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A high-aluminum ferritic heat-resistant steel
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A high-alumina ferritic, heat-resistant steel technology, applied in the field of ferritic heat-resistant steel, can solve the problems of high cost, poor thermal conductivity and thermal expansion performance, and achieve enhanced bonding force, good high temperature oxidation resistance, high resistance to The effect of high temperature oxidation performance
Inactive Publication Date: 2011-12-07
WUHAN UNIV OF SCI & TECH
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Problems solved by technology
At present, although there are surface Al that can be generated during high temperature oxidation 2 o 3 The technology disclosure of the manufacturing method of the heat-resistant steel of passive film (CN1179477A, US2008 / 0163957 A1 and US7744813 B2), but all is austenitic heat-resistant steel, wherein nickel content is up to more than 20%, and cost is expensive, and austenitic Steel is a kind of steel whose crystal structure is essentially different from ferritic steel, and its thermal conductivity and thermal expansion performance are worse than ferritic steel
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Embodiment 1
[0017] A high-aluminum ferritic heat-resistant steel. Its chemical composition and mass percentage content are: Cr is 9-11wt%, Co is 3-4wt%, W is 3-4wt%, Mo is 0.5-1wt%, Al is 2-2.5wt%, Nb is 0.01 ~0.1wt%, V is 0.6~0.8wt%, C is 0.001~0.005wt%, N is 0.03~0.05wt%, B is 0.001~0.005wt%, Si is 0.1~0.3wt%, Ti is 0.01~0.05wt% wt%, the balance is iron and unavoidable impurities.
[0018] The preparation method of the high-aluminum ferritic heat-resistant steel of this embodiment is to carry out batching according to the chemical composition of the heat-resistant steel and its mass percentage content, add it to a vacuum induction furnace for melting, and then cast it into a steel ingot. It is made into plates or bars by hot rolling or hot forging; then normalized at 1050-1100°C for 1-1.5 hours, then tempered at 780-800°C for 1-1.5 hours, and furnace cooled, that is High-aluminum ferritic heat-resistant steel.
Embodiment 2
[0020] A high-aluminum ferritic heat-resistant steel. Its chemical composition and mass percentage content are: Cr is 10-12wt%, Co is 4-5wt%, W is 2-3wt%, Mo is 1-2wt%, Al is 2.5-3wt%, and Nb is 0.1-3wt%. 0.3wt%, V 0.3~0.6wt%, C 0.005~0.01wt%, N 0.01~0.03wt%, B 0.004~0.008wt%, Si 0.2~0.3wt%, Ti 0.05~0.07wt% %, Ta is 0.01-0.1wt%, Hf is 0.001-0.01wt%, and the balance is iron and unavoidable impurities.
[0021] The preparation method of the high-aluminum ferritic heat-resistant steel of this embodiment is the same as that of Embodiment 1.
Embodiment 3
[0023] A high-aluminum ferritic heat-resistant steel. Its chemical composition and mass percentage content are: Cr is 12-14wt%, Co is 2-3wt%, W is 1-2wt%, Mo is 2-3wt%, Al is 3-3.5wt%, Nb is 0.3 ~0.5wt%, V is 0.2~0.3wt%, C is 0.01~0.04wt%, N is 0.005~0.01wt%, B is 0.008~0.01wt%, Si is 0.3~0.4wt%, Ti is 0.07~0.08 wt%, Ta is 0.1-0.3wt%, Ce is 0.01-0.06wt%, and the balance is iron and unavoidable impurities.
[0024] The preparation method of the high-aluminum ferritic heat-resistant steel of this embodiment is the same as that of Embodiment 1.
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Abstract
The invention relates to a high-Al ferritic heat-resistant steel. The technical scheme is as follows: the heat-resistant steel comprises the following chemical components: 9-15wt% of Cr, 1-5wt% of Co, 0.5-4wt% of W, 0.5-4wt% of Mo, 2-4wt% of Al, 0.01-0.9wt% of Nb, 0.1-0.8wt% of V, 0.001-0.08wt% of C, 0.001-0.05wt% of N, 0.001-0.02wt% of B, 0.1-0.4wt% of Si, 0.01-0.1wt% of Ti, 0-0.5wt% of Ta, 0-0.1wt% of RE or Hf and the balance of iron and inevitable impurities, wherein RE is Y or Ce. The high-Al ferritic heat-resistant steel is prepared through the following steps: proportioning according to the chemical components and contents, adding into a vacuum induction furnace for melting, then casting into a steel ingot, and hot-rolling or hot-forging to obtain a sheet or a bar; and normalizing at the temperature of 1050-1100 DEG C for 1-1.5 hours, tempering at the temperature of 780-800 DEG C for 1-1.5 hours and cooling along with the furnace. The high-Al ferritic heat-resistant steel provided by the invention has the characteristics of low cost, high-temperature oxidation resistance and high-temperature creep resistance.
Description
technical field [0001] The invention belongs to the technical field of ferritic heat-resistant steel, and in particular relates to a high-aluminum ferritic heat-resistant steel. Background technique [0002] In order to significantly reduce fuel consumption, save energy, and reduce CO 2 and other harmful gas emissions, thereby reducing the greenhouse effect and environmental pollution, it is necessary to increase the operating temperature of the steam turbine of the thermal power unit. For example, increasing the operating temperature of coal-fired steam turbine steam from 550-580°C to 620-650°C, and the working pressure to 300 atmospheres (atm), can increase the power generation efficiency of the unit by about 10%, bringing considerable economic and economic benefits. Environmental benefits. However, the increase in working temperature puts forward higher requirements on the high-temperature performance of heat-resistant steel, which not only requires good enough high-tem...
Claims
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