Low-cost X65 pipeline steel based on magnesium treatment, and manufacturing method thereof

A manufacturing method and low-cost technology, applied in the field of iron-based alloys, can solve the problem of high manufacturing cost of X65 pipeline steel, achieve good lattice mismatch relationship, refine grains, and promote precipitation.

Inactive Publication Date: 2019-02-26
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a low-cost X65 pipeline steel based on magnesium treatment and...

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  • Low-cost X65 pipeline steel based on magnesium treatment, and manufacturing method thereof
  • Low-cost X65 pipeline steel based on magnesium treatment, and manufacturing method thereof
  • Low-cost X65 pipeline steel based on magnesium treatment, and manufacturing method thereof

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with Embodiments 1-3; the molten iron ladle capacity for containing molten iron in the embodiment of the present invention is 250 tons. 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.

[0042] Table 1 Chemical composition of the steel of the embodiment of the present invention, unit: weight percent.

[0043]

[0044] The molten steel that meets the chemical composition requirements is obtained through converter smelting. The molten steel is treated with Ar blowing in the refining process of the refining furnace. The RH furnace is subjected to vacuum circulation degassing treatment and fine-tuning of the composition, and then the slab is continuously cast to obtain the continuous casting slab; the thickness of the continuous casting slab The length is 210-230mm, the width is 900-160...

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Abstract

The invention discloses a low-cost X65 pipeline steel based on magnesium treatment, and a manufacturing method thereof. A purpose of the present invention is mainly to solve the technical problem of high manufacturing cost of the existing X65 pipeline steel. According to the present invention, the low-cost X65 pipeline steel comprises the following chemical components by weight: 0.07-0.09% of C, 0.1-0.3% of Si, 1.35-1.45% of Mn, less than or equal to 0.006% of S, less than or equal to 0.015% of P, 0.035-0.045% of Nb, 0.010-0.025% of Ti, 0.0010-0.0030% of Mg, 0.020-0.030% of Al, less than or equal to 0.006% of N, and the balance of Fe and unavoidable impurities. According to the present invention, the metallographic structure of the hot-rolled steel plate comprises fine-grained ferrite, acicular ferrite and pearlite, and the elongation A after break of the hot-rolled steel plate having the thickness of 10.0-15.0 mm is more than or equal to 24%.

Description

technical field [0001] The invention relates to a pipeline steel, in particular to a low-cost X65 pipeline steel based on magnesium treatment and a manufacturing method thereof, belonging to the technical field of iron-based alloys. Background technique [0002] With the widespread use of oil and natural gas in various fields, the scope of the oil pipeline network is getting larger and larger, and the demand for pipeline steel used to produce oil pipelines is increasing, especially the demand for X65 pipeline steel used under ordinary conditions surge. Pipeline steel has high requirements on comprehensive properties, including strength, toughness, welding and corrosion resistance. The production technology of X65 pipeline steel is very mature, and domestic large-scale steel enterprises can basically produce stably, but due to the influence of alloy design and production line capacity, the cost varies greatly. Due to the low production threshold of X65 pipeline steel, the c...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/14C22C38/02C22C38/04C22C38/06C22C33/04C21C7/10B21C37/04
CPCB21C37/04C21C7/0006C21C7/10C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 邓丽琴张才贵
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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