Oxide-reinforced low-activation steel and manufacturing method thereof

A technology of low activation steel and manufacturing method, applied in the field of iron and steel metallurgy, can solve the problems of high cost, low efficiency, difficult to produce oxide-strengthened steel, etc., and achieves the improvement of anti-He brittle ability, strong effect and high temperature mechanical properties. Effect

Active Publication Date: 2021-08-31
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, limited by the mechanical alloying method, the cost is high and the efficiency is low
A nuclear fusion demonstration reactor needs to use about 3,500 tons of low-activation materials. Due to the lack of large-scale production equipment, it is difficult to produce such a large-scale oxide-strengthened steel by mechanical alloying.

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  • Oxide-reinforced low-activation steel and manufacturing method thereof

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Effect test

Embodiment 1

[0043] The manufacturing method of the oxide-reinforced low-activation steel of this embodiment comprises the following steps:

[0044] (1) Ultra-pure smelting of rare earth-rich steel: use a vacuum induction furnace to smelt according to the chemical composition of 9Cr2WVTa steel, and wait until the composition of the low-activation steel reaches the standard (and the mass fraction of oxygen in the steel is less than 10×10 -6 ) to add Ti pure metal, after the Ti metal is melted, add rare earth Y, after adding rare earth Y, carry out 300kW power stirring and refining for 15min, and then carry out tapping and casting into steel ingots; wherein, the amount of Ti added is 0.25% of the mass of the low-activation steel ; The amount of Y added is 0.5% of the low-activation steel mass;

[0045] (2) Pretreatment of low-activation steel: place the steel ingot at 1200 ° C for 3 hours, and then roll it into a wire rod with a diameter of 5 mm for use; during the rolling process, the start...

Embodiment 2

[0050] The manufacturing method of the oxide-reinforced low-activation steel of this embodiment comprises the following steps:

[0051] (1) Ultra-pure smelting of rare earth-rich steel: use a vacuum induction furnace to smelt according to the chemical composition of 9Cr2WVTa, and wait until the composition of the low-activation steel reaches the standard (and at this time the mass fraction of oxygen in the steel is less than 10×10 -6 ) to add Ti pure metal, after the Ti metal is melted, add rare earth Y, after adding rare earth Y, carry out 500kW power stirring and refining for 10min, and then carry out tapping and casting into steel ingots; wherein, the amount of Ti added is 0.5% of the mass of the low-activation steel ; The amount of Y added is 1% of the low-activation steel mass;

[0052] (2) Pretreatment of low-activation steel: place the steel ingot at 1250°C for 2 hours, and then roll it into a wire rod with a diameter of 10mm for use; during the rolling process, the sta...

Embodiment 3

[0057] The manufacturing method of the oxide-reinforced low-activation steel of this embodiment comprises the following steps:

[0058] (1) Ultra-pure smelting of rare earth-rich steel: use a vacuum induction furnace to smelt according to the chemical composition of 9Cr2WVTa steel, and wait until the composition of the low-activation steel reaches the standard (and the mass fraction of oxygen in the steel is less than 10×10 -6 ) to add Ti pure metal, after the Ti metal is melted, add rare earth Y, after adding rare earth Y, carry out stirring and refining with 400kW power for 13min, and then carry out tapping and casting into steel ingots; wherein, the amount of Ti added is 0.35% of the mass of the low-activation steel ; The amount of Y added is 0.65% of the low-activation steel mass;

[0059] (2) Pretreatment of low-activation steel: place the steel ingot at 1230°C for 2.5 hours, and then roll it into a wire rod with a diameter of 7mm for use; during the rolling process, the ...

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Abstract

The invention discloses oxide-reinforced low-activation steel and a manufacturing method thereof. The manufacturing method comprises the following steps of in the smelting process of the low-activation steel, after the components of the low-activation steel reach the standard, adding Ti, Zr or Hf into the low-activation steel, after melting down, adding Y, uniformly stirring, and tapping and casting into a steel ingot; conducting homogenizing annealing and rolling on the steel ingot to obtain a wire rod; drawing the wire rod into a wire material; and conducting electric arc fuse forming on the wire material to obtain the oxide-reinforced low-activation steel, wherein ion gas and shielding gas adopted in the electric arc fuse forming process are both mixed gas of CO2 and Ar gas, and the cooling mode is natural cooling and solidification under the Ar protection atmosphere. According to the oxide-reinforced low-activation steel, the structure of the oxide reinforcement phase is more complex, and compared with existing oxide-reinforced low-activation steel, the oxide-reinforced low-activation steel has better high-temperature mechanical performance, and meanwhile, the processing method can rapidly achieve processing of the oxide-reinforced low-activation steel, and the yield of the oxide-reinforced low-activation steel can be increased.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to an oxide-strengthened low-activation steel and a manufacturing method thereof. Background technique [0002] As an important engineering structural material, low-activation steel is considered to be the preferred structural material for the cladding of the first wall of a nuclear fusion reactor due to its advantages such as low activation, low radiation swelling rate, and excellent thermophysical properties. The design working temperature range of low-activation steel is 325-550°C, which can no longer meet the requirements of CFETR Phase II and future nuclear fusion reactors. The current main solution is to add oxide disperse phases to prepare oxide-strengthened alloys, which adopt mechanical alloying process The prepared steel has the best performance. Dispersed distribution of Y in steel 2 o 3 It can pin dislocations to improve the high-temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/22C22C38/24C22C38/26C22C38/28B21C1/02B22F10/18C21D1/26C21D6/00C21D8/06C21D9/52B33Y10/00B33Y70/10
CPCB21C1/02B33Y10/00B33Y70/10B22F10/18C21D1/26C21D6/002C21D8/065C21D9/525C22C32/0026C22C33/04C22C38/005C22C38/22C22C38/24C22C38/26C22C38/28Y02P10/25
Inventor 邱国兴李小明韦旭立白冲贺芸李林波
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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