Method for producing large-diameter seamless steel pipe for gas cylinder

A technology of seamless steel pipe and production method, applied in metal rolling and other directions, can solve the problems of poor outer surface quality, low output and high production cost, and achieve the effects of good inner and outer surface quality, high dimensional accuracy and simple production.

Active Publication Date: 2013-11-06
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +1
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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 large-diameter seamless steel pipe for gas cylinder
  • Method for producing large-diameter seamless steel pipe for gas cylinder
  • Method for producing large-diameter seamless steel pipe for gas cylinder

Examples

Experimental program
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Effect test

specific Embodiment approach

[0031] The present invention takes circular continuous casting billet as billet, and adopts 340MPM restraint mandrel continuous pipe rolling machine+push type diameter expanding method to produce. It is characterized in that: during the push-type diameter expansion process, the temperature of the heated steel pipe should be controlled at 900-950°C, and the pushing speed: 90-120mm / min. Preferably 100-110 mm / min. The specific implementation method comprises the following steps:

[0032] a. Blank heating

[0033] Choose converter or electric furnace + refining outside furnace + vacuum treatment to smelt circular continuous casting slabs (with specifications of ∮350mm and ∮388mm), and heat them in a ring heating furnace. The furnace maintains a slightly reducing atmosphere, and the heating must not have yin and yang sides, heating impermeability, overheating or overburning. The heating time of ∮350mm round continuous casting slab is 240-300 minutes; the heating time of ∮388mm r...

Embodiment 1

[0060] a. Blank heating

[0061] The circular continuous casting slabs smelted by LF refining furnace + VD vacuum treatment were measured, weighed and sawn;

[0062] table 3

[0063] Billet diameter (mm)

Blank length (m)

Billet weight (Kg)

∮388

3.96

3676

∮350

3.86

2915

∮350

2.95

2226

[0064] The furnace maintains a slightly reducing atmosphere, and the heating must not have yin and yang sides, heating impermeability, overheating or overburning. The heating parameters are shown in Table 4.

[0065] Table 4

[0066]

[0067] b. Conical roll piercer perforation:

[0068] After heating the billet in the ring furnace, according to different production specifications, the corresponding perforated plug size is selected, and the outer diameter of the capillary tube is controlled at 428-432mm.

[0069] c. 340MPM continuous pipe rolling mill:

[0070] The 5 racks form an angle of 45° with th...

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Abstract

The invention relates to a method for producing a large-diameter seamless steel pipe for a gas cylinder, in particular to the method for producing the large-diameter seamless steel pipe for the gas cylinder in a pushing diameter-expansion way, which belongs to the field of manufacture of seamless steel pipes. The technical problem to be solved is to provide the method for producing the large-diameter seamless steel pipe for the gas cylinder, wherein the large-diameter seamless steel pipe has high geometric dimension precision and high quality of inner and outer surfaces. The technical scheme adopted by the invention is that: circular continuously cast blooms are processed to form pipe blanks by a 340 retained mandrel pipe mill (MPM), and pushing diameter-expansion is performed to obtain the large-diameter seamless steel pipes, wherein the overall-length wall thickness tolerance and wall thickness and section ranges of the pipe blanks provided by the 340MPM are controlled to be less than or equal to 1.8mm, and the thermal external diameter phi is 367 to 365mm; and the single lightweight high-pressure gas cylinder pipes can be produced, and have the external diameters of 550mm, the external diameter tolerance of + / -1 percent, the wall thicknesses of 10 to 20mm, the wall thickness tolerance of 0 to +25 percent, the lengths of 11.0 to 12.5m, high dimension accuracy and high quality of inner and outer surfaces. The method ensures production simplicity and low cost.

Description

technical field [0001] The invention relates to a method for producing seamless steel pipes for large-diameter gas cylinders by adopting a push-type diameter-expanding method, and belongs to the field of seamless steel pipe manufacturing. Background technique [0002] With the shortage of energy in the world, the development of natural gas is imperative. However, my country's natural gas reserves are abundant, especially in the western region, and the development and use of natural gas have unique advantages in ground sources. Compressed natural gas (CNG) has been widely used as an economical and environmentally friendly green energy for urban transportation. [0003] Tube bundle trailers are mainly used to transport and store compressed natural gas (CNG). The advantages of large-scale high-pressure seamless containers, such as safety, reliability, space saving, and convenient installation, have won unanimous praise from users. Gas supply provides great convenience for the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B23/00B21B19/08
Inventor 尹人洁张涛吕建钢刘云涛王婀娜
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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