Bainite steel wheel for rail traffic D-series high-speed train and manufacturing method thereof

Abstract

The invention discloses a bainite steel wheel for a rail traffic D-series high-speed train and a manufacturing method thereof. Chemical components of the bainite steel wheel comprise 0.05-0.30% of C,0.10-1.50% of Ni, 0.01-1.20% of Cr, 0.70-2.10% of Mn, 0.20-1.00% of Si, 0.01-1.00% of W, 0.05-0.60% of Mo, 0.01-0.80% of Cu, 0.01-0.20% of V, 0.001-0.20% of Nb, 0.0001-0.0350% of B, 0.001-0.040% of RE, smaller than or equal to 0.020% of P, smaller than or equal to 0.020% of S and the balance Fe and inevitable residual elements, and the sum of Mn and Cr is larger than or equal to 2.0% and smaller than or equal to 3.0%. According to the bainite steel wheel, the novel C-Ni-Mn-Cr-Mo alloy design system and the alloying principle are adopted, after the wheel is formed and subjected to advanced heattreatment, a rim obtains a no-carbide bainite structure, and the wheel has excellent comprehensive mechanical performance, anticorrosion performance and service performance, and especially has the beneficial effects of being high in strength, high in hardness, high in toughness, high in low-temperature toughness, high in wheeltrack rolling contact fatigue resisting performance (RCF), high in heatcrack resisting performance and the like.

Description

technical field [0001] The invention belongs to the technical field of rail transit, and relates to a bainitic steel wheel for a rail transit EMU and a manufacturing method thereof, in particular to a carbide-free bainitic wheel for a high-speed train with an axle load of ≤18t and a running speed of 200-350km / h Body steel wheel and method of manufacture thereof. Background technique [0002] Wheels are the "shoes" of rail transit and one of the most important walking parts, which directly affects the safety of operation, especially for high-speed wheels, which have strict requirements on the toughness index in order to ensure the safety of operation. There are differences between my country's railway lines and other countries. The maximum service temperature difference between the north and the south is over 80°C, the lowest winter temperature in the north is below minus 40°C, and the south is highly corrosive due to humid heat, which has more stringent requirements for whee...

AI Technical Summary

Problems solved by technology

[0004] High-speed wheels put forward strict requirements on internal inclusions and ultrasonically detectable defects, in order to prevent the generation of crack sources under high-speed running conditions, but the detection of internal non-metallic inclusions is random, and super-detection can find The defects are basically millimeter level

This may lead to the risk of missed detection of inclusions with a size above 50um. Under high-speed operation, especially brittle oxide inclusions are the source of cracks. If the fracture toughness is not high, it is easy to expand and crack, causing traffic safety accidents.

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