Preparation method of rail steel

A technology for rail steel and molten steel, which is applied in the field of rail steel and the preparation of the rail steel, can solve the problem that the rail just cannot meet the quality requirements, and achieves the effects of facilitating production organization, improving the cleanliness of molten steel, and continuous and stable production.
CN101948983BInactive Publication Date: 2012-06-06PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
Publication Date
2012-06-06
Estimated Expiration
Not applicable · inactive patent
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Abstract

The invention relates to a rail steel and a preparation method thereof. The rail steel contains the following components by taking the total weight of the rail steel as reference 0.65-0.75wt% of C, 0.80-1.30wt% of Mn, 0.10-0.50wt% of Si, less than or equal to 0.03wt% of V, less than or equal to 0.025wt% of P, 0.008-0.025wt% of S, less than or equal to 0.004wt% of Al, the balance of iron. Cleanliness of the rail steel is indicated by the grade of T(O) content, (H) content and contents of nonmetallic inclusions A, B, C and D, wherein total oxygen content T(O) in the rail steel is less than or equal to 0.0020wt%, (H) content is less than or equal to 0.0002wt%, and according to inclusion rating standard GB / T10561-2005, the inclusion A in the rail steel is less than or equal to 1.5 grade, the inclusion B is less than or equal to 1.0 grade, inclusion C is less than or equal to 1.0 grade, and the inclusion D is less than or equal to 1.0 grade. The rail steel for high speed railway provided by the invention has low inclusion content, low (H) content and low T(O) content, and the aim of effectively improving cleanliness of molten steel of rail steel is realized.
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Description

technical field

[0001] The invention relates to a rail steel and a preparation method of the rail steel. Background technique

[0002] With the advancement of high-speed railway transportation and the construction of an intercity high-speed railway network with a speed of 350 km / h, in order to ensure the safety and comfort of train operation, more stringent quality requirements have been put forward for rail steel used in high-speed railways. Requirements, generally require that T[O]≤20×10 in rail steel -6 、[H]≤1.5×10 -6 , [Al]s≤0.004%, and the content levels of the four types of inclusions of type A, type B, type C and type D are not greater than level 2.0, level 1.0, level 1.0 and level 1.0 respectively. However, the quality of the rail steel produced by the ordinary rail steel production method is difficult to meet the requirements of 350 km / h high-speed rail steel, and the product qualification rate is only about 40%, so it is difficult to realize mass production. The...

Claims

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