Manufacturing method of seamless steel pipe for long pipe trailer gas cylinder with diameter of 920mm

A technology of seamless steel pipes and manufacturing methods, which is applied in the field of manufacturing large-diameter seamless steel pipes, can solve the problems of unguaranteed comprehensive mechanical properties, low material utilization rate, and high manufacturing costs, so as to improve manufacturing precision and product pass rate, The effect of reducing monomer weight, improving production efficiency and product qualification rate

CN109500130AActive Publication Date: 2019-03-22DEXIN STEEL PIPE CHINA
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-03-22

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Abstract

The invention provides a manufacturing method of a seamless steel pipe for a long pipe trailer gas cylinder with a diameter of 920mm, and belongs to the manufacturing technology of large diameter seamless steel pipes. The manufacturing method comprises the steps that the chemical composition of seamless steel pipe materials is optimized, and the hardenability of the composition is improved; afterusing a 820 cross rolling mill to pierce, a waste pipe is rolled, a jacking type hot expanding unit is used for expanding the diameter, a hydraulic type 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 two cold pullout. According to the manufacturing method of the seamless steel pipe for the long pipe trailer gas cylinder with the diameter of 920mm, the manufacturing cost is low, the material utilization rate is high, and the mode of production is flexible; and moreover, the phi 920mm seamless steel pipe manufactured by the method has high geometric accuracy, good internal and external surface quality, good hardenability and high comprehensive performance, and the range of the actual weight of a finished product exceeding the theoretical weight does not exceed 7.5%.
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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 920 mm. Background technique

[0002] China began to manufacture large-volume long-tube trailer gas cylinders in 2001. After more than ten years of development, the diameter has grown from 559mm to 715mm, and the single water volume has increased from 2250L to 4170L. The trend is to develop in the direction of larger diameter and larger water volume. At present, long-tube trailer gas cylinders with a diameter of 914-920mm and a single water volume of 6500-7000L are being developed in China. The development of large-diameter seamless steel pipes that meet the requirements in size, precision and performance is the key to the development of this large-volume long-tube trailer gas cylinder. Bottle key. At the same time, in order to i...

Examples

Embodiment Construction

[0040] In order to facilitate understanding of the present invention, the present invention enumerates the following examples.

[0041] In this example, a method for manufacturing a seamless steel pipe for a long-tube trailer gas cylinder with a diameter of 920mm, the product specification is: 920x22.8x12290mm seamless steel pipe, the material of the steel pipe is 4130X, and the size and weight requirements of the product are as follows surface:

[0042]

[0043] The mechanical performance requirements of the product are shown in the table below:

[0044]

[0045] The specific manufacturing process of the seamless steel pipe for long-tube trailer gas cylinders with a diameter of 920 mm is as follows:

[0046] Step a: The continuous casting slab with a diameter of 600mm is heated to 1250°C-1280°C in an annular heating furnace, and the temperature of the continuous casting slab is 1250°C;

[0047] In terms of mass percentage, the chemical composition of the continuous ca...