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Method of measuring large deformation resistant pipeline steel SH-CCTA curve

A SH-CCT, anti-large deformation technology, applied in the preparation of test samples, thermal expansion coefficient of materials, etc.

Inactive Publication Date: 2017-11-17
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the influence of welding metallurgical characteristics, softening zones and welding defects may appear near the weld

Method used

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  • Method of measuring large deformation resistant pipeline steel SH-CCTA curve
  • Method of measuring large deformation resistant pipeline steel SH-CCTA curve
  • Method of measuring large deformation resistant pipeline steel SH-CCTA curve

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Embodiment Construction

[0021] Below in conjunction with embodiment the present invention is described in further detail.

[0022] The embodiment of the present invention is given by taking pipeline steel X70 as an example. The specific steps are:

[0023] (1) First, use a round bar sample of φ6×86mm to measure the solid phase transition point of X70 grade pipeline steel. The sample was heated to 500°C for 30 minutes, and then slowly heated to 1000°C at a rate of 0.05°C / s, and the Ac1 and Ac3 of the material were determined according to the measured temperature rise thermal expansion curve.

[0024] (2) The measurement process of the SH-CCT curve of X70 pipeline steel is as follows: heat the sample at a rate of 150 °C / s to a peak temperature of 1300 °C, and hold for 1 s. The cooling time from 1300°C to 900°C is fixed at 9s. Then at 0.05°C / s, 0.1°C / s, 0.3°C / s, 0.5°C / s, 1°C / s, 3°C / s, 5°C / s, 10°C / s, 20°C / s, 30°C / s, 50°C / s, 80°C / s, 100°C / s and 200°C / s with a series of different cooling rates to cool...

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Abstract

The invention discloses a method of measuring a large deformation resistant pipeline steel SH-CCTA curve, which is a simulated HAZ continuous cooling transformation curve. According to the method, welding conditions are simulated to heat a sample; a CCT dilatometer is used to measure the critical points (Ac1 and Ac3), expanding curves under different cooling speeds are measured; a tangent method is used to determine the temperature of a phase transformation point under different cooling speeds; a metallographic method under the assistance of a hardness method is used to analyze and determine a room temperature tissue; and finally a complete SH-CCT curve is drawn. On one aspect, the method can be used to evaluate the welding property of steel or predict the tissue and performance of welding heat affected zone; and on the other aspect, a technical reference is provided for designing a proper welding technology, in particular, welding line energy.

Description

technical field [0001] The invention relates to a method for measuring the SH-CCT curve of large-deformation-resistant pipeline steel, which belongs to the technical field of steel welding thermal simulation analysis. Background technique [0002] Since the alloying and super-accelerated cooling process experienced by the large-deformation-resistant pipeline steel during processing can effectively inhibit the grain growth in the heat-affected zone near the weld during on-site welding, the large-deformation-resistant pipeline steel generally has good properties. Weldability and excellent HAZ toughness. However, due to the influence of welding metallurgical characteristics, softening zones and welding defects may appear near the weld. For pipelines subjected to large displacements, the strain will be strongly concentrated in the HAZ softening zone and the low-matching weld zone, which will have a direct impact on the deformation capacity of the pipeline. [0003] The mechani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/16G01N1/34
CPCG01N1/34G01N25/16
Inventor 秦志强钱刚许晓红白云康智清范海东兰楚惠周莉萍
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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