US RE40,263 E1
Pearlitic steel rail having excellent wear resistance and method of producing the same
Masaharu Ueda, Kitakyushu (Japan); Hideaki Kageyama, Kitakyushu (Japan); Kouichi Uchino, Kitakyush (Japan); Koji Babazono, Kitakyush (Japan); and Ken Kutaragi, Kitakyush (Japan)
Assigned to Nippon Steel Corporation, Tokyo (Japan)
Appl. No. 10/974,048
PCT Filed Jul. 15, 1996, PCT No. PCT/JP95/02312
§ 371(c)(1), (2), (4) Date Jul. 15, 1996,
PCT Pub. No. WO96/15282, PCT Pub. Date May 23, 1996.
Application 10/974048 is a reissue of application No. 08/676159, filed on Nov. 13, 1995, now 5,762,723, filed on Jun. 09, 1998.
Claims priority of application No. 6-280916 (JP), filed on Nov. 15, 1994; application No. 7-046753 (JP), filed on Mar. 07, 1995; application No. 7-046754 (JP), filed on Mar. 07, 1995; and application No. 7-270336 (JP), filed on Oct. 18, 1995.
Int. Cl. C21D 9/04 (2006.01)
U.S. Cl. 148—581  [148/320] 12 Claims
OG exemplary drawing
 
8. A pearlite type [ pearlitic ] steel rail [ , ] having a good weldability and a good wear resistance according to claim 3, [ resistance, wherein a structure of said steel rail is pearlite, a pearlite lamella space of said pearlite is not more than 100 nm, and a ratio of a cementite thickness to a ferrite thickness in said pearlite is at least 0.15,] said steel rail comprising, in terms of percent by weight:
C: 0.86 to 1.20%,
Si: 0.10 to 1.00%,
Mn: 0.40 to 1.50%,
wherein [ Cr and the balance consisting of iron and unavoidable impurities,]
said chemical components Si, Cr and Mn satisfy the relation Si+Cr+Mn=1.5 to 3.0% in terms of percent by weight [ and wherein a head portion of said steel rail does not contain a pro-eutectic cementite structure] .