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A method for manufacturing seamless steel pipes for long-pipe trailer gas cylinders

A technology for seamless steel pipes and manufacturing methods, applied in the field of manufacturing large-diameter seamless steel pipes, capable of solving problems such as uneven wall thickness, poor quality of the inner and outer surfaces of steel pipes, and low wall thickness precision

Active Publication Date: 2020-10-27
DEXIN STEEL PIPE CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for manufacturing seamless steel pipes for long-tube trailer gas cylinders, so as to solve the problems of low wall thickness precision and uneven wall thickness in the prior art in the manufacturing method of seamless steel pipes for long-tube trailer gas cylinders and the poor quality of the inner and outer surfaces of steel pipes

Method used

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  • A method for manufacturing seamless steel pipes for long-pipe trailer gas cylinders
  • A method for manufacturing seamless steel pipes for long-pipe trailer gas cylinders
  • A method for manufacturing seamless steel pipes for long-pipe trailer gas cylinders

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Embodiment Construction

[0040] In order to facilitate understanding of the present invention, the present invention enumerates the following examples. It should be clear to those skilled in the art that the embodiments are only for helping to understand the present invention, and should not be regarded as specific limitations on the present invention.

[0041] In this embodiment, a method for manufacturing a seamless steel pipe for a long-tube trailer gas cylinder, the product specification is: 715x21.5x12300mm seamless steel pipe, the material of the steel pipe is 4130X, and the technical requirements are shown in the following table:

[0042]

[0043] The specific implementation steps are as follows:

[0044] Step a: The continuous casting slab with a diameter of 500 mm and a length of 3500 mm is heated in an annular heating furnace for 610 minutes at a heating temperature of 830°C to 1290°C, and the temperature of the continuous casting slab is 1250°C;

[0045] Step b: piercing the heated cont...

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Abstract

The invention provides a manufacturing method of a seamless steel pipe for a long pipe trailer gas cylinder. The manufacturing method of the seamless steel pipe for the long pipe trailer gas cylindercomprises the steps that a continuous rolling mill is used for rolling a waste pipe, a sizing mill is used for sizing, a jacking type thermal expansion unit is used for expanding the diameter, and a hydraulic straightening machine and a six-roll straightening machine are used for two-step straightening and rounding; and a precision cold drawing unit is used for first cold drawing, 100% automatic ultrasonic thickness measurement is carried out, an internal mold mandrel used in the second cold drawing is selected according to the average wall thickness and the minimum wall thickness of each tubular billet, and then the second cold drawing is carried out. According to the manufacturing method of the seamless steel pipe for the long pipe trailer gas cylinder, production mode is flexible, initial investment cost is low, and no environmental pollution exists and the seamless steel pipe for the long pipe trailer gas cylinder manufactured by the method has wide size range, high geometric accuracy and good internal and external surface quality, and the range of the actual weight of a finished product exceeding the theoretical weight does not exceed 7.5%.

Description

technical field [0001] The invention belongs to the manufacturing technology of large-diameter seamless steel pipes, and in particular relates to a manufacturing method of seamless steel pipes for long-tube trailer gas cylinders with a diameter of 540 mm to 720 mm. Background technique [0002] Long-tube trailer gas cylinders refer to large-volume seamless gas cylinders assembled into long-tube trailers and tube bundle containers for high-pressure gas transportation. The water volume of a single gas cylinder is usually more than 1,000 liters. In China, the total weight of long-tube trailers with full load is limited to 40 tons. In order to improve the volume-to-weight ratio and transportation efficiency, the manufacturer of long-tube trailer gas cylinders puts forward strict requirements on the wall thickness accuracy and weight of the seamless steel pipes used, hoping to ensure the minimum design wall thickness of long-tube trailer gas cylinders, and to Make the actual wei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/06
CPCB21C37/06
Inventor 陈冬桑伟王洪海王本军刘洪锁陈星星董西岳吴宜檑
Owner DEXIN STEEL PIPE CHINA
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