STEEL RAIL AND PRODUCTION METHOD THEREOF

WIPO Patent Application WO/2011/155481

A1

The disclosed steel rail contains, by mass percent, 0.85-1.20 % carbon, 0.05-2.00 % silicon, 0.05-0.50 % manganese, 0.05-0.60 % chromium and ≤ 0.0150 % phosphorus, with the remainder consisting of iron and inevitable impurities. At least 97% of the head surface, which has a depth of 10 mm using the surface of the head recess or the top of the head as a starting point, has a pearlite structure. The pearlite structure has a Vickers hardness of 320-500 Hv. Within the pearlite structure, the density of manganiferous cementite (CMn [at.%]) divided by the density of manganiferous ferrite (FMn [at.%]) gives a CMn/FMn value of 1.0-5.0.

UEDA Masaharu (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
上田　正治 (〒71 東京都千代田区丸の内二丁目６番１号　新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
TAKAHASHI Jun (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
高橋　淳 (〒71 東京都千代田区丸の内二丁目６番１号　新日本製鐵株式会社内 Tokyo, 〒1008071, JP)

JP2011/063020

December 15, 2011

June 07, 2011

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NIPPON STEEL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
新日本製鐵株式会社 (〒71 東京都千代田区丸の内二丁目６番１号 Tokyo, 〒1008071, JP)
UEDA Masaharu (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
上田　正治 (〒71 東京都千代田区丸の内二丁目６番１号　新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
TAKAHASHI Jun (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)

C22C38/00; B21B3/00; C21D8/00; C21D9/04; C22C38/34; C22C38/54

SHIGA Masatake et al. (1-9-2, Marunouchi Chiyoda-k, Tokyo 20, 〒1006620, JP)

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