High-performance bridge weathering steel containing Mo and preparation method thereof

Abstract

The invention belongs to the field of manufacture of low-alloy steel, in particular to high-performance bridge weathering steel containing Mo and a preparation method thereof. The invention provides bridge weathering steel containing Mo with the high performance, which comprises the following chemical components by mass percent: 0.02-0.05 percent of C, 0.20-0.30 percent of Si, 1.0-1.50 percent of Mn, at most 0.02 percent of P, at most 0.010 percent of S, 0.20-0.40 percent of Cu, 0.40-0.60 percent of Cr, 0.20-0.40 percent of Ni, 0.1-0.30 percent of Mo, 0.04-0.07 percent of Nb, 0.005-0.015 percent of Ti, at most 0.02 percent of Al and the balance of Fe and inevitable impurities. The high-performance bridge weathering steel containing Mo adopts two stages of rolling. The rough rolling and bloom rolling temperature of the first stage is 1050-1070 DEG C, the precision rolling and bloom rolling temperature of the second stage is 900-950 DEG C, and the finish rolling temperature is 800-850 DEG C. The high-performance bridge weathering steel containing Mo disclosed by the invention has good mechanical property, welding performance and atmospheric-corrosion resistance performance. The high-performance bridge weathering steel containing Mo adopts an Ultra-low carbon design, and the production cost is low.

Description

technical field [0001] The invention belongs to the field of low-alloy steel manufacturing, and in particular relates to a Mo-containing high-performance bridge weathering steel and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of my country's economy, the state has increased investment in the transportation industry, and the construction of various bridges has also driven the demand for bridge steel. These projects have increased the demand for bridge steel. The performance of bridge steel also puts forward higher requirements, not only requiring it to have high strength, toughness and good welding performance, but also requiring it to have certain weather resistance. Traditional high-strength bridge steel not only has poor impact toughness, weldability and fatigue resistance, but also cannot withstand atmospheric and seawater corrosion. Therefore, material workers at home and abroad have proposed the concept of high-...

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Problems solved by technology

[0008] Aiming at the disadvantages of existing bridge steels, such as poor mechanical properties, poor welding performance and atmospheric corrosion resistance, and high C content, the present invention provides Mo-containing high-performance Bridge weathering steel and its preparation method. The strength level of the bridge steel of the present invention is higher than that of traditional bridge steel. Adopt ultra-low carbon design