Manufacturing method of ultra-large-diameter thick-wall seamless steel pipe

A technology of seamless steel pipe and ultra-large diameter, which is applied in the field of seamless steel pipe preparation, and can solve the problems of difficult forging of pipe fittings and difficulty in reaming holes

Pending Publication Date: 2022-03-15
INNER MONGOLIA NORTH HEAVY INDS GROUP
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for manufacturing super-large-diameter thick-walled seamless steel pipes, which uses extr...

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The following description illustrates specific embodiments of the invention sufficiently to enable those skilled in the art to practice and reproduce it.

[0018] A method for manufacturing a super-large diameter thick-walled seamless steel pipe, the specific steps are as follows:

[0019] Step 1: Before forging and forming, continue to process the billet through billet making and extrusion;

[0020] Before forging, the steel ingot is cut into a riser to make a billet, the surface quality is processed, the billet is processed to meet the process size, and it is fully lubricated. After billet making, the end face of the billet is flat, without large cracks and obvious defects on the surface, and the billet after processing is regular and meets the size required by the process. After extrusion, the upper and lower end surfaces of the billet are relatively flat, there is no horseshoe shape at the outlet end, the surface is evenly lubricated and there are no obvious defect...

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

No PUM Login to view more

Abstract

The invention discloses a method for manufacturing an ultra-large-diameter thick-wall seamless steel pipe, which comprises the following steps of: before forging and forming, continuously processing a blank through blank manufacturing and extruding procedures; forging and chambering are conducted after the blank is heated, two times of mandril sleeving and shaping are adopted in the forging and chambering process, heat treatment is conducted after forging and chambering, and the large-caliber thick-wall seamless steel pipe is prepared. The extrusion-forging combined forming mode is adopted, and the problems that the ultra-large-diameter thick-wall pipe fitting is difficult to forge thoroughly and the chambering difficulty is large are solved.

Description

technical field [0001] The invention belongs to the preparation technology of seamless steel pipes, in particular to a method for manufacturing super-large diameter thick-wall seamless steel pipes. Background technique [0002] Conventional seamless steel pipes are generally produced by forging or extrusion. Currently, the specifications of seamless steel pipes that can be produced range from 200 to 1200mm, and the pass rate of flaw detection for steel pipes with a diameter of more than one meter is generally about 50%. [0003] According to the previous process route, such a large-diameter seamless steel pipe needs to be forged, the total weight of the billet and the mandrel exceeds the load of the manipulator, and the press cannot forge the billet through, and the performance is difficult to meet the technical requirements. In hollow forging, the blank needs to be punched after upsetting, the diameter of the punch is small, and the hole is easy to be punched off; the punch...

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
IPC IPC(8): B21K1/14B21J9/04B21J1/04B21J1/06B21J5/10B21J3/00
CPCB21K1/14B21J9/04B21J1/04B21J1/06B21J5/10B21J3/00
Inventor 麻庆文姚建清王交其王燕玲秦瑞廷杜红强王玉宝李挺郭文斌
Owner INNER MONGOLIA NORTH HEAVY INDS GROUP
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
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap