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Thick-specification pipeline steel cooling method

A cooling method and thick-gauge technology, which is applied in the field of heat treatment, can solve the problems of no obvious requirements for cooling speed and the reduction of toughness of thick-gauge pipeline steel, so as to avoid abnormal structures such as bainite/martensite and reduce the temperature gradient Affects, effects that improve accuracy

Inactive Publication Date: 2015-06-10
攀钢集团西昌钢钒有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously, the above method still adopts the conventional cooling method, and there is no obvious requirement on the cooling rate. When the thick-gauge pipeline steel is cooled, there is a temperature gradient in the thickness direction, and the edge part of the cooling too fast is prone to bainite / martensite, etc. Abnormal structure, leading to a sharp decrease in the toughness of thick gauge pipeline steel
[0006] To sum up, the existing thick-gauge pipeline steel cooling method, when cooling the thick-gauge pipeline steel, there is a temperature gradient in the thickness direction, and the area where the cooling is too fast is prone to abnormal structures such as bainite / martensite, Lead to a sharp decrease in the toughness of thick-gauge pipeline steel

Method used

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Effect test

Embodiment 1

[0041] X80 grade thick specification pipeline steel, the specification is 18.4×1500mm (thickness×width), after finish rolling, it is rapidly cooled to 450℃ at a cooling rate of 10℃ / s, then air-cooled for 8s, and then laminar flow cooled to 400 ℃ coiled, its mechanical property is Rt 0.5 :572,R m : 636,A 50 : 44.0, -20°C Akv: 323, -15°C DWTT shear area SA%: 92.7.

Embodiment 2

[0047] X80 grade thick specification pipeline steel, the specification is 18.4×1500mm (thickness×width), after finish rolling, it is rapidly cooled to 620℃ at a cooling rate of 29℃ / s, then air-cooled for 17s, and then laminar flow cooled to 560 ℃ coiled, its mechanical property is Rt 0.5 :561,R m : 644,A 50 : 42.5, -20°C Akv: 362, -15°C DWTT shear area SA%: 91.3.

Embodiment 3

[0053] X80 grade thick specification pipeline steel, the specification is 18.4×1500mm (thickness×width), after finish rolling, it is rapidly cooled to 520℃ at a cooling rate of 21℃ / s, then air-cooled for 13s, and then laminar flow cooled to 460℃ ℃ coiled, its mechanical property is Rt 0.5 : 553MPa, R m : 682MPa, A 50 : 43.5%, -20°C Akv: 332J, -15°C DWTT shear area SA%: 98.7%.

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Abstract

The invention discloses a thick-specification pipeline steel cooling method which is mainly used for cooling thick-specification pipeline steel with the thickness of more than 12.0mm subjected to heating, dephosphorization, rough rolling, head / tail flying shear cutting, dephosphorization and finish rolling. The method comprises the following steps: quick cooling, air cooling and laminar cooling. The method can further integrally enhance the toughness of the thick-specification pipeline steel.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a method for cooling thick gauge pipeline steel. Background technique [0002] Acicular ferritic pipeline steel mainly refers to Mn-Nb-Mo(Ti) series high-strength pipeline steel with a carbon content of less than 0.1%. The range of strength grades can cover X60-X90, and it is developing towards low-carbon and ultra-low-carbon , and its organizational state is usually acicular ferrite + a small amount of (quasi) polygonal ferrite + very small amount of pearlite + M / A components. Acicular ferritic pipeline steel has excellent toughness, weldability, hydrogen sulfide resistance and low Bauschinger effect. The biggest feature of the rolling production process of acicular ferritic pipeline steel is that the cooling rate is relatively high. [0003] At present, there are two methods of cooling pipeline steel, intermittent accelerated cooling and continuous accelerated cooling....

Claims

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Application Information

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IPC IPC(8): C21D8/02C21D9/46
Inventor 叶晓瑜张开华李卫平周伟熊学刚王羿龚慧王登刚
Owner 攀钢集团西昌钢钒有限公司
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