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900MPa-level ultrahigh-tenacity high-toughness pipeline steel plate and manufacturing method thereof

A high-toughness, ultra-high-strength technology, applied in the field of 900MPa high-toughness pipeline steel plate and its manufacturing, can solve the problems of high alloy cost and complicated production process, and achieve the effect of reducing production cost and improving production efficiency

Inactive Publication Date: 2015-05-20
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

[0007] The purpose of the present invention is to overcome the shortage of high-grade pipeline steel strength in the prior art, which cannot meet the needs of future high-pressure pipelines, high alloy costs, and production processes. Complicated and other deficiencies, to provide a 900MPa ultra-high-strength high-toughness pipeline steel plate suitable for the construction of the main line of ultra-high pressure long-distance pipelines in the future and its manufacturing method. Reach: RP0.2≥900MPa, Rm≥1050MPa, RP0.2 / Rm≤ 0.90, Elongation (A50mm)≥12%, -20℃ KV2≥200J, -15℃ DWTT SA≥85%

Method used

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  • 900MPa-level ultrahigh-tenacity high-toughness pipeline steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A 900MPa-grade ultra-high-strength and high-toughness pipeline steel plate, its chemical composition and weight percentage are: C: 0.035%, Si: 0.21%, Mn: 2.41%, P: 0.012%, S: 0.0014%, Nb: 0.055%, Ti: 0.019%, Cu: 0.14%, Cr: 0.47%, Ni: 0.37%, Mo: 0.32%, Al: 0.043%, B: 0.0028%, N: 0.0073%, and the balance is Fe and unavoidable inclusions.

[0040] Production process steps:

[0041] 1) Smelting and continuous casting into billets;

[0042] 2) Heating the billet to 1052°C;

[0043] 3) Rough rolling is carried out after the steel billet comes out of the furnace, the rolling start temperature is 1031°C, the reduction rate of each rough rolling pass is ≥10%, and the rough rolling end temperature is 980°C;

[0044] 4) After the rough rolling is finished, wait until the temperature reaches 920°C to start finish rolling, the finishing temperature is 846°C, and the cumulative rolling reduction rate of finish rolling is 80%;

[0045] 5) Immediately after the finish rolling of the...

Embodiment 2

[0048] A 900MPa-grade ultra-high-strength and high-toughness pipeline steel plate, its chemical composition and weight percentage are: C: 0.042%, Si: 0.39%, Mn: 2.50%, P: 0.011%, S: 0.0010%, Nb: 0.051%, Ti: 0.025%, Cu: 0.30%, Cr: 0.35%, Ni: 0.42%, Mo: 0.18%, Al: 0.049%, B: 0.0030%, N: 0.0066%, and the balance is Fe and unavoidable inclusions.

[0049] Production process steps:

[0050] 1), smelting and continuous casting into billets;

[0051] 2), heating the billet to 1105°C;

[0052] 3) Rough rolling is carried out after the steel billet comes out of the furnace, the rolling start temperature is 1084°C, the reduction rate of each pass of rough rolling is not less than 10%, and the rough rolling end temperature is 1066°C;

[0053] 4) After the rough rolling is finished, wait until the temperature reaches 900°C to start finish rolling, the finishing temperature is 826°C, and the cumulative rolling reduction rate of finish rolling is 79.1%;

[0054] 5) Immediately after the ...

Embodiment 3

[0057] A 900MPa-grade ultra-high-strength and high-toughness pipeline steel plate, its chemical composition and weight percentage are: C: 0.048%, Si: 0.34%, Mn: 2.32%, P: 0.010%, S: 0.0011%, Nb: 0.047%, Ti: 0.015%, Cu: 0%, Cr: 0.60%, Ni: 0.32%, Mo: 0.36%, Al: 0.032%, B: 0.0026%, N: 0.0060%, and the balance is Fe and unavoidable inclusions.

[0058] Production process steps:

[0059] 1) Smelting and continuous casting into billets;

[0060] 2) Heating the billet to 1120°C;

[0061] 3) Rough rolling is carried out after the steel billet comes out of the furnace. The starting temperature of the rolling is 1090°C, the reduction rate of each rough rolling pass is not less than 10%, and the finishing temperature of the rough rolling is 1078°C;

[0062] 4) After the rough rolling is finished, wait until the temperature reaches 890°C to start finish rolling, the finishing temperature is 804°C, and the cumulative reduction rate of finish rolling is 80%;

[0063] 5) Immediately after...

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Abstract

The invention relates to a 900MPa-level ultrahigh-tenacity high-toughness pipeline steel plate. The 900MPa-level ultrahigh-tenacity high-toughness pipeline steel plate comprises the following chemical compositions in percentage by weight: 0.035%-0.065% of C, 0.15-%-0.40% of Si, 1.90%-2.50% of Mn, less than or equal to 0.012% of P, less than or equal to 0.0015% of S, 0.030%-0.055% of Nb, 0.010%-0.25% of Ti, 0-0.30% of Cu, 0.35%-0.60% of Cr, 0.10%-0.50% of Ni, 0-0.50% of Mo, 0.020%-0.050% of Al, 0.0010%-0.0030% of B, less than or equal to 0.0080% of N. The preparation method comprises the steps of: smelting and continuously casting into blanks; heating casting blanks; roughly rolling; finely rolling; fast cooling; straightening after stopping for 40-60S. By adding B and Cr elements and reducing the content of Nb, Mo and Ni, the production cost of the ultrahigh-tenacity X80 pipeline steel can be obviously lowered, and the efficiency can be improved; a metallographic structure is bainite plus less M-A structure, the main mechanical properties are as follows: more than or equal to 900MPa of RP0.2, more than or equal to 1050MPa of Rm, less than or equal to 0.90 of RP0.2 / Rm, more than equal to 12% of elongation (A50mm), more than or equal to 200J of minus 20degree CKV2, and more than or equal to 5% of minus 15 degree CDWTTSA.

Description

technical field [0001] The invention relates to the field of micro-alloyed steel manufacturing, specifically to provide a 900MPa grade high-toughness pipeline steel plate and a manufacturing method thereof in order to meet the demand for ultra-high-strength and high-toughness pipeline steel plates for main lines of high-pressure long-distance pipelines at home and abroad. 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, the transmission pressure and pipe diameter of pipelines have been increasing in recent years. In order to ensure the safety of high-pressure long-distance pipeline operation, the strength and fracture toughness of pipeline steel materials used The req...

Claims

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Application Information

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