Method for production of sheet of austenitic...

Details Method for production of sheet of austenitic... Method for production of sheet of austenitic...

2011-07-12

2011-07-12

King, Roy (Department: 1733)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S329000, C148S621000, C148S628000, C148S655000

Reexamination Certificate

active

07976650

ABSTRACT:
The invention relates to a process for manufacturing a corrosion-resistant cold-rolled sheet of iron-carbon-manganese austenitic steel, comprising the following steps: a sheet whose chemical composition comprises, the contents being expressed by weight: 0.35%≦C≦1.05%, 16%≦Mn≦24%, the balance of the composition consisting of iron and inevitable impurities resulting from its smelting, is provided; said sheet is cold-rolled; and a recrystallization annealing treatment is carried out on said sheet in a furnace containing a gas chosen from gases that are reducing with respect to iron, the parameters of said annealing being chosen in such a way that said sheet is covered on both its sides with an essentially amorphous (Fe,Mn)O oxide sublayer and with an external crystalline manganese oxide (MnO) layer, the total thickness of these two layers being equal to or greater than 0.5 microns.

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