Internal high hardness type pearlitic rail with excellent...

Details Internal high hardness type pearlitic rail with excellent... Internal high hardness type pearlitic rail with excellent...

2011-06-07

2011-06-07

Yee, Deborah (Department: 1733)

Metal treatment

Stock

Ferrous

C148S581000, C148S584000, C148S334000, C148S335000

Reexamination Certificate

active

07955445

ABSTRACT:
An internal high hardness type pearlitic rail that has a composition containing 0.73% to 0.85% by mass C, 0.5% to 0.75% by mass Si, 0.3% to 1.0% by mass Mn, 0.035% by mass or less P, 0.0005% to 0.012% by mass S, 0.2% to 1.3% by mass Cr, and the balance being Fe and incidental impurities, in which the value of [% Mn]/[% Cr] is greater than or equal to 0.3 and less than 1.0, where [% Mn] represents the Mn content, and [% Cr] represents the Cr content, and in which the internal hardness of a rail head that is defined by the Vickers hardness of a portion located from a surface layer of the rail head to a depth of at least 25 mm is greater than or equal to 380 Hv and less than 480 Hv.

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Machine-English translation of Japanese patent 10-195601, Ueda Masaharu et al., Jul. 28, 1998.
“Residual Elements” , Metallurgy of Stainless Steels, p. 14-2, ASM 1992.
English-hand translation of Japanese patent 10-195601, Ueda Masaharu et al. Jul. 28, 1998.

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