High-nitrogen nickel-saving type duplex stainless steel thin strip and preparation method thereof

A technology of duplex stainless steel and stainless steel, which is applied in the field of steel rolling, can solve problems such as poor strength and corrosion resistance of duplex stainless steel strips, poor coordination of two-phase deformation, and pore defects, and achieve excellent mechanical properties and corrosion resistance. Effect of element segregation and simplification of hot rolling process

Active Publication Date: 2016-09-07
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the increase of nitrogen in stainless steel, the difficulty of smelting and rolling increases. When the nitrogen content exceeds 0.2%, the slab is prone to porosity defects in production, and the deformation coordination of the two phases becomes weaker during hot deformation. Worse, edge cracks or even surface cracks are prone to occur during hot rolling
[0005] Patent CN103987867 proposes a strip continuous casting technology to prepare an economical duplex stainless steel strip containing 19-23% Cr, 0.2-0.3% N, 2-4% Mn, and 0.3-2.5% Ni. Has a high elongation, but the economical duplex stainless steel strip has relatively poor strength and corrosion resistance

Method used

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  • High-nitrogen nickel-saving type duplex stainless steel thin strip and preparation method thereof
  • High-nitrogen nickel-saving type duplex stainless steel thin strip and preparation method thereof
  • High-nitrogen nickel-saving type duplex stainless steel thin strip and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A high-nitrogen nickel-free duplex stainless steel thin strip, the composition of which is: C=0.015%; Cr=23.2%; Ni=0.01%; Mn=7.1%; N=0.56%; the balance is iron and others unavoidable impurities. The specific preparation process is as figure 1 shown, follow the steps below:

[0028] (1) Select electrolytic chromium, electrolytic manganese, For pure iron and Fe(CrN) alloy, electrolytic chromium, electrolytic manganese and pure iron are smelted first, and then Fe(CrN) alloy is added for smelting to obtain molten steel;

[0029] (2) Pouring molten steel into the tundish at a pouring temperature of 1500°C;

[0030] (3) Introduce the molten steel into the molten pool, so that the molten steel is exported with the rotation of the crystallization roller to form a casting belt, wherein the rotation speed of the crystallization roller is 40m / min, and the cooling rate is ≥10 3 °C / s; the cast strip is water-cooled to room temperature within 10s after it comes out of the roll, a...

Embodiment 2

[0036] A high-nitrogen nickel-free duplex stainless steel thin strip, the composition of which is: C=0.02%; Cr=22.4%; Ni=0.03%; Mn=7.5%; N=0.48%; the balance is iron and others unavoidable impurities. The specific preparation process is as figure 1 shown, follow the steps below:

[0037] (1) Select electrolytic chromium, electrolytic manganese, For pure iron and Fe(CrN) alloy, electrolytic chromium, electrolytic manganese and pure iron are smelted first, and then Fe(CrN) alloy is added for smelting to obtain molten steel;

[0038] (2) Pouring molten steel into the tundish at a pouring temperature of 1480°C;

[0039] (3) Introduce the molten steel into the molten pool, so that the molten steel is exported with the rotation of the crystallization roller to form a casting belt, wherein the rotation speed of the crystallization roller is 50m / min, and the cooling rate is ≥10 3 °C / s; the cast strip is water-cooled to room temperature within 10s after it comes out of the roll, an...

Embodiment 3

[0045] A high-nitrogen nickel-free duplex stainless steel thin strip, the composition of which is: C=0.018%; Cr=25.1%; Ni=0.02%; Mn=9.7%; N=0.62%; the balance is iron and others unavoidable impurities. The specific preparation process is as figure 1 shown, follow the steps below:

[0046] (1) Select electrolytic chromium, electrolytic manganese, For pure iron and Fe(CrN) alloy, electrolytic chromium, electrolytic manganese and pure iron are smelted first, and then Fe(CrN) alloy is added for smelting to obtain molten steel;

[0047] (2) Pouring molten steel into the tundish at a pouring temperature of 1520°C;

[0048] (3) Introduce the molten steel into the molten pool, so that the molten steel is exported with the rotation of the crystallization roller to form a casting belt, wherein the rotation speed of the crystallization roller is 60m / min, and the cooling rate is ≥10 3 °C / s; the cast strip is water-cooled to room temperature within 10s after it comes out of the roll, a...

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Abstract

The invention provides a high-nitrogen nickel-saving type duplex stainless steel thin strip and a preparation method thereof. The high-nitrogen nickel-saving type duplex stainless steel thin strip comprises, by mass, 0.0001%-0.03% of C, 22.1%-26.0% of Cr, 7.1%-10% of Mn, 0.46%-0.7% of N, 0.0001%-0.1% of Ni and the balance Fe and other inevitable impurities. The preparation method comprises the steps that firstly, materials are selected and proportioned according to the components, and molten steel is obtained through melting; secondly, the molten steel is poured into a tundish; thirdly, thin strip continuous casting is conducted on the molten steel, so that a cast strip with the thickness being 2-4 mm is formed; fourthly, hot rolling is conducted on the cast strip by 1-2 passes, so that an edge crack-free hot-rolled stainless steel strip with the thickness being 1.6-2.4 mm is obtained; fifthly, the hot-rolled stainless steel strip is pickled in sequence, and cold rolling is conducted after a surface oxidation layer is removed, so that a cold-rolled stainless steel thin strip with the thickness being 0.4-1.0 mm is obtained; and finally, solution treatment is conducted, and then the high-nitrogen nickel-saving type duplex stainless steel thin strip is obtained.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a high-nitrogen and nickel-saving duplex stainless steel thin strip and a preparation method thereof. Background technique [0002] Duplex stainless steel is named because the microstructure is composed of almost equal proportions of ferrite and austenite, usually with ferrite as the matrix (volume fraction between 50 and 70%), and the rest is austenite, so It belongs to the type of ferritic-austenitic dual phase steel. This kind of steel often contains high Cr (18~30%), medium Ni (4~10%) and low carbon (≤0.03%), and can also contain Mo or other elements (such as Cu, W). Duplex stainless steel has the characteristics of both ferritic stainless steel and austenitic stainless steel. The presence of austenite reduces the brittleness of ferritic stainless steel, improves toughness and weldability, and the presence of ferrite improves the austenite The room temperature strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58B22D11/06C21D8/02
CPCB22D11/002B22D11/0622C21D8/0226C21D8/0236C21D2211/001C21D2211/005C22C38/001C22C38/004C22C38/58
Inventor 刘振宇赵岩郝燕森焦也朱振刘鑫李成刚曹光明王国栋
Owner NORTHEASTERN UNIV
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