Aperam

Bertrand Petit

Frédéric Bridault

Audrey Allion

Jessica Delacroix

Austenitic stainless-steel made of steel having a composition in weight percentages, consisting of: traces≤C≤0.03%; 1.0%≤Mn≤2.0%; 0.8%≤Si≤2.0% %; preferentially 1.0%≤Si≤1.5%; traces≤Al≤0.06% %; traces≤P≤0.045%; traces≤S≤0.015%; 8.0%≤Ni≤12.0%; 17.5%≤Cr≤20.0%; 0.4%≤ Mo≤0.8%; traces≤Sn≤0.05%; traces≤Nb≤0.08%; traces≤V≤0.15%; traces≤Ti≤ 0.08%; traces≤Zr≤0.08%; traces≤Co≤1.0%; traces≤B≤0.01%; traces≤W+Mo≤0.8%; traces≤Pb≤0.03%; traces≤N≤0.1%; traces≤O≤0.01%; the rest being iron and impurities resulting from the production. Plates for heat exchangers, and chimney ducts, made of such steel.

Austenitic stainless-steel, plates for heat exchangers, and chimney ducts made with this steel

Method for welding two stainless steel sheets of thickness (e) 0.10 to 6.0 mm and having a particular composition having: a first welding step lasting a time (t) in ms: 0.10 to 0.50 mm, t=(40&#xd7;e+36)&#xb1;10%; 0.51 to 1.50 mm: t=(124&#xd7;e 13)&#xb1;10%; 1.51 to 6.0 mm: t=(12&#xd7;e+47)&#xb1;10%; with clamping force (F) in daN: 0.10 to 1.50 mm: F=(250&#xd7;e+90)&#xb1;10%; 1.51 mm to 6.0 mm: F=(180&#xd7;e+150)&#xb1;10%; appling a current between the welding electrodes, of intensity between 80 and 100% the maximum permissible intensity corresponding to expulsion of molten metal; a second step with an intensity between zero and 1 kA; and a third step with an intensity of 3.5 kA to 4.5 kA, for a time of at least 755 ms.

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Auchel, France

Bertrand Petit