Production method of large-wall-thickness straight-seam submerged-arc-welded pipeline steel plate

A technology of straight seam submerged arc welding and production methods, which is applied in the field of pipeline steel plates, can solve the problems of pipe manufacturers and base metal production plants, the roundness of steel pipes exceeds the standard requirements, and affects the production rhythm of steel pipe factories, etc., and achieves the same plate mechanics The effects of high performance uniformity, small grain size variance, and small roundness deviation

Active Publication Date: 2018-01-30
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology allows for producing pipes with very thin walls that have consistently good strength even when bent or formed into complex shapes without losing their shape over time. It also improves its overall quality compared to traditional methods like welding plates used during manufacturing processes.

Problems solved by technology

This technical problem addressed by this patented method relating to improving the circular shape accuracy of thin gauge steels used during construction processes such as deep water drilling operations. Specifically, there have been issues related to variations in mechanical property values along different directions within these materials due to differences in their physical dimensions caused by factors like thermal effects from heat treatment cycles at elevated temperatures. These challengings require improvement through advanced techniques called ultraviolet laser testing before implementation into actual industrial applications.

Method used

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  • Production method of large-wall-thickness straight-seam submerged-arc-welded pipeline steel plate
  • Production method of large-wall-thickness straight-seam submerged-arc-welded pipeline steel plate
  • Production method of large-wall-thickness straight-seam submerged-arc-welded pipeline steel plate

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Experimental program
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Effect test

Embodiment 1

[0062] Embodiment 1: The production method of the large wall thickness longitudinal submerged arc welding pipeline steel plate adopts the following specific process.

[0063] (1) Steelmaking-continuous casting process: the weight percentage of casting slab composition is: C: 0.03%, Si: 0.045%, Mn: 1.7%, P: 0.014%, S: 0.0016%, Als: 0.015%, Cr: 0.30%, Nb: 0.070%, Ti: 0.030%, and the balance is Fe and unavoidable impurities.

[0064] (2) Heating process: the temperature of the heating section is 1190°C, the temperature of the soaking section is 1140°C, the temperature of the soaking section is kept for 90 minutes, and the difference between the temperature of the heating section and the temperature of the soaking section is 50°C.

[0065] (3) Rolling process: TMCP double-pass rolling process is adopted; in the first rolling pass, the starting temperature is 1120°C, the temperature at the end pass is 1040°C, and the reduction rate at the end pass is 25.0%; The rolling temperature ra

Embodiment 2

[0070] Embodiment 2: The production method of the large wall thickness longitudinal submerged arc welding pipeline steel plate adopts the following specific process.

[0071] (1) Steelmaking-continuous casting process: the weight percentage of casting slab composition is: C: 0.04%, Si: 0.038%, Mn: 1.62%, P: 0.010%, S: 0.0010%, Als: 0.031%, Cr: 0.28%, Nb: 0.067%; Ti: 0.027%, the balance is Fe and unavoidable impurities.

[0072] (2) Heating process: the temperature of the heating section is 1182°C, the temperature of the soaking section is 1130°C, the temperature of the soaking section is kept for 76 minutes, and the difference between the temperature of the heating section and the temperature of the soaking section is 52°C.

[0073] (3) Rolling process: TMCP double-pass rolling process is adopted; in the first rolling pass, the starting temperature is 1112°C, the temperature at the end pass is 1031°C, and the reduction rate at the end pass is 26.3%; The rolling temperature range

Embodiment 3

[0078] Embodiment 3: The production method of the large wall thickness longitudinal submerged arc welding pipeline steel plate adopts the following specific process.

[0079] (1) Steelmaking-continuous casting process: the weight percentage of casting slab composition is: C: 0.05%, Si: 0.029%, Mn: 1.6%, P: 0.012%, S: 0.0008%, Als: 0.037%, Cr: 0.25%, Nb: 0.064%; Ti: 0.025%, the balance is Fe and unavoidable impurities.

[0080] (2) Heating process: the temperature of the heating section is 1168°C, the temperature of the soaking section is 1125°C, the temperature of the soaking section is 64 minutes, and the difference between the temperature of the heating section and the temperature of the soaking section is 43°C.

[0081] (3) Rolling process: TMCP dual-pass rolling process is adopted; in the first rolling pass, the starting temperature is 1110°C, the temperature at the end pass is 1025°C, and the reduction rate at the end pass is 27.5%; The rolling temperature is 925°C, and the

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Abstract

The invention discloses a production method of a large-wall-thickness straight-seam submerged-arc-welded pipeline steel plate, comprising the steps of smelting and continuous casting, heating, rolling, cooling, and straightening; in the step of smelting and continuous casting, a casting blank from the continuous casting comprises, by weight, 0.03-0.07% of C, </=0.10% of Si, 1.5-1.7% of Mn, </=0.015% of P, </=0.002% of S, 0.015-0.045% of Als, 0.20-0.30% of Cr, 0.055-0.070% of Nb, 0.010-0.030% of Ti, and the balance of Fe and unavoidable impurities. A large-wall-thickness pipeline steel base product produced via the method has uniform mechanical properties at 0/4, 2/4 and 4/4 along its thickness in directions perpendicular to and parallel to the rolling direction, with small differences in metallographic structure type and grain size; after production, a difference between maximum diameter and minium diameter of end ports of a steel pipe is 0.1-1.2 mm, end roundness deviations of the steel pipe range from 0.5 mm to 4.5 mm, and roundness index is increased by 55-70%. The large-wall-thickness straight-seam submerged-arc-welded pipeline steel plate produced via the method has the advantages such as high uniformity of mechanical properties, and small roundness deviation and high index after subsequent pipe forming.

Description

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Claims

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Application Information

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Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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