Hot rolled steel plate with yield strength of 290 MPa for longitudinal profile welded pipe

A technology of hot-rolled steel plate and yield strength, which is applied in the field of steel for oil and gas pipelines, can solve problems such as unsatisfactory performance, and achieve the effects of filling the gap in the industry, reducing manufacturing costs, and stabilizing performance

Inactive Publication Date: 2020-07-07
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology

[0008] The purpose of the present invention is to provide a hot-rolled steel plate for longitudinal section welded pipe with a yield strength of 290MPa and its manufacturing method, mainly to solve the technical problem that the product performance of the existing hot-rolled steel plate for pipelines with a yield strength of 290MPa cannot meet the technical problems of oil and gas welded pipe manufacturers

Method used

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  • Hot rolled steel plate with yield strength of 290 MPa for longitudinal profile welded pipe
  • Hot rolled steel plate with yield strength of 290 MPa for longitudinal profile welded pipe
  • Hot rolled steel plate with yield strength of 290 MPa for longitudinal profile welded pipe

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with Examples 1-4, as shown in Tables 1-3.

[0045] Table 1 is the chemical composition (by weight percentage) of the steel of the embodiment of the present invention, and the balance is iron and unavoidable impurities.

[0046] Table 1 Chemical composition of the steel of the embodiment of the present invention, unit: weight percent.

[0047]

[0048] Through converter smelting, desulfurization treatment in the refining process of LF ladle refining furnace, vacuum cycle degassing treatment in RH furnace, and composition fine-tuning, molten steel meeting the composition requirements is obtained, and continuous casting slabs are obtained through continuous casting. The thickness of the continuous casting slab is 210-230mm, the width is 900-1600mm, and the length is 8000-11700mm.

[0049] The cut-to-length slab produced by steelmaking is sent to the heating furnace for heating, and after being descal...

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Abstract

The invention discloses a hot rolled steel plate with yield strength of 290 MPa for a longitudinal profile welded pipe and primarily solves the technical problem that the product performance of an existing hot rolled steel plate with yield strength of 290 MPa for a pipeline cannot meet petroleum and gas welded tube manufacturing enterprises. The hot rolled steel plate with yield strength of 290 MPa for the longitudinal profile welded pipe comprises the chemical components in percent by weight: 0.06-0.08% of C, 0.07-0.12% of Si, 0.60-0.70% of Mn, less than or equal to 0.018% of P, less than orequal to 0.005% of S, less than or equal to 0.0060% of N, 0.010-0.045% of Al, 0.010-0.020% of Ti, 0.010-0.020% of Nb and the balance iron and inevitable impurities. According to the hot rolled steel plate, the percentage elongation after fracture A50 mm is 35-60% and the impact energy value Akv at 5 DEG C below zero is greater than or equal to 70 J.

Description

technical field [0001] The present invention relates to a steel for oil and gas pipelines, in particular to a hot-rolled steel plate for a longitudinally sectioned welded pipe with a yield strength of 290 MPa, in particular to a hot-rolled steel plate for a longitudinally sectioned welded pipe with a yield strength of 290 MPa and a manufacturing method thereof. The pipeline used for manufacturing oil and gas transportation belongs to the technical field of steel for oil and gas pipelines. Background technique [0002] Pipeline transportation is the most economical and safest transportation method for long-distance transportation of oil and natural gas. It has the characteristics of high efficiency, economy, safety and no pollution. In order to improve transmission efficiency, reduce energy consumption, and reduce investment, it has become a trend for long-distance pipelines to develop high-pressure and large-diameter transmission. It has promoted the continuous development ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C22C38/12C21D8/02
CPCC21D8/0226C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 徐国利
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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