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Near-net shaping preparation method of super double-phased stainless steel thin strip

A duplex stainless steel, near-net-shape forming technology, applied in the field of steel alloy materials, can solve the problems of element segregation, difficulty in hot processing preparation, and difficulty in preparing thin-gauge products, achieve high deformation resistance, omit secondary heating, and improve thermal The effect of rolling edge cracks and surface cracking defects

Inactive Publication Date: 2018-03-23
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Aiming at the problems of easy element segregation in super duplex stainless steel slabs, difficulties in hot processing and preparation of thin-gauge products, the invention provides a near-net forming preparation method for super duplex stainless steel thin strips. Method for preparing super duplex stainless steel thin-gauge products with high alloy content by "thin strip continuous casting + online hot rolling + cold rolling" technology

Method used

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  • Near-net shaping preparation method of super double-phased stainless steel thin strip
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  • Near-net shaping preparation method of super double-phased stainless steel thin strip

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preparation example Construction

[0037]The preparation method of the super duplex stainless steel thin strip involved in the present invention adopts the twin-roll thin strip continuous casting technology to obtain a thin strip of 1.5-3.5 mm without edge cracks and good plate shape, and then undergoes on-line hot rolling and pickling one by one. Through the multi-pass cold rolling process, a thin cold-rolled strip with good surface quality and no edge cracks is finally obtained with a plate thickness of about 0.3-1.0 mm. Through appropriate solution treatment, the ratio of austenite to ferrite can be close to 1. : 1, the obtained thin strip has good mechanical properties and excellent corrosion resistance, and the product performance can reach or even exceed the same level of products prepared by conventional techniques. Meanwhile, compared to conventional techniques, the preparation method involved in the present invention , its finished product rate is greatly improved, and energy consumption is greatly redu...

Embodiment 1

[0049] The composition of super duplex stainless steel thin strip is: C=0.012%; Cr=25.1%; Ni=7.10%; Mn=1.40%; Mo=3.02%; N=0.32%; Avoid impurities.

[0050] The near net forming preparation method of the super duplex stainless steel thin strip of the present invention specifically comprises the following steps:

[0051] (1) Strip continuous casting to obtain a thin strip billet. According to the composition ratio of the super duplex stainless steel strip involved in the present invention, in the melting furnace, add electrolytic chromium, molybdenum, nickel and pure iron, heat under an argon protective atmosphere, and pass high-purity nitrogen into it after melting For protection, then add electrolytic manganese and Fe(CrN) alloy, all melted to get molten steel poured into the tundish, the molten steel flows into the cavity between the two counter-rotating crystallization rollers and the side sealing plate through the tundish, forming a stable The molten pool and the molten s...

Embodiment 2

[0059] The composition of super duplex stainless steel thin strip is: C=0.015%; Cr=27.3%; Ni=7.86%; Mn=1.80%; Mo=2.53%; N=0.35%; Avoid impurities.

[0060] The near net forming preparation method of the super duplex stainless steel thin strip of the present invention specifically comprises the following steps:

[0061] (1) Strip continuous casting to obtain a thin strip billet. According to the composition ratio of the super duplex stainless steel strip involved in the present invention, in the melting furnace, add electrolytic chromium, molybdenum, nickel and pure iron, heat under an argon protective atmosphere, and pass high-purity nitrogen into it after melting For protection, then add electrolytic manganese and Fe(CrN) alloy, all melted to get molten steel poured into the tundish, the molten steel flows into the cavity between the two counter-rotating crystallization rollers and the side sealing plate through the tundish, forming a stable The molten pool and the molten s...

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Abstract

The invention discloses a near-net shaping preparation method of a super double-phased stainless steel thin strip. The super double-phased stainless steel thin strip is composed of, by mass, 0-0.03% of C, 24-32% of Cr, 0.5-2.5% of Mn, 0.3-0.5% of N, 2-6% of Mo, 4-8% of Ni, and the balance Fe and other inevitable impurities. The preparation method comprises the following steps that (1) a thin stripbillet is obtained through smelting and thin strip continuous casting, and the smelting temperature is 1530-1570 DEG C; (2) online hot rolling is conducted, and the hot rolling rate is 20-30%; (3) acid pickling is conducted; (4) cold rolling is conducted and the cold rolling overall reduction is 60-85%; and (5) solution treatment is conducted. The obtained thin strip has the good mechanical performance and excellent corrosion resistance, and compared with a conventional process, the yield is greatly improved, and energy consumption is greatly reduced.

Description

technical field [0001] The invention relates to a near net forming preparation method of a super duplex stainless steel thin strip, belonging to the technical field of iron and steel alloy materials. Background technique [0002] Duplex stainless steel refers to the type of stainless steel whose microstructure is composed of ferrite (α) and austenite (γ). Its performance has the characteristics of both ferritic stainless steel and austenitic stainless steel. It is widely used in many fields such as chemical industry and ocean. Super duplex stainless steel is an improved new generation of duplex stainless steel, which has higher corrosion resistance and better mechanical properties, especially high yield strength, and is especially suitable for some severe corrosive environments. [0003] However, super duplex stainless steel still has the following problems: [0004] 1. The content of alloying elements is large, and the brittle phase precipitates quickly, so the actual pro...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/04C22C38/44C21D8/02
CPCC22C38/58C21D8/0226C21D8/0236C21D8/0247C21D2211/001C21D2211/005C22C38/001C22C38/04C22C38/44
Inventor 刘振宇赵岩李健李鑫王源李成刚曹光明王国栋
Owner NORTHEASTERN UNIV
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