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Smelting method for refining inclusions in P91 steel

A smelting method and inclusion technology, which are applied in the field of refining P91 steel inclusions, can solve the problems of large inclusions, large numbers, and low purity, and achieve small inclusions, high safety, and strong operability. Effect

Active Publication Date: 2021-08-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems that the inclusions in the current P91 steel castings are relatively large in size, large in number and low in purity

Method used

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  • Smelting method for refining inclusions in P91 steel
  • Smelting method for refining inclusions in P91 steel
  • Smelting method for refining inclusions in P91 steel

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Embodiment

[0027] figure 1A flow chart of smelting fine inclusions according to the present invention is given. The steelmaking production process of the present invention includes: primary smelting in an electric furnace, refining in an LF furnace, feeding aluminum wires, argon blowing at the bottom, VD refining, and casting.

[0028] The chemical material is selected according to the weight percentage of the preset chemical composition. The preset chemical composition weight percentage is: C:0.10wt.%, Si:0.30wt.%, Mn:0.5wt.%, P:0.01wt.%, S:0.005wt.%, V:0.21wt.%, Nb: 0.08wt.%, Ni: 0.30wt.%, Cr: 9.0wt.%, N: 0.04wt.%, Mo: 0.95wt.%, Al: 0.03wt.%, and the balance is Fe. During this process, special personnel are assigned to batch the ingredients, the charging amount of the furnace charge is 53t, and the loading amount of pig iron is 24t. It is believed that the bottom of the furnace is protected by laying steel plates or chips when charging. When there is no residual steel slag in the fu...

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Abstract

The invention discloses a smelting method for refining inclusions in P91 steel, and belongs to the technical field of refining steel inclusions. According to the smelting method, fine Al-rare earth-Ti alloy reaming wires are fed into a melt in a multi-point area trace supply mode, so that the reaction intensity when the rare earth is independently added into molten steel is reduced, oxygen uptake of the molten steel is reduced, meanwhile, a flow field is formed in the melt in a bottom blowing inert gas mode, and thus, inclusions (oxides) of nanoscale and a small amount of micron-sized particles are obtained and formed in molten steel (the A + B + C + D + DS grade of the inclusions is smaller than or equal to 1.5), and finally the P91 steel with the high purity is obtained. According to the smelting method, the cost is low, mass production can be conducted, the complexity of products has little limitation, the plasticity and toughness are greatly improved, and excellent comprehensive performance is achieved.

Description

technical field [0001] The invention relates to a method for refining P91 steel inclusions, and belongs to the technical field of refining steel inclusions. Background technique [0002] In today's era, there are three major problems in the field of metallurgy and materials. The first is the control of the level of inclusions in the steel, the second is the uniformity control of the chemical composition in the metal material (composition segregation), and the third is how to make the metal material both strengthened and toughened, that is, to break through the existing plasticity of the metal material when it is strengthened Decline, the contradiction that the strength decreases when toughened. Coarse inclusions, as the source of cracks during material deformation, strongly deteriorate the mechanical properties of materials, especially fatigue properties, so the control of inclusions is very important [K. Lu, L. Lu, S. Suresh, Strengthening materials by engineering coherent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C22C38/02C22C38/04C22C38/24C22C38/26C22C38/22C22C38/46C22C38/48C22C38/44C22C38/06C21C5/52C21C7/00C21C7/06C21C7/10
CPCC21C5/52C21C7/0006C21C7/0056C21C7/06C21C7/10C22C33/06C22C38/001C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/44C22C38/46C22C38/48Y02P10/20
Inventor 陈晓华吴雪华王自东赵思远王艳林陈凯旋
Owner UNIV OF SCI & TECH BEIJING
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