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New technique for producing high alloy steel high-end pipe by adopting cross rolling elongation technology

A high-alloy steel, cross-rolling technology, used in elongation control, metal processing equipment, manufacturing tools, etc., can solve the problems of limited application, trouble, narrow deformation temperature range, etc., to improve quality, shorten the process, reduce The effect of equipment investment and operating costs

Inactive Publication Date: 2011-09-28
北京蓝海科融新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It is not difficult to see that since cross-rolling perforation is also an indispensable technical link in the existing steel pipe cross-rolling production process, this process is used to produce high-end pipes, especially high-alloy steel pipes with poor plasticity, narrow deformable temperature range, and high deformation resistance. When making steel pipes, perforation defects and excessive temperature drop will cause various technical troubles, thus limiting the popularization and application of the above-mentioned processes in the production of high-end high-end steel pipes.

Method used

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  • New technique for producing high alloy steel high-end pipe by adopting cross rolling elongation technology
  • New technique for producing high alloy steel high-end pipe by adopting cross rolling elongation technology
  • New technique for producing high alloy steel high-end pipe by adopting cross rolling elongation technology

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Embodiment Construction

[0037] Such as image 3 Shown is a process flow diagram of an embodiment of the present invention, comprising the following process steps:

[0038] In the first step, the P22 molten steel refined outside the furnace is centrifugally cast into a Φ341×74.5mm hollow tube billet through a centrifugal casting machine. In this step, the molten steel refined outside the furnace is the same as the prior art, and will not be repeated here; the centrifugal casting is carried out on a horizontal centrifugal casting machine with an angle of 0 degrees between the rotation axis of the mold and the horizontal. The cast hollow tube blank is a hollow tube blank with equal wall thickness and transparent ends. Using the centrifugal casting machine can conveniently and high-quality process the hollow tube billet used in the next step, without the need for heating and cross-rolling piercing of the continuous casting steel ingot or round billet in the prior art, which not only simplifies the proce...

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Abstract

The invention relates to a technique for producing a high alloy steel high-end seamless pipe by adopting cross rolling elongation technology without perforation, comprising: molten high alloy steel which is externally refined is made into a hollow shell by centrifugal casting; the outside surfaces of the front and the rear ends of the hollow shell are respectively processed to be a 'gripping head' and a 'tail end head' with conicity, and machining and quality inspection are carried out on the inside and the outside surfaces as well as the 'gripping head' and the 'tail end head' of the hollow shell; heating is carried out; a mandril is inserted into the heated hollow shell, and then the hollow shell is sent into a cross rolling elongating mill for cross rolling, so that the pipe fittings having the wall thickness, the diameter and the length being in accordance with the requirements can be produced; the mandril is removed, and the head and the tail are cut off; finally, the qualified finished pipes can be obtained after sizing, heat treatment for finished product and finishing operation. The technique has short process flow and does not need cross rolling perforation, thus reducing the cost and improving the quality; due to small tapered treatment for the front and the rear ends, 'tail triangle' is avoided when the medium-thick walled pipes are produced, and the performance of secondary gripping is improved, thus improving the quality of the product and the production efficiency.

Description

Technical field: [0001] The invention relates to the manufacturing technology of seamless steel pipes, in particular to the manufacturing technology of high-end seamless steel pipes with large diameter, medium-thick wall and high alloy steel. Background technique: [0002] Steel has good comprehensive performance, can bear the required load and have the required service life cycle under different working conditions, and has good process performance. It is an indispensable and important basic material for national economic construction. Generally speaking, carbon-iron alloys with a carbon content of 0.02%-2% are called steel, and carbon-iron alloys with a carbon content greater than 2% are called cast iron. According to different classification standards, steel can be divided into different categories. According to the chemical composition of steel, it can be divided into carbon steel and alloy steel: [0003] In addition to iron and carbon, the components in carbon steel a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/06B22D13/02B21B37/56B21C45/00B21B19/06
Inventor 刘怀文马晓梅朱玉宝
Owner 北京蓝海科融新技术有限公司
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