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Boron-containing stainless steel thick plate with excellent plasticity and toughness and preparation method thereof

A stainless steel, plastic toughness technology, applied in the field of metallurgical materials, can solve the problems of the plasticity and toughness of the mechanical properties of the finished plate at room temperature, the increase of the size and distribution of the solidified structure, and the difficulty of satisfying the mechanical properties of the finished plate. Effect of mechanization and automation, improvement of uniform deformation ability, excellent plasticity and toughness

Active Publication Date: 2019-12-03
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After boron is added to stainless steel, a large number of hard and brittle eutectic borides will be precipitated in the steel, and will be continuously distributed around the austenite, which not only deteriorates the hot workability of the billet, but also causes the mechanical properties of the finished plate at room temperature, especially the plasticity. and sharp decline in toughness
If the thickness of the prepared slab increases, the size and distribution of the solidification structure will be significantly intensified
In the subsequent rolling process, the uneven transmission of the rolling force from the surface of the rolled piece to the core area makes it difficult to achieve high uniformity in the grain and composition of the finished plate in the direction of the entire thickness, and the mechanical properties of the final finished plate are very poor. Difficult to meet the requirements of serving in the nuclear power field
[0004] As the main method for preparing high-boron stainless steel plates at present, powder metallurgy has unique technical advantages in the preparation of boron-containing stainless steel sheets. long, expensive to prepare

Method used

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  • Boron-containing stainless steel thick plate with excellent plasticity and toughness and preparation method thereof
  • Boron-containing stainless steel thick plate with excellent plasticity and toughness and preparation method thereof
  • Boron-containing stainless steel thick plate with excellent plasticity and toughness and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The molten steel is smelted, and then the molten steel is made into a boron-containing stainless steel slab through die casting or continuous casting; the thickness of the boron-containing stainless steel slab is 160mm, and the composition contains Cr 18.5%, Ni 14.6%, Mn 0.7%, B 1.25% by mass percentage , Si0.31%, C 0.011%, the rest is Fe and unavoidable impurity elements;

[0051] Put the boron-containing stainless steel slab into the heating furnace and heat up to the soaking temperature T with the furnace, and keep it warm for 120 minutes, and then perform multi-pass rough rolling. 1 Meet 10mm≤△h 1 ≤H 1 mm, to obtain a rough rolled billet with a thickness of 65mm;

[0052] T=(1155-1450×1.25%)=1137°C;

[0053] H in the first rough rolling pass 1 =0.065×1137-1500×1.25%-20=74-39=35mm;

[0054] The compression ratio of rough rolling is 160 / 65=2.46;

[0055] After the rough rolling billet is milled to a surface roughness Ra≤0.8μm, a V-shaped bevel for welding is mad...

Embodiment 2

[0065] Method is with embodiment 1, and difference is:

[0066] (1) The thickness of the cast slab of boron-containing stainless steel is 220 mm, and the composition contains Cr 18.2%, Ni 13.4%, Mn 1.15%, B 0.65%, Si 0.23%, and C 0.013% by mass percentage;

[0067] (2) Put the boron-containing stainless steel cast slab into the heating furnace and heat it up to the soaking temperature T with the furnace, and keep it warm for 120 minutes, then carry out multi-pass rough rolling, the rough rolling final rolling temperature is 925 ° C, and obtain a rough rolled slab with a thickness of 60 mm;

[0068] T=(1155-1450×0.65%)=1146°C;

[0069] H during the first rough rolling 1 =0.065×1146-1500×0.65%-20=74.5-9.8-20=44.7mm;

[0070] The compression ratio of rough rolling is 3.67;

[0071] (3) Vacuum welding of 3 composite blanks to form a composite blank; V-shaped groove depth 4mm, angle 40°; composite blank width 360mm, thickness 180mm, aspect ratio 2;

[0072] (4) The length of or...

Embodiment 3

[0079] Method is with embodiment 1, and difference is:

[0080] (1) The thickness of the boron-containing stainless steel slab is 110mm, and the composition contains Cr 19.4%, Ni 14.76%, Mn 0.61%, B 1.47%, Si 0.19%, and C 0.009% by mass percentage;

[0081] (2) Put the boron-containing stainless steel cast slab into the heating furnace and heat up to the soaking temperature T with the furnace, and keep it warm for 95 minutes, then perform multi-pass rough rolling, the rough rolling final rolling temperature is 935 ° C, and obtain a rough rolled slab with a thickness of 50 mm;

[0082] T=(1155-1450×1.47%)=1134°C;

[0083] H during the first rough rolling 1 =0.065×1134-1500×1.47%-20=73.7-22.1-20=31.6mm;

[0084] The compression ratio of rough rolling is 2.2;

[0085] (3) Two composite blanks are stacked and vacuum-welded to form a composite blank; the depth of the V-shaped groove is 4.5mm, and the angle is 45°; the width of the composite blank is 400mm, the thickness is 100mm...

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Abstract

The invention relates to a boron-containing stainless steel thick plate with excellent plasticity and toughness and a preparation method thereof. The boron-containing stainless steel thick plate comprises the following components in percentage by mass: 18.0-20.0% of Cr, 12.0-15.0% of Ni, 0.2-2.0% of Mn, 0.5-1.5% of B, less than 0.5% of Si, less than 0.02% of C and the balance of Fe. The thicknessis 20-80mm, the tensile strength is more than or equal to 550MPa, the room-temperature ductility is more than or equal to 18%, and the room-temperature impact toughness is more than or equal to 200KJ / m <2>; the method comprises the following steps: (1) smelting molten steel; (2) roughly rolling the casting blank after soaking and heat preservation; (3) forming a V-shaped groove in the rough rolling blank to prepare a single body; stacking the plurality of single bodies, and carrying out vacuum welding; (4) welding plain carbon steel plates at the front and rear ends of the composite blank; (5)heating to 1100-1150 DEG C, carrying out heat preservation, and carrying out multi-pass hot rolling; and (6) cutting the end part of the plain carbon steel, carrying out solution treatment, and carrying out air cooling to room temperature. By means of the method, homogenization and fine control over boride in the finished plate are achieved, and the plate shape and the edge cracking degree of theboron-containing stainless steel thick plate are improved; the process production flow is compact, and mechanization and automation are convenient to achieve.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, in particular to a thick boron-containing stainless steel plate with excellent plasticity and toughness and a preparation method thereof. Background technique [0002] As a kind of electric energy with zero carbon emissions, the development of nuclear power is attracting the attention of countries all over the world; during the storage and transportation of spent fuel, thermal neutron shielding materials must be used to reduce its reactivity and prevent it from returning to nuclear criticality. natural boron 10 The B isotope efficiently absorbs thermal neutrons, after which only soft gamma photons and easily absorbed alpha particles are produced. Boron is added to stainless steel to prepare boron-containing stainless steel with excellent mechanical and corrosion resistance properties, which is widely used in the field of nuclear power. Among them, different service environments ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/54C22C38/04C22C38/02C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0247C22C38/02C22C38/04C22C38/54C22C38/58
Inventor 刘海涛李永旺王昭杰
Owner NORTHEASTERN UNIV
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