X 60 pipeline steel with thickness of 16-25 mm and production method of pipeline steel

A production method and pipeline steel technology, which is applied in the field of pipeline steel production, can solve the problems of general material deformation ability, small shaping range, and few adopters, so as to reduce the Bauschinger effect, improve the purity of molten steel, and reduce the Bauschinger effect. low grid effect

Inactive Publication Date: 2014-01-22
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this study, "low temperature, high reduction" rolling was adopted. Due to the influence of chemical composition design and controlled rolling and controlled cooling process, the microstructure was only ferrite plus a small amount of pearlite. Ferritic pearlite steel is difficult To achieve high-level strength and meet the impact toughness requirements at low temperature, the yield ratio is 0.82 to 0.85, which is close to the maximum value of 0.85 generally required, which fails

Method used

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  • X 60 pipeline steel with thickness of 16-25 mm and production method of pipeline steel
  • X 60 pipeline steel with thickness of 16-25 mm and production method of pipeline steel
  • X 60 pipeline steel with thickness of 16-25 mm and production method of pipeline steel

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Embodiment 1

[0029] In this embodiment, the production of 16mm thick X60 pipeline steel is taken as an example, and the above-mentioned specific production method is adopted for production. The rolling temperature is 950°C; the final rolling temperature in the first stage is 975°C, the starting rolling temperature in the second stage is 880°C, and the second stage adopts small reduction rolling to ensure the original plate shape, and the final rolling temperature is 800°C; the steel plate is rolled into ACC for Rapid cooling, the water inlet temperature is 760°C, the red return temperature is 480°C, and the cooling rate is controlled at 16°C / s.

Embodiment 2

[0031] In this embodiment, the production of 20mm thick X60 pipeline steel is taken as an example, and the above-mentioned specific production method is adopted for production. The rolling temperature is 1100°C; the final rolling temperature in the first stage is 975°C, the starting rolling temperature in the second stage is 900°C, the second stage adopts rolling under small reduction to ensure the original plate shape, and the final rolling temperature is 830°C; the steel plate is rolled into ACC for Rapid cooling, the water inlet temperature is 775°C, the redness temperature is 490°C, and the cooling rate is controlled at 17°C / s.

Embodiment 3

[0033] In this embodiment, the production of 25mm thick X60 pipeline steel is taken as an example, and the above-mentioned specific production method is adopted for production. The rolling temperature is 1150°C; the final rolling temperature in the first stage is 1000°C, the starting rolling temperature in the second stage is 920°C, and the second stage is rolled under a small reduction to ensure the original plate shape, and the final rolling temperature is 860°C; the steel plate is rolled into ACC for Rapid cooling, the water inlet temperature is 790°C, the red return temperature is 520°C, and the cooling rate is controlled at 18°C / s.

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Abstract

The invention discloses X 60 pipeline steel with the thickness of 16-25 mm and a production method of the pipeline steel. The pipeline steel comprises chemical components as follows: 0.06 wt%-0.09 wt% of C, 0.25 wt%-0.35 wt% of Si, 1.55 wt%-1.69 wt% of Mn, 0.20 wt%-0.29 wt% of (Nb+Ti+V+Mo+Ni), no more than 0.010 wt% of P and no more than 0.003 wt% of S. The production method mainly comprises LF+VD, continuous casting and controlled rolling and controlled cooling. Obtained X 60 microstructure contains 42 %-46 % of lath-shaped ferrites, 32 %-38 % of acicular ferrites, 13 %-15 % of bainite, a small amount of M-A islands and fine dispersion precipitated phases; the phase interface bonding performance is good, the yield ratio is 0.66-0.76, and the grain size reaches 11.5-12.5 grades; and the welding performance is good, and the Bauschinger effect is low.

Description

technical field [0001] The invention belongs to the technical field of pipeline steel production, and in particular relates to a 16-25mm thick X60 pipeline steel and a production method thereof. Background technique [0002] In recent years, with the further development of energy sources such as oil and natural gas, the development and production of pipeline steel have been rapidly developed. In order to improve transmission efficiency and reduce energy consumption, pipeline steel has been continuously developing into high-grade pipelines with high strength, high toughness and excellent welding performance. Steel development, and at the present stage, X60 grade pipeline steel occupies a huge market share. [0003] High-strength pipeline steel obtains properties such as high yield strength and high toughness through composition design, ultra-fine purification, controlled rolling and controlled cooling and other modern metallurgical and rolling technologies. The composition de...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C38/12C22C38/08C22C33/04C21D8/10
Inventor 朱书成于飒许少普唐郑磊崔冠军赵迪康文举
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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