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Method for improving pipeline steel drop-weight performance

A pipeline steel and performance technology, applied in the field of hot-rolled steel, can solve the problems of high application and production costs, and achieve the effects of strong operability, improved drop hammer performance, and simple production process

Active Publication Date: 2014-10-22
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the above method cannot be applied to low-grade steel such as X42 pipeline steel, X52 pipeline steel, X60 pipeline steel
[0007] CN103388110A In a method for improving the drop hammer performance of thicker specification X60 pipeline steel, the control of chemical composition is C≤0.12, Si≤0.40, Mn≤1.60, P≤0.025 and S≤0.015, and the following conditions are met: (1) also Added with Nb, V, Ti or their combination, the sum of Nb, V and Ti content ≤ 0.15%; (2) Also added with Cr, Mo, Ni and Cu or their combination, (3)∑ The value of Mn must be between 1.80 and 2.05. This invention is mainly realized by adjusting the chemical composition of X60 pipeline steel, and its production cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The 10mm thick X52 pipeline steel adopts the Nb microalloying process route. After smelting, hot metal pretreatment, LF furnace refining, and continuous casting, the steel billet is obtained. The billet heating temperature is 1195°C. The rough rolling adopts 5 passes, and the deformation amount of each pass More than 20%, the accumulated deformation of rough rolling is 75.6%. The thickness of the intermediate billet is 56mm, the entrance temperature of finish rolling is 990°C, and the temperature of finish rolling is 835°C. After finish rolling, cool to 630°C at a cooling rate of 35°C / s, air cool for 4s, and then cool to 600°C at a cooling rate of 12°C / s for coiling.

[0036] After testing, the mechanical properties of X52 pipeline steel produced in this embodiment are: Rt0.5: 424MPa, Rm: 541MPa, A50: 44%, impact value of 10×7.5×55mm size is 185J, drop weight shear area is 97% and 98%.

Embodiment 2

[0038] The 9.7mm thick X42 pipeline steel adopts the C-Mn steel composition system. After smelting, hot metal pretreatment, LF furnace refining, and continuous casting, the steel billet is obtained. The billet heating temperature is 1185°C. Rough rolling adopts 5 passes, and each pass deforms Amount of more than 20%, rough rolling cumulative deformation of 72.5%. The thickness of the intermediate slab is 55mm, the entrance temperature of finish rolling is 998°C, and the temperature of finish rolling is 842°C. After finish rolling, cool to 627°C at a cooling rate of 36°C / s, air-cool for 4s, and then cool to 600°C at a cooling rate of 12°C / s for coiling.

[0039] After testing, the mechanical properties of the X42 pipeline steel produced in this example are: Rt0.5: 377MPa, Rm: 465MPa, A50: 48%, the impact value of 10×7.5×55mm size is 193J, and the drop hammer shear area is 96% and 96%.

Embodiment 3

[0041] The 13.7mm thick X52 pipeline steel adopts the Nb micro-alloying process route. After smelting, hot metal pretreatment, LF furnace refining, and continuous casting, the steel billet is obtained. The billet heating temperature is 1205°C. The rough rolling adopts 5 passes, and each pass deforms The amount is more than 20%, and the cumulative deformation of rough rolling is 76.4%. The thickness of the intermediate billet is 59mm, the entrance temperature of finish rolling is 976°C, and the temperature of finish rolling is 825°C. After finish rolling, cool to 624°C at a cooling rate of 28°C / s, air cool for 6s, and then cool to 592°C at a cooling rate of 8°C / s for coiling.

[0042] After testing, the mechanical properties of the X52 pipeline steel produced in this example are: Rt0.5: 437MPa, Rm: 558MPa, A50: 41%, the impact value of 10×10×55mm size is 237J, and the drop hammer shear area is 93% and 94%.

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Abstract

The invention relates to a method for improving pipeline steel drop-weight performance, and belongs to the field of hot rolled steel, solving the technical problem that the method for improving pipeline steel drop-weight performance is provided. The method for improving pipeline steel drop-weight performance comprises the following steps of a steel billet heating step, a rolling step and a rolling step, wherein the steps are specifically as follows: a, steel billet heating: heating the steel billets to 1160-1220 DEG C; b, rolling: carrying out rough rolling on the heated steel billets to obtain intermediate billets, and then carrying out finish rolling on the intermediate billets, wherein deformation at every turn in the rough rolling step is not less than 20%, an inlet temperature in the finish rolling step is 960-1000 DEG C, and a final-rolling temperature is AR<3+>(0-50) DEG C; c, coiling: coiling at 580-630 DEG C. According to the method, on the premise that the original pipeline steel components are not changed, the structure homogeneity of the whole fracture surface is improved by an optimizing process, so that drop-weight performance is improved, and therefore, the method is applicable to low-grade pipeline steel, and can improve problems such as poor homogeneity of a ferrite and pearlite type structure.

Description

technical field [0001] The invention relates to a method for improving the drop hammer performance of pipeline steel, which belongs to the field of hot-rolled steel. Background technique [0002] Pipeline steel is mainly used for the transportation of fluid substances such as crude oil, refined oil, natural gas and coal-water slurry. In the international average energy consumption structure, natural gas accounts for 23% of total energy consumption, while my country's current natural gas consumption only accounts for 2.1% of total energy; among the five transportation modes of railway, highway, aviation, water transportation and pipeline, pipeline transportation is a An economical, safe and uninterrupted mode of transportation. In the United States, pipeline transport logistics accounts for about 16% of the total transportation volume, while in my country it only accounts for 3-4%. In the world, materials transported through pipelines account for 20% of the total transportati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02
Inventor 张开华叶晓瑜李卫平周伟熊学刚王羿龚慧
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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