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High-boron stainless steel neutron-absorbing material and preparation method thereof

An absorbing material, stainless steel technology, applied in shielding, nuclear engineering, reactors, etc., can solve the problem of difficult to avoid the continuous network eutectic boride of the grain group, and achieve good r-ray and neutron absorption performance, material consistency. High density, high relative density effect

Active Publication Date: 2017-02-08
安泰核原新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Under the traditional casting process, it is difficult to avoid the formation of large grain groups and continuous network eutectic borides during the solidification process of high boron steel

Method used

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  • High-boron stainless steel neutron-absorbing material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] The composition of the high-boron stainless steel neutron absorption material provided in this embodiment is. B: 2.1%, Cr: 19%, Ni: 14%, C: 0.08%, Mn: 2%, Si: 0.75, P≤0.045%, S≤0.030 and the rest is iron. These elements are added in the form of iron alloy.

[0033] Such as figure 1 As shown, the preparation of the high-boron stainless steel neutron absorbing material in this embodiment sequentially includes the following steps:

[0034] (1) The raw material powder preparation steps: gas atomization melting various ferroalloy components, 100°C higher than the melting point, powder spraying pressure of 30MPa, the collected powder passes a 200-mesh sieve, and the yield of -200-mesh powder exceeds 50%;

[0035] (2) Hot isostatic pressing step: put the mixed powder into a sheath, vacuum exhaust temperature is 450℃, sealed, hot isostatic pressing treatment, pressing pressure is 100MPa, temperature is 950℃, and holding time is 1.5 hours, get hot isostatic pressing blank;

[0036] (3)...

Embodiment 2

[0039] The composition of the high-boron stainless steel neutron absorbing material provided by this embodiment is B: 0.25%, Cr: 15%, Ni: 12%, C: 0.20%, Mn: 1.5%, Si: 2.5%, P≤0.045%, S ≤0.030 The rest is iron. These elements are added in the form of iron alloy.

[0040] The preparation of the high-boron stainless steel neutron absorbing material in this embodiment sequentially includes the following steps:

[0041] (1) Preparation steps of raw material powder: gas atomization melting various ferroalloy components, 150°C higher than the melting point, powder spraying pressure of 25MPa, the collected powder passes through a 150 mesh sieve, and the yield of -150 mesh powder exceeds 50%;

[0042] (2) Hot isostatic pressing step: put the mixed powder into a sheath, vacuum exhaust temperature is 350℃, sealed, hot isostatic pressing treatment, pressing pressure is 120MPa, temperature is 1050℃, holding time is 2.0 hours, get hot isostatic pressing blank;

[0043] (3) Hot rolling step: hot-r...

Embodiment 3

[0046] The composition of the high-boron stainless steel neutron absorbing material provided by this embodiment is B: 0.6%, Cr: 15%, Ni: 12%, C: 0.20%, Mn: 1.5%, Si: 2.5%, P≤0.045%, S ≤0.030 The rest is iron. These elements are added in the form of iron alloy.

[0047] The preparation of the high-boron stainless steel neutron absorbing material in this embodiment sequentially includes the following steps:

[0048] (1) Preparation steps of raw material powder: gas atomization melting various ferroalloy components, 200℃ higher than the melting point, powder spraying pressure of 20MPa, the collected powder passes a 100 mesh sieve, and the yield of -100 mesh powder exceeds 55%;

[0049] (2) Hot isostatic pressing forming step: Put the mixed powder into a jacket, vacuum exhaust temperature at 300℃, sealing, hot isostatic pressing treatment, pressing pressure is 140MPa, temperature is 1100℃, and holding time is 2.5 hours, get hot isostatic pressing blank;

[0050] (3) Hot rolling step: ho...

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Abstract

The invention provides a high-boron stainless steel neutron-absorbing material and a preparation method thereof, and belongs to the field of neutron-absorbing materials. The high-boron stainless steel neutron-absorbing material comprises the following components in percentage by mass: 0.2-3% of B, 12-26% of Cr, 1.5-23% of Ni, 0.02-0.6% of C, 1-11% of Mn, 0-7% of Mo, no less than 3% of Si, no less than 0.2% of P, no less than 0.030% of S and the balance of iron. The preparation method comprises the following steps: atomization spraying for powder preparation; hot-isostatic-pressing sintering, and rolling. The prepared high-boron stainless steel has the advantages that the stainless steel density is high, the relative density is higher than 99.8%, the stainless steel structure is uniform; the room-temperature tensile strength is higher than 500 MPa, the yield strength is higher than 200 MPa and the ductility is higher than 5%. Meanwhile, the prepared high-boron stainless steel is applicable to a nuclear radiation protective shielding material, a spent fuel storage material, a reactor control material and the like, and has good economic benefit and social benefit.

Description

Technical field [0001] The invention belongs to the field of neutron absorption materials, and relates to a high-boron stainless steel neutron absorption material and a preparation method thereof. Background technique [0002] Nuclear power plant fuel storage grids, fuel transportation, transportation, neutron shielding and other fields require neutron absorbing materials to avoid neutron radiation. Commonly used neutron absorbing materials include lead-boron polyethylene, boron-containing polypropylene, cadmium plates, boron carbide, aluminum-based boron carbide and boron steel. Boron steel has sufficient structural mechanical properties and good neutron absorption capacity. [0003] Boron has an atomic number of 5 and an atomic weight of 10.811. There are two stable isotopes: boron 10 and boron 11, with natural abundances of 19.78% and 80.22% respectively; the absorption cross section of boron 10 for neutrons is 5 times that of the natural abundance of boron It is more than 20 t...

Claims

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Application Information

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IPC IPC(8): B22F9/08B22F3/15B22F3/24C22C33/02C22C38/54C22C38/58C22C38/04C22C38/44C22C38/02G21F1/08
CPCB22F3/15B22F3/24B22F9/082B22F2998/10C22C33/0207C22C33/0285C22C38/02C22C38/04C22C38/34C22C38/44C22C38/54C22C38/58G21F1/085
Inventor 裴燕斌刘桂荣王铁军
Owner 安泰核原新材料科技有限公司
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