Arcelormittal

Arcelormittal France

Gerard Dugelay

Alain Bello

Vivian Fabbri

The present invention provides a steel part. The steel part includes a steel precoated with a zinc-based alloy including, the contents being expressed by weight, from 0.5 to 2.5% aluminum and, optionally, one or more elements chosen from the group of: Pb&#x2264;0.003%; Sb&#x2264;0.003%; Bi&#x2264;0.003%; 0.002%.&#x2264;Si&#x2264;0.070%; La&#x3c;0.05%; and Ce&#x3c;0.05%. A balance of the precoat includes zinc and inevitable impurities. The steel part also includes a compound formed by at least one heat treatment for alloying between the steel and the precoat. The compound includes over more than 90% of its thickness, at least one Fe/Zn-based phase, the iron weight content of which is equal to 65% or higher and the Fe/Zn ratio of which is between 1.9 and 4. A structural or safety part is also provided.

Part with very high mechanical properties from a rolled coated sheet

The invention relates to a steel part coated with a compound consisting, over more than 90% of its thickness, of at least one Fe/Zn-based phase, the iron weight content of which is equal to 65% or higher and the Fe/Zn ratio of which is between 1.9 and 4, said compound being formed by at least one heat treatment for alloying between said steel and a precoat, said precoat consisting of a zinc alloy comprising, the contents being expressed by weight, between 0.5 and 2.5% aluminum and, optionally, one or more elements chosen from: Pb&#x2266;0.003%; Sb&#x2266;0.003%; Bi&#x2266;0.003%; 0.002%&#x2266;Si&#x2266;0.070%; La&#x3c;0.05%; Ce&#x3c;0.05%, the balance consisting of zinc and inevitable impurities.

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Metz, France

Gerard Dugelay