Thin-gauge Ni-free weathering steel produced based on CSP process and production method of thin-gauge Ni-free weathering steel

Abstract

The invention provides thin-gauge Ni-free weathering steel produced based on a CSP process and a production method of the thin-gauge Ni-free weathering steel. The thin-gauge Ni-free weathering steel comprises the following components: 0.04%-0.06% of C, 0.30%-0.55% of Si, 0.30%-0.80% of Mn, 0.020%-0.150% of P, less than or equal to 0.005% of S, 0.30%-0.80% of Cr, 0.25%-0.40% of Cu, 0.015%-0.040% of Als, 0.010%-0.040% of Ti and the balance of Fe and inevitable impurity elements. A proper amount of P and Si are added, through matching design and interaction of Si-P-Cu-Cr elements, the problems of continuous casting bleed-out and product surface crack defects caused by copper brittleness are solved, the manufacturing cost is reduced, and meanwhile good atmospheric corrosion resistance and strong plasticity matching are achieved.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, and in particular relates to a thin gauge Ni-free weathering steel produced based on a CSP process and a production method thereof. Background technique [0002] Weathering steel, also known as atmospheric corrosion-resistant steel, has less alloy content than stainless steel and lower manufacturing costs. Compared with ordinary carbon steel, it has good atmospheric corrosion resistance and is widely used in railway vehicles, containers, buildings, photovoltaic brackets and other industries. Cu can significantly improve the atmospheric corrosion resistance of steel. It is one of the main alloying elements added to weathering steel. However, its melting point is only 1083°C. Due to the existence of Cu, it is easy to cause breakout, billet heating and thermal Surface quality defects such as edge cracks occur during the rolling process. In the past, Cu and Ni were often added together in wea...

AI Technical Summary

Problems solved by technology

Although Ni was not added, no measures were proposed to solve copper brittle defects at high Cu content

And it is only used for container manufacturing, with a single purpose

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