An easy-to-weld ultra-high-strength and high-toughness steel and its preparation method

An ultra-high-strength, easy-to-weld technology, applied in the field of metallurgical materials and their preparation, can solve problems such as easy transformation into ferrite, and achieve the effects of low quenching temperature, good economic benefits, and high efficiency

Active Publication Date: 2021-10-15
CENT SOUTH UNIV +2
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Problems solved by technology

However, since the disclosed preparation process does not include tempering, when the steel is served in a higher temperature environment, the martensite contained in the structure is easily transformed into ferrite. In addition, the elongation disclosed in this technical solution is only 13.8%-18.8% %

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  • An easy-to-weld ultra-high-strength and high-toughness steel and its preparation method
  • An easy-to-weld ultra-high-strength and high-toughness steel and its preparation method
  • An easy-to-weld ultra-high-strength and high-toughness steel and its preparation method

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[0054] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail in conjunction with specific embodiments.

[0055] The BP network of the present invention adopts a structural model of 6×8×8×4, the training function uses trainscg, the learning rate is set to 0.1, the momentum phase factor is 0.9, and the target error value is 0.01. The number of nodes in the input layer is 6, and the content of C, Si, Mn, Mo, Cr, and V elements are used as input parameters; the number of nodes in the output layer is 4, and the output parameters are impact toughness, yield strength, tensile strength, and elongation; There are 2 hidden layers with 8 and 8 neurons respectively.

[0056] Figure 4 with Figure 5 The rule of influence of C content on strength, yield ratio, impact energy and elongation is analyzed for BP neural network. It can be seen that with the increase of C content, the yie...

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Abstract

The invention provides an easy-to-weld ultra-high-strength and high-toughness steel and a preparation method thereof. The steel includes the following chemical components in mass percentage: C: 0.25-0.28%, Si: 0.25-0.30%, Cr: 0.90-1.10% %, Mn: 0.90-1.10%, Mo: 0.45-0.60%, V: 0.07-0.10%, Ca: 0.0015-0.0050%, Cu: 0.01-0.10%, Ni: 0.01-0.20%, Al: 0.01-0.03% , P<0.01%, S<0.005%, and the balance is Fe and unavoidable impurities. The preparation method includes: steelmaking, casting, continuous rolling, incomplete austenitization and tempering. The steel material provided by the invention has ultra-high strength, good toughness, and is easy to weld, and can be used for load-bearing structural parts and oil-gas transmission pipelines that require ultra-high strength and toughness.

Description

technical field [0001] The invention relates to the technical field of metallurgical materials and their preparation, in particular to an easy-to-weld ultra-high-strength and high-toughness steel and a preparation method thereof. Background technique [0002] With the increasing emphasis on the safety of large structural parts, the comprehensive performance requirements of structural steel are getting higher and higher, not only requiring super high strength and good plasticity, but also requiring sufficient toughness reserves under service conditions . For structural parts that may serve under low temperature conditions, higher requirements are placed on the low temperature toughness of the steel used, and the specified impact temperature is revised from 20°C to 0°C. In addition, large structural parts also need to be welded, requiring steel to have better welding performance. However, strength, toughness, and weldability are mutually restricted, and it is difficult to ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C21D8/02C21D1/18
CPCC21D1/18C21D8/0226C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46
Inventor 李红英陈博轩席志海
Owner CENT SOUTH UNIV
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