Rolling temperature control method for eliminating red rust on surface of hot-rolled coiled plate weathering resistant steel

Abstract

The invention discloses a rolling temperature control method for eliminating red rust on the surface of hot-rolled coiled plate weathering resistant steel. The rolling temperature control method comprises the following steps of (1) heating temperature control, (2) control over temperature and thickness of a rough rolling intermediate billet, (2) precision rolling and finish rolling temperature control, and (4) coiling temperature control. According to the hot-rolled coiled plate weathering resistant steel, the billet thickness is 200 mm, the thickness of finished products ranges from 2.0 mm to14.0 mm, the finished products are divided into four stages of 2.0<=t<=3.5 mm, 3.5<t<=6.0 mm, 6.0<t<=8.0 mm and 8.0<t<=14.0 mm to control rolling temperature, the rolling temperature is optimized byreasonably controlling the heating temperature, the temperature and thickeness of the rough rolling intermediate billet, the finish rolling temperature and the coiling temperature, red rust on the surface of the high-Si-content hot-rolled coiled plate weathering resistant steel is eliminated, and the surface quality of the hot-rolled coiled plate weathering resistant steel is improved.

Description

technical field [0001] The invention belongs to the technical field of rolling, and in particular relates to a rolling temperature control method for eliminating red rust on the surface of hot-rolled coil weathering steel. Background technique [0002] Weathering steel, that is, atmospheric corrosion-resistant steel, is a low-alloy high-strength steel with good corrosion resistance in the atmosphere. During use, the surface will gradually form a layer of dense and firmly adhered corrosion product protective film to prevent further corrosion of the substrate by oxygen, water and other corrosive media in the atmosphere, making its corrosion rate greatly lower than that of carbon steel, so it is widely used Used in railways, containers, bridges and marine engineering and other fields. [0003] In order to improve the corrosion resistance of weathering steel, it is often necessary to add Si, Cu, P, Cr, Ni and other corrosion-resistant alloy elements to ensure its good corrosion...

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Problems solved by technology

[0003] In order to improve the corrosion resistance of weathering steel, it is often necessary to add Si, Cu, P, Cr, Ni and other corrosion-resistant alloy elements to ensure its good corrosion resistance. In order to reduce the production cost, the Si content of the weathering steel is often increased to control the lower Cu, P, and Cr contents to meet the corrosion resistance. Due to the increase of the Si content, the surface of the low-cost hot-rolled weathering steel is easy to form strips or sheets. Shaped red rust affects the surface quality of hot-rolled weathering steel

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