A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
BAINITIC STEEL RAIL
PROBLEM TO BE SOLVED: To stably provide a rail having high hardness in a bainitic steel rail.SOLUTION: Provided is a bainitic steel rail having a chemical composition containing, by mass, 0.15 to 0.45% C, 0.05 to 2.00% Si, 0.10 to 2.00% Mn, 0.10 to 2.00% Cr and 0.0005 to 0.0050% Nb, in which the content of P is limited to 0.025% or lower and the content of S is limited to 0.025% or lower, and the balance Fe with inevitable impurities, in which a Bm value calculated by formula (1) satisfies inequality (2), and 95% or higher in area% being a bainite structure at least in the range of a depth of 20 mm with the heat corner part of the rail and the heat tip surface as starting points, and the average hardness of the above range lies in the range of 300 to 500 Hv:Bm=(0.06+0.5×C)×(1+1.1×Si)×(1+3.5×Mn)×(1+6.4×Cr)(1) and 85≥Bm≥1(2).SELECTED DRAWING: None
【課題】ベイナイト鋼レールにおいて、高硬度を有するレールを安定的に提供する。【解決手段】化学組成が、質量％で、Ｃ：０．１５〜０．４５％、Ｓｉ：０．０５〜２．００％、Ｍｎ：０．１０〜２．００％、Ｃｒ：０．１０〜２．００％、Ｎｂ：０．０００５〜０．００５０％を含有し、Ｐ：０．０２５％以下、Ｓ：０．０２５％以下に制限し、残部Ｆｅおよび不可避的不純物であり、下記式（１）で計算されるＢｍ値が下記式（２）を満足し、レールの頭部コーナー部および頭頂部表面を起点として少なくとも深さ２０ｍｍの範囲において、面積％で、９５％以上がベイナイト組織であり、前記範囲の平均硬度が３００〜５００Ｈｖの範囲であることを特徴とするベイナイト鋼レール。Ｂｍ＝（０．０６＋０．５×Ｃ）×（１＋１．１×Ｓｉ）×（１＋３．５×Ｍｎ）×（１＋６．４×Ｃｒ） ・・・（１）８５≧Ｂｍ≧１ ・・・（２）【選択図】なし
BAINITIC STEEL RAIL
PROBLEM TO BE SOLVED: To stably provide a rail having high hardness in a bainitic steel rail.SOLUTION: Provided is a bainitic steel rail having a chemical composition containing, by mass, 0.15 to 0.45% C, 0.05 to 2.00% Si, 0.10 to 2.00% Mn, 0.10 to 2.00% Cr and 0.0005 to 0.0050% Nb, in which the content of P is limited to 0.025% or lower and the content of S is limited to 0.025% or lower, and the balance Fe with inevitable impurities, in which a Bm value calculated by formula (1) satisfies inequality (2), and 95% or higher in area% being a bainite structure at least in the range of a depth of 20 mm with the heat corner part of the rail and the heat tip surface as starting points, and the average hardness of the above range lies in the range of 300 to 500 Hv:Bm=(0.06+0.5×C)×(1+1.1×Si)×(1+3.5×Mn)×(1+6.4×Cr)(1) and 85≥Bm≥1(2).SELECTED DRAWING: None
【課題】ベイナイト鋼レールにおいて、高硬度を有するレールを安定的に提供する。【解決手段】化学組成が、質量％で、Ｃ：０．１５〜０．４５％、Ｓｉ：０．０５〜２．００％、Ｍｎ：０．１０〜２．００％、Ｃｒ：０．１０〜２．００％、Ｎｂ：０．０００５〜０．００５０％を含有し、Ｐ：０．０２５％以下、Ｓ：０．０２５％以下に制限し、残部Ｆｅおよび不可避的不純物であり、下記式（１）で計算されるＢｍ値が下記式（２）を満足し、レールの頭部コーナー部および頭頂部表面を起点として少なくとも深さ２０ｍｍの範囲において、面積％で、９５％以上がベイナイト組織であり、前記範囲の平均硬度が３００〜５００Ｈｖの範囲であることを特徴とするベイナイト鋼レール。Ｂｍ＝（０．０６＋０．５×Ｃ）×（１＋１．１×Ｓｉ）×（１＋３．５×Ｍｎ）×（１＋６．４×Ｃｒ） ・・・（１）８５≧Ｂｍ≧１ ・・・（２）【選択図】なし
BAINITIC STEEL RAIL
ベイナイト鋼レール
MIYAZAKI TERUHISA (author) / UEDA MASAHARU (author)
2016-09-01
Patent
Electronic Resource
Japanese
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