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A copper-nickel alloy seamless pipe and its manufacturing method

A technology of copper-nickel alloy and manufacturing method, which is applied in the field of seamless pipes, can solve problems such as difficult washing off of scale, high deformation resistance, and easy occurrence of cracks, and achieve the effects of ensuring inner surface quality, reducing corrosion, and improving quality

Active Publication Date: 2018-04-24
HUZHOU HUATE STAINLESS STEEL TUBES MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Problems that are prone to occur in production and processing: 1. Difficult to perforate, prone to cracks, and easy to peel on the surface; 2. Difficult to cold rolling, difficult to deform, and high deformation resistance; Rough, severe surface corrosion

Method used

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  • A copper-nickel alloy seamless pipe and its manufacturing method
  • A copper-nickel alloy seamless pipe and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A method for manufacturing a copper-nickel alloy seamless pipe, comprising the steps of:

[0048] Step 1, smelting. During smelting, an induction furnace is used for smelting, and ultrasonic stirring is used. The ultrasonic frequency is 40KHz, so that the nickel and copper are evenly mixed. Its chemical composition is calculated by weight percentage: Ni ≥ 63, Cu 28-34, Fe ≤ 2.5, Mn ≤ 2, C < 0.3, Si < 0.5, S < 0.024, and the balance is inevitable trace elements.

[0049] Step 2, electroslag remelting, an argon protection device is designed in the electroslag remelting pool, and argon protection is implemented for the electroslag remelting process.

[0050] Step 3, casting a circular tube blank.

[0051] Step 4: Heating the circular tube; the heating temperature is 915-955°C.

[0052] From the heating furnace used to heat the round tube blank in the step 4 to the piercer for piercing the circular tube blank in the step 5, a heat preservation channel for the circular tub...

Embodiment 2

[0062] A method for manufacturing a copper-nickel alloy seamless pipe, comprising the steps of:

[0063] Step 1, smelting. During smelting, an induction furnace is used for smelting, and ultrasonic stirring is used. The ultrasonic frequency is 40KHz, so that the nickel and copper are evenly mixed. Its chemical composition is calculated by weight percentage: Ni ≥ 63, Cu 28-34, Fe ≤ 2.5, Mn ≤ 2, C < 0.3, Si < 0.5, S < 0.024, and the balance is inevitable trace elements.

[0064] Step 2, electroslag remelting, an argon protection device is designed in the electroslag remelting pool, and argon protection is implemented for the electroslag remelting process.

[0065] Step 3, casting a circular tube blank.

[0066] Step 4: Heating the circular tube; the heating temperature is 915-955°C.

[0067] From the heating furnace used to heat the round tube blank in the step 4 to the piercer for piercing the circular tube blank in the step 5, a heat preservation channel for the circular tub...

Embodiment 3

[0077] A method for manufacturing a copper-nickel alloy seamless pipe, comprising the steps of:

[0078] Step 1, smelting. During smelting, an induction furnace is used for smelting, and ultrasonic stirring is used. The ultrasonic frequency is 40KHz, so that the nickel and copper are evenly mixed. Its chemical composition is calculated by weight percentage: Ni ≥ 63, Cu 28-34, Fe ≤ 2.5, Mn ≤ 2, C < 0.3, Si < 0.5, S < 0.024, and the balance is inevitable trace elements.

[0079] Step 2, electroslag remelting, an argon protection device is designed in the electroslag remelting pool, and argon protection is implemented for the electroslag remelting process.

[0080] Step 3, casting a circular tube blank.

[0081] Step 4: Heating the circular tube; the heating temperature is 915-955°C.

[0082] From the heating furnace used to heat the round tube blank in the step 4 to the piercer for piercing the circular tube blank in the step 5, a heat preservation channel for the circular tube ...

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Abstract

The invention discloses a copper-nickel alloy seamless tube and a manufacturing method. The copper-nickel alloy seamless tube comprises, by weight, more than 63% of Ni, 28%-34% of Cu, 0-2.5% of Fe, 0-2% of Mn, less than 3% of C, less than 0.5% of Si, less than 0.024% of S, and the balance inevitable trace elements. The manufacturing method includes the following steps of smelting, electroslag remelting, round pipe billet casting, round pipe billet heating, perforating, the first time of acid pickling, cold rolling, degreasing, thermal treatment, finishing and the second time of acid pickling. The manufactured copper-nickel alloy seamless tube is free of the appearance defects of pitting, scratches, cracks, peeling and the like, and the inner surface and the outer surface of the seamless tube are bright; according to the manufacturing method, the process is short, operation is simple and convenient, efficiency is high, the percent of pass is high, and cost is low.

Description

technical field [0001] The invention belongs to the technical field of seamless pipes, in particular to a copper-nickel alloy seamless pipe and a manufacturing method thereof. Background technique [0002] Copper-nickel alloy pipe (pipe fittings) is a kind of pipe fittings. It is made of copper and nickel alloy, so it is called copper-nickel alloy pipe fittings. At present, most seamless pipe enterprises use cold drawing or cold rolling process to manufacture seamless steel pipes. The main production process of cold-rolled (drawn) seamless steel pipes: billet preparation → pickling and lubrication → cold rolling (drawing) → heat treatment → straightening → finishing → inspection , the size of the cold-rolled seamless steel pipe is accurate, but in the cold-rolling process, due to the large amount of wall reduction and diameter reduction, the number of cold-rolling passes is small, the number of heat treatments is small, and the residual application force is large. After heat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03B21C37/06B21B25/00B21B45/02B21B25/04
CPCB21B25/00B21B25/04B21B45/0242B21B45/0245B21B45/0248B21B2045/026B21C37/06C22C19/03
Inventor 徐培玉沈勇
Owner HUZHOU HUATE STAINLESS STEEL TUBES MFG
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