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Short-flow production method of high-boron stainless steel plate

A technology of stainless steel plate and production method, applied in the direction of rolling force/roll gap control, temperature control, etc., can solve the problems of poor plastic deformation ability and difficult production, and achieve uniform boron content, high production efficiency, and diffusion coefficient. high effect

Inactive Publication Date: 2010-11-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Generally speaking, although high-boron stainless steel has broad application prospects, its production is still difficult due to its extremely poor plastic deformation ability, and there are relatively few domestic researches on this aspect.

Method used

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  • Short-flow production method of high-boron stainless steel plate
  • Short-flow production method of high-boron stainless steel plate
  • Short-flow production method of high-boron stainless steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] With boron content (C B ) 1.4% to 1.8%, and a high boron stainless steel plate with a thickness of 1mm is an example.

[0042] 1) Select the composite tube blank. You can choose a tube blank with an outer diameter of Φ630mm and a wall thickness of 50mm. After considering the amount of cutting, the outer diameter R3 = 310mm, and the inner diameter Ri = 270mm. The boron content in the inner layer metal is (Cm) 4.5±0.5%, and the boron content in the outer layer metal is (C') 0.1%. According to the formula (1), the full size of the composite tube blank can be estimated: R1=283.5 mm, R2 = 297.7 mm.

[0043] 2) Cast the outer layer of austenitic stainless steel first, the boron content is 0.1%, the casting temperature is between 1535±25°C, the thickness of the stainless steel is 20±2mm, and the centrifuge speed is gradually increased from 200 rpm to 300±100 rev / min. When the outer layer of stainless steel is initially solidified and the surface temperature is between 1400...

Embodiment 2

[0051] Take the high-boron stainless steel plate with a boron content (CB) of 2.5% to 3% and a thickness of 10mm as an example.

[0052] 1) Select the composite tube blank. You can choose a tube blank with an outer diameter of Φ710mm and a wall thickness of 60mm. After considering the amount of cutting, the outer diameter R3 = 350mm, and the inner diameter Ri = 300mm. The boron content in the inner layer metal is (Cm) 4.5±0.5%, and the boron content in the outer layer metal is (C') 0.1%. According to the formula (1), the full size of the composite tube blank can be estimated: R1=316.5 mm, R2 = 335.1 mm.

[0053] 2) According to the size of the tube blank selected in the previous step, refer to the casting process in the embodiment (1), directly cast a three-layer austenitic stainless steel composite tube blank, and cut the inner and outer layers by 5mm.

[0054] 3) Split the tube blank. Estimated according to formula (2), if the tube blank is evenly divided into parts, that...

Embodiment 3

[0063] Take the high-boron stainless steel plate with a boron content (CB) of 2.5% to 3% and a thickness of 3mm as an example.

[0064] Step 1)~step 4) all can refer to embodiment 2,

[0065] 5) Hot rolling the billet with a fan-shaped cross section, the rolling temperature is between 1180°C and 850°C, wherein:

[0066] ① The first to second passes are mainly to straighten the fan-shaped billet horizontally, the reduction is 10% to 20%, and the rolling start temperature should be kept at 1180°C to 1100°C;

[0067] ②The amount of deformation should be increased from the 3rd to the 10th pass, with a reduction of 15% to 30%, and the temperature should be kept above 950°C to fully break the as-cast structure.

[0068] ③ The reduction in the last 2 to 3 passes should be reduced and maintained at 10% to 15%, until the plate thickness reaches 3mm.

[0069] 6) Diffusion annealing is carried out under the protection of argon, and the hot-rolled plate is annealed in a resistance furna...

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Abstract

The invention discloses a short-flow production method of a high-boron stainless steel plate, which belongs to the field of metal material preparation and is used for manufacturing a high-boron austenitic stainless steel plate with a boron content of 0.5-3% and a thickness of 1-10mm. The method comprises the following main process: using three layers of austenitic stainless steel composite tube blanks which have different boron contents as raw materials, wherein the boron content of the intermediate layer is 2-10%, and the boron content of the austenitic stainless steel at the inner and outer layers is 0-0.1%; splitting the austenitic stainless steel into 3-10 parts of which the cross sections are fan-shaped in the axial direction; carrying out hot rolling on the split composite plate blanks, wherein the total deformation is 50-90%, the austenitic stainless steel of the intermediate layer fragments in the rolling process, and the boron elements are subject to preliminary diffusion; carrying out thermal diffusion annealing to uniformly distribute the boron elements by diffusion; and using a cold rolling process to improve the surface quality and the dimensional accuracy of the plates. Based on the characteristic that the plasticity of austenitic stainless steel is poor at high temperature when the boron content is high, the method produces the high-boron stainless steel plate by using the conventional hot rolling process, and has the advantages of short process flow and simple operation of equipment.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and relates to a short-process production technology of high-boron stainless steel plates, which are mainly used in nuclear power plant fuel storage, heat seed absorption materials and the like. Background technique [0002] The nuclear reactors currently under construction are mainly pressurized water reactors with high-temperature (280-350°C) and high-pressure (80-185 atmosphere) water as the working medium. This type of reactor generates energy through nuclear fission. Almost all spent fuel assemblies discharged from reactors during nuclear power plant operation are stored underwater in spent fuel storage grids. The spent fuel storage grid structure is equipped with neutron poison materials, which generally have a high thermal neutron absorption cross-section and can effectively absorb thermal neutrons to ensure that the spent fuel components will not reach a critical state during sto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/02B22D13/00B21B37/74B21B37/58C21D1/26
Inventor 韩静涛解国良
Owner UNIV OF SCI & TECH BEIJING
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