Vdm Metals International Gmbh

Vdm Metals Gmbh

Stefan Gilges

Nicole De Boer

Heike Hattendorf

Martin Wolf

Andreas Heckmann

Zülfükil Tas

Karl-Heinz Appel

Jens Koepernik

Zuelfuekil Tas

The invention relates to methods for the manufacture of nickel alloys having optimized strip weldability (TIG without filler) from an alloy of the following composition (in wt %): C max. 0.05%, Co max. 2.5%, Ni the rest, especially &#x3e;35-75.5%, Mn max. 1.0%, Si max. 0.5%, Mo &#x3e;2 to 23%, P max. 0.2%, S max. 0.05%, N up to 0.2%, Cu &#x2264;1.0%, Fe &#x3e;0 to &#x2264;7.0%, Ti &#x3e;0 to &#x3c;2.5%, Al &#x3e;0 to 0.5%, Cr &#x3e;14 to &#x3c;25%, V max. 0.5%, W up to 3.5%, Mg up to 0.2%, Ca up to 0.02%, in that the alloy is smelted openly and cast as ingots, the ingots are subjected if necessary to at least one heat treatment, the ingots are then remelted at least one time by electroslag refining, the remelted ingot obtained in this way is subjected if necessary to at least one heat treatment, the ingot is subjected to at least one cold and/or hot deformation cycle, until strip material of predeterminable material thickness exists, the strip material is subdivided into strip sections of defined lengths/widths.

Method for producing nickel alloys with optimized strip weldability

A method for producing a metal film from an over 50% nickel alloy melts more than one ton of the alloy in a furnace, followed by VOD or VLF system treatment, then pouring off to form a pre-product, followed by re-melting by VAR and/or ESU. The pre-product is annealed 1-300 hours between 800 and 1350&#xb0; C. under air or protection gas, then hot-formed between 1300 and 600&#xb0; C., such that the pre-product then has 1-100 mm thickness after the forming and is not recrystallized, recovered, and/or (dynamically) recrystallized having a grain size below 300 &#x3bc;m. The pre-product is pickled, then cold-formed to produce a film having 10-600 &#x3bc;m end thickness and a deformation ratio greater than 90%. The film is cut into 5-300 mm strips, annealed 1 second to 5 hours under protection gas between 600 and 1200&#xb0; C. in a continuous furnace, then recrystallized to have a high cubic texture proportion.

Method for producing a metal film

A method for producing a metal film from an over 50% nickel alloy melts more than one ton of the alloy in a furnace, followed by VOD or VLF system treatment, then pouring off to form a pre-product, followed by re-melting by VAR and/or ESU. The pre-product is annealed 1-300 hours between 800 and 1350&#xb0; C. under air or protection gas, then hot-formed between 1300 and 600&#xb0; C., such that the pre-product then has 1-100 mm thickness after the forming and is not recrystallized, recovered, and/or (dynamically) recrystallized having a grain size below 300 &#x3bc;m. The pre-product is pickled, then cold-formed to produce a film having 10-600 &#x3bc;m end thickness and a deformation ratio greater than 90%. The film is cut into 5-300 mm strips annealed 1 second to 5 hours under protection gas between 600 and 1200&#xb0; C. in a continuous furnace, then recrystallized to have a high cubic texture proportion.

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Altena, Germany

Stefan Gilges