Weather-resistant hot rolled narrow steel strip and method for manufacturing same
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A manufacturing method and technology for narrow steel strips, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve the problems of high cost, complex production process, difficulty in marketization, etc., and achieve high production efficiency and reduce manufacturing costs. , Good effect of atmospheric corrosion resistance
Inactive Publication Date: 2008-03-05
LAIWU IRON & STEEL GRP
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Although the weather-resistant steel provided in the above patent documents improves the performance of
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[0024] The present invention will be further described below in conjunction with the examples, but not limited thereto. Embodiment 1. The specification is a steel strip of 3.0mm×285mm, and the specification of the billet is 120mm×285mm.
[0025] 1. The chemical composition of steel is as follows by weight percentage:
[0026] C: 0.10%, Si: 0.33%, Mn: 0.38%, P: 0.100%, S: 0.021%, Cu: 0.30%, Cr: 0.53%, Ni: 0.12%, and the rest are Fe and unavoidable impurities.
[0027] 2. Manufacturing method of weather-resistant hot-rolled narrow steel strip
[0028] The process route is as follows:
[0029] Hot metal pretreatment - 40t top-blown converter smelting - LF ladle refining belt billet continuous casting - 500mm full hot continuous rolling mill rolling.
[0030]The pre-desulfurization of molten iron is to spray and passivate magnesium particles in the molten iron tank, so that the sulfur in the molten iron is controlled below 0.025%, the temperature is not lower than 1250°C, and t...
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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 [0001] 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 [0002] 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 elon...
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