A short-process production method for large-diameter thin-walled copper-nickel pipes

A production method and technology for white copper tubes, applied in the field of metal materials, can solve the problems of low yield, large investment, long process, etc., and achieve the effects of high yield, reduced equipment investment, and small investment.

Active Publication Date: 2017-08-08
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

[0029] Embodiment 1: The size is Φ220 * 5mm BFe10-1-1 cupronickel (soft state) straight tube production method

[0030](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.

[0031] (2) The tube blank prepared in step (1) is directly drawn for 6 passes, wherein 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 is req...

Embodiment 2

[0033] Embodiment 2: The size is Φ160 * 3mm BFe10-1-1 cupronickel (soft state) straight tube production method

[0034] (1) The BFe10-1-1 white copper tube billet of Φ170×6mm 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 1000L / h, the secondary cooling water flow rate of spray water is 600L / h, and the traction speed is 100mm / min.

[0035] (2) The tube blank prepared in step (1) is directly drawn for 5 passes, wherein 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...

Embodiment 3

[0037] Embodiment 3: The size is Φ180 * 4mm BFe30-1-1 cupronickel (soft state) straight tube production method

[0038] (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.

[0039] (2) The tube blank prepared in step (1) is directly drawn for 6 passes, wherein 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 is req...

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Abstract

The invention discloses a short-process production method of a large-diameter thin-walled white copper pipe, which belongs to the technical field of metal materials. Aiming at the traditional "semi-continuous casting solid ingot-piercing extrusion-pickling-drawing-annealing" process to produce large-diameter thin-walled copper-nickel pipes requires more than 5,000 tons of large-scale extrusion equipment, and the yield is low and the cost is high. The present invention proposes a method of horizontal continuous casting of large-sized white copper pipe blanks using hot and cold combined molds, and then adopts diameter expansion or / and diameter reduction drawing to process and form large-diameter thin-walled white copper pipes, which has the advantages of small equipment investment, short process flow, No pickling and other advantages. The outer diameter of the horizontal continuous casting tube blank is 110~350mm, the wall thickness is 5~30mm, the extension coefficient of the drawing pass for expanding diameter is 0.80~1.0, the extension coefficient for drawing pass for reducing diameter is 1.1~1.5, and the outer diameter of the processed product is 100~ 320mm, wall thickness 3~20mm.

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) generally ranges from 50 to 310 mm in outer diameter and 3 to 10 mm in wall thickness, and is an important structural component 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 increa...

Claims

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Application Information

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Patent Type & Authority Patents(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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