Low-temperature resistant low-alloy structural steel and manufacturing method thereof
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A low-alloy and structural steel technology, applied in the field of low-carbon micro-alloyed steel, can solve the problem that the steel grade requirements cannot meet the current situation of steel used in wind power towers
Active Publication Date: 2016-08-24
LAIWU IRON & STEEL GRP
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[0004] The main purpose of the present invention is to design a continuous casting round billet and production method for forging flanges of wind power towers, which can meet the requirements of low temperature impact resistance in view of the current situation that the steel grade requirements in the existing standard series cannot meet the steel requirements for wind power towers. Performance (-50°C) and internal quality requirements
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[0031] The present invention will be further described below in conjunction with embodiment.
[0032] A low-temperature-resistant low-alloy structural steel and a manufacturing method thereof. The method adopts UHP ultra-high-power electric furnace, LF external refining, and VD vacuum degassing treatment process for smelting, and continuously casts round billets to produce steel products.
[0033] The production process includes:
[0034] (1) Smelting
[0035] The electric furnace is used for smelting, and the raw materials for electric furnace smelting are high-quality medium-heavy high-quality scrap steel and molten iron, and the proportion of molten iron is 62-65%. In order to ensure that the harmful elements of P and Ti in the steel are as low as possible, the early stage of electric furnace smelting makes full use of the favorable conditions of lower temperature in the melting period to improve the oxidation of the primary slag, and the dephosphorization and titanium remov...
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Abstract
The invention discloses low-temperature resistant low-alloy structural steel. The low-temperature resistant low-alloy structural steel comprises the following ingredients in percentage by mass: 0.13-0.20% of C, 0.15-0.55% of Si, 1.00-1.75% of Mn, not higher than 0.015 of P, not higher than 0.005 of S, 0.02-0.12% of V, 0.015-0.050% of Nb, 0.010-0.035% of Als, 0.020-0.050% of Re, not higher than 0.010% of Ti, not higher than 0.35% of Cr, not higher than 0.55% of Ni, not higher than 0.15% of Cu, not higher than 0.020% of As, not higher than 0.020% of Sn, not higher than 0.0025% of Pb, not higher than 0.025% of Sb, not higher than 0.005% of Bi, not higher than 15ppm of [O], not higher than 2.0ppm of [H] and the balance of Fe and unavoidable impurities. A wind power generator tower tube flange, which is manufactured through forging a steel billet prepared from the steel, has the advantages that the mechanical properties are stable, the low-temperature impact property is excellent, and the internal quality is excellent.
Description
technical field [0001] The invention belongs to the technical field of low-carbon micro-alloy steel, and in particular relates to a low-alloy structural steel with excellent low-temperature toughness and a manufacturing method thereof. Background technique [0002] The wind energy resources on the earth are 10 times that of the earth's water energy resources, and the annual power generation is as high as 53 trillion kwh. In terms of distribution, wind energy resources are mainly distributed in North America, Asia, Latin America and other places. Asia, North America and Europe will become the main regions with rapid wind power development in the next five years. The growth rate of wind power in Asia will be far ahead in the world, and China will still be the main driving force for the growth of the wind power market. The main components of wind turbines include towers, nacelle bases, tower flanges and door frames, wind turbines, main shafts, bearings, gears and blades, etc. ...
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