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Low-carbon-equivalent steel plate for nuclear containment as well as production method of steel plate

A nuclear containment and production method technology, applied in the field of metallurgy, can solve the problems of reducing the mechanical properties of steel plates and difficult to guarantee performance, and achieve the effect of improving the toughness of the matrix and uniform and fine grains

Inactive Publication Date: 2018-07-06
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A lower composition design is a necessary condition to ensure good weldability of the steel plate, but it will inevitably reduce the mechanical properties of the steel plate, especially the performance after simulated post-weld heat treatment is more difficult to guarantee

Method used

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  • Low-carbon-equivalent steel plate for nuclear containment as well as production method of steel plate
  • Low-carbon-equivalent steel plate for nuclear containment as well as production method of steel plate
  • Low-carbon-equivalent steel plate for nuclear containment as well as production method of steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The thickness of the steel plate for low-carbon equivalent nuclear containment in this example is 20 mm, and its chemical composition and mass percentage are: C: 0.10%, Si: 0.25%, Mn: 1.27%, P: 0.005%, S: 0.002% , Cr: 0.19%, Ni: 0.24%, Cu: 0.080%, Mo: 0.21%, Nb: 0.020%, V: 0.003%, Alt: 0.028%, the balance is Fe and unavoidable impurities, carbon equivalent CEV= 0.41%.

[0021] The production method of the steel plate for low-carbon equivalent nuclear containment in this embodiment includes smelting, billet heating, billet rolling, and steel plate heat treatment processes, and the specific process steps are as follows:

[0022] (1) Smelting: electric furnace smelting + LF furnace refining + VD vacuum treatment; during LF furnace refining, the white slag retention time is 34 minutes, the total refining time is 58 minutes, and argon blowing is good throughout the process; during VD vacuum treatment, the vacuum degree is 66Pa, and the vacuum Hold time 25 minutes;

[0023]...

Embodiment 2

[0031] The thickness of the steel plate for low-carbon equivalent nuclear containment in this example is 38 mm, and its chemical composition and mass percentage are: C: 0.09%, Si: 0.29%, Mn: 1.28%, P: 0.006%, S: 0.002% , Cr: 0.17%, Ni: 0.28%, Cu: 0.070%, Mo: 0.25%, Nb: 0.030%, V: 0.007%, Alt: 0.037%, the balance is Fe and unavoidable impurities, carbon equivalent CEV= 0.41%.

[0032] The production method of the steel plate for low-carbon equivalent nuclear containment in this embodiment includes smelting, billet heating, billet rolling, and steel plate heat treatment processes, and the specific process steps are as follows:

[0033] (1) Smelting: electric furnace smelting + LF furnace refining + VD vacuum treatment; during LF furnace refining, the white slag retention time is 30 minutes, the total refining time is 55 minutes, and argon blowing is good throughout the process; during VD vacuum treatment, the vacuum degree is 60Pa, and the vacuum Hold time 23 minutes;

[0034]...

Embodiment 3

[0042] The thickness of the steel plate for low-carbon equivalent nuclear containment in this example is 45 mm, and its chemical composition and mass percentage are: C: 0.10%, Si: 0.34%, Mn: 1.35%, P: 0.006%, S: 0.005% , Cr: 0.20%, Ni: 0.19%, Cu: 0.060%, Mo: 0.15%, Nb: 0.036%, V: 0.002%, Alt: 0.042%, the balance is Fe and unavoidable impurities, carbon equivalent CEV= 0.41%.

[0043] The production method of the steel plate for low-carbon equivalent nuclear containment in this embodiment includes smelting, billet heating, billet rolling, and steel plate heat treatment processes, and the specific process steps are as follows:

[0044] (1) Smelting: electric furnace smelting + LF furnace refining + VD vacuum treatment; during LF furnace refining, the white slag retention time is 35 minutes, the total refining time is 57 minutes, and argon blowing is good throughout the process; during VD vacuum treatment, the vacuum degree is 63Pa, and the vacuum Hold time 25 minutes;

[0045]...

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Abstract

The invention discloses a low-carbon-equivalent steel plate for a nuclear containment as well as a production method of the steel plate. The steel plate comprises the following chemical components inpercentage by mass: 0.09 to 0.13 percent of C, 0.25 to 0.40 percent of Si, 1.00 to 1.35 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 0.15 to 0.30percent of Cr, 0.15 to 0.35 percent of Ni, 0.15 to 0.25 percent of Mo, less than or equal to 0.10 percent of Cu, 0.020 to 0.040 percent of Nb, less than or equal to 0.10 percent of V, more than or equal to 0.020 percent of Alt, and the balance of Fe and unavoidable impurities, wherein the carbon equivalent CEV is less than or equal to 0.42 percent. The production method comprises the processes ofsmelting, heating a steel billet, rolling the steel billet and performing heat treatment on the steel plate. The steel plate can meet and simulate the normal-temperature stretching, high-temperature stretching and low-temperature impact properties of the delivery state and the heat treatment state after welding simultaneously, and can be widely applied to nuclear power projects at home and aboard.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a steel plate for a low-carbon equivalent nuclear containment vessel and a production method thereof. Background technique [0002] The nuclear containment is the landmark building of the nuclear power plant, and all the equipment of the nuclear steam supply system are installed in it. Nuclear containment is the protector of nuclear power plants. The safety and reliability requirements of the inner steel plate are very strict, requiring high yield strength and tensile strength; good low temperature toughness; good high temperature resistance; in addition, steel plates for nuclear containment It needs to be welded after deformation, so good weldability and cold and hot processing performance are also very important. [0003] With the rapid rise of my country's nuclear power plants, the design of nuclear power plants is becoming more and more stringent, and the requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/42C22C38/48C22C38/46C22C38/06C21D8/02C21D1/18
CPCC21D1/18C21D8/0226C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48
Inventor 邓建军李建朝李杰龙杰石莉林明新刘生程含文牛晓晖谢东张萌刘印子张海军李劲锋肖雄峰管秀兵
Owner WUYANG IRON & STEEL
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