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Method for producing seamless steel pipes used for large-diameter high-pressure gas cylinders

A technology for high-pressure gas cylinders and seamless steel pipes, which is applied in the field of seamless steel pipe manufacturing, can solve the problems of low output, high production cost, poor external surface quality, etc., and achieves the effects of large output, low cost and simple method.

Active Publication Date: 2011-01-26
攀钢集团成都钢铁有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-pressure gas cylinder steel pipe produced by this production process has poor dimensional accuracy, poor inner and outer surface quality, and the product quality cannot meet the requirements. It needs to be mechanically polished to achieve
And the output is low, the production cost is high

Method used

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  • Method for producing seamless steel pipes used for large-diameter high-pressure gas cylinders
  • Method for producing seamless steel pipes used for large-diameter high-pressure gas cylinders
  • Method for producing seamless steel pipes used for large-diameter high-pressure gas cylinders

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Embodiment Construction

[0033] 1. Specifications and steel types required for production, that is, the types of steel pipes prepared according to the embodiment of the present invention, the specific indicators are shown in Table 1.

[0034] Table 1

[0035]

[0036] Note: The steel grade is 4130 in the ASTM A519 standard.

[0037] Nominal Wall Thickness: Designated for design, this use is distinguished from actual wall thickness, which may fluctuate above and below the nominal.

[0038] 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.

[0039] Usually users can order in one of the two forms of nominal wall thickness or minimum wall thickness.

[0040] 2. Production process:

[0041] (1) Length measurement, weighing and sawing of circular continuous casting slabs smelted by LF refining furnace + VD vacuum treatment; see Table 2.

[0042] Table 2 ...

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Abstract

The invention relates to a method for producing seamless steel pipes used for large-diameter high-pressure gas cylinders, which belongs to the field of seamless steel pipe manufacturing and solves the technical problem of meeting the requirements for geometrical dimensional accuracy and inner / outer surface quality of the seamless steel pipe used for the large-diameter high-pressure gas cylinder (the outer diameter Phi ranging from 406mm to 559mm) while reducing the production costs. The technical proposal is as follows: the seamless steel pipe is manufactured by processing a round continuous-cast blank to a pipe blank by using a 340mmMPM multi-stand pipe mill unit and drawing the pipe blank by using a 100-ton drawing-pulling pipe expander unit. The 100-ton drawing-pulling pipe expander unit works in the small-deformation multi-channel deformation mode, with a total expansion rate less than or equal to 36%, and ensures the dimensional accuracy of the steel pipe product. The expansion rate is controlled below 25% per one time of heating the pipe blank. The number of times of diameter-extension and wall thickness reduction is not more than 4. The expansion of diameter is not more than 45mm at each time. The expanding temperature at the last time should be higher than 780 DEG C.

Description

technical field [0001] The invention relates to a production method of a seamless steel pipe for a large-diameter high-pressure gas cylinder, belonging 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 gas cylinder pipe and the qua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B23/00B21B37/16C21D9/70C21D11/00B21B19/08B21B19/04B21B17/02
Inventor 尹人洁成海涛晏如边华川张涛吕建刚王婀娜
Owner 攀钢集团成都钢铁有限责任公司
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