CN104043943A

CN104043943A - Manufacturing process of cupronickel pipe

Info

Publication number: CN104043943A
Application number: CN201310075851.8A
Authority: CN
Inventors: 高玉树
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-03-11
Filing date: 2013-03-11
Publication date: 2014-09-17

Abstract

The invention provides a manufacturing process of a cupronickel pipe. The process comprises the steps: mixing a metal copper raw material, a nickel raw material and other trace alloy elements according to the ratio requirement of the cupronickel material, continuously smelting the mixture in a smelting furnace, continuously feeding the molten alloy liquid into a heat preserving furnace through a connection through hole, continuously upwards casting the molten alloy liquid entering the heat preserving furnace to form a copper-nickel alloy pipe blank after the molten alloy liquid passes through a continuous casting crystallizer, clamping and drawing the continuously-cast alloy pipe blank through the pressure of pair rolls on a vertical casting and drawing machine stander, continuously drawing out the pipe blank upwards , cutting off the drawn-out pipe blank according to a given length, primarily straightening the pipe blank, and drawing the straightened pipe blank in one step or multiple steps to form a finished product after the straightened pipe blank is rolled in one step through a primary cold roll mill and annealed in one step. According to the process, the traditional extruding production process is simplified to a novel production process of one-step continuous casting, one-step continuous cold rolling and one-step or multi-step drawing process. The process is an advanced process which is free from smoke and dust pollution and capable of improving the rate of finished products.

Description

A kind of method of manufacturing technology of White Copper Tubes

Technical field:

The present invention relates to a kind of method of manufacturing technology of White Copper Tubes, relate to specifically the casting of a kind of one-time continuous, one-time continuous cold rolling, once or the manufacturing process method of a little passes of drawing production White Copper Tubes.

Background technology:

Current production White Copper Tubes, home and abroad all adopts high-power extruder extruding to produce, and its technical process is: batching-melting-ingot casting---the drawing-finished product of ingot casting post bake-extruding-rolling (or direct drawing)-repeatedly anneal-repeatedly.Its shortcoming is that (1) lumber recovery is low, and nearly all process of factory production lumber recovery is only 40%-50%, the serious development that is restricting White Copper Tubes industry; (2) scale of investment is large.The built-in regular White Copper Tubes manufacturing enterprise of state needs more than 100,000,000 yuan at least at present; (3) seriously polluted, the extrusion process of domestic and international any tubing is all at the cost of the environment, and in production process, smoke contamination is difficult to administer; (4) energy consumption is high, single ton of White Copper Tubes productive power of general enterprises reaches 5000 kilowatt hours, has caused consuming excessively of electric energy in production cost; (5) unstable, the inclined to one side wall of quality of tube blank steel, the defect such as be mingled with and be difficult to solve.

Summary of the invention:

Object of the present invention, be to provide a kind of method of manufacturing technology of White Copper Tubes, put it briefly be exactly through one-time continuous casting, one-time continuous cold rolling, once or the process of the drawing production White Copper Tubes of a little passage, to solve the deficiency of extrusion process, the advantage such as the method yield rate is high, little power consumption, production efficiency are high, there is no or only have slight smoke contamination, labour intensity is low.

The object of the present invention is achieved like this: metallic copper raw material and nickel raw material and other trace alloying element carry out continuous smelting by copper-nickel alloy material requirement proportioning in smelting furnace, the connecting through hole that alloy molten solution after continuous smelting arranges by bottom continues to enter holding furnace, the alloy molten solution that enters holding furnace reaches the above degree of depth of 150mm by vertically fixing, be equipped with that the continuous cast crystallizer of mould is backward above pulls out alloy pipe stock through draw bar traction, draw bar and the follow-up alloy pipe stock that pulls straight casting crystallizer are that drive pipe pausing-mode that traction is pulled out of the pressure clamping of drawing spill pair roller in machine frame through vertical casting is upwards pulled out repeatedly, after being cut off by certain length, the pipe of pulling out carries out preliminary straightening, by the pipe after straightening through the rolling of once cold rolling machine, once anneal by once or a little passes of drawing to finished size.

The continuous smelting and while being incubated in holding furnace in smelting furnace of copper-nickel alloy copper Ni substrate alloy melt, the melting of melt, holding temperature does not coexist within the scope of 1000～1600 ℃ and adjusts according to the White Copper Tubes trade mark, continuous smelting furnace bath surface covers the thick charcoal layer of 50～200mm, the thin ashes that thermal insulation furnace melt surface coverage 100～200mm is thick or graphite scale, the pressure of continuous crystalizer cooling water is 0.2～0.8MPa, temperature remains between 10 ℃～80 ℃, pipe continuous casting speed is 10mm～500mm/ minute, it is 0.5mm～10mm that length is pulled out in the pause-traction of the every joint of pipe, pipe is when through pausing-drawing, repetitive mode is pulled out crystallizer repeatedly, pause frequency is 20～200 beats/min, the White Copper Tubes pipe diameter that continuous casting pulls out is 25mm～120mm, wall thickness 2.5mm～25mm, pipe on demand length cuts off, pipe after cutting off through straightener straightening by cold-rolling mill continuous cold rolling, after 10%～80% deflection, cut off on demand, pipe after cut-out becomes trimmed size through annealing with drawing procedure.

The method of this technique is because a, drawing cold rolling with one-time continuous continuous casting, one-time continuous or the simple and easy operation of a little passes of drawing have replaced the melting-ingot casting of traditional handicraft kind---the drawing process process of ingot casting post bake-extruding-rolling (or direct drawing)-repeatedly annealing-repeatedly, thereby greatly simplified technological process, with short production cycle, equipment investment is few, energy consumption consume low, metal loss is little, yield rate is high, almost pollution-free, labour intensity is low, production cost is low, has significant economic benefit.

The specific embodiment

Below by embodiment, the invention will be further described.

Embodiment 1. produces Φ 25 * 0.75 * 8000BFe10-1-1 White Copper Tubes.Constantly by cathode copper and sheet nickel and appropriate pure iron piece, electrolytic manganese piece adds melting in continuous melting stove, smelting furnace temperature is controlled at 1200 ℃ of left and right, in continuous smelting furnace surface coverage, guarantee the thick charcoal layer of 80～150mm, the BFe10-1-1 copper-nickel alloy material that alloy melt after melting chemical examination proportioning continues to reach GB CB/T5231-2001 regulation requires: i.e. Ni+Co/9.0～11.0%, Fe/1.0～1.5%, Mn/0.5～1.0%, impurity content is no more than 0.7%, all the other are Cu, the copper-nickel alloy alloy melt that reaches qualified composition enters holding furnace insulation through interface channel, then enter continuous crystalizer and carry out casting crystalline, continuous crystalizer cooling water pressure is controlled between 0.2～0.8MPa, after the continuous crystallization of copper Ni substrate copper-nickel alloy alloy melt, the pair roller that is drawn machine by vertical casting pushes the copper-nickel alloy pipe that upwards pulls straight Φ 45 * 3.5, the speed of pulling out is 110mm/min, it is 6mm that the every joint of pipe is pulled out length, pipe is pulled out crystallizer through pause-traction repetitive process, pause frequency is 60 beats/min, the copper pipe pipe sawing that continuous casting is gone out becomes 5 meters to be one, by pipe straightening on straightener, by cold-rolling mill rolling, be the semi-finished product of Φ 28 * 1, the semi-finished product of Φ 28 * 1 are softened to stress relief annealing, semi-finished product after annealing carry out descale pickling, after pickling semi-finished product on drawbench, be once drawn into Φ 25 * 0.75 production tubes, then straightening and abscinding is leveled warehouse-in after becoming 8000mm.

Embodiment 2. produces Φ 40 * 1.5 * 6000B30 White Copper Tubes.Constantly by cathode copper and sheet nickel and appropriate pure iron piece, electrolytic manganese piece adds melting in continuous melting stove, smelting furnace temperature is controlled at 1350 ℃ of left and right, in continuous smelting furnace surface coverage, guarantee the thick charcoal layer of 80～150mm, the B30 copper-nickel alloy material that alloy melt after melting chemical examination proportioning continues to reach GB CB/T5231-2001 regulation requires: i.e. Ni+Co/29～33%, Fe/0.9%, Mn/1.2%, all the other are Cu, the copper-nickel alloy alloy melt that reaches qualified composition enters holding furnace insulation through interface channel, then enter continuous crystalizer and carry out casting crystalline, continuous crystalizer cooling water pressure is controlled between 0.2～0.8MPa, the pair roller extruding of drawing machine by vertical casting after the continuous crystallization of copper Ni substrate copper-nickel alloy alloy melt upwards pulls straight the copper-nickel alloy pipe of Φ 70 * 4, the speed of pulling out is 80mm/min, it is 5mm that the every joint of pipe is pulled out length, pipe is through pausing, traction repetitive process is pulled out crystallizer, pause frequency is 60 beats/min, the copper pipe pipe sawing that continuous casting is gone out becomes 5 meters to be one, by pipe straightening on straightener, by cold-rolling mill rolling, be the semi-finished product of Φ 45 * 1.6, the semi-finished product of Φ 45 * 1.6 are carried out to protective atmosphere annealing, after annealing semi-finished product on drawbench, be once drawn into Φ 40 * 1.5 production tubes, then straightening and abscinding is leveled warehouse-in after becoming 6000mm.

Claims

1. the method for manufacturing technology of a White Copper Tubes, it is characterized in that metallic copper raw material and nickel raw material and other trace alloying element carry out continuous smelting by copper-nickel alloy material requirement proportioning in smelting furnace, the connecting through hole that alloy molten solution after continuous smelting arranges by bottom continues to enter holding furnace, the alloy molten solution that enters holding furnace reaches the above degree of depth of 150mm by vertically fixing, be equipped with after the continuous cast crystallizer of mould, upwards through draw bar traction, pull out alloy pipe stock, draw bar and the follow-up alloy pipe stock that pulls straight casting crystallizer are that drive pipe pausing-mode that traction is pulled out of the pressure clamping of drawing spill pair roller in machine frame through vertical casting is upwards pulled out repeatedly, after being cut off by certain length, the pipe of pulling out carries out preliminary straightening, by the pipe after straightening through the rolling of once cold rolling machine, once anneal by once or a little passes of drawing to finished size.

2. method of manufacturing technology according to claim 1, is characterized in that: the continuous smelting temperature of copper-nickel alloy corronil and continuously holding temperature are 1000 ℃～1600 ℃.

3. method of manufacturing technology according to claim 1, is characterized in that: smelting furnace adds surface coverage in raw material and fusion process to keep the thick charcoal layer of 50～200mm at alloy molten solution.

4. method of manufacturing technology according to claim 1, is characterized in that: the thin ashes that thermal insulation furnace melt surface coverage 50～150mm is thick or graphite scale.

5. method of manufacturing technology according to claim 1, is characterized in that: the copper-nickel alloy pipe diameter that continuous casting is produced is that 25mm～120mm, wall thickness are 2.5mm～25mm.

6. method of manufacturing technology according to claim 1, is characterized in that: mould is graphite material.

7. method of manufacturing technology according to claim 1, it is characterized in that: copper-nickel alloy pipe is pulled out the repetitive operation repeatedly that the process of crystallizer is pause-traction through traction, action repetition rate is 20～200 beats/min, it is 0.5mm～10mm that pipe length is pulled out in pause-traction of single, and pulling out pipe speed is 10mm～500mm/ minute.

8. method of manufacturing technology according to claim 1, is characterized in that: casting crystallizer length is 0.5 meter～1.5 meters.

9. method of manufacturing technology according to claim 1, is characterized in that: to the traction mode of pulling out of draw bar and pipe, be that the clamping of twin shaft spill pair roller mechanical type pressure upwards drives.

10. method of manufacturing technology according to claim 1, is characterized in that: in continuous cast crystallizer, the pressure of cooling circulating water is 0.2～0.8MPa, and temperature is 5 ℃～85 ℃.

11. method of manufacturing technology according to claim 1, is characterized in that: pipe is 10%～80% through rolling reduction of cold-rolling mill.