Development of SP4 Rail with High Performance Pearlitic for Heavy Haul Railways

oleh "Kazuya Tokunaga, Tsurukazu Arimura, Moriyasu Yamaguchi, Hiroyuki Fukuda, Minoru Honjo, Ryo Matsuoka, Mineyasu Takemasa"

Penerbit - JFE Steel Corporation, Japan

Kategori - Kejuruteraan & IT

"JFE Steel has developed a high performance pearlitic rail (SP4) with excellent wear resistance and rolling contact fatigue (RCF) resistance for heavy haul railways. Excellent wear and RCF resistances were realized in SP4 rail with a suitable alloy design and optimum production conditions, including the thermo-mechanical controlled processing. The microstructure in the rail head is fully pearlite with an extremely fine lamellar spacing. Features of the SP4 rail were the surface hardness of 450 in Brinell scale (HB450) and the higher level of hardness than HB400 even at a depth of 0.9 inches from the rail head surface. The tensile and 0.2% yield strengths were approximately 1500MPa and 1000MPa respectively, which were higher than HB370 heattreated class rail (HB370 class rail).In addition, the elongation of SP4 rail was approximately 12%, which was on the same level as that of HB370 class rail."

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