Q355NE round steel for rail transit braking vertical plate and production method of Q355NE round steel

By adjusting the chemical composition and adding alloy elements of Q355NE round steel, the problems of insufficient low-temperature toughness and excessive carbon equivalent are solved, and the strength and low-temperature performance requirements of the rail transit brake vertical plate are achieved, improving product quality and vehicle safety.

CN119710475APending Publication Date: 2025-03-28WUHU XINXING DUCTILE IRON PIPES
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Patent Information

Application Number
CN202411915118.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing Q355NE round steel has insufficient toughness in low-temperature environments and its carbon equivalent exceeds 0.44, making it difficult to meet the strength and low-temperature performance requirements of rail transit brake vertical plates.

Method used

By adjusting the chemical composition, ensure that the carbon equivalent is below 0.44, and the Nb, V, and Cr alloy elements are added at the same time to expand the austenite non-recrystallization zone, prevent the grain from growing, and control grain refinement through rolling and normalized heat treatment to improve the strength and toughness of the material.

Benefits of technology

It achieves excellent toughness of Q355NE round steel at low temperatures, and meets the strength and low-temperature impact toughness index requirements of rail transit brake vertical plates, improves product quality, and ensures the safe driving of the vehicle.

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Abstract

The invention discloses Q355NE round steel for a rail transit braking vertical plate and a production method of the Q355NE round steel. The Q355NE round steel comprises the following chemical components in percentage by weight: 0.15%-0.17% of C, 0.20%-0.30% of Si, 1.35%-1.45% of Mn, 0.05%-0.10% of Cr, 0.01%-0.03% of Nb, 0.02%-0.04% of V and the balance of Fe and inevitable impurities. The Q355NE round steel has excellent low-temperature toughness while meeting the requirement that the low-carbon equivalent is smaller than or equal to 0.44; reH is 320-335 Mpa, Rm is 485-525 Mpa, A is 30-35%, and impact energy KV at-40 DEG C is 2210-235 J, which is superior to index requirements of a rail transit brake vertical plate, and safe driving of a vehicle can be guaranteed.
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