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Method for producing super large caliber seamless steel pipe

A technology for seamless steel pipes and production methods, applied in metal rolling and other directions, can solve problems such as serious product wall deviation, no extension machine, and affecting the quality of seamless steel pipes

Inactive Publication Date: 2007-11-28
沈阳东方钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional pipe jacking unit only repeats the extrusion process and is not equipped with an extension machine, so the product wall is very serious, which affects the quality of seamless steel pipes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] The steel ingot is cold centered by a centering machine, and then sent into a circular heating furnace with a diameter of 24m and heated to 1100-1200°C. After being released from the furnace, the iron oxide scale on the surface of the steel ingot is removed by high-pressure water, and then pierced by a hydraulic press. Then it enters the 3-4-roll cross-rolling extension machine with uniform wall, and then enters the roller pipe jacking unit for pipe jacking. After the pipe jacking, it passes through the rod stripping unit for stripping. The capillary after stripping is cut into cup-shaped pieces, and the cup-shaped pieces are heated in a reheating furnace at 1000-1100°C, and then enter the three-stand four-roller sizing unit for sizing, and the steel pipe after sizing is straightened by a pressure straightening machine, and then Packed into warehouse after inspection.

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PUM

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Abstract

The process of producing seamless steel pipe with very large caliber with cast steel ingot includes the following steps: cold centering the steel ingot, heating in a rotating hearth furnace to 1000-1200 deg.c, piercing in a hydraulic press, homogenizing wall in 3-4 roll rotary elongating machine, pushing with roll type pipe pushing jack, cutting into cup shell, heating in a furnace to 1000-1100 deg.c, sizing in 3 four roll sizing mills, straightening in straightening press, inspection and packing. The process adopts roll type extrusion of the cup shell in several sets of rollers, and has high product quality, fast extrusion speed and low power consumption.

Description

Technical field: [0001] The invention relates to a production method of a seamless steel pipe, in particular to a method for producing a super large diameter seamless steel pipe by a pipe jacking-roll extrusion method. technical background: [0002] The traditional pipe jacking unit only repeats the extrusion process and is not equipped with an extension machine, so the product wall deviation is very serious, which affects the quality of seamless steel pipes. Invention content: [0003] The purpose of the present invention is to provide a production method capable of producing super large-diameter seamless steel pipes. [0004] The technical solutions adopted are: [0005] The blanks used in the method are cast steel ingots and billets, and the steel types can be structural steel, stainless steel and high-grade alloy steel. After cold centering, the steel ingot is sent into the ring heating furnace and heated to 1000-1200°C. The heated steel ingot is pierced by a hydraul...

Claims

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Application Information

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IPC IPC(8): B23P13/00B21J5/10B21B19/10B21D3/00
Inventor 邢国泰周久乐
Owner 沈阳东方钢铁有限公司