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Medium-carbon niobium-vanadium microalloying high-speed wheel steel and wheel preparation method

A niobium-vanadium micro-alloy and wheel steel technology, which is applied in the manufacture of tools, heat treatment equipment, furnace types, etc., can solve the problems of poor adaptability, low strength and hardness, etc., achieve improved wear performance, increased hardness level, and improved material properties Effect

Inactive Publication Date: 2020-11-20
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of poor adaptability, low strength and hardness of high-speed wheel steel in the prior art

Method used

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  • Medium-carbon niobium-vanadium microalloying high-speed wheel steel and wheel preparation method

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preparation example Construction

[0041] A method for preparing a medium-carbon niobium-vanadium micro-alloyed high-speed wheel steel using the above-mentioned medium-carbon niobium-vanadium micro-alloyed high-speed wheel steel, including a heat treatment process, and the heat treatment process includes the following steps:

[0042] S1: The wheel is kept warm for 2.0-3.5 hours at a temperature of 850-880°C; the main reason is that Nb and V elements are added. In order to fully exert the effects of Nb and V, it is necessary to increase the heating temperature so that the second phase particles formed are solid-dissolved in the in austenite. When the content of Nb and V is lower than the line, the temperature is 850°C. With the increase of Nb and V content, the temperature increases, but when the temperature exceeds 880°C, the austenite grains will grow significantly. Therefore, the heat treatment temperature is designed at 850-880°C;

[0043] S2: Spray water to cool the wheels after heat preservation; specific...

Embodiment 1

[0047] A medium-carbon niobium-vanadium microalloyed high-speed wheel steel, including the following components in weight percentage: C: 0.52%, Si: 0.25%, Mn: 0.65%, P: 0.003%, S: 0.005%, Nb: 0.01%, V: 0.20%, and the rest are 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, and the round billet continuous process. Casting process, ingot cutting and rolling process, heat treatment process, processing process, and finished product inspection process. The heat treatment process is: firstly, heat at 860 ° C, keep warm after heating, and after 2.5 hours of heat preservation, the wheels are sprayed with water to cool down. 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 500°C for 4.5 hours. As a comparative e...

Embodiment 2

[0051] A medium-carbon niobium-vanadium microalloyed high-speed wheel steel, including the following components in weight percentage: C: 0.54%, Si: 0.30%, Mn: 0.65%, P: 0.003%, S: 0.006%, Nb: 0.02%, V: 0.15%, and the rest are 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, and the round billet continuous process. It is formed by casting process, ingot cutting and rolling process, heat treatment process, processing process and finished product testing process. The heat treatment process is as follows: first heat at 870°C, heat it after heating, keep it warm for 3.0 hours, spray the wheel with water to cool it, and accelerate the cooling of the metal inside the wheel to 550°C at a cooling rate of 2°C / s-5°C / s Thereafter, a final tempering treatment was performed at 50...

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Abstract

The invention discloses medium-carbon niobium-vanadium microalloying high-speed wheel steel and a wheel preparation method, and belongs to the field of railway wheel preparation. The medium-carbon niobium-vanadium microalloying high-speed wheel steel aims to solve the problems of poor adaptability and low strength and hardness of high-speed wheel steel in the prior art. The medium-carbon niobium-vanadium microalloying high-speed wheel steel comprises the following components of, by weight, 0.52%-0.56% of C, 0.15%-0.40% of Si, 0.50%-0.80% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.015% of S, 0.01%-0.03% of Nb, 0.10%-0.20% of V and the balance Fe and inevitable impurity elements. According to the medium-carbon niobium-vanadium microalloying high-speed wheel steeland the wheel preparation method, Nb and V elements are added to form a brand new component design system, and a corresponding heat treatment process is matched, so that the strength and hardness levels of a wheel are improved by more than 5% compared with those of an ER8 wheel on the premise that the toughness index of the wheel is not reduced, the contact fatigue resistance and the wear resistance are also improved, and the adaptability of the wheel is stronger.

Description

technical field [0001] The invention belongs to the technical field of railway wheel preparation, and more specifically relates to a medium-carbon niobium vanadium microalloyed high-speed wheel steel 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 strength of...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C21D1/18C21D9/34
CPCC21D1/18C21D9/34C22C38/002C22C38/02C22C38/04C22C38/12
Inventor 赵海江波丁毅刘学华张明如
Owner MAANSHAN IRON & STEEL CO LTD
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