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A duplex stainless steel thin strip and its near-net forming preparation method

A duplex stainless steel, near-net forming technology, applied in the field of steel alloy materials, to achieve the effect of ensuring stability, simplifying the production process, and improving the yield

Active Publication Date: 2017-06-13
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The duplex stainless steel still has a considerable amount of precious elements such as Ni, and the N content is also below 0.3%. Although the elongation rate reaches more than 55%, the strength is all below 850MPa, and the manganese-nitrogen alloying has not been fully utilized to improve performance and performance. Important advantages in terms of cost reduction

Method used

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  • A duplex stainless steel thin strip and its near-net forming preparation method
  • A duplex stainless steel thin strip and its near-net forming preparation method
  • A duplex stainless steel thin strip and its near-net forming preparation method

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Effect test

Embodiment 1

[0049] The composition of the duplex stainless steel thin strip of the present invention is: C = 0.018%; Cr = 18.9%; Ni = 0.052%; Mn = 6.3%; N = 0.38%; the balance is iron and other inevitable impurities.

[0050] A near-net-forming preparation method for a duplex stainless steel thin strip, specifically comprising the following steps:

[0051] Step 1, smelting:

[0052] Under the atmosphere of nitrogen, the pressure of the melting furnace is 1.0 atm. According to the composition ratio of the duplex stainless steel strip, the electrolytic chromium, electrolytic manganese and pure iron are first smelted at 1475 ° C, and then Fe (CrN) alloy is added after melting. The molten steel obtained by smelting is cast into a tundish, wherein the smelting is carried out under a nitrogen atmosphere, pressurized to suppress volatilization of manganese and nitrogen, and increase the yield of manganese and nitrogen;

[0053] Step 2, thin strip continuous casting:

[0054] The molten steel i...

Embodiment 2

[0067] The composition of duplex stainless steel thin strip is: C=0.021%; Cr=19.6%; Ni=0.045%; Mn=5.6%; N=0.31%; the balance is iron and other unavoidable impurities.

[0068] A near-net-forming preparation method for a duplex stainless steel thin strip, specifically comprising the following steps:

[0069] Step 1, smelting:

[0070] Under a nitrogen atmosphere, the pressure of the melting furnace is 1.0 atm. According to the composition ratio of the duplex stainless steel strip, electrolytic chromium, electrolytic manganese and pure iron are first melted at 1500 ° C, and then Fe (CrN) alloy is added after melting. The molten steel obtained by smelting is cast into a tundish, wherein the smelting is carried out under a nitrogen atmosphere, pressurized to suppress volatilization of manganese and nitrogen, and increase the yield of manganese and nitrogen;

[0071] Step 2, thin strip continuous casting:

[0072] The molten steel in the tundish flows into the molten pool, and th...

Embodiment 3

[0085] The composition of duplex stainless steel thin strip is: C=0.014%; Cr=20.3%; Ni=0.032%; Mn=6.8%; N=0.45%; the balance is iron and other unavoidable impurities.

[0086] A near-net-forming preparation method for a duplex stainless steel thin strip, specifically comprising the following steps:

[0087] Step 1, smelting:

[0088] Under nitrogen atmosphere, the pressure of the smelting furnace is 1.0atm. According to the composition ratio of the duplex stainless steel strip, electrolytic chromium, electrolytic manganese and pure iron are first smelted at 1470°C, and then Fe(CrN) alloy is added after melting. The molten steel obtained by smelting is cast into a tundish, wherein the smelting is carried out under a nitrogen atmosphere, pressurized to suppress volatilization of manganese and nitrogen, and increase the yield of manganese and nitrogen;

[0089] Step 2, thin strip continuous casting:

[0090] The molten steel in the tundish flows into the molten pool, and the mo...

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Abstract

The invention provides a duplex stainless steel thin strip and a near-net shaping preparation method thereof, and belongs to the technical field of steel alloy materials. The duplex stainless steel thin strip comprises, by mass, 0.0001%-0.03% of C, 18%-22% of Cr, 5%-7% of Mn, 0.3%-0.45% of N, 0.0001%-0.1% of Ni, and the balance iron and other inevitable impurities. The preparation method includes the steps that (1) smelting is carried out under nitrogen; (2) molten steel is guided out along with rotation of crystallizing rollers to form a cast strip, and the cast strip is cooled to the room temperature through water; (3) hot rolling is carried out for 1-2 passes, and the strip is cooled to the room temperature through water; (4) the hot-rolled stainless steel thin strip is subjected to acid pickling; (5) the stainless steel thin strip is cold-rolled; and (6) a finished product is obtained after solution annealing. The duplex stainless steel thin strip prepared through the method has a good corrosion property; the initial as-cast structure is refined, and a good property can be obtained in subsequent processing; according to the preparation method, segregation of elements is restrained, and the alloy elements can be distributed more evenly after subsequent rolling and solution annealing; cost is low, and the production process is simple and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of iron and steel alloy materials, and in particular relates to a duplex stainless steel thin strip and a near net forming preparation method thereof. Background technique [0002] The microstructure of duplex stainless steel in use is composed of ferrite and austenite phases, each accounting for about 50%, so it has the characteristics of both austenitic stainless steel and ferritic stainless steel. Vigorously develop economical duplex stainless steel to replace austenitic stainless steel such as 304 or even 316L to achieve the purpose of saving resources and reducing costs. Compared with the traditional duplex stainless steel, due to the higher N content of the duplex stainless steel "substituting Mn+N for Ni", it is prone to porosity defects when cast into ingots, which affects the yield and causes a great waste of resources. Compared with conventional duplex stainless steel, economical duplex stainless ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C21D8/02B22D11/06
CPCB22D11/0622C21D8/0226C21D8/0236C21D8/0247C21D2211/001C21D2211/005C22C38/001C22C38/58
Inventor 刘振宇赵岩高飞郝燕森刘鑫李成刚曹光明王国栋
Owner NORTHEASTERN UNIV LIAONING
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