CN1131702A

CN1131702A - Iron-nickel alloy having low coefficient of expansion

Info

Publication number: CN1131702A
Application number: CN95119756A
Authority: CN
Inventors: J·保德里; M·法拉尔; J·F·逖尔斯
Original assignee: Imphy SA
Current assignee: Aperam Stainless Precision SAS
Priority date: 1994-11-23
Filing date: 1995-11-22
Publication date: 1996-09-25
Anticipated expiration: 2015-11-22
Also published as: PL311448A1; KR960017884A; FR2727131A1; DE69517575D1; DE69517575T2; EP0713923B1; JPH08209306A; US20010045246A1; KR100227354B1; EP0713923A1; PL180440B1; CN1044825C; FR2727131B1; DK0713923T3

Abstract

The invention relates to iron/ nickel alloy with low expansion coefficient, the chemical compositions (calculated by weight) of which contains 35.5-37 percent of nickel, less than 0.1 percent of manganese, 0.03 percent to 0.15 percent of silicon, 0.0001 percent to 0.002 percent of calcium, 0.0001 percent to 0.002 percent of magnesium, less than 0.005 percent of aluminium, less than 0.001 percent of sulphur, less than 0.01 percent of oxygen, less than 0.005 percent of nitrogen and less than 0.003 percent of phosphor. And the compositions also meet the following relation that S is less than or equal to 0.02 times Mn plus 0.8 times Ca plus 0.6 times Mg.

Description

Low-expansion Fe-Ni alloys

The present invention relates to a kind of low-expansion iron/nickel alloy that has.

It is well-known that nickeliferous (by weight) iron/nickel alloy between 35% and 40% has the low coefficient of expansion.

Except nickel and iron, these alloys generally contain the impurity that is produced by fusion process, as sulphur, phosphorus, oxygen, nitrogen and carbon.They can also contain such as elements such as cobalt, chromium, copper, molybdenum, vanadium, niobium and silicon, and these elements are specially to add for the mechanical property of regulating alloy.But because the existence of impurity, these alloys are difficult to by rolling or forging and thermal distortion.

In order to improve thermal distortion, add and surpass 0.2% manganese.Yet a shortcoming of this element is exactly the coefficient of expansion that has obviously improved alloy.

In U.S. Pat 2050387, the method that a kind of manufacturing has the iron/nickel alloy of the forge hot that low-expansion coefficient becomes reconciled has been proposed, wherein in hydrogen, be higher than under 1150 ℃ of conditions the annealing high pure raw material, casting and solidifying in hydrogen atmosphere then with molten alloy.It is very high than complexity and cost that the shortcoming of this method implements exactly.

Purpose of the present invention just provides a kind of iron/nickel alloy with low manganese content, and it has good high-temperature ductility and available ordinary method melting.

Thus, theme of the present invention is a kind of iron/nickel alloy, and its chemical constitution comprises (by weight): 35.5%≤Ni≤37%

Mn≤0.1％

0.03％≤Si≤0.15％ 0.0001％≤Ca≤0.002％ 0.0001％≤Mg≤0.002％

Al≤0.005％

S≤0.001％

O≤0.01％

N≤0.005％

P≤0.003％

This chemical constitution satisfies following relation:

S≤0.02×Mn＋0.8×Ca＋0.6×Mg

Preferably, its chemical constitution is:

O≤0.005％

N≤0.003％

S≤0.0005％

In order after thermal treatment, to obtain the surface smoothness that good deep drawing quality is become reconciled, preferably:

C≤0.005％

B≤0.0004％

Preferably, nickel content must be between 35.8% and 36.3%, better between 35.9% and 36.2%, and Cr≤0.1%, Cu≤0.1%, Mo≤0.1, V≤0.1%, Nb≤0.1%.

In order to obtain the very low coefficient of expansion, preferably: Cr+Cu+Mo+V+Nb+Si≤0.15%.

The invention still further relates to a kind of band of being made by iron/nickel alloy of the present invention, it is by hot rolling, and cold rolling gets then, and its width is greater than 400mm, and the linear expansivity between 20 ℃ and 100 ℃ is less than 0.9 * 10 ^-6/ K.

To be described in detail the present invention below, but not be to narrate with the form that limits.

Alloy according to the present invention is a kind of alloy based on iron and nickel, and it contains the nickel of 35.5%-37%, and quantity is lower than 3% optional complementary element, and as cobalt, chromium, copper, molybdenum, vanadium or niobium, they add to regulate the mechanical property of alloy according to purposes.

Must guarantee that this alloy contains less than 0.1%, preferably less than 0.05% manganese, because this element can increase thermal expansivity.

The shortcoming of low manganese content is that thermal distortion (high-temperature ductility) is had disadvantageous effect, and for the high-temperature ductility that obtains, this alloy should contain together:

-less than 0.001%, preferably less than 0.0005% sulphur,

-phosphorus less than 0.003%,

Calcium between-0.0001% and 0.002%,

Magnesium between-0.0001% and 0.002%,

Silicon between-0.03% and 0.015%.

Manganese, calcium, magnesium and sulphur content must satisfy:

S≤0.02×Mn＋0.8×Ca＋0.6×Mg

Calcium and Mg content are limited in 0.002%, produce the big inclusion of pit when preventing to be formed on chemical chop, and be all the more so when alloy is used to make the baffle of cathode tube with sheet form.

For the high-temperature ductility that obtains, this alloy should contain less than 0.005% aluminium with less than 0.005%, preferably less than 0.003% nitrogen.It also should contain less than 0.01%, preferably less than 0.005% oxygen.

In order to obtain the as far as possible little coefficient of expansion, nickel content should be preferably between 35.8% and 36.3%, and more preferably between 35.9% and 36.2%, optimum content is 36.05%.

Alloying element chromium, copper, molybdenum, vanadium, niobium and silicon have adverse influence to the coefficient of expansion.In addition, when seeking the as far as possible little coefficient of expansion, the content of each should keep less than 0.1% in these elements, preferably less than 0.05%.Preferably can satisfy:

Cr＋Cu＋Mo＋V＋Nb＋Si≤0.15％

Cobalt be a kind of nickel that can partly replace until 10% element, but to stand chemical erosion when alloy, when for example carrying out chemical milling, this element just has shortcoming, and its content preferably is limited to 0.5%, and is all the more so when especially this alloy is intended to be used for to make the baffle of cathode tube.

When this alloy was used to make the thin plate for the treatment of deep-draw, it must contain less than 0.02%, preferably less than 0.010%, was more preferably less than 0.005% carbon, so that have as far as possible little yielding stress, this is favourable to good deep-draw characteristic.

In order to prevent to form pore, hydrogen richness must be less than 0.001%, preferably less than 0.0005%.Boron content should keep less than 0.01%, preferably less than 0.0004%, to prevent that the surface at product forms boron nitride in heat treatment process.These nitride form a powdery layer, cause black layer (blacking layer) the tackiness variation that forms on baffle.

The surplus that this alloy is formed is an iron.

This alloy can be made into ingot bar or ingot blank by hot rolling, and by can be made into thickness after cold rolling less than 0.3mm, width is greater than the strip of 400mm, and they are particularly suitable for being used for making the baffle of negative ray screen.

As embodiment, the ingot blank of the iron/nickel alloy of chemical constitution following (by weight) is carried out hot rolling, cold rolling then, make wide 600mm, the band of thick 0.15mm:

Ni：35.97％

Co：0.019％

Cr：0.025％

Cu：＜0.01％

Mo：0.0058％

V?：＜0.005％

Nb：＜0.005％

Mn：0.041％

Si：0.048％

S?：＜0.0005％

Ca：0.0002％

Mg：0.0003％

Al：＜0.005％

O?：0.0045％

C?：0.0033％

N?：0.0032％

P?：＜0.003％

H?：＜0.001％

B?：＜0.0004％

When content with " less than " when expression, refer to that they are lower than the limit of used sensitivity of analytical method.

Can not form crackle when carrying out hot rolling.The coefficient of expansion is 0.81 * 10 ^-6/ K.800 ℃ of following thermal treatments after 30 minutes, yielding stress E _0.2Be 270MPa, and coercive field is 0.45O _eThe chemical milling performance of this band is fine.All these character make it be particularly suitable for making the baffle of cathode tube.

Alloy of the present invention also can be used for numerology or is used to make bimetallic strip.

Claims

1. have low-expansion iron/nickel alloy, it is characterized in that, its chemical constitution (by weight) comprising:

35.5％≤Ni≤37％

Mn≤0.1％

0.03％≤Si≤0.15％

0.0001％≤Ca≤0.002％

0.0001％≤Mg≤0.002％

Al≤0.005％

S≤0.001％

O≤0.01％

N≤0.005％

P≤0.003％

C≤0.005％

B≤0.0004％

H≤0.001％

Cr≤0.1％

Cu≤0.1％

Mo≤0.1％

V≤0.1％

Nb≤0.1％

Co≤0.5% surplus is an iron, and satisfies:

S≤0.02×Mn＋0.8×Ca＋0.6×Mg。

2. according to the iron/nickel alloy of claim 1, it is characterized in that:

O≤0.005％

N≤0.003％

S≤0.0005％。

3. according to the iron/nickel alloy of claim 1 or 2, it is characterized in that:

35.8％≤Ni≤36.3％

4. according to the iron/nickel alloy of claim 3, it is characterized in that:

35.9％≤Ni≤36.2％

5. according to each alloy among the claim 1-4, it is characterized in that:

Cr＋Cu＋Mo＋V＋Nb＋Si≤0.15％。

By each iron/nickel alloy among the claim 1-5 by hot rolling, the cold rolling then band of making is characterized in that, its width is greater than 400mm, the thermal expansivity between 20 ℃ and 100 ℃ is less than 0.9 * 10 ^-6/ K.