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Method for producing seamless steel pipe for producing gas cylinder with heavy caliber for hauled vehicle

A technology for high-pressure gas cylinders and seamless steel pipes, which is applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve problems such as difficult production, and achieve the effects of low cost, simple process and large output.

Active Publication Date: 2009-05-27
攀钢集团成都钢铁有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The seamless steel pipes used are larger in diameter and longer in length, and sometimes require thinner walls and higher performance, so it is more difficult to produce

Method used

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  • Method for producing seamless steel pipe for producing gas cylinder with heavy caliber for hauled vehicle
  • Method for producing seamless steel pipe for producing gas cylinder with heavy caliber for hauled vehicle
  • Method for producing seamless steel pipe for producing gas cylinder with heavy caliber for hauled vehicle

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Embodiment Construction

[0031] 1. The steel pipe specifications and steel types required to be prepared,

[0032] The types of steel pipes prepared according to the embodiment of the present invention are required, and the specific indexes are shown in Table 1.

[0033] Table 1

[0034]

[0035] Note: The steel grade is 4130 in the ASTM A519 standard.

[0036] Nominal Wall Thickness: Designated for design, this use is distinguished from actual wall thickness, which may fluctuate above and below the nominal.

[0037] Minimum Wall Thickness: Specifies the minimum wall thickness used for design, this usage is to be distinguished from the actual wall thickness, which may fluctuate above the minimum wall thickness.

[0038] Usually users can order in one of the two forms of nominal wall thickness or minimum wall thickness.

[0039] 2. Production process:

[0040] (1) Large-section round corrugated steel ingot smelted by LF refining furnace + VD vacuum treatment; see Table 2.

[0041] Table 2

[0...

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Abstract

The invention relates to a method for manufacturing a seamless steel pipe of a large-aperture high pressure cylinder for producing a trailer and belongs to the field of manufacturing a seamless steel pipe. The invention mainly solves the technical problem of satisfying the physical dimension precision and the quality requirements on internal and external surfaces of the seamless steel pipe of the large-aperture high pressure cylinder for the trailer at low cost. The invention adopts the technical proposal that after being perforated, a heavy-section round wave steel ingot is formed by being rolled by a step rolled mill and then drawn by a drawing aperture enlarging machine set; the tolerance of the wall thickness of a pipe blank rolled by the step rolled mill is S-8<10> percent and the extreme deviation is less than or equal to 2.5 mm; when the drawing pipe expander set is expanded and manufactured, the aperture enlargement ratio is controlled to be less than 25 percent when the pipe blank is heated each time; the aperture enlargement and the wall reduction are conducted for at most 4 times; the aperture enlargement magnitude of each time is not larger than 45 mm; and the expanding and manufacturing temperature is larger than 780 DEG C at the last expanding and manufacturing.

Description

technical field [0001] The invention relates to a method for manufacturing a seamless steel pipe for producing a large-diameter high-pressure gas cylinder for a trailer, and belongs to the field of seamless steel pipe manufacturing. Background technique [0002] In recent years, the manufacture of high-pressure gas cylinders has changed from being made of steel billets through punching and drawing to being made of thin-walled seamless steel pipes, and it has become a development trend in the world. The demand for CNG trailer bottles for vehicles and gas cylinders for filling stations has increased significantly, and the demand for large-diameter gas cylinder tubes in the market has also increased accordingly. In addition to the strength and other mechanical properties of the seamless steel pipe for gas cylinders, it is also required to be light in weight and reduce unnecessary burdens. Therefore, the geometric dimension accuracy such as the diameter and wall thickness of the...

Claims

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Application Information

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IPC IPC(8): B21B23/00B21B37/16C21D9/70C21D11/00B21B19/08B21B19/04
Inventor 尹人洁成海涛晏如边华川张涛李旭马欢鱼王婀娜
Owner 攀钢集团成都钢铁有限责任公司
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