High-strength-toughness high-boron stainless steel thin plate and preparation method thereof

A high-strength, toughness, stainless steel technology, applied in the field of metallurgical materials, can solve the problems of low production efficiency, long and complex process flow, complex chemical composition, etc., and achieve the effect of fewer manufacturing processes, lower production costs, and uniform distribution.

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

AI Technical Summary

Problems solved by technology

This method is not only complicated in chemical composition, but also has a lengthy and complex smelting-processing process, resulting in low production efficiency

Method used

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  • High-strength-toughness high-boron stainless steel thin plate and preparation method thereof
  • High-strength-toughness high-boron stainless steel thin plate and preparation method thereof
  • High-strength-toughness high-boron stainless steel thin plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The composition of molten steel for smelting is: B 2.5%, C 0.006%, Cr 17.9%, Ni 15.8%, Mn 1.5%, Si 0.8%, the rest is Fe and unavoidable impurities, and the element composition meets Nieq>1.1Creq -7.0, where Nieq=15.8+30×0.006+0.5×1.5=16.73, Creq=17.9+1.5×0.8=19.1;

[0037] The molten steel enters the tundish, and then flows into the cavity surrounded by the two crystallization rolls and side sealing plates of the twin-roll continuous casting machine to form a molten pool, in which the two crystallization rolls rotate in opposite directions; the molten steel in the molten pool passes through two The roll gap between the crystallization rolls is solidified and exported to form a thin strip; the morphology of the thin strip and the distribution of each element are as follows: figure 2 and image 3 shown;

[0038] Air-cool the thin strip to 1100°C, and then use a hot rolling mill to perform single-pass hot rolling with a reduction rate of 38%, and the speed during hot ro...

Embodiment 2

[0043] Method is with embodiment 1, and difference is:

[0044] (1) Molten steel, its composition by mass percentage is: B 2.1%, C 0.004%, Cr 16.2%, Ni 17.4%, Mn 1.0%, Si 0.6%; Wherein Nieq=17.4+30×0.004+0.5×1.0= 18.02, Creq=16.2+1.5×0.6=17.1;

[0045] (2) The thin strip is air-cooled to 900°C, and then hot-rolled in a single pass with a hot rolling mill, with a reduction rate of 28%, and a speed of 1.0m / s during hot rolling; wherein the microstructure of the thin strip is as follows: Figure 6 shown;

[0046] (3) The hot-rolled sheet is water-cooled to 650°C and then coiled;

[0047] (4) The annealing temperature is 1000°C, the annealing holding time is 30min, and the reduction rate during smoothing is 1.0%;

[0048] (5) The thickness of high-strength and toughness high-boron stainless steel sheet is 1.3mm, the tensile strength is 760MPa, the elongation at room temperature is 15.2%, and the impact toughness at room temperature is 246KJ / m 2 The borides with a particle size...

Embodiment 3

[0050] Method is with embodiment 1, and difference is:

[0051] (1) Molten steel, its composition by mass percentage is: B 2.3%, C 0.007%, Cr 17.5%, Ni 16.0%, Mn1.3%, Si 1.0%; Wherein Nieq=16.0+30×0.007+0.5×1.3= 16.86, Creq=17.5+1.5×1.0=18;

[0052] (2) The thin strip is air-cooled to 1050°C, and then hot-rolled in a single pass with a reduction rate of 20%, and the speed during hot rolling is 0.5m / s;

[0053] (3) The hot-rolled sheet is water-cooled to 650°C and then coiled;

[0054] (4) The annealing temperature is 1100°C, the annealing holding time is 15min, and the reduction rate during smoothing is 1.0%;

[0055] (5) The thickness of high-strength and toughness high-boron stainless steel sheet is 2.4mm, the tensile strength is 800MPa, the elongation at room temperature is 14.5%, and the impact toughness at room temperature is 232KJ / m 2 ; The borides with a particle size smaller than 1.0 μm accounted for 63.2% of the total area, and the borides with a particle size larg...

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Abstract

The invention provides a high-strength-toughness high-boron stainless steel thin plate and a preparation method thereof. The stainless steel thin plate comprises the ingredients of, in percentage by mass, 2.0-2.5% of B, less than 0.01% of C, 16.0-18.0% of Cr, 15.5-17.5% of Ni, 1.0-2.0% of Mn, 0.5-1.0% of Si and the balance Fe, wherein Nieq is larger than 1.1 Creq-7.0, the tensile strength is 700-850 MPa, and the room temperature extending rate is 12.5-15.5%. The preparation method comprises the steps that (1), liquid steel smelting is performed; (2), liquid steel enters a tundish to be continuously-cast into thin strips; (3), single pass hot rolling is performed after air cooling is performed to 900-1100 DEG C, and the press down rate is 15-40%; (4), coiling is performed after water cooling is performed to 600-700 DEG C; and (5), annealing treatment is performed under a protective atmosphere condition after uncoiling, and then flattening treatment is performed. By means of the high-strength-toughness high-boron stainless steel thin plate and the preparation method thereof, the alloy element segregation degree is improved, the high-boron stainless steel hot rolled plate with smoothappearance and no edge crack is obtained, the high-strength-toughness high-boron stainless steel thin plate and the preparation method thereof are compact in production procedure and less in fabrication working procedure, and the production cost can be significantly lowered.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, in particular to a high-strength and toughness high-boron stainless steel thin plate and a preparation method thereof. Background technique [0002] The service environment of thermal neutron absorbing materials used for nuclear power plant spent fuel storage is relatively harsh, so the requirements for its performance are also extremely stringent; for thermal neutron absorbing materials used It has the ability to withstand large radiation doses and strong corrosion resistance; for thermal neutron absorbing materials used in spent fuel transport containers, it may withstand higher temperatures and greater corrosion resistance under normal use or accident conditions. Impact damage, so it should have relatively good mechanical properties; natural boron has 11 B and 10 Two isotopes of B, of which, 10 The thermal neutron absorption cross section of B isotope is 3837 Barn; in additi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/54C22C38/58B22D11/06C21D8/02C22C33/04
CPCB22D11/0622C21D8/0205C21D8/0226C21D8/0263C22C33/04C22C38/02C22C38/04C22C38/54C22C38/58
Inventor 刘海涛李永旺黄晓明王昭杰张晓明王国栋
Owner NORTHEASTERN UNIV
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