Patent ID: 6558483
Filing Date: 2003-05-06
Classification: C21D,C22C

Abstract:
A Cu precipitation strengthened steel which comprises, on the mass percent basis, C: 0.02-0.10%, Mn: 0.3-2.5%, Cu: 0.5-2.0%, Ni: 0.3-4.0% and Ti: 0.004-0.03% and further comprises Si: 0.01-0.4% and/or Al: 0.001-0.1%, with the contents of incidental impurities being P: not more than 0.025%, S: not more than 0.01%, N: not more than 0.006% and Se: not more than 0.005%, with the value of Pcm defined by the formula (1) given below being not more than 0.28: Pcm&it;â€ƒ=â€ƒ&it;C&it;â€ƒ+â€ƒ&it;Si30&it;â€ƒ+â€ƒ&it;Mn20&it;â€ƒ+â€ƒ&it;Cu20&it;â€ƒ+â€ƒ&it;Ni60&it;â€ƒ+â€ƒ&it;Cr20&it;â€ƒ+â€ƒ&it;Mo15&it;â€ƒ+â€ƒ&it;V10&it;â€ƒ+â€ƒ&it;5&it;â€ƒ&it;B(1)where C, Si, Mn, Cu, Ni, Cr, Mo, V and B respectively represent the contents (in mass percent) of the respective elements.