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Iron-nickel alloy having a low coefficient of expansion

a technology of low coefficient of expansion and iron-nickel alloy, which is applied in the field of iron/nickel alloy, can solve the problems of high cost, complicated implementation, and difficult hot-deformation of alloys by rolling or forging, and achieves good hot-ductility and low coefficient of linear expansion

Inactive Publication Date: 2001-11-29
IMPHY SA FR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an iron / nickel alloy with low manganese content and a low coefficient of expansion. The alloy has good hot ductility and can be smelted using conventional processes. The alloy can be used to make a product, such as a strip, with a low coefficient of linear expansion. The alloy contains specific amounts of sulfur, phosphorus, calcium, magnesium, silicon, and aluminum to achieve good hot ductility and surface finish after heat treatment. The alloy has a balance of iron and nickel content between 35% and 37%. The invention also provides a method for making the iron / nickel alloy.

Problems solved by technology

Unfortunately, and because of the presence of impurities, these alloys are difficult to hot-deform by rolling or by forging.
However such addition has the drawback of appreciably increasing the coefficient of expansion of the alloy.
This process, however, has the drawback of being complicated to implement and being very expensive.

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0049] A 600 mm wide and 0.15 mm thick strip was manufactured by hot-rolling and then cold-rolling an ingot of iron / nickel alloy whose chemical composition was, by weight,:

[0050] Ni: 35.97%

[0051] Co: 0.019%

[0052] Cr: 0.025%

[0053] Cu: <0.01%

[0054] Mo: 0.0058%

[0055] V: <0.005%

[0056] Nb: <0.005%

[0057] Mn: 0.041%

[0058] Si: 0.048%

[0059] S: <0.0005%

[0060] Ca: 0.0002%

[0061] Mg: 0.0003%

[0062] Al: <0.005%

[0063] O: 0.0045%

[0064] C: 0.0033%

[0065] N: 0.0032%

[0066] P: <0.003%

[0067] H: <0.001%

[0068] B: <0.0004%

[0069] When the contents of elements above are indicated as being "less than" a certain value, this means that they are contained in amounts less than the limit of sensitivity of the analytical methods used.

[0070] Hot rolling was carried out without forming crazes. The coefficient of expansion was 0.81.times.10.sup.-6 / K. After heat treatment for 30 minutes at 800.degree. C., the yield stress E.sub.0.2 was 270 MPa and the coercive field was 0.45 Oe. The strip exhibited very good chemical etc...

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Abstract

Iron / nickel alloy having a low coefficient of expansion, the chemical composition of which comprises iron, nickel, manganese, silicon, calcium, magnesium, less than 0.005% of aluminum, less than 0.001% of sulfur, less than 0.01% of oxygen, less than 0.005% of nitrogen, and less than 0.003% of phosphorus, the chemical composition furthermore satisfying the relationship:<paragraph lvl="0"><in-line-formula>S<=0.02xMn+0.8xCa+0.6xMg< / in-line-formula>

Description

[0001] 1. Field of the Invention[0002] The present invention relates to an iron / nickel alloy having a low coefficient of linear expansion and to a product, preferably a strip, comprising this alloy and obtained by hot rolling and then, optionally, cold rolling.[0003] 2. Discussion of the Background[0004] Iron / nickel-containing alloys having a low coefficient of expansion, containing between 35% and 40% by weight of nickel are well known. However, in addition to nickel and iron, these alloys always contain impurities such as sulfur, phosphorus, oxygen, nitrogen and carbon, typically resulting from smelting. The alloys may also contain elements such as cobalt, chromium, copper, molybdenum, vanadium, niobium and silicon which are added to adjust mechanical properties. Unfortunately, and because of the presence of impurities, these alloys are difficult to hot-deform by rolling or by forging. In order to improve the hot deformability, it is known to add manganese in amounts greater than ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C38/00C22C38/08C22C38/54
CPCC22C38/08C22C38/54
Inventor BAUDRY, JACQUESFARAL, MICHELTIERS, JEAN-FRANCOIS
Owner IMPHY SA FR
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