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

A technology of stainless steel, plasticity and toughness, which is applied in the field of metallurgical materials, can solve the problems of intensified size and uneven distribution of solidification structure, decrease of plasticity and toughness of mechanical properties of finished plates at room temperature, difficulty in satisfying mechanical properties of finished plates, etc., to achieve convenient Effect of mechanization and automation, improvement of uniform deformation ability, excellent plasticity and toughness

Active Publication Date: 2020-11-24
NORTHEASTERN UNIV LIAONING
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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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  • A boron-containing stainless steel thick plate with excellent plasticity and toughness and preparation method thereof
  • A boron-containing stainless steel thick plate with excellent plasticity and toughness and preparation method thereof
  • A 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 up to the soaking temperature T with the furnace, and keep it warm for 120 minutes, then perform 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 three composite blanks to form a composite blank; the V-shaped groove depth is 4mm, the angle is 40°; the width of the composite blank is 360mm, the thickness is 180mm, and the aspe...

Embodiment 3

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

[0080] (1) The thickness of the boron-containing stainless steel slab is 110 mm, 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 carry out 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 10...

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Abstract

A boron-containing stainless steel thick plate with excellent plasticity and toughness and a preparation method thereof. The composition contains Cr 18.0~20.0%, Ni 12.0~15.0%, Mn 0.2~2.0%, B 0.5~1.5%, Si<0.5% in mass percentage. C<0.02%, the rest is Fe; thickness 20~80mm, tensile strength ≥550MPa, room temperature elongation ≥18%, room temperature impact toughness ≥200KJ / m 2 ; The method is: (1) smelting molten steel; (2) rough rolling after soaking and maintaining the billet; (3) V-grooving the rough rolled billet to make a single body; stacking multiple single bodies and vacuum welding; (4 ) The front and rear ends of the composite billet are welded with plain carbon steel plates; (5) After heating to 1100~1150°C and heat preservation, multi-pass hot rolling is performed; (6) The ends of the common carbon steel are cut and then subjected to solution treatment and air cooling to room temperature. The method of the invention realizes uniform and fine control of boride in the finished plate, improves the plate shape and edge crack degree of the boron-containing stainless steel thick plate; the process production flow is compact and facilitates mechanization and automation.

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 Patents(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 LIAONING