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
US20010045246A1Inactive Publication Date: 2001-11-29IMPHY SA FR
0 Cites 5 Cited by

Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
IMPHY SA FR
Publication Date
2001-11-29
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

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>
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More