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Ultrahigh-strength X100 pipeline steel plate with excellent crack resistance and preparation method thereof

An ultra-high-strength, crack-arresting technology, applied in the field of micro-alloy steel, can solve the problems of less attention on the crack-arrest performance of ultra/high-strength X100 pipeline steel, the precise realization of unfavorable cooling control parameters, and unfavorable plate shape control of final cooling temperature, etc. , to achieve the effects of low welding crack sensitivity index, excellent crack arrest performance and improved cooling process

Active Publication Date: 2014-04-02
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the starting cooling temperature is 770-800°C, and the final cooling temperature is 90-190°C. The temperature difference between the two is large, the final cooling temperature control is low, and the control level of cooling equipment is high, which is not conducive to the accurate realization of cooling control parameters. , thus increasing the instability of the properties of the steel plate
In addition, the lower final cooling temperature is not conducive to plate shape control
[0004] In addition, there are currently existing patents for X100 pipeline steel in China, such as "a high-strength X100 pipeline steel hot-rolled flat plate and its production method" with the publication number CN101619416A, "ultra-high-strength X100 pipeline steel and its rolled plate" with the publication number CN1986861A "Manufacturing method" and other patents tend to focus on the control of economical production technology, super / high strength and other performance indicators, but pay less attention to the crack arrest performance of super / high strength X100 pipeline steel

Method used

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  • Ultrahigh-strength X100 pipeline steel plate with excellent crack resistance and preparation method thereof
  • Ultrahigh-strength X100 pipeline steel plate with excellent crack resistance and preparation method thereof
  • Ultrahigh-strength X100 pipeline steel plate with excellent crack resistance and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The chemical composition of present embodiment steel plate is as follows:

[0038] The chemical composition and weight percentage content (%) of the product are: C: 0.04, Si: 0.25, Mn: 2.0, S: 0.002, P: 0.005, Ni: 0.25, Mo: 0.25, Cr: 0.25, Cu: 0.25, Nb : 0.06, Ti: 0.02, N≤0.004, O≤0.004, H≤0.002, Als: 0.016, Pcm: 0.19%.

[0039] The preparation method of the above-mentioned steel plate is as follows: including molten iron pretreatment, deep dephosphorization of double steelmaking process, LF refining, RH vacuum degassing, slab continuous casting, slab heating, controlled rolling and controlled cooling, and the size of the continuous casting slab: 250mm ×1800mm×3610mm, steel plate size: 20mm×2000mm×38000mm, of which:

[0040] (1) Hot metal pretreatment: After pretreatment, the S content in the hot metal is 0.001 (weight) %, and the temperature is 1220 ° C;

[0041] (2) Deep dephosphorization in duplex steelmaking process: the temperature of molten iron is 1420°C, the a...

Embodiment 2

[0050] The chemical composition of present embodiment steel plate is as follows:

[0051] The chemical composition and weight percentage content (%) of the product are: C: 0.04, Si: 0.25, Mn: 2.0, S: 0.002, P: 0.005, Ni: 0.25, Mo: 0.25, Cr: 0.25, Cu: 0.25, Nb : 0.06, Ti: 0.02, N≤0.004, O≤0.004, H≤0.002, Als: 0.016, Pcm: 0.19%.

[0052] The preparation method of the above-mentioned steel plate is as follows: including molten iron pretreatment, deep dephosphorization of double steelmaking process, LF refining, RH refining, slab continuous casting, slab heating, controlled rolling and controlled cooling, the size of the continuous casting slab is: 250mm×1800mm ×3610mm, steel plate size: 20mm×2000mm×38000mm, of which:

[0053] The molten iron pretreatment, deep dephosphorization of duplex steelmaking process, LF refining, RH vacuum degassing process, slab continuous casting, slab heating temperature, and austenite recrystallization rolling process are the same as those in Example...

Embodiment 3

[0056] The chemical composition of present embodiment steel plate is as follows:

[0057] The chemical composition and weight percentage content (%) of the product are: C: 0.04, Si: 0.25, Mn: 2.0, S: 0.002, P: 0.005, Ni: 0.25, Mo: 0.25, Cr: 0.25, Cu: 0.25, Nb : 0.06, Ti: 0.02, N≤0.004, O≤0.004, H≤0.002, Als: 0.016, Pcm: 0.19%.

[0058] The preparation method of the above-mentioned steel plate is as follows: including molten iron pretreatment, deep dephosphorization of double steelmaking process, LF refining, RH refining, slab continuous casting, slab heating, controlled rolling and controlled cooling, the size of the continuous casting slab is: 250mm×1800mm ×3610mm, steel plate size: 20mm×2000mm×38000mm, of which:

[0059] The molten iron pretreatment, deep dephosphorization of duplex steelmaking process, LF refining, RH vacuum degassing process, slab continuous casting, slab heating temperature, and austenite recrystallization rolling process are the same as those in Example...

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Abstract

The invention discloses an ultrahigh-strength X100 pipeline steel plate with excellent crack resistance. The steel plate comprises the following chemical components: 0.03-0.06% of C, 0.20-0.50% of Si, 1.80-2.10% of Mn, no more than 0.005% of S, no more than 0.010% of P, 0.20-0.50% of Ni, 0.20-0.40% of Mo, 0.20-0.50% of Cr, 0.20-0.50% of Cu, 0.050-0.080% of Nb, 0.015-0.035% of Ti, no more than 0.004% of N, no more than 0.004% of O, no more than 0.002% of H, no less than 0.015% of Als and the balance of Fe and trace impurities; Pcm is no more than 0.25%. The invention also discloses a preparation method of the steel plate. A shock crack of a V-shaped gap of the steel plate can exceed 55J, the shock crack can expand over 160J, and the crack resistance is good.

Description

technical field [0001] The invention relates to a pipeline steel and a manufacturing method thereof, in particular to an ultra-high-strength X100 pipeline steel plate with excellent crack arrest performance and a preparation method thereof, belonging to the field of microalloy steel. Background technique [0002] In order to reduce the construction cost of oil and gas pipelines, increase the transmission pressure, and improve the efficiency of oil and gas transmission, the research and use of high-grade pipeline steel with good crack arrest performance, high strength, large deformation resistance and good on-site welding performance has become the development of pipeline steel. trend. The traditional X70 and X80 grade pipeline steels have little difference in composition design and strength level, and the cost reduction is limited, while the use of X100 or higher grade pipeline steel will significantly reduce pipeline construction and operation costs. At present, as X80 gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C33/04C21D8/02
Inventor 霍孝新周平黄少文吴会亮汤化胜张长宏吴德发
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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