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Method of producing seamless pipe and apparatus for performing the same

A technology of seamless steel pipe and manufacturing method, applied in the direction of manufacturing tools, metal processing equipment, workpiece surface treatment equipment, etc., can solve the problems of large fuel or electric power, consumption, and inability to become energy-saving, and achieve excellent results

Inactive Publication Date: 2012-04-04
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, any of the techniques disclosed in the aforementioned Patent Documents 1 to 3 requires a reheating furnace and an induction heating coil before the sizing mill, and therefore consumes a large amount of fuel or electric power, and cannot be used as a measure for energy saving.

Method used

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  • Method of producing seamless pipe and apparatus for performing the same
  • Method of producing seamless pipe and apparatus for performing the same
  • Method of producing seamless pipe and apparatus for performing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] In order to confirm the effect of the present invention, the above-mentioned figure 1 The shown manufacturing facility performed piercing-rolling, elongation rolling, and sizing rolling to manufacture seamless steel pipes of the following specifications.

[0071] Dimensions: outer diameter 406.4mm, wall thickness 30.7mm, length 12m

[0072] ·Material: low carbon steel (C: 0.6wt%)

[0073] During sizing rolling, the temperature of the elongated hollow shell was measured, and water was sprayed to the hollow shell at the amount of water shown in Table 1 below based on the temperature distribution in the longitudinal direction. In addition, for comparison, a test in which water injection was not performed was carried out.

[0074] (Table 1)

[0075] Table 1

[0076]

[0077] Immediately after sizing rolling, the temperature of the seamless steel pipe was measured, and after cooling the steel pipe, the outer diameter of the steel pipe was measured over the entire len...

Embodiment 2

[0082] Implementation using the above figure 1 The manufacturing equipment shown is piercing rolling, elongation rolling, sizing rolling, quenching, and tempering treatment, and the actual machine test of manufacturing seamless steel pipes of the following specifications is confirmed. impact of characteristics.

[0083] Dimensions: outer diameter 406mm, wall thickness 14mm, length 12m

[0084] ・Material: Low carbon steel with the composition shown in Table 2 below

[0085] ·Mechanical characteristics: API standard X65 level

[0086] (Table 2)

[0087] Table 2

[0088] Unit: mass%

[0089]

[0090] During sizing rolling, the temperature of the elongated hollow shell was measured, and water was sprayed to the hollow shell at the amount of water shown in Table 3 below based on the temperature distribution in the longitudinal direction. In addition, for comparison, a test in which water injection was not performed was carried out.

[...

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Abstract

In producing a seamless pipe, in which a hot billet is formed into a hollow shell by piercing / rolling by mean of a piercer, and subsequently transferred to a strech rolling mill without reheating to stretch / roll the hollow shell and finally formed into a seamless pipe by fixed diameter rolling by means of a fixed diameter rolling machine, the step 1 of measuring the temperature of the hollow shell at the outlet side of the strech rolling mill in the axial direction, and the step 2 of spraying water to cool the hollow shell at the inlet side of the fixed diameter rolling machine depending on the axial temperature distribution obtained for the hollow shell so as to achieve a uniform temperature distribution in the axial direction of the hollow shell are further included thereby preventing an uneven axial temperature distribution while saving energy.

Description

technical field [0001] The present invention relates to a method for manufacturing a seamless steel pipe by the Mannesmann pipe-making method and a seamless steel pipe manufacturing facility suitable for carrying out the manufacturing method. Background technique [0002] Seamless steel pipes are used for oil well pipes that require high strength and excellent toughness, and can be manufactured using the Mannesmann pipe making method. The control method consists of the following steps: [0003] (1) Using a piercer (piercer), a steel billet heated to a predetermined temperature is pierced and rolled, and formed into a hollow billet (hollow blank pipe); [0004] (2) Utilize the extension rolling mill (for example: mandrel type seamless tube rolling mill) to extend and roll the hollow tube billet; [0005] (3) Using a sizing mill (for example: a sizing machine (sizer), a tension reducer (stretch reducer)), the hollow tube blank to be stretched and rolled is sized and rolled t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B23/00B21B45/02
CPCB21B38/006B21B23/00B21B37/74B21B37/76B21B45/0215B21B2261/20
Inventor 千代祐辅
Owner NIPPON STEEL CORP
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