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Large-diameter thin-wall cupronickel tube short process production method

A production method and white copper tube technology, applied in the field of metal materials, can solve the problems of low yield, high cost, and large investment, and achieve the effects of high yield, low production cost, and reduced equipment investment

Active Publication Date: 2016-02-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a large-diameter thin-walled copper-nickel pipe with the characteristics of small investment, high yield and low cost in view of the problems of large investment, long process, low yield and high cost in the traditional production process of large-diameter thin-walled copper-nickel pipes. Pipe short process production method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Production method of white copper (soft) straight tube with a size of Φ220×5mmBFe10-1-1

[0033](1) The BFe10-1-1 white copper tube billet of Φ230×10mm is prepared by the horizontal continuous casting process of the hot-cold combined mold. The melting temperature of the copper liquid is 1250°C, the temperature of the hot mold (mold heating section) is 1200°C, and it is cooled once. The water flow rate is 1200L / h, the secondary cooling water flow rate of spray water is 1000L / h, and the traction speed is 80mm / min.

[0034] (2) The tube blank prepared in step (1) is directly subjected to 6-pass drawing, in which the 1st and 2nd passes are diameter-expanding drawing, and the 3rd, 4th, 5th, and 6th passes are diameter-reducing drawing. The elongation coefficients of the 1st and 2nd passes were 0.98 and 0.98, respectively, and the elongation coefficients of the 3rd, 4th, 5th, and 6th passes were 1.24, 1.22, 1.22, and 1.18, respectively. No intermediate annealing ...

Embodiment 2

[0036] Example 2: The production method of white copper (soft) straight tube with a size of Φ160×3mmBFe10-1-1

[0037] (1) The BFe10-1-1 white copper tube billet of Φ170×6mm is prepared by the horizontal continuous casting process of the combined hot and cold casting mold. The melting temperature of the copper liquid is 1250°C, and the temperature of the hot mold (mold heating section) is 1200°C. The water flow rate is 1000L / h, the secondary cooling water flow rate of spray water is 600L / h, and the traction speed is 100mm / min.

[0038] (2) The tube blank prepared in step (1) is directly drawn for 5 passes, in which the 1st and 2nd passes are diameter-expanding drawing, and the 3rd, 4th, and 5th passes are diameter-reducing drawing. The elongation coefficients of the 1st and 2nd passes were 0.98 and 0.97, respectively, and the elongation coefficients of the 3rd, 4th, and 5th passes were 1.30, 1.30, and 1.28, respectively. No intermediate annealing is required during the draw...

Embodiment 3

[0040] Example 3: Production method of white copper (soft) straight tube with a size of Φ180×4mmBFe30-1-1

[0041] (1) The BFe30-1-1 white copper tube billet of Φ190×8mm is prepared by the horizontal continuous casting process of the hot-cold combined mold. The melting temperature of the copper liquid is 1300°C, the temperature of the hot mold (mold heating section) is 1250°C, and it is cooled once. The water flow rate is 1200L / h, the secondary cooling water flow rate of spray water is 800L / h, and the traction speed is 100mm / min.

[0042] (2) The tube blank prepared in step (1) is directly subjected to 6-pass drawing, in which the 1st and 2nd passes are diameter-expanding drawing, and the 3rd, 4th, 5th, and 6th passes are diameter-reducing drawing. The elongation coefficients of the 1st and 2nd passes were 0.96 and 0.96, respectively, and the elongation coefficients of the 3rd, 4th, 5th, and 6th passes were 1.22, 1.22, 1.23, and 1.21, respectively. No intermediate annealing...

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Abstract

The invention discloses a large-diameter thin-wall cupronickel tube short process production method and belongs to the technical field of metal materials. Specific to the problems that large-scale extrusion equipment up to 5000 tons is needed to produce large-diameter thin-wall cupronickel tubes through a traditional technique of semi-continuous casting solid ingot casting, punching, extruding, acid pickling, drawing and annealing, the finished product rate is low and the cost is high, the invention provides a method for producing the large-diameter thin-wall cupronickel tubes. Hot and cold combination casting horizontal continuous casting is adopted to producing large-size cupronickel tube blanks, and then a hole enlargement or / and hole shrinkage drawing is adopted to machining and forming the large-diameter thin-wall cupronickel tubes. The method has the advantages of being small in equipment investment, short in technical process, free of acid pickling and the like. The outer diameter of horizontal continuous casting tube blanks is 110-350 mm, the wall thickness is 5-30 mm, the elongation coefficient of hole enlargement drawing pass is 0.80-1.0, and the elongation coefficient of hole shrinkage drawing pass is 1.1-1.5; the outer diameter of machined products is 100-320 mm, and the wall thickness is 3-20 mm.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a short-process production method of a large-diameter thin-walled white copper pipe. Background technique [0002] Cupronickel has high strength, good thermal conductivity and corrosion resistance, and is widely used in heat exchange and seawater pipelines in thermal power generation, ships, seawater desalination and other fields. Among them, the size range of pipes for seawater pipelines (including pipelines, flanges, valves, and bellows) is generally 50-310mm in outer diameter and 3-10mm in wall thickness. They are important structural components in the fields of seawater desalination and ships [Zhang Wenyu, Current status and trends of marine piping materials, New Material Industry, 2011, No.2, p.62~65]. With the rapid development of my country's seawater desalination, shipbuilding and other marine industries, the demand for white copper pipes is increasing rapidly. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06
Inventor 姜雁斌刘新华谢建新毛晓东
Owner UNIV OF SCI & TECH BEIJING
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