CN106269967A

CN106269967A - A kind of method making invar bar

Info

Publication number: CN106269967A
Application number: CN201510302831.9A
Authority: CN
Inventors: 荆正伟
Original assignee: Danyang Kaixin Alloy Material Co Ltd
Current assignee: Danyang Kaixin Alloy Material Co Ltd
Priority date: 2015-06-06
Filing date: 2015-06-06
Publication date: 2017-01-04

Abstract

The present invention relates to a kind of method making invar bar, its comprise the steps: (1) use pure nickel plate, pure iron as raw material, through vacuum medium frequency induction furnace melting；(2) then use pouring technology under vacuum, obtain steel ingot；(3) by steel ingot hot rolling cogging, pole is rolled.Wherein, by lower cast steel ingot abrasive machine out by the pit of steel ingot, after sticking up skin reconditioning, it is heated to 1100-1200 DEG C, is incubated 0.8-1.5 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 rolling pole, 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 efficiency is higher.

Description

A kind of method making invar bar

Technical field

The method that the present invention relates to make invar bar, especially pours into a mould the new technology of 3 billet direct hot rolling invar bar-roll forging under vacuum.

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 tradition invar bar: the most domestic production for invar bar 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 rolling 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, reduce the competitiveness of product in market, simultaneously because operation is various, affect yield and production cycle, cause busy season invar market supply shortage.

Summary of the invention

The technical problem to be solved is to provide a kind of technique compared with the method making invar bar simple, that cost is relatively low and efficiency is higher.

In order to solve the problems referred to above, the invention provides a kind of method making invar bar: roll forging technique: invar steel ingot direct cogging hot rolling pole.

The concrete method making invar bar, comprises the steps:

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

(2) then use pouring technology under vacuum, obtain steel ingot；

(3) by steel ingot hot rolling cogging, pole is rolled.

Wherein, by lower cast steel ingot abrasive machine out by the pit of steel ingot, after sticking up skin reconditioning, it is heated to 1100-1200 DEG C, is incubated 0.8-1.5 hour, 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: the advantage of the method making invar bar of the present invention:

1) due to the fact that not through electroslag remelting, forge hot (relative to prior art, omit electroslag, the step of forging), so the cosmetic issue of square billet before needing not worry about hot rolling, before need not roll pole, 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 12-15 unit；

2) due to the fact that eliminate electroslag remelting, 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；nullPrior art uses 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 rolling 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 making invar bar of the present embodiment, comprises the steps:

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

2) use pouring technology under vacuum so as to get Ingot Surface Quality be greatly improved.

3) by steel ingot hot rolling cogging, pole is rolled.

Wherein, the size of the hole type design steel ingot according to hot rolling is major part 135mm, microcephaly 120mm, length is at the concentric reducer billet of about 500mm, lower cast steel ingot out only need to be with abrasive machine by the pit of steel ingot, stick up the simple reconditioning of skin once, then it is heated to 1105 DEG C through gas generator or gas furnace, it is incubated 1 hour, get final product the hot rolling size to required bar, then straightening, cutting strips off the skin and polishes the size of finished product, after this eliminating the highest link of this cost of forge hot 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 making invar bar of the present embodiment, 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 making invar bar of the present embodiment, there is following modification: described pure nickel plate, the mass ratio of pure iron are 0.45:1；Wherein, to lower cast Heating Steel Ingots out to 1150 DEG C, it is incubated 0.9 hour.

Vacuum medium frequency induction furnace melting, select Jinchuan board pure nickel plate, Taiyuan steel mill low-carbon (LC), the pure iron of low-sulfur phosphorus carry out the melting of invar as raw material, pour into the electrode bar needed for electroslag after melting and carry out electroslag (note: the processing price 5 yuan/KG of electroslag) again, add the material of electroslag through vacuum, no doubt gas content and the degree of purity of steel are all good than intermediate frequency adds electroslag.

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 making invar bar, it is characterised in that include, roll forging technique: invar steel ingot direct cogging hot rolling pole.

2. the method making invar bar, it is characterised in that include,

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

Then use pouring technology under vacuum, obtain steel ingot；

By steel ingot hot rolling cogging, roll pole.

The method of making invar bar the most according to claim 2, it is characterised in that by lower cast steel ingot abrasive machine out by the pit of steel ingot, after sticking up skin reconditioning, be heated to 1100-1200 DEG C, be incubated 0.8-1.5 hour, hot rolling can be carried out.

The method of making invar bar 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.