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Rolling method for controlling Nb-Ti composite precipitate in pipeline steel

A technology for precipitates and pipeline steel, which is applied in metal rolling, metal rolling, rolling mill control devices, etc. Precipitation rules and other issues to achieve the effect of refining grains and improving toughness and toughness

Inactive Publication Date: 2019-02-05
XIJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The document "Composite Precipitation Behavior of Nb and Ti Carbonitrides in X100 Pipeline Steel" (Journal of Materials Heat Treatment) introduced the existence of NbC and TiN composite precipitates observed in the analysis of precipitates in X100 pipeline steel, but did not introduce NbC-TiN The control process and precipitation behavior of composite precipitates; similarly, the document "Nano-precipitation Law in Nb-Ti Microalloyed X100 Pipeline Steel" (Journal of Materials Heat Treatment) introduced the precipitation morphology containing Nb and Ti elements, and found that NbC- TiN composite precipitates, but the literature does not involve the control process and precipitation rules of NbC-TiN

Method used

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  • Rolling method for controlling Nb-Ti composite precipitate in pipeline steel
  • Rolling method for controlling Nb-Ti composite precipitate in pipeline steel
  • Rolling method for controlling Nb-Ti composite precipitate in pipeline steel

Examples

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Embodiment 1

[0041] The heating temperature of the continuous casting slab is 1200°C, the thermal insulation coefficient is 0.9min / mm, the rough rolling entrance temperature is 1150°C, the rough rolling single-pass reduction is 20%, and the compression ratio is 2.5; the finish rolling entrance is 950°C, and the final rolling temperature is 780°C. The compression ratio is 4.6; the cooling start temperature is 740°C, the cooling rate is 20°C / s, and the final cooling temperature is 400°C.

comparative example 2

[0043] The heating temperature of the continuous casting slab is 1200°C, the thermal insulation coefficient is 0.9min / mm, the rough rolling entrance temperature is 1050°C, the rough rolling single-pass reduction is 20%, and the compression ratio is 2.5; the finish rolling entrance is 950°C, and the final rolling temperature is 780°C. The compression ratio is 4.6; the cooling start temperature is 740°C, the cooling rate is 20°C / s, and the final cooling temperature is 400°C.

[0044] Implementation Effect:

[0045]The microstructure analysis of the steel plate after rolling is carried out. The cross-section of the steel plate is taken, and after grinding and polishing, it is eroded by 4% nitric acid alcohol, and the width of the original flattened austenite is measured under the FEI scanning electron microscope. The measurement results are shown in Figure 2 ( As shown in a, b, and c), the average thickness of prior austenite grains in the embodiment of the present invention is a...

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Abstract

The invention discloses a rolling method for controlling an Nb-Ti composite precipitate in pipeline steel. According to chemical components of the pipeline steel, calculation is carried out through ametallurgical thermodynamics theory, so that the complete solution temperature of an NbC single-phase precipitate in the steel and a single-phase precipitation law of TiN are obtained. By utilizing adeformation-induced precipitation theory principle, the heating temperature of the Nb-Ti composite precipitate in the steel and an accurate rough rolling process of the composite precipitate are determined. According to the rolling method for controlling the Nb-Ti composite precipitate in the pipeline steel provided by the invention, the accurate control of the TiN-NbC composite precipitate can berealized, original austenite grains are thinned, the thinning functions of added Nb and Ti elements are maximized, and the toughness of the pipeline steel is improved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling and relates to controlling precipitates in steel, in particular to a rolling method for controlling Nb-Ti composite precipitates in pipeline steel. Background technique [0002] In recent years, with the rapid development of the domestic economy, the consumption and dependence of the economy on energy have increased dramatically. Since oil and natural gas are mostly produced in special areas such as remote mountains, deserts, and oceans, and areas with inconvenient transportation, the transportation of oil and gas resources is particularly important. Pipeline transportation is currently the most economical and efficient transportation method for oil and gas transportation. High-grade, large-diameter, high-pressure, and large-capacity oil and gas pipelines are the focus of current and future oil and gas pipeline construction. For example, the main line of the first-line pipeline of the West...

Claims

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Application Information

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IPC IPC(8): C21D8/02B21B37/00
CPCB21B37/00C21D8/0205C21D8/0226
Inventor 张继明迟玉红张仕新李光辉徐鹏李军喻春明
Owner XIJING UNIV
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