Steel for electric power tower and production method thereof
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A power tower and molten steel technology, applied in the field of steel rolling, can solve problems such as low strength, difficult galvanizing, and low welding performance
Inactive Publication Date: 2012-02-01
SHOUGANG CORPORATION
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[0005] The purpose of the present invention is to overcome the problems of low strength, difficult galvanizing and low welding performance of the existing steel for power towers, and provide a high-strength, easy-to-galvanize, easy-weld steel for power towers and its production method
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Embodiment 1
[0032] The molten iron is subjected to KR desulfurization treatment, full three desulfurization converter smelting, and LF furnace refining treatment before continuous casting; the slab smelting composition is: C: 0.07wt%, Si: 0.02wt%, Mn: 1.10wt%, P : 0.010wt%, S: 0.003wt%, V: 0.04wt%, Ti: 0.035wt%, Alt: 0.035wt%, the balance is Fe and other unavoidable impurity elements.
[0033] The slab is heated to 1180°C, the heating time is 3.5 hours, the final rolling temperature is 820°C, and the coiling temperature is 620°C; after rough rolling, finishing rolling, and laminar cooling, coiling is carried out. Finally, GR.65 steel for power towers was obtained, with a yield strength of 560MPa, a tensile strength of 630MPa and an elongation of 31%, a thickness of 15.8mm, and a width of 1800mm.
Embodiment 2
[0035] The molten iron is subjected to KR desulfurization treatment, full three desulfurization converter smelting, and LF furnace refining treatment before continuous casting; the slab smelting composition is: C: 0.06wt%, Si: 0.03wt%, Mn: 1.20wt%, P : 0.008wt%, S: 0.003wt%, V: 0.036wt%, Ti: 0.032wt%, Alt: 0.040wt%, the balance is Fe and other unavoidable impurity elements.
[0036] The slab is heated to 1200°C, the heating time is 3.3 hours, the final rolling temperature is 840°C, and the coiling temperature is 650°C; after rough rolling, finish rolling, and laminar cooling, coiling is carried out. Finally, GR.65 steel for power towers was obtained, with a yield strength of 570MPa, a tensile strength of 680MPa, an elongation of 35%, a thickness of 3.2mm, and a width of 1200mm.
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Abstract
The invention discloses steel for an electric power tower, which comprises the following chemical components in percentage by weight: 0.04-0.10wt% of C, 0.01-0.10wt% of Si, 0.60-1.20wt% of Mn, less than 0.02wt% of P, less than 0.008wt% of S, 0.01-0.06wt% of V, 0.01-0.04wt% of Ti, more than 0.02wt% of Alt and the balance of Fe and inevitable impurity elements. The invention also discloses a method for producing the steel for the electric power tower. The invention has the characteristics that: on the basis of meeting the performance of the steel for the electric power tower, the surface quality of a hot-rolled steel coil is controlled through optimizing the chemical components, heating system, rolling process and the like of the steel for the electric power tower, thus the produced steel for the electric power tower has high strength, is easy to weld and is easy to coat, and the production cost can be lowered.
Description
technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a low-cost, easy-to-weld, easy-to-coat, high-strength steel for power towers and a production method thereof. Background technique [0002] With the rapid development of my country's economy, the demand for electricity in various regions is increasing, which makes the construction of my country's power grid unprecedentedly developed. With the need for long-distance and large-capacity power transmission, the voltage level has been continuously upgraded. The lines with 1000kV AC, ±800kV DC and ±1000kV DC UHV lines as the backbone network frame are under construction, and transmission towers have also developed from early wooden poles. It is a steel pipe structure tower. At the beginning of 2008, parts of East China, South China, and Southwest China suffered severe snowstorms, and many power grid towers collapsed and disconnected accidents, which seriously affect...
Claims
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