Abstract: Armour-plate comprising a two layer bonded subsequently heat-treated clad steel comprising an upper layer and a base layer wherein:(a) the upper layer contains (in percent by weight)______________________________________ 0.30 to 0.80% carbon 0.10 to 0.80% silicon 0.40 to 1.20% manganese up to 0.015% phosphorus up to 0.015% sulfur 0.20 to 2.80% chromium 0.05 to 1.00% molybdenum 0.01 to 0.05% aluminum up to 0.40% nickel ______________________________________remainder iron including unavoidable impurities;(b) said base layer contains (in percent by weight) ______________________________________ 0.17 to 0.40% carbon 0.10 to 0.80% silicon 0.40 to 2.00% manganese up to 0.025% phosphorus up to 0.025% sulfur 0.10 to 1.50% chromium 0.05 to 1.50% molybdenum 0.01 to 0.05% aluminum ______________________________________remainder iron including unavoidable impurities the carbon content of said upper layer being substantially higher than the carbon content of said base material.
Type:
Grant
Filed:
November 1, 1984
Date of Patent:
February 24, 1987
Assignee:
Thyssen Stahl AG
Inventors:
Hans Pircher, Werner Bentz, Alfred Tegethoff
Abstract: The invention relates to a process for producing steel of low phosphorus content from hot metal of usual phosphorus content, in which the hot metal is simultaneously decarburized and dephosphorized in a single process step in a metallurgical vessel, in particular in a converter. The refining gas consisting predominantly or completely of technically pure oxygen is top-blown into the melt, particularly from below. The vessel is charged with hot metal containing manganese in an amount of less than 0.2% by weight. Lime is then added and refining is carried out down to a final phosphorus content of 0.005% by weight or less in the steel at the end of blowing, without a change of slag.
Type:
Grant
Filed:
September 11, 1985
Date of Patent:
August 5, 1986
Assignee:
Thyssen Stahl AG
Inventors:
Erich Hoffken, Wolfram Florin, Rudolf Hammer
Abstract: A method and composition for desulfurization of hot metal is disclosed. To the hot metal there is added a composition comprising calcium carbide, a hydrogen releasing compound and magnesium.
Type:
Grant
Filed:
December 13, 1984
Date of Patent:
June 3, 1986
Assignees:
Thyssen Stahl AG, SKW Trostberg AG
Inventors:
Heinrich Rellermeyer, Walter Meichsner, Werner Gmohling
Abstract: The invention relates to a process for desulphurizing hot metal in a ladle, in particular in a torpedo ladle, wherein first aluminum and then, by means of a carrier gas, lime (CaO) are blown into the hot metal. The characterizing feature of the invention is that at a rate of 2-20 liters (S.T.P.) of carrier gas/kg of desulphurizing agent, a solid which evolves a gas in the hot metal is blown in together with the lime.
Type:
Grant
Filed:
June 12, 1985
Date of Patent:
May 6, 1986
Assignee:
Thyssen Stahl AG
Inventors:
Rudolf Hammer, Walter Meichsner, Karl-Heinz Peters