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Method for manufacturing thin-wall and ultra-long nickel-copper alloy pipes

A technology of nickel-copper alloy and manufacturing method, which is applied in the field of manufacturing thin-walled and ultra-long nickel-copper alloy pipes, can solve problems such as no relevant reports, difficulty in controlling roundness, and difficulty in straightening, etc., and achieve excellent performance, performance and stability , the effect of high tensile strength and yield strength

Active Publication Date: 2013-01-23
WESTERN TITANIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main difficulties in the processing of thin-walled pipes are easy to crack during rolling, difficult to control the roundness, easy to have pits during heat treatment, and difficult to straighten
Foreign countries generally use welded pipes for thin-walled and super-long pipes. At present, there are no relevant reports on thin-walled and super-long Monel 400 alloy seamless pipes at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1. Take nickel with a mass purity of not less than 99.9% and copper with a mass purity of not less than 99.9% as raw materials to prepare nickel-copper alloy ingots by smelting in a vacuum induction furnace; the mass percentage of nickel in the raw materials is 64%, The balance is copper;

[0028] Step 2. Heat the nickel-copper alloy ingot described in step 1 to 1050°C, and forge for 3 times to obtain a bar blank, and then mechanically process the bar blank to obtain a light with a diameter of Φ93mm and a surface roughness of Ra≤3.2μm. Baton;

[0029] Step 3. Use a cross-rolling piercing machine to roll the smooth rod described in step 2 into a tube blank with an outer diameter of Φ95mm and a wall thickness of 8mm under the condition of a piercing temperature of 1000°C, and then use a coreless car for machining Remove the oxide scale on the surface of the tube blank, and the amount of single-side turning is 1mm;

[0030] Step 4. Perform 2 passes of cold rolling on the t...

Embodiment 2

[0036] Step 1. Take nickel with a mass purity of not less than 99.9% and copper with a mass purity of not less than 99.9% as raw materials to prepare nickel-copper alloy ingots by smelting in a vacuum induction furnace; the mass percentage of nickel in the raw materials is 66%, The balance is copper;

[0037] Step 2. Heat the nickel-copper alloy ingot described in step 1 to 1150°C, and forge for 3 times to obtain a bar blank, and then mechanically process the bar blank to obtain a light with a diameter of Φ95mm and a surface roughness of Ra≤3.2μm. Baton;

[0038] Step 3. Use a cross-rolling piercing machine to roll the smooth rod described in step 2 into a tube blank with an outer diameter of Φ98mm and a wall thickness of 9mm under the condition of a piercing temperature of 1100°C, and then use a coreless car for machining Remove the oxide scale on the surface of the tube blank, and the amount of single-side turning is 1.5mm;

[0039] Step 4. Perform 3 passes of cold rolling on the...

Embodiment 3

[0045] Step 1. Take nickel with a mass purity of not less than 99.9% and copper with a mass purity of not less than 99.9% as raw materials to prepare nickel-copper alloy ingots by smelting in a vacuum induction furnace; the mass percentage of nickel in the raw materials is 65%, The balance is copper;

[0046] Step 2. Heat the nickel-copper alloy ingot described in step 1 to 1100°C, and then forge for 3 times to obtain a bar blank, and then mechanically process the bar blank to obtain a light with a diameter of Φ94mm and a surface roughness of Ra≤3.2μm. Baton;

[0047] Step 3. Using a cross-rolling piercing machine, the smooth rod described in step 2 is rolled into a tube blank with an outer diameter of Φ97mm and a wall thickness of 8.5mm under the condition of a piercing temperature of 1050℃, and then a coreless car is used for mechanical Process to remove the oxide scale on the surface of the tube blank, and the single-side turning amount is 1.2mm;

[0048] Step 4. Perform 2 passe...

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Abstract

The invention discloses a method for manufacturing thin-wall and ultra-long nickel-copper alloy pipes. The method comprises the following steps of: 1, smelting nickel and copper serving as raw materials in a vacuum induction furnace to prepare nickel-copper alloy ingots; 2, drawing and forging the nickel-copper alloy ingots into bar billets, and machining the bar billets into light bars; 3, rolling the light bars into pipe billets by adopting a cone mill, and removing scales on the surfaces of the pipe billets; 4, performing cold rolling machining; 5, sequentially cogging the cold rolled pipebillets, and performing crystallization and annealing treatment and boring treatment to obtain pipes; 6, continuously rolling the pipes, and performing annealing treatment and acid washing to obtain finished pipes; and 7, straightening the finished pipes, and thus obtaining the thin-wall and ultra-long nickel-copper alloy pipes with diameter-thickness ratio of 50 to 70 and length of over 15,000 millimeters. The finished nickel-copper alloy pipes machined with high deformation and cold-rolled by a continuous rolling production process have high tensile strength and yield strength and meet the plasticity requirement.

Description

Technical field [0001] The invention belongs to the technical field of nickel-copper alloy pipe manufacturing, and specifically relates to a method for manufacturing a thin-walled and ultra-long nickel-copper alloy pipe. Background technique [0002] Monel 400 alloy is a nickel-based alloy containing copper. This alloy has excellent corrosion resistance in hydrofluoric acid and fluorine gas media, and also has excellent corrosion resistance to hot concentrated lye, dry chlorine, seawater, and organic acids. . It not only has good room temperature and high temperature mechanical properties and corrosion resistance, but also has excellent cold and hot working process plasticity, formability and welding performance, and does not produce stress corrosion cracking. Monel 400 alloy is widely used in sea water exchangers, sulfuric acid and hydrochloric acid environments, crude oil distillation, nuclear industry uranium refining and isotopic separation with excellent comprehensive perfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
Inventor 杨亚社杨永福文周峰李刚董宏军南莉罗登超齐元昊王莎韦培席锦会舒滢杨建朝
Owner WESTERN TITANIUM TECH
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