PRODUCTION OF HIGH STRENGTH AND HIGH TOUGHNESS RAIL

Japanese Patent JP3802604

B2

PROBLEM TO BE SOLVED: To produce a rail excellent in strength and toughness, at the time of producing a rail for a railway, by executing hot finish rolling and heat treatment under specified temp. conditions.
SOLUTION: At the time of producing a rail by subjecting a steel for a rail to hot rolling, in the finish rolling stage after rough rolling, finish rolling for one or plural passes is executed at ≥20% draft per pass so as to regulate the temp. of the rail head to come in direct contact with a wheel to the range of 1050 to 900°C. Successively, the rail after the hot fisnihing is rapidly cooled to 950 to 700°C at a cooling rate of ≥4°C/s to suppress the growth of austenitic grains, is held to the same temp. for 0.5 to 10min and is subjected to accelerated cooling to the temp. range of ≤600°C at a cooling rate of 2 to 15°C/s to form the structure of the rail head into fine pearlite, by which the rail excellent in strength and toughness can be produced.

WO/2022/180146	HIGH-STRENGTH HOT-ROLLED FLAT STEEL PRODUCT HAVING HIGH LOCAL COLD FORMABILITY AND A METHOD OF PRODUCING SUCH A FLAT STEEL PRODUCT
JP5255474	Method of manufacturing iron-based shape memory alloy profile
JPH055127	PRODUCTION OF HIGH STRENGTH STEEL SHEET PILE

Daisuke Hirakami
Koichi Uchino
Toshiya Kuroki
Kageyama Hideaki

JP5650196A

July 26, 2006

March 13, 1996

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Nippon Steel Corporation

C21D8/00; C21D9/04; (IPC1-7): C21D8/00; C21D9/04

JP7173530A
JP9332501A
JP63277721A

Hiroaki Tamura
Tatsuo Chanoki

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