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Uniform and fine duplex stainless steel thin strip based on cast-rolling short process and preparation method of uniform and fine duplex stainless steel thin strip

A duplex stainless steel and short-process technology, which is applied in the field of steel material manufacturing, can solve the problems of affecting the yield, poor coordination of two-phase deformation, and limiting the total reduction of rolling, so as to shorten working hours, avoid rolling cracking, Effect of Large Rolling Deformation

Active Publication Date: 2021-06-04
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the early billet casting method, the continuous casting method improves the quality of the billet to a certain extent and saves energy, but it still has a large energy consumption and a large investment cost, and the finished product has obvious anisotropy. opposite sex
In addition, the rolling deformation in the existing preparation technology is in the dual-phase region. Due to the poor coordination of the two-phase deformation, the steel plate is prone to cracking during the rolling process, which affects the yield and greatly limits the total rolling pressure. Lower amount, it is difficult to obtain finer two-phase grain size

Method used

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  • Uniform and fine duplex stainless steel thin strip based on cast-rolling short process and preparation method of uniform and fine duplex stainless steel thin strip
  • Uniform and fine duplex stainless steel thin strip based on cast-rolling short process and preparation method of uniform and fine duplex stainless steel thin strip
  • Uniform and fine duplex stainless steel thin strip based on cast-rolling short process and preparation method of uniform and fine duplex stainless steel thin strip

Examples

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Effect test

Embodiment 1

[0037] A method for preparing uniform and fine duplex stainless steel thin strips based on short casting and rolling processes, the process flow is as follows figure 1 As shown, the specific steps are as follows:

[0038] Step 1, molten steel smelting:

[0039] The composition is in accordance with the composition ratio of 2205 duplex stainless steel, that is (wt%): C: 0.06%, Si: 0.42%, Mn: 1.65%, Ni: 5.0%, Cr: 22.2%, N: 0.12%, Fe balance . Molten steel is smelted in an argon-filled, high-pressure melting furnace. Among them, argon gas is used to prevent the entry of other gases; high pressure is beneficial to improve the yield of manganese and nitrogen.

[0040] Step 2, twin roll casting:

[0041]Preheat the tundish 1, then pour molten steel into the tundish 1, and control the superheat between 50 and 80°C, which is beneficial to avoid partial solidification (crystallization) of the molten steel in the tundish, or even freezing to block the nozzle; at the same time, It c...

Embodiment 2

[0055] Melting molten steel, its composition ratio is (wt%): C: 0.03%, Si: 1.0%, Mn: 5.0%, Ni: 1.5%, Cr: 21.0%, N: 0.2%, Mo: 0.5%, Cu: 0.5%, Fe balance; Subsequent preparation of duplex stainless steel thin strip according to the technical process of embodiment 1, wherein the specific process parameters involved are shown in Table 1; the fine and uniform grain metallographic structure of the finished thin strip is shown in Figure 4 ; The stress-strain curve under the quasi-static tensile test is as follows Figure 7 shown.

Embodiment 3

[0057] Melting molten steel to prepare a duplex stainless steel strip with TRIP effect, its composition ratio is (wt%): C: 0.04%, Si: 1.6%, Mn: 2.9%, Ni: 2.0%, Cr: 20% , N: 0.19%, Mo: 0.5%, and the remainder of Fe; subsequently, duplex stainless steel thin strips were prepared according to the process flow of Example 1. The specific process parameters involved are shown in Table 1; the fine and uniform grain metallographic structure of the finished strip is shown in Table 1. Figure 5 ; The stress-strain curve under the quasi-static tensile test is as follows Figure 7 shown.

[0058] For ease of comparison, the following comparative examples are provided:

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Abstract

The invention provides a uniform and fine duplex stainless steel thin strip based on a cast-rolling short process and a preparation method of the uniform and fine duplex stainless steel thin strip, and relates to the field of steel and iron material manufacturing. The preparation method comprises the following steps of carrying out double-roller casting and rolling, specifically preheating a tundish to 1320-1380 DEG C, casting molten steel with the temperature of 1480-1530 DEG C into the tundish, enabling the molten steel to flow into a molten pool, and leading the molten steel out along with the rotation of a crystallization roller to form a single-phase ferrite cast strip with the thickness of 3-4mm; and carrying out heavy cold rolling, short-time solid solution treatment, light hot rolling and curling. By means of the method, the anisotropy of the duplex stainless steel can be effectively eliminated, the grain size of two phases is reduced, and the duplex stainless steel with high yield strength, tensile strength and ductility is obtained.

Description

technical field [0001] The invention relates to the field of steel material manufacturing, in particular to a thin duplex stainless steel thin strip based on a short cast-rolling process and a preparation method thereof. Background technique [0002] Duplex stainless steel has a ferrite-austenite dual-phase structure, and is widely used in various fields because it has the advantages of high strength of ferritic steel and high plasticity of austenitic steel without losing good corrosion resistance. However, the mechanical properties of duplex stainless steel depend to a large extent on the distribution characteristics of the two phases, and after the traditional rolling process, its microstructure mostly presents two phases that are severely elongated along the rolling direction. It leads to obvious anisotropy in mechanics, which greatly limits the formability of duplex stainless steel. On the other hand, the mechanical properties of duplex stainless steel are also affected...

Claims

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Application Information

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IPC IPC(8): B22D11/06B21B1/46C21D8/02C22C38/02C22C38/04C22C38/42C22C38/44
CPCB22D11/0611B21B1/463C21D8/0205C21D8/0236C21D8/0226C21D8/0263C22C38/02C22C38/04C22C38/42C22C38/44C22C38/001
Inventor 陈雷郝硕彭程王永鑫李志国
Owner YANSHAN UNIV
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