Ascometal

Philippe Damie

Christian Turrel

A carbon or low-alloy steel is provided with improved machinability. The carbon content of the steel is less than 1.5% and the sum of the alloy elements contained therein is less than 9%. The steel contains oxide and sulfide inclusions, and the chemical composition of the steel includes 0.1%&lE;Mn, 0.01%&lE;Al&lE;0.05%, 0.025%&lE;S&lE;0.3%, 0.002%&lE;Ca, O&lE;0.0015% by weight; the &ldquo;KO oxides&rdquo; cleanness index is less than 30, all the oxides are lime aluminates, and the average calcium content of type 2, type 3, type 4 and type 5 inclusions is less than 30%. A process of manufacturing such steel and an oxide-core wire for its manufacture are also provided.

Process for the manufacture of carbon or low-alloy steel with improved machinability

A carbon or low-alloy steel is provided with improved machinability. The carbon content of the steel is less than 1.5% and the sum of the alloy elements contained therein is less than 9%. The steel contains oxide and sulfide inclusions, and the chemical composition of the steel includes 0.1%&lE;Mn, 0.01%&lE;Al&lE;0.05%, 0.025%&lE;S&lE;0.3%,0.002%&lE;Ca, O&lE;0.0015% by weight; the &ldquo;KO oxides&rdquo; cleanness index is less than 30, all the oxides are lime aluminates, and the average calcium content of type 2, type 3, type 4 and type 5 inclusions is less than 30%. A process of manufacturing such steel and an oxide-core wire for its manufacture are also provided.

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Dunkerque, France

Philippe Damie