Maraging steel and process for manufacturing a strip or a part cut out of a strip of cold-rolled maraging steel
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Dec 16, 2003
Grant Date -
May 23, 2002
app pub date -
Nov 19, 2001
filing date -
Nov 17, 2000
priority date (Note) -
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Abstract
A maraging steel strip or part and process for manufacture of a strip or of a part cut out of a strip of cold-rolled maraging steel and hardened by a hardening heat treatment. In the process, before the hardening heat treatment is performed, the strip or the part is subjected to cold plastic deformation with a degree of working greater than 30% and the strip or the part is subjected to recrystallization annealing in order to obtain a fine-grained structure with ASTM index higher than 8. The composition by weight of the maraging steel is: 12%.ltoreq.Ni.ltoreq.24.5%; 2.5%.ltoreq.Mo.ltoreq.12%; 4.17%.ltoreq.Co.ltoreq.20%, Al %.ltoreq.0.15%; Ti.ltoreq.0.1%; N.ltoreq.0.003%; Si.ltoreq.0.1%; Mn.ltoreq.0.1%; C.ltoreq.0.005%; S.ltoreq.0.001%; P.ltoreq.0.005%; H.ltoreq.0.0003%; O.ltoreq.0.001%; iron and impurities resulting from smelting, the chemical composition also satisfying the relationships: 20%.ltoreq.Ni+Mo.ltoreq.27%; 50.ltoreq.Co.times.Mo.ltoreq.200; Ti.times.N.ltoreq.2.times.10.sup.-4.
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