A kind of economical duplex stainless steel thin plate and its preparation method

A duplex stainless steel, energy-saving technology, applied in the field of steel rolling, can solve the problems of hindering industrial production, poor coordination of deformation, and affecting the yield of finished products, and achieve the effects of reducing the difficulty of preparation, excellent strong plasticity, and reducing raw material costs

Active Publication Date: 2017-10-31
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high N content of the duplex stainless steel, it is easy to produce porosity defects when casting into ingots, which affects the yield and causes a great waste of resources.
At the same time, the difference in the distribution of alloying elements in high-temperature austenite and high-temperature ferrite leads to a large difference in high-temperature hardness, poor deformation coordination during hot deformation, easy cracking during hot rolling, and a serious reduction in yield, which hinders industrial production

Method used

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  • A kind of economical duplex stainless steel thin plate and its preparation method
  • A kind of economical duplex stainless steel thin plate and its preparation method
  • A kind of economical duplex stainless steel thin plate and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] An economical duplex stainless steel sheet, the composition of which is: C=0.11%; Cr=21.3%; Mn=4.6%; Ni=1.1%; Mo=0.4%; N=0.16%; the balance is iron and other unavoidable impurities.

[0026] The preparation method of the above-mentioned economical duplex stainless steel sheet, the specific steps are:

[0027] (1) According to the chemical composition of C=0.11%, Cr=21.3%, Mn=4.6%, Ni=1.1%, Mo=0.4%, N=0.16%, the balance is iron and other unavoidable impurities. Chromium, electrolytic manganese, pure iron, molybdenum, nickel, T10 carbon steel and Fe(CrN) alloy, first smelt electrolytic chromium, pure iron, molybdenum, nickel and T10 carbon steel, then add electrolytic manganese and Fe(CrN) ) alloy smelting to obtain molten steel;

[0028] (2) Cast molten steel into the mold, and control the casting temperature to 1500°C;

[0029] (3) The riser part of the ingot is cut off, and the billet is hot-rolled for 5 passes, the billet billet temperature is 1200°C, the billet re...

Embodiment 2

[0036] An economical duplex stainless steel sheet, its composition according to the mass percentage is: C=0.08%; Cr=20.1%; Mn=4.2%; Ni=0.9%; Mo=0.5%; N=0.18%; the balance is iron and other unavoidable impurities.

[0037] The preparation method of the above-mentioned economical duplex stainless steel sheet, the specific steps are:

[0038](1) According to the chemical composition of C=0.08%, Cr=20.1%, Mn=4.2%, Ni=0.9%, Mo=0.5%, N=0.18%, the balance is iron and other unavoidable impurities. Chromium, electrolytic manganese, pure iron, molybdenum, nickel, T10 carbon steel and Fe(CrN) alloy, first smelt electrolytic chromium, pure iron, molybdenum, nickel and T10 carbon steel, then add electrolytic manganese and Fe(CrN) ) alloy smelting to obtain molten steel;

[0039] (2) Cast molten steel into the mold, and control the casting temperature to 1480°C;

[0040] (3) The riser part of the ingot is cut off, and the billet is hot-rolled for 5 passes, the billet billet temperature i...

Embodiment 3

[0046] An economical duplex stainless steel sheet, the composition of which is: C=0.13%; Cr=22.8%; Mn=5.7%; Ni=0.5%; Mo=0.4%; N=0.22%; the balance is iron and other unavoidable impurities.

[0047] The preparation method of the above-mentioned economical duplex stainless steel sheet, the specific steps are:

[0048] (1) According to the chemical composition of C=0.13%, Cr=22.8%, Mn=5.7%, Ni=0.5%, Mo=0.4%, N=0.22%, the balance is iron and other unavoidable impurities. Chromium, electrolytic manganese, pure iron, molybdenum, nickel, T10 carbon steel and Fe(CrN) alloy, first smelt electrolytic chromium, pure iron, molybdenum, nickel and T10 carbon steel, then add electrolytic manganese and Fe(CrN) ) alloy smelting to obtain molten steel;

[0049] (2) Cast molten steel into the mold, and control the casting temperature to 1530°C;

[0050] (3) The riser part of the ingot is cut off, and the billet is opened by hot rolling for 3 passes, the billet opening temperature is 1200°C, t...

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Abstract

The invention discloses an economical duplex stainless steel sheet and a preparation method thereof. The stainless steel sheet comprises the following components in percentage by mass: 0.08 to 0.13 percent of C, 20 to 23 percent of Cr, 4 to 6 percent of Mn, 0.5 to 1.5 percent of Ni, 0.2 to 0.5 percent of Mo, 0.1 to 0.25 percent of N and the balance of iron and other inevitable impurities. The preparation method comprises the following steps: selecting and melting a raw material into molten steel according to the components; casting the molten steel into an ingot; performing hot rolling cogging and surface figuring on the ingot after a riser part is cut; performing hot rolling to obtain a hot-rolled plate with a thickness of 3 to 6mm; performing annealing, acid washing and cold rolling on the hot-rolled plate to obtain a sheet with a thickness of 1 to 1.5mm; performing solution annealing to obtain the economical duplex stainless steel sheet. According to the economical duplex stainless steel sheet and the preparation method thereof, by reasonable alloying design, the strength and the plasticity of the stainless steel sheet can be improved, hot rolling edge cracking can be eliminated, and the quality and the yield of the hot-rolled plate are greatly improved.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to an economical duplex stainless steel thin plate and a preparation method thereof. Background technique [0002] Duplex stainless steel is composed of ferrite and austenite phases, the ratio of the two phases is close to 1:1, and it has the excellent characteristics of both austenitic stainless steel and ferritic stainless steel. The current research focus is on vigorously developing economical duplex stainless steel to replace austenitic stainless steel such as 304 or even 316L, so as to save resources and reduce costs. [0003] LDX2101 duplex stainless steel sheet has become a research hotspot in recent years. Compared with traditional duplex stainless steel, this economical duplex stainless steel adopts the alloying design of "Mn+N" instead of "Ni", which can greatly reduce the production cost. However, due to the high N content of the duplex stainless steel, porosity de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/44C22C33/06C21D8/02
CPCC21D8/0226C21D8/0236C21D8/0247C21D2211/001C21D2211/005C22C33/06C22C38/001C22C38/44C22C38/58
Inventor 刘振宇赵岩刘鑫焦也朱振李成刚曹光明王国栋
Owner NORTHEASTERN UNIV LIAONING
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