CN106269867A

CN106269867A - The ingot hot rolling of a kind of invar side that cost is relatively low and efficiency is higher makes the method for pipe

Info

Publication number: CN106269867A
Application number: CN201510307802.1A
Authority: CN
Inventors: 荆正伟
Original assignee: Danyang Kaixin Alloy Material Co Ltd
Current assignee: Danyang Kaixin Alloy Material Co Ltd
Priority date: 2015-06-08
Filing date: 2015-06-08
Publication date: 2017-01-04

Abstract

The present invention relates to the method that a kind of invar side that cost is relatively low and efficiency is higher ingot hot rolling makes pipe, its comprise the steps: (1) use pure nickel plate, pure iron as raw material, through vacuum medium frequency induction furnace melting；(2) then use under vacuum and pour into a mould 200kg side's ingot technique, obtain 200kg side's ingot；(3) by the direct hot rolling cogging of square ingot of bet, the bar needed for hot piercing directly it is rolled into.Wherein, by lower cast square ingot abrasive machine out by the pit of steel ingot, after sticking up skin reconditioning, it is heated to 1050-1100 DEG C, is incubated 0.5-1.1 hour, hot rolling can be carried out.Described pure nickel plate, the mass ratio of pure iron are 0.45:1 to 0.60:1.Due to the fact that not through forge hot, so the cosmetic issue of square billet before needing not worry about hot rolling, it is not necessary to before hot rolling unit rod, the square billet to steel rolling carries out a series of processed, such as plane milling square billet, reconditioning square billet, so the technique of the present invention compared with simple, cost is relatively low and production efficiency is higher.

Description

The ingot hot rolling of a kind of invar side that cost is relatively low and efficiency is higher makes the method for pipe

Technical field

The present invention relates to the method that the ingot hot rolling of invar side makes pipe.

Background technology

Invar belongs to iron-based Langaloy, usually contain the Ni of 32-36wt%, possibly together with a small amount of S, P, the elements such as C, remaining is the Fe of about 60wt%, owing to nickel is for expanding austenite element, therefore below room temperature is down in the nickelic phase transformation making austenite transfer martensite to,-100 DEG C～-120 DEG C, thus after annealing, invar is in the following certain temperature range of room temperature and room temperature, it is respectively provided with the austenite structure of face centered lattice structure, also it is that nickel is dissolved in γ-Fe the solid solution formed, thus invar to have the coefficient of expansion little, intensity, hardness is the highest, heat conductivity is low, plasticity, the excellent performances such as toughness is high.

The purposes of invar: to have the coefficient of expansion little due to invar, intensity, hardness are the highest, heat conductivity is low, the excellent performances such as plasticity, toughness are high, so invar is suitable for making the CRP parts tempering mould having the precision component membrane-type frame of strict demand, shadow mask, aircraft industry to temperature deformation, artificial satellite less than-200 DEG C and guided missile electronic control unit framework, the auxiliary electron pipe in laser control apparatus electromagnetism camera lens.The production of liquefied gas, store and transport；Operating temperature is less than the measurement of less than+200 DEG C and controls instrument, such as temperature-adjusting device. screwed union lining, bimetallic and the temperature control bimetallic between metal and other materials.Developing rapidly of current 4G network, invar have also been obtained on 4G network and is widely applied such as wave filter, and resonant rod, waveguide etc. is required for using the material of invar.The invar extensively application in each field causes the demand of invar day by day to increase, and occurs that this situation needs to carry out volume production.

The production technology of the tradition cold rolling pipe of invar: the production of the most domestic pipe cold rolling for invar uses intermediate frequency furnace melting, electroslag remelting, so may result in gaseous impurity content high, forge hot is carried out after melting, reconditioning square billet, plane milling square billet, then hot-rolled tube billet is carried out, so square billet material after forge hot is very easy to crackle occur, oxide skin, pit, burr, the defects such as peeling, in order to eliminate the defect that these forge hots bring, need to exert square billet is carried out the operation of a series of milling mill, so as elimination defect, but while do so, too increase production cost and the nonphysical wear of invar pipe, cause the rise of the production cost of product, reduce the competitiveness of product in market, simultaneously because operation is various, affect yield and production cycle, cause busy season invar pipe market supply shortage.

Summary of the invention

The technical problem to be solved is to provide a kind of method that technique makes pipe compared with simple, cost is relatively low and efficiency is higher invar side's ingot hot rolling.

In order to solve the problems referred to above, the method that the invention provides a kind of invar side ingot hot rolling making pipe: roll forging hot rolling technology: the invar bet side direct cogging of ingot, direct hot rolling invar pipe.

The method that concrete invar side's ingot hot rolling makes pipe, comprises the steps:

(1) employing pure nickel plate, pure iron is as raw material, cleaned, dried, through vacuum medium frequency induction furnace melting；

(2) then use cast side's ingot technique under vacuum, obtain invar side's shape steel ingot；

(3) by invar side's shape steel ingot hot rolling cogging, the direct cold rolling pipe of hot rolling invar.

Wherein, by lower cast steel ingot abrasive machine out by the pit of steel ingot, after sticking up skin reconditioning, it is heated to 1050-1100 DEG C, is incubated 0.5-1.0 hour, cogging hot rolling can be carried out.

Further, described pure nickel plate, the mass ratio of pure iron are 0.45:1 to 0.6:1.

The technique effect of the present invention:

1) due to the fact that not through forge hot (i.e. relative to prior art, omit the step of electroslag forging), so the cosmetic issue of square billet before needing not worry about hot rolling, before need not hot rolling invar pipe, the square billet to steel rolling carries out a series of processed, such as plane milling square billet, reconditioning square billet, so can be greatly saved the manufacture of invar and the cost of processing, and per kilogram about can be with cost-effective 8-10 unit；

2) due to the fact that eliminate forge hot and milling machine processing intermediate link, add the lumber recovery of the 10%-15% of product on the contrary, decrease the nonphysical wear of 3-4%；

3) due to the fact that there is no forge hot, reconditioning, milling square billet production link, the production cycle reduces significantly, and production efficiency is greatly improved, and can meet the demand of invar follow-up high-volume volume production；nullIn prior art，Use intermediate frequency furnace melting，Electroslag remelting,It is higher than vacuum metling that (note: the processing price 5 yuan/Kg of electroslag) so may result in gas content，Forge hot forge hot (note: the processing price 5 yuan/Kg of forge hot) is carried out after melting electroslag，Reconditioning square billet，Plane milling square billet (note: the processing charges 3-4 unit/kg of square billet milling)，Then hot-rolled tube billet is carried out，So square billet material after forge hot is very easy to crackle occur，Oxide skin、Pit、Burr，The defects such as peeling，In order to eliminate the defect that these forge hots bring，Need to exert square billet is carried out the operation of a series of milling mill，So as elimination defect，But while do so，Too increase production cost and the nonphysical wear of invar，Cause the rise of the production cost of product，The lumber recovery digging milling square billet after general forging is 85-90%，Nonphysical wear is 3-4%，Production and processing expense be 3-4 unit/kilogram，Further need exist for pickling inspection，The crackle produced by forging，Oxide skin、Pit、Burr，The defects such as peeling，Remove clean,Take a lot of work expensive.

Detailed description of the invention

Embodiment 1

The method that invar side's ingot hot rolling of the present embodiment makes pipe, comprises the steps:

1) vacuum medium frequency induction furnace melting: select Jinchuan board pure nickel plate, Taiyuan steel mill low-carbon (LC), low-sulfur phosphorus pure iron cleaned as raw material, dried, carry out the melting of invar, the aspect such as such gaseous impurity greatly reduces and adds the plasticity of invar, toughness, extends the service life of invar.Described pure nickel plate, the mass ratio of pure iron are 0.5:1.

2) use pour into a mould 200Kg side's ingot technique under vacuum so as to get square shape invar side ingot surface quality be greatly improved.

3) invar side's shape steel ingot is carried out hot rolling cogging, the cold rolling pipe of hot rolling invar.

Wherein, the size of the hole type design steel ingot according to hot rolling is major part 180x180xmm, microcephaly 160x160mm, length is at the concentric reducer side of about 1200mm ingot, lower cast square ingot out only need to be with abrasive machine by the surface pit of square ingot, stick up the simple reconditioning of skin once, then it is heated to 1100 DEG C through gas generator or gas furnace, it is incubated 1 hour, get final product the hot rolling size to the cold rolling pipe of required invar, then car light is to the size of required pipe blank, after this eliminating electroslag and the highest link of forge hot the two cost and avoiding forge hot, there is crackle in square billet surface, oxide skin, pit, burr, the defects such as peeling, thus eliminate a series of high cost, highly difficult is follow-up to square billet milling, plane, the process of mill.

Embodiment 2

On the basis of embodiment 1, the method that invar side's ingot hot rolling of the present embodiment makes pipe, there is following modification: described pure nickel plate, the mass ratio of pure iron are 0.59:1.To lower cast Heating Steel Ingots out to 1110 DEG C, it is incubated 1.1 hours.

Embodiment 3

On the basis of embodiment 1, the method that invar side's ingot hot rolling of the present embodiment makes pipe, there is following modification: described pure nickel plate, the mass ratio of pure iron are 0.45:1, to lower cast Heating Steel Ingots out to 1150 DEG C, be incubated 0.9 hour.

The above, be only presently preferred embodiments of the present invention, is not the restriction that the present invention makees other form, and any those skilled in the art are changed possibly also with the technology contents of the disclosure above or are modified as the Equivalent embodiments of equivalent variations.But every without departing from technical solution of the present invention content, any simple modification, equivalent variations and remodeling above example made according to the technical spirit of the present invention, still fall within the protection domain of technical solution of the present invention.

Claims

1. the method that invar side's ingot hot rolling makes pipe, it is characterised in that include,

Employing pure nickel plate, pure iron are as raw material, cleaned, dried, through vacuum medium frequency induction furnace melting；

Then use cast side's ingot technique under vacuum, obtain the square ingot of bet；

By square ingot hot rolling cogging, the pipe needed for direct hot rolling hot piercing.

Method the most according to claim 1, it is characterised in that by lower cast square ingot abrasive machine out by the pit of steel ingot, after sticking up skin reconditioning, be heated to 1050-1100 DEG C, be incubated 0.5-1.1 hour, the pipe needed for hot rolling hot piercing can be carried out.

Method the most according to claim 2, it is characterised in that described pure nickel plate, the mass ratio of pure iron are 0.45:1 to 0.6:1.