipeline steel

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Experimental program
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Effect test

Embodiment 1

[0050] A production method of high-strength and low-inclusion pipeline steel, characterized in that: the composition of pipeline steel is C 0.065%, Si0.1%, Mn 1.75%, P≤0.015%, S≤0.005%, Nb 0.04%, V 0.02% , Ti 0.001%, Al≤0.050%, Cr 0.5%, Mo 0.25%, Ni 0.3%, Cu 0.15%, W 0.005%, Hf 0.0001%, rare earth (La+Ce) 0.0001%, La: Ce mass ratio is 4 -5:1, B 0.0001%, N 0.001%, the balance is Fe and unavoidable impurity elements, the process route includes: hot metal desulfurization treatment → converter smelting → LF refining → RH refining → continuous casting → rolling → coiling → Heat treatment; the core steps are as follows:

[0051] (1) Desulfurization treatment of molten iron;

[0052] (2) Converter smelting: Select molten iron and scrap steel with S content ≤0.005% and C content ≤0.08%, the mass ratio of molten iron to scrap steel is 9:1, add molten iron first, then add scrap steel, adopt double slag operation, converter bottom blowing Argon and nitrogen, the initial nitrogen intens...

Embodiment 2

[0060] A production method of high-strength and low-inclusion pipeline steel, characterized in that: the composition of pipeline steel is C 0.067%, Si0.15%, Mn 1.76%, P≤0.015%, S≤0.005%, Nb 0.05%, V 0.025% , Ti 0.003%, Al≤0.050%, Cr 0.6%, Mo 0.28%, Ni 0.32%, Cu 0.17%, W 0.007%, Hf 0.0003%, rare earth (La+Ce) 0.0003%, La: Ce mass ratio is 4 -5:1, B 0.0003%, N 0.003%, the balance is Fe and unavoidable impurity elements, the process route includes: hot metal desulfurization treatment → converter smelting → LF refining → RH refining → continuous casting → rolling → coiling → Heat treatment; the core steps are as follows:

[0061] (1) Desulfurization treatment of molten iron;

[0062] (2) Converter smelting: Select molten iron and scrap steel with S content ≤0.005% and C content ≤0.08%, the mass ratio of molten iron to scrap steel is 9:1, add molten iron first, then add scrap steel, adopt double slag operation, converter bottom blowing Argon and nitrogen, the initial nitrogen int...

Embodiment 3

[0070] A production method of high-strength and low-inclusion pipeline steel, characterized in that: pipeline steel components are C 0.07%, Si0.2%, Mn 1.78%, P≤0.015%, S≤0.005%, Nb0.06%, V 0.03 %, Ti 0.005%, Al≤0.050%, Cr 0.65%, Mo 0.3%, Ni 0.35%, Cu 0.19%, W 0.008%, Hf 0.005%, rare earth (La+Ce) 0.0005%, La: Ce mass ratio is 4-5:1, B 0.0005%, N 0.005%, the balance is Fe and unavoidable impurity elements, the process route includes: hot metal desulfurization treatment → converter smelting → LF refining → RH refining → continuous casting → rolling → coiling →Heat treatment; the core steps are as follows:

[0071] (1) Desulfurization treatment of molten iron;

[0072] (2) Converter smelting: Select molten iron and scrap steel with S content ≤0.005% and C content ≤0.08%, the mass ratio of molten iron to scrap steel is 9:1, add molten iron first, then add scrap steel, adopt double slag operation, converter bottom blowing Argon and nitrogen, the initial nitrogen intensity is 0.12...

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Abstract

The invention discloses a production method for high strength low entrainment pipeline steel. The pipeline steel contains minor constituents including C, Si, Mn, P, S, Nb, V, Ti, Al, Cr, Mo, Ni, Cu, W, Hf, rare earth (La+Ce), B, N and the balance of Fe and inevitable impurity elements. Tissues of a reeled steel plate comprise 93-95% of acicular ferrite, 1-2% of polygonal ferrite and 3-5% of martensite based on area rate, and the average grain sizes are 2-5[mu]m; the area ratio of tempered martensite in the thermally treated tissues accounts for 90-95%, and 2-3% of fine ferrite and 5-6% of tempered bainite are included; the yield strength after thermal treatment is 950-1060MPa, the tensile strength is 1080-1250MPa, the impact toughness at 20 DEG C below zero is 220-240J, and the ductility is 17-19%.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a production method of high-strength and low-inclusion pipeline steel. Background technique [0002] Pipeline steel is the medium and thick plate and coil required for the manufacture of oil and natural gas pipelines or coal and building material slurry pipelines. The oil and gas pipeline is the most convenient and safest way to connect the resource area and the use area. Its rapid construction can not only relieve the pressure of road transportation in my country, but also play an important role in ensuring the safe supply of the oil and gas market. The carbon content of pipeline steel is gradually reduced, the alloy elements are diversified, and harmful elements such as sulfur and phosphorus are also controlled at a very low content. In addition to high strength and high toughness, high-grade pipeline steel should also have good crack resistance (sulfide st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/58C22C38/48C22C38/46C22C38/50C22C38/06C22C38/44C22C38/42C22C33/06C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0247C21D2211/008C22C33/06C22C38/002C22C38/005C22C38/02C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 周建武
Owner 温州市赢创新材料技术有限公司
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