Weather-resistant hot rolled narrow steel strip and method for manufacturing same

Abstract

The present invention relates to one kind of weather resistant hot roller narrow steel strip for welded structure and its production process. The steel strip has the chemical composition comprising C 0.07-0.12 wt%, Si 0.25-0.50 wt%, Mn 0.30-0.50 wt%, P 0.07-0.15 wt%, S less than 0.035 wt%, Cu 0.25-0.40 wt%, Cr 0.30-1.2 wt%, Ni 0.10-0.50 wt%, and Fe and inevitable impurity for the rest. It is produced through smelting in a top blown converter, LF refining, continuously casting steel strip billet and hot rolling in a continuous rolling mill train. It has high purity, excellent corrosion resistance, excellent welding performance and homogeneous mechanical performance. It may be applied in making square welded tube or other accessories for container.

Description

technical field The invention relates to weather-resistant steel and a manufacturing method thereof, belonging to the technical field of low-alloy steel, in particular to a weather-resistant hot-rolled narrow steel strip for container welding components and a manufacturing method thereof. Background technique Weathering steel is a general term for a class of steel resistant to atmospheric corrosion. The existing technology generally uses a large amount of alloying elements such as Cu, P, Cr, Ni, Al, etc. to the steel, and some also add As, Ce, Co, Ti, V and other elements to improve the weather resistance of steel and obtain proper strength. Chinese patent document CN1752260, application number 200510012897.0 discloses a "hot-rolled dual-phase weathering steel plate and its manufacturing method". C, 0.05-0.15% P, 0.1-0.4% Cu, Cr, Ni, Ti, V, Nb and other elements, the tensile strength is greater than 680MPa, the yield strength is greater than 360MPa, the elongation is greate...

AI Technical Summary

Problems solved by technology

Although the weather-resistant steel provided in the above patent documents improves the performance of the steel, the cost is too high, and the production process is complicated, so it is difficult to market

Images