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Medium-carbon medium-silicon niobium microalloyed high-speed wheel steel and wheel preparation method

A technology of microalloying and wheel steel, which is applied in the direction of manufacturing tools, heat treatment equipment, furnace types, etc., can solve the problems of poor adaptability, low strength and hardness of high-speed wheel steel, and achieve improved strength and toughness matching, high strength and hardness , The effect of improving wear performance

Active Publication Date: 2020-11-27
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of poor adaptability, low strength and low hardness of medium and high-speed wheel steel in the prior art, the present invention provides a niobium microalloyed high-speed wheel steel with medium carbon and medium silicon and a method for preparing the wheel

Method used

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  • Medium-carbon medium-silicon niobium microalloyed high-speed wheel steel and wheel preparation method
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  • Medium-carbon medium-silicon niobium microalloyed high-speed wheel steel and wheel preparation method

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preparation example Construction

[0040] A method for preparing a medium carbon medium silicon niobium microalloyed high-speed wheel using the above-mentioned medium carbon medium silicon niobium microalloyed high-speed wheel steel, comprising a heat treatment process, the heat treatment process comprising the following steps:

[0041] S1: The wheel is heated at a temperature of 860-890°C, and kept warm for 2.0-3.5 hours after heating; if the heating temperature exceeds 890°C, the austenite grains will grow significantly, which has a great impact on the toughness index of the wheel;

[0042] S2: Spray water to cool the wheels after heat preservation; specifically, place the heat-preserved wheels in step S1 horizontally on the wheel cooling platform, and at the same time, the wheels move clockwise on the wheel cooling platform at a speed of 20r / min to 30r / min Autobiography, and use the nozzle on the wheel cooling platform to spray water to cool the wheel, so that the metal inside the wheel can be cooled to below...

Embodiment 1

[0046] A niobium microalloyed high-speed wheel steel with medium carbon and silicon, comprising the following components in weight percentage: C: 0.53%, Si: 0.55%, Mn: 0.70%, Nb: 0.02%, P: 0.005%, S0 .007%, the rest is Fe and unavoidable impurity elements; the preparation method of the wheel is as follows: the molten steel containing the above components is passed through the electric furnace steelmaking process, the LF furnace refining process, the RH vacuum treatment process, the round billet continuous casting process, and the cutting process. Ingot rolling process, heat treatment process, processing process and finished product inspection process to form niobium microalloyed high-speed wheels with medium carbon and silicon. Spray water to cool the metal inside the wheel at a cooling rate of 2°C / s-5°C / s to below 550°C, and finally temper at 520°C for 5.0 hours. As a comparative example of the present invention, in this implementation, the composition of ER8 wheel steel incl...

Embodiment 2

[0050] A niobium microalloyed high-speed wheel steel with medium carbon and silicon, comprising the following components in weight percentage: C: 0.54%, Si: 0.60%, Mn: 0.65%, Nb: 0.03%, P: 0.005%, S0 .006%, the rest is Fe and unavoidable impurity elements; the preparation method of the wheel is as follows: the molten steel containing the above components is passed through the electric furnace steelmaking process, the LF furnace refining process, the RH vacuum treatment process, the round billet continuous casting process, and the cutting process. Ingot rolling process, heat treatment process, processing process, and finished product testing process to form niobium microalloyed high-speed wheels with medium carbon and silicon. Water spray cooling, so that the inner metal of the wheel is cooled to below 550°C at a cooling rate of 2°C / s-5°C / s, and finally tempered at 540°C for 5.5 hours. In this implementation, the composition of the ER8 wheel steel is consistent with that of Exa...

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Abstract

The invention discloses medium-carbon medium-silicon niobium microalloyed high-speed wheel steel and a wheel preparation method, and belongs to the field of railway wheel preparation. Aiming at the problems that in the prior art, high-speed wheel steel is poor in adaptability and low in strength and hardness, the invention provides medium-carbon medium-silicon niobium microalloyed high-speed wheelsteel. The steel comprises the following components in percentage by weight: 0.50%-0.58% of C, 0.50%-0.80% of Si, 0.50%-0.90% of Mn, 0.02%-0.04% of Nb, no greater than 0.015% of P, no greater than 0.015% of S and the balance of Fe and inevitable impurity elements. The niobium element is added into the components of the wheel steel; niobium and carbon are combined to form niobium carbide, the effect of refining pearlite groups is achieved during steel rolling and heat treatment, meanwhile, it is guaranteed that a certain amount of ferrite is separated out, the strength and toughness matching of the wheel steel is improved, the strength and hardness level is improved by 5% or above compared with an ER8 wheel, and the contact fatigue resistance and wear resistance are also improved. According to the preparation method disclosed by the invention, heat treatment is subjected to process optimization, so that the adaptability of the wheel is further improved, and the wheel has relatively high strength and hardness.

Description

technical field [0001] The invention belongs to the technical field of railway wheel preparation, and more specifically relates to a niobium microalloyed high-speed wheel steel with medium carbon and silicon and a method for preparing the wheel. Background technique [0002] my country's high-speed railway development has achieved world-renowned achievements, and the key components of high-speed trains have also achieved independent innovation. At present, my country's high-speed wheels are mainly ER8 wheels in the European standard EN13262, which are made of medium-carbon carbon steel and have high fracture toughness (≥70MPa m 1 / 2 ) to ensure service safety. The structure of ER8 wheel is a small amount of discontinuous reticular ferrite + lamellar pearlite, in which ferrite is a soft phase with good toughness and low yield strength, and pearlite has high strength but poor toughness. The matching relationship determines the final performance of the material. The yield str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C21D9/34C21D1/18
CPCC22C38/02C22C38/04C22C38/12C21D9/34C21D1/18C21D2211/009C21D2211/005C21D2211/002
Inventor 赵海丁毅江波刘学华张明如
Owner MAANSHAN IRON & STEEL CO LTD
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