X80 pipeline steel plate with low yield ratio and high toughness and manufacturing method thereof

A technology with low yield ratio and high toughness, applied in the field of X80 pipeline steel plate and its manufacturing, can solve the problems of low yield ratio, uneven performance, low production efficiency, etc., achieve high toughness, low yield ratio, and improve production efficiency and product quality stability

Active Publication Date: 2013-09-04
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

[0005] The purpose of the present invention is to overcome the high steel grade X80 pipeline steel yield ratio (R t0.5 / R m ) high, low production efficiency, plate thickness and longitudinal / transverse structure, uneven performance, unstable product quality, etc., to provide a low yield ratio high toughness X80 pipeline steel plate and its manufacturing method, through the chemical composition and production process Proper adjustment of the high steel grade X80 pipeline steel has high strength, low yield ratio, excellent welding performance and a good match of microstructure and performance uniformity

Method used

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  • X80 pipeline steel plate with low yield ratio and high toughness and manufacturing method thereof
  • X80 pipeline steel plate with low yield ratio and high toughness and manufacturing method thereof
  • X80 pipeline steel plate with low yield ratio and high toughness and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A low yield ratio high toughness X80 pipeline steel plate, its chemical composition and weight percentage are: C: 0.036%, Si: 0.28%, Mn: 1.89%, P: 0.010%, S: 0.0011%, Ni: 0.20%, Mo: 0.18%, Cr: 0.34%, Cu: 0.16%, Nb: 0.048%, Ti: 0.016%, Al: 0.048%, N: 0.0066%, and the balance is Fe and unavoidable inclusions.

[0041] Production process steps:

[0042] 1) Smelting and continuous casting into billets;

[0043] 2) Heating the billet, controlling the heating temperature at 1100-1105°C; and descaling with high-pressure water;

[0044] 3) Using TMCP process:

[0045] a. Rough rolling: the starting temperature is 1062°C, the reduction rate of each pass of rough rolling is ≥10%, the end temperature of rough rolling is 1030°C, and the cumulative rough rolling reduction rate is 60%;

[0046] b. Carry out finish rolling, the start rolling temperature is 890°C, the finish temperature is 823°C, the cumulative reduction rate of finish rolling is 80%; the thickness of the steel plat...

Embodiment 2

[0052] A low yield ratio high toughness X80 pipeline steel plate, its chemical composition and weight percentage are: C: 0.041%, Si: 0.22%, Mn: 1.83%, P: 0.012%, S: 0.0013%, Ni: 0.15%, Mo: 0.13%, Cr: 0.50%, Cu: 0.24%, Nb: 0.055%, Ti: 0.022%, Al: 0.021%, N: 0.0073%, and the balance is Fe and unavoidable inclusions.

[0053] Production process steps:

[0054] 1) Smelting and continuous casting into billets;

[0055] 2) Heating the billet, controlling the heating temperature at 1100-1105°C; and descaling with high-pressure water;

[0056] 3) Using TMCP process:

[0057] a. Rough rolling: the starting temperature is 1062°C, the reduction rate of each rough rolling pass is not less than 10%, the rough rolling end temperature is 1030°C, and the rough rolling cumulative reduction rate is 60%;

[0058] b. Carry out finish rolling, the start rolling temperature is 890°C, the finish temperature is 823°C, the cumulative reduction rate of finish rolling is 80%; the thickness of the ste...

Embodiment 3

[0064] A low yield ratio high toughness X80 pipeline steel plate, its chemical composition and weight percentage are: C: 0.047%, Si: 0.38%, Mn: 1.74%, P: 0.009%, S: 0.0010%, Ni: 0.40%, Mo: 0.10%, Cr: 0.30%, Cu: 0.19%, Nb: 0.042%, Ti: 0.011%, Al: 0.028%, N: 0.0057%, and the balance is Fe and unavoidable inclusions.

[0065] Production process steps:

[0066] 1) Smelting and continuous casting into billets;

[0067] 2) Heating the billet, controlling the heating temperature at 1120-1125°C; and descaling with high-pressure water;

[0068] 3) Using TMCP process:

[0069] a. Rough rolling: the starting temperature is 1088°C, the reduction rate of each pass of rough rolling is not less than 10%, the finishing temperature of rough rolling is 1066°C, and the cumulative reduction rate of rough rolling is 68%;

[0070] b. Carry out finish rolling, the start rolling temperature is 930°C, the finish temperature is 843°C, the cumulative reduction rate of finish rolling is 78.1%; the thi...

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Abstract

The invention relates to an X80 pipeline steel plate with low yield ratio and high toughness. The X80 pipeline steel plate contains the following chemical ingredients in percentage by weight: 0.036-0.060% of C, 0.15-0.40% of Si, 1.65-1.90% of Mn, not higher than 0.012% of P, not higher than 0.0015% of S, 0.15-0.40% of Ni, 0.10-0.30% of Mo, 0.30-0.50% of Cr, 0-0.30% of Cu, 0.035-0.055% of Nb, 0.005-0.030% of Ti, 0.020-0.050% of Al and not higher than 0.008% of N. A method for manufacturing the X80 pipeline steel plate comprises the steps of: smelting and continuously casting into blanks; heating the cast blanks; adopting a TMCP (Thermo-Mechanical Control Process); and carrying out quenching and tempering treatment. According to the X80 pipeline steel plate and the method, the temperature and structural homogeneity of a thick-specification pipeline steel plate in thick, longitudinal and transverse directions can be increased remarkably while the high strength, high toughness and low yield ratio of high-grade X80 pipeline steel are realized; and the X80 pipeline steel plate has the advantages that the yield strength (Rt0.5) is not lower than 555 MPa, the tensile strength (Rm) is not lower than 625 MPa, the yield ratio (Rt0.5 / Rm) is not greater than 0.82, the elongation percentage (A50mm) is not lower than 30%, the KV2 at the temperature of -40 DEG C is not lower than 240 J, the DWTTSA at the temperature of -30 DEG C is not lower than 85%, the co-plate strength difference of the steel plate is not higher than 30 MPa.

Description

technical field [0001] The invention relates to the field of microalloyed steel manufacturing, specifically to provide a low yield ratio, high toughness, and high homogeneity to meet the demand for steel used in the construction of major long-distance pipeline projects at home and abroad in the second and third types of areas. High-strength X80 pipeline steel plate and its manufacturing method. Background technique [0002] With the rapid development of the world economy, the demand for energy resources such as oil and natural gas is increasing day by day, and the construction of long-distance oil and natural gas pipelines has been vigorously developed. In order to improve the transmission efficiency and operation economy of long-distance pipelines, in recent years, the transmission pressure and diameter of pipelines have been increasing continuously, and they have gradually extended to areas with harsh environments such as earthquakes, landslides, polar regions, and seabeds...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C21D8/02
Inventor 徐进桥郭斌孔君华郑琳李利巍崔雷邹航
Owner 武汉钢铁有限公司
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