Anti-large deformation steel for X80 pipeline and production method hereof

A pipeline steel and anti-large deformation technology, which is applied in the field of pipeline steel, can solve the problems of insufficient denaturation ability, time-consuming quenching and tempering heat treatment process, and inability to bear the load, so as to improve low-temperature toughness and structure, and shorten the waiting temperature for rolling. Time, the effect of reducing the cost of the alloy

Active Publication Date: 2013-05-15
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The Chinese patent application number is 200910187466.6, which discloses "a hot-rolled X80 pipeline steel coil and its manufacturing method"; and the Chinese patent number is 200410025584.4, which discloses a "high-strength and high-toughness X80 pipeline Steel and its hot-rolled plate manufacturing method", the above-mentioned documents have high yield ratio, low uniform elongation, insufficient denaturation ability, and cannot bear the large strain induced by ground displacement in harsh environments such as earthquakes, landslides, and polar tundra
The disa

Method used

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  • Anti-large deformation steel for X80 pipeline and production method hereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A large deformation resistant X80 pipeline steel, its composition and weight percentage content are: C: 0.051, Si: 0.26, Mn: 1.89, P: 0.010, S: 0.0010, Ni: 0.01, Mo: 0.34, Cr: 0.26, Cu: 0.02, Nb: 0.056, V: 0.003%, Ti: 0.026%, Al: 0.032, N: 0.0090, Ca: 0.0021, the balance is Fe and inevitable inclusions.

[0039] Production steps:

[0040] 1) Smelting and continuous casting into billets;

[0041] 2) Heating the slab, the temperature is controlled at 1126℃;

[0042] 3) Carry out rough rolling, the end temperature of rough rolling is 973℃, and the reduction rate per pass is 12%;

[0043] 4) For finishing rolling, the start rolling temperature is 885°C, the final rolling temperature is 817°C, and the cumulative reduction ratio is 78.3%;

[0044] 5) Cooling in two stages: the first stage of cooling is cooled to 749°C at a cooling rate of 5.6°C / S, and the second stage of cooling is cooled to 303°C at a cooling rate of 35.3°C / S;

[0045] 6) Straighten after cooling to room temperature in...

Embodiment 2

[0047] A large deformation resistant X80 pipeline steel, its composition and weight percentage content are: C: 0.084, Si: 0.20, Mn: 1.78, P: 0.008, S: 0.0005, Ni: 0.16, Mo: 0.17, Cr: 0.34, Cu: 0.05, Nb: 0.045, V: 0.004%, Ti: 0.013%, Al: 0.022, N: 0.0085, Ca: 0.0012, the balance is Fe and inevitable inclusions.

[0048] Production steps:

[0049] 1) Smelting and continuous casting into billets;

[0050] 2) Heating the slab, the temperature is controlled at 1139℃;

[0051] 3) Carry out rough rolling, the end temperature of rough rolling is 1049℃, and the reduction rate per pass is 13%;

[0052] 4) For finishing rolling, the start rolling temperature is 879°C, the final rolling temperature is 806°C, and the cumulative reduction ratio is 81%;

[0053] 5) Cooling is performed in two stages: the first stage of cooling is cooled to 722°C at a cooling rate of 6.2°C / S, and the second stage of cooling is cooled to 252°C at a cooling rate of 41.4°C / S;

[0054] 6) Straighten after cooling to room te...

Embodiment 3

[0056] A large-deformation resistant X80 pipeline steel, its composition and weight percentage content are: C: 0.059, Si: 0.43, Mn: 1.80, P: 0.007, S: 0.0014, Ni: 0.10, Mo: 0.27, Cr: 0.39, Cu: 0.07, Nb: 0.061, V: 0.002%, Ti: 0.018%, Al: 0.039, N: 0.0077, Ca: 0.0036, the balance is Fe and unavoidable inclusions.

[0057] Production steps:

[0058] 1) Smelting and continuous casting into billets;

[0059] 2) Heating the slab, the temperature is controlled at 1103℃;

[0060] 3) Carry out rough rolling, the end temperature of rough rolling is 1027℃, and the reduction rate per pass is 15.5%;

[0061] 4) For finishing rolling, the start-rolling temperature is 863℃, the final rolling temperature is 795℃, and the cumulative reduction ratio is 75.2%;

[0062] 5) Cooling in two stages: the first stage of cooling is cooled to 743°C at a cooling rate of 6.9°C / S, and the second stage of cooling is cooled to 291°C at a cooling rate of 52.4°C / S;

[0063] 6) Straighten after cooling to room temperature ...

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Abstract

The invention discloses anti-large deformation steel for an X80 pipeline which consists of the following components in percentage by weight: 0.050-0.085% of C, 0.20-0.45% of Si, 1.75-1.90% of Mn, less than or equal to 0.012% of P, less than or equal to 0.0015% of S, 0.15-0.35% of Mo, 0.25-0.50% of Cr, less than or equal to 0.03% of Cu, 0.045-0.080% of Nb, less than or equal to 0.01% of V, 0.005-0.030% of Ti, 0.02-0.05% of Al, less than or equal to 0.010% of N and 0.0010-0.0050% of Ca. The production steps of the anti-large deformation steel comprises smelting and continuous casting into blank, cast blank heating, rough rolling, finish rolling, two-section cooling and air cooling to room temperature and straightening. According to the invention, the uniform elongation A, the stress ratio and the deformability of steel are obviously improved through accurate duplex structure control; and by adopting low-temperature heating and two-section cooling, relaxation after rolling is canceled, the rolling holding time is shortened, the low-temperature toughness and structure of the pipeline steel are improved, and the performance is stable.

Description

Technical field [0001] The invention relates to pipeline steel and a production method thereof, and specifically belongs to a large-deformation resistant X80 pipeline steel and a production method thereof. It is precisely to meet the requirements of major long-distance pipeline projects at home and abroad in earthquakes, landslides, and polar frozen soil zones. The demand for high-grade large-deformation pipeline steel in harsh areas provides a strain-based X80 pipeline steel and its manufacturing method. Background technique [0002] With the gradual depletion of terrestrial oil and gas resources, the exploitation of new resources extends to areas with harsh geological conditions such as earthquakes, landslide zones, seabeds, and polar tundra. Long-distance pipelines passing through such areas are affected by the environment of use and need to withstand large strains induced by ground displacements such as earthquakes, landslides, frozen soil thawing, etc. The pipelines laid in ...

Claims

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Application Information

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IPC IPC(8): C22C38/38C21D8/10
Inventor 徐进桥郭斌李银华郑琳熊玉彰彭涛杨波黄道昌崔雷邹航
Owner 武汉钢铁有限公司
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