Abstract: A process for production of sheet-metal strip of niobium-stabilized 14% chromium ferritic steel, characterized in that certain steel is subjected to: cold rolling of the hot sheet metal with or without preliminary annealing, final annealing of the sheet-metal strip at a temperature of between 800° C. and 1100° C. for a duration of between 1 minute and 5 minutes and preferably at a temperature of about 1050° C. for a time of about 2 minutes. Steel and exhaust manifold.
Type:
Grant
Filed:
March 14, 2002
Date of Patent:
July 26, 2005
Assignee:
Ugine SA
Inventors:
Silke Liesert, Laurent Antoni, Pierre Olivier Santacreu
Abstract: A process for production of sheet-metal strip of niobium-stabilized 14% chromium ferritic steel, characterized in that certain steel is subjected to:
Type:
Application
Filed:
March 14, 2002
Publication date:
September 19, 2002
Applicant:
UGINE SA
Inventors:
Silke Liesert, Laurent Antoni, Pierre Olivier Santacreu
Abstract: A process for production of sheet-metal strip of niobium-stabilized 14% chromium ferritic steel, characterized in that certain steel is subjected to:
cold rolling of the hot sheet metal with or without preliminary annealing,
final annealing of the sheet-metal strip at a temperature of between 800° C. and 1100° C. for a duration of between minute and 5 minutes and preferably at a temperature of about 1050° C. for a time of about 2 minutes. Steel and exhaust manifold.
Type:
Grant
Filed:
September 8, 2000
Date of Patent:
July 23, 2002
Assignee:
Ugine SA
Inventors:
Silke Liesert, Laurent Antoni, Pierre Olivier Santacreu
Abstract: Corrosion-resistant low-nickel austenitic stainless steel having the following compostion in percentages by weight:
0.01%<carbon<0.08%,
0.1%<silicon<1%,
5%<manganese<11%,
15%<chromium<17.5%,
1%<nickel<4%,
1%<copper<4%,
1×10−4%<sulfur<20×10−4%,
1×10−4%<calcium<50×10−4%,
0%<aluminum<0.03%,
0.005%<phosphorus<0.1%,
boron<5×10−4%,
oxygen<0.01%,
the balance being iron and impurities resulting from the smelting operation.
Abstract: A process for producing a foaming slag above a stainless steel melted in an electric furnace, in which:
a powder containing at least one metal oxide and carbon in its composition is introduced into the slag,
at least one oxide present in the powder is reduced by its reaction with the carbon to form in the slag bubbles composed of the metal of the metal oxide and of carbon monoxide, the bubbles present in the slag giving rise to a slag in the form of a stable foam.