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Production method of large wall thickness longitudinal submerged arc welding pipeline steel plate

A technology of straight seam submerged arc welding and production method, applied in the field of pipeline steel plates, can solve the problems of pipe making enterprises and base metal production plants, the roundness of steel pipes exceeds the standard requirements, and the production rhythm of steel pipe factories is affected, and the same plate mechanics can be achieved. High performance uniformity, small grain size variation, and small roundness deviation

Active Publication Date: 2019-03-22
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the forming process of the pipeline steel base material, the welding process after O forming, large wall thickness (that is, the thickness of the steel plate ≥ 25mm) often has uneven weld seams, or the roundness of the steel pipe after welding exceeds the standard requirements. After the final size inspection, it needs to be re- Checking the roundness of the steel pipe affects the overall production rhythm of the steel pipe factory and increases the production cost
It has brought great troubles to pipe manufacturers and base material manufacturers

Method used

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  • Production method of large wall thickness longitudinal submerged arc welding pipeline steel plate
  • Production method of large wall thickness longitudinal submerged arc welding pipeline steel plate
  • Production method of large wall thickness longitudinal submerged arc welding pipeline steel plate

Examples

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...

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 ra...

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 ...

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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

technical field [0001] The invention relates to a pipeline steel plate, in particular to a production method of a large wall thickness straight seam submerged arc welded pipeline steel plate. Background technique [0002] Large diameter, large wall thickness, high conveying pressure, long conveying distance and multiple conveying media are the main signs of the technological progress of the pipeline industry, and are also the general trend of the development of the pipeline industry. put forward higher requirements. It is an inevitable trend in the development of the pipeline industry to adopt LSAW pipes for long-distance oil and gas pipelines. UOE (Uing-Oing forming process) is a process technology that uses wide and thick steel plates to manufacture large-diameter straight seam welded pipes. UOE steel pipes are currently the pipeline pipes with the best quality, highest reliability and widest diameter range in the international market. The process flow of UOE pipe making...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/02C22C38/28C22C38/26C22C38/06C21D8/02
Inventor 刘红艳李玉谦杜琦铭管连生许建波连妙芳姚宙侯俊涛
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY