Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

New method for producing medium and large caliber alloy steel seamless pipe by utilizing radial forging technology

A radial forging and large-diameter technology, which is applied in the direction of manufacturing tools, metal processing equipment, forging/pressing/hammer devices, etc., can solve the problem of weakening the technical and economic advantages of radial forging forming technology alloy seamless pipes, large-diameter alloy steel pipes Billet production is difficult, it is difficult to achieve the expected goal, etc., to achieve the effect of reducing multiple reheating links, shortening heating time, and narrow deformation temperature range

Active Publication Date: 2010-06-09
北京蓝海科融新技术有限公司
View PDF0 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest limitation mainly comes from two aspects: on the one hand, the production of medium and large-diameter alloy steel pipe billets is extremely difficult, and the quality is also difficult to be guaranteed, because the alloy steel pipe billets in the production process of the existing technology, in its central part It is very easy to form a cavity, which produces the so-called "Mannesmann effect", leaving various surface and internal defects. For example, the inner wall of the exposed cavity often forms internal folding defects, and the closed cavity is easy to produce. All kinds of delamination defects are fatal to high-end pipes; on the other hand, the production process of medium and large-diameter alloy steel pipe blanks in the prior art is very complicated, which obviously weakens the production capacity of radial forging forming technology. Technical and Economic Advantages of Alloy Seamless Pipes
Therefore, people's previous attempts are difficult to achieve the desired goal

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • New method for producing medium and large caliber alloy steel seamless pipe by utilizing radial forging technology
  • New method for producing medium and large caliber alloy steel seamless pipe by utilizing radial forging technology
  • New method for producing medium and large caliber alloy steel seamless pipe by utilizing radial forging technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] The specific implementation manner of the present invention will be described below in conjunction with the accompanying drawings.

[0035] Such as figure 1 , figure 2 As shown, an embodiment of the radial forging machine used to produce Φ273×28×8500mm difficult-to-machine 1Cr18Ni9 austenitic stainless steel seamless steel pipe provided by the present invention, its process steps:

[0036] In the first step, the 1Cr18Ni9 molten steel refined outside the furnace is cast by a centrifugal casting machine into a hollow tube billet of Φ404×94mm with a length of 2130mm. 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. The centrifugal casting...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a new method for producing medium and large caliber alloy steel seamless pipes by utilizing a radial forging technology, which comprises the following steps of: A. centrifugally casting a medium and large caliber hollow pipe blank through external refining molten steel; B. machining the internal and external surfaces of the medium and large caliber hollow pipe blank, fixedly connecting a carbon steel 'chuck material' at one end or both ends thereof and then carrying out quality inspection; C. heating and descaling the medium and large caliber hollow pipe blank; D. inserting a mandrel into the medium and large caliber hollow pipe blank and then leading into a radial forging machine for forging molding to manufacture a pipe of which the wall thickness, the diameter and the length meet requirements; and E. carrying out heat treatment, finishing and 'chuck materia' cutting for the pipe to manufacture a qualified finished product pipe. A technologic relation is established between high-quality centrifugal casting and radial forging with more ideal deforming state and tiny temperature drop by the method for the first time, thereby forming a new short-flow production process which has the advantages of energy saving, consumption reduction, high quality and economical efficiency and is used for producing alloy steel seamless pipes with large caliber, medium wall thickness and difficult deformation, and improving the product quality and the qualified rate; moreover, one end or both ends of the pipe blank is / are fixedly connected with the 'chuck material', thereby not only rapidly realizing stable deformation, but also reducing the remarkable difference of longitudinal temperature and dimensional precision of workpieces, lowering the consumption of an expensive alloy steel material and improving the yield of a finished product.

Description

technical field [0001] The invention relates to the manufacturing technology of seamless steel pipes, in particular to the manufacturing technology of alloy steel high-end seamless pipes with medium and large diameters, medium and thick walls, and difficult to process. Background technique [0002] Steel has good comprehensive performance, can bear the required load and have the required 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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B21J7/14
Inventor 刘怀文马晓梅王雅明金菊荪沈克林杜艳梅马忠良史军
Owner 北京蓝海科融新技术有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products