Rolled steel for wind-power flange and preparation method thereof
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A wind power flange and steel technology, applied in the field of alloy steel, can solve the problems of low welding performance, low temperature resistance, low strength grade, etc., and achieve the effect of increasing the probability of oxidized inclusions and reducing fatigue life
Active Publication Date: 2012-06-27
CHENGDE JIANLONG SPECIAL STEEL
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[0009] In view of the deficiencies in the prior art that the steel used for wind power flanges is low in strength, not resistant to low temperature, poor in welding performance, and prone to c...
Method used
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Embodiment 1
[0050] The chemical composition of steel includes: C 0.15%, Si 0.32%, Mn 1.52%, Nb 0.028%, V 0.080%, Al 0.026%, Ti 0.005%, S 0.0020%, P 0.009%, As 0.008%, [O]0.0007 %, [N]0.0090%, [H]0.00008%, and the balance is Fe.
[0051] Ring rolling specifications: 3282×2970×100, after normalizing at 930°C + tempering at 660°C, the mechanical properties obtained are as follows:
[0052] Tensile strength R m =650MPa, yield strength R el =500MPa, Elongation A 5 =23%, reduction of area Z=68%, -20°C, V-notch impact energy Akv: 62J, 66J, 64J.
Embodiment 2
[0054] The chemical composition of steel includes: C 0.18%, Si 0.29%, Mn 1.42%, Nb 0.030%, V0.078%, Al 0.025%, Ti 0.003%, S 0.0030%, P 0.011%, As 0.006%, [O] 0.0009%, [N] 0.0078%, [H] 0.00008%, and the balance is Fe.
[0055] Ring rolling specifications: 4200×3800×110, after normalizing at 930°C + tempering at 650°C, the mechanical properties obtained are as follows:
[0056] Tensile strength R m =680MPa, yield strength R el =490MPa, Elongation A 5 =24%, reduction of area Z=70%, -20°C, V-notch impact energy Akv: 60J, 80J, 76J.
Embodiment 3
[0058] C 0.16%, Si 0.35%, Mn 1.50%, Nb 0.032%, V 0.075%, Al 0.015%, Ti 0.004%, S 0.0031%, P 0.009%, As 0.011%, [O] 0.0012%, [N] 0.0108 %, [H]0.00013%, the balance is Fe.
[0059] Ring rolling specifications: 4000×3582×140, after normalizing at 930°C + tempering at 650°C, the mechanical properties obtained are as follows:
[0060] Tensile strength R m =620MPa, yield strength R el =460MPa, elongation A5=26%, reduction of area Z=72%, -20°C, V-notch impact energy Akv: 86J, 78J, 82J.
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Abstract
The invention relates to rolled steel for a wind-power flange. The rolled steel mainly comprises the following components in percentage by weight: 0.15-0.19 percent of C, 0.17-0.35 percent of Si, 1.45-1.55 percent of Mn, 0.060-0.090 percent of V, 0.02-0.04 percent of Nb, 0.015-0.040 percent of Al, less than or equal to 0.005 percent of Ti, less than or equal to 0.0015 percent of [O], less than or equal to 0.0120 percent of [N], less than or equal to 0.005 percent of S, less than or equal to 0.012 percent of P, less than or equal to 0.04 percent of As, less than or equal to 0.00015 percent of [H] and the balance of Fe. In the invention, the yield strength of the rolled steel is more than 465 MPa, and the tensile strength is more than 580 MPa; and the rolled steel has the characteristics of low-temperature resistance, high welding performance, high strength, high crack sensitivity resistance, high welding performance and high low-temperature impact performance, and can better adapt to the requirement of rolled steel for the wind-power flange in the wind-power industry.
Description
technical field [0001] The invention relates to alloy steel in the iron and steel industry, in particular to a steel for wind power flanges and a preparation method thereof. Background technique [0002] With the development of society, the international community is increasingly aware of the seriousness of environmental pollution and global warming. In order to "stabilize the greenhouse gas content in the atmosphere at an appropriate level, and prevent drastic climate change from causing harm to human beings" , the participating countries of the United Nations Framework Convention on Climate Change formulated the "Kyoto Protocol" and emission reduction plans and schedules in Kyoto, Japan in December 1997. Countries around the world have taken measures to curb the deterioration of environmental problems, and supporting the development of clean new energy is one of the most effective measures and is a strategic choice for countries around the world. Wind power is the abbrevi...
Claims
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