Railway vehicle wheel and method for manufacturing railway vehicle wheel

Patent metadata

Field	Value
Publication number	US-2017191149-A1
Application number	US-201515313186-A
Country	US
Kind code	A1
Filing date	Jun 9, 2015
Priority date	Jun 11, 2014
Publication date	Jul 6, 2017
Grant date	—

Abstract

Provided is a railway vehicle wheel that enables further reducing wear and fatigue damage of the wheel and rail in total. A railway vehicle wheel containing, in mass %: 0.65% to 0.84% of C; 0.1% to 1.5% of Si; 0.05% to 1.5% of Mn; 0.025% or less of P; 0.015% or less of S; 0.001% to 0.08% of Al; and 0.05% to 1.5% of Cr, the balance being Fe and incidental impurities, wherein a microstructure at least in a region extending from a tread to a depth of 15 mm is a pearlite structure, and a pearlite lamellar spacing at least in the region is 150 nm or less.

First claim

1 - 8 . (canceled)

9 . A railway vehicle wheel containing, in mass %: 0.65% to 0.84% of C; 0.1% to 1.5% of Si; 0.05% to 1.5% of Mn; 0.025% or less of P; 0.015% or less of S; 0.001% to 0.08% of Al; and 0.05% to 1.5% of Cr, the balance being Fe and incidental impurities, wherein a microstructure at least in a region extending from a tread to a depth of 15 mm is a pearlite structure, and a pearlite lamellar spacing at least in the region is 150 nm or less.

10 . The railway vehicle wheel according to claim 9 further containing, in mass %, one or more of: 0.03% to 0.5% of Cu; 0.03% to 0.5% of Ni; 0.02% to 0.2% of Mo; 0.003% to 0.3% of V; 0.003% to 0.1% of Nb; and 0.002% to 0.02% of Ti.

11 . The railway vehicle wheel according to claim 9 , wherein the region has a mean pearlite block size of 30 μm or less.

12 . The railway vehicle wheel according to claim 10 , wherein the region has a mean pearlite block size of 30 μm or less.

13 . The railway vehicle wheel according to claim 9 , wherein the railway vehicle wheel has a 0.2% yield strength (YS) of 700 MPa or more and a yield ratio of 60% or more, when measured at 15 mm inside the tread.

14 . The railway vehicle wheel according to claim 10 , wherein the railway vehicle wheel has a 0.2% yield strength (YS) of 700 MPa or more and a yield ratio of 60% or more, when measured at 15 mm inside the tread.

15 . The railway vehicle wheel according to claim 11 , wherein the railway vehicle wheel has a 0.2% yield strength (YS) of 700 MPa or more and a yield ratio of 60% or more, when measured at 15 mm inside the tread.

16 . The railway vehicle wheel according to claim 12 , wherein the railway vehicle wheel has a 0.2% yield strength (YS) of 700 MPa or more and a yield ratio of 60% or more, when measured at 15 mm inside the tread.

17 . The railway vehicle wheel according to claim 11 , wherein the railway vehicle wheel has a 0.2% yield strength (YS) of 700 MPa or more, a yield ratio of 60% or more, an elongation of 12% or more, and a Charpy impact value at 20° C. of 15 J or more, when measured at 15 mm inside the tread.

18 . The railway vehicle wheel according to claim 12 , wherein the railway vehicle wheel has a 0.2% yield strength (YS) of 700 MPa or more, a yield ratio of 60% or more, an elongation of 12% or more, and a Charpy impact value at 20° C. of 15 J or more, when measured at 15 mm inside the tread.

19 . A method for manufacturing a railway vehicle wheel comprising:
preparing steel by steelmaking in an electric heating furnace or converter, the steel containing, in mass %, 0.65% to 0.84% of C, 0.1% to 1.5% of Si, 0.05% to 1.5% of Mn, 0.025% or less of P, 0.015% or less of S, 0.001% to 0.08% of Al, and 0.05% to 1.5% of Cr, the balance being Fe and incidental impurities; casting the steel to obtain a material; subjecting the material to hot rolling and/or hot forging to form a wheel; heating the formed wheel to a heating temperature of Ac 3 point+50° C. or higher; subjecting the wheel to accelerated cooling at a cooling start temperature of 700° C. or higher, a cooling rate of 1° C./s to 10° C./s, a cooling stop temperature of 500° C. to 650° C.; and then subjecting the wheel to air cooling.

20 . The method for manufacturing a railway vehicle wheel according to claim 19 , wherein the steel further contains, in mass %, one or more of: 0.03% to 0.5% of Cu; 0.03% to 0.5% of Ni; 0.02% to 0.2% of Mo; 0.003% to 0.3% of V; 0.003% to 0.1% of Nb; and 0.002% to 0.02% of Ti.

21 . The method for manufacturing the railway vehicle wheel according to claim 19 , wherein the heating temperature is Acs point+150° C. or lower.

22 . The method for manufacturing the railway vehicle wheel according to claim 20 , wherein the heating temperature is Acs point+150° C. or lower.

Assignees

• Jfe Steel Corp

Inventors

• Kimura Tatsumi
• Iwamoto Takashi
• Endo Shigeru
• Honjo Minoru
• Ichimiya Katsuyuki
• Hase Kazukuni
• Tokunaga Kazuya

Classifications

• C21D9/34

  for tyres; for rims · CPC title

• C22C38/06

  containing aluminium · CPC title

• C22C38/00

  Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00) · CPC title

• C21D2211/009

  Pearlite · CPC title

• C22C38/22

  with molybdenum or tungsten · CPC title