High nitrogen and low nickel duplex stainless steel and manufacturing method thereof

A technology of duplex stainless steel and manufacturing method, which is applied in the field of metallurgy, can solve problems such as nodules, increasing hard inclusions, affecting product surface quality, etc., and achieves the effect of convenient production and low cost

Active Publication Date: 2009-12-30
BAOSTEEL SPECIAL STEEL CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, in large-scale production, because Al is easily oxidized to form aluminum oxide or nitride, it not only causes nodules during the casting process, but also increases the hard inclusions in the steel, which seriously affects the surface quality of the product.

Method used

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  • High nitrogen and low nickel duplex stainless steel and manufacturing method thereof
  • High nitrogen and low nickel duplex stainless steel and manufacturing method thereof
  • High nitrogen and low nickel duplex stainless steel and manufacturing method thereof

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Embodiment Construction

[0030] This embodiment takes the production process of electric furnace-AOD smelting as an example: put ferrochromium, ferronickel and scrap steel into the electric furnace for melting, and after melting, the molten steel is put into the AOD furnace, and de-C, de-S and N-increasing and N-controlled blowing, when the smelting composition meets the requirements, the molten steel is poured into the tundish and cast on the vertical bending continuous casting machine. The casting superheat is 30-100°C, and the slab casting speed is 0.8-2m / min. Put the continuous casting slab into the rolling bottom feeding furnace and heat it to 1100-1250°C, roll it to the required thickness on the hot continuous rolling mill, and then coil it. Then carry out continuous pickling annealing, the annealing temperature is 950-1030°C, which is 20-100°C lower than the usual annealing temperature of duplex stainless steel, so as to ensure that the austenite content in the alloy is greater than 50%, so as ...

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Abstract

The invention discloses high nitrogen and low nickel duplex stainless steel and a manufacturing method thereof. The duplex stainless steel comprises the following chemical compositions in percentage by weight: 0.01 to 0.10 percent of C, 0.2 to 1.0 percent of Si, 4.0 to 12.0 percent of Mn, 18.0 to 23.0 percent of Cr, more than or equal to 0.2 percent and less than 1.0 percent of Ni, 0.2 to 0.4 percent of N, less than or equal to 1.0 percent of one or more of Mo, W and Cu, and the balance of Fe and inevitable impurities. Because the content of the Ni element is more than or equal to 0.2 percent and less than 1.0 percent, a temperature 20 to 100 DEG C lower than the conventional annealing temperature is adopted, namely an annealing treatment process between 950 and 1,030 DEG C is adopted so as to effectively reduce production cost; meanwhile, the duplex stainless steel still maintains high strength, excellent room temperature impact property and corrosion resistance, and can be massively applied to the fields such as coastal buildings, petrochemical industry and the like; meanwhile, preparation and heat treatment processes are simple, and the production is convenient.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a composition and a manufacturing process of a duplex stainless steel. Background technique [0002] Duplex stainless steel is composed of ferrite and austenite, and the proportion of each phase is not less than 30%. Due to the characteristics of the two-phase structure, duplex stainless steel has the advantages of both ferritic stainless steel and austenitic stainless steel. Compared with ferritic stainless steel, it has high toughness, low brittle transition temperature, intergranular corrosion resistance and good welding performance. At the same time, the advantages of high thermal conductivity and small expansion coefficient of ferritic steel are retained. Compared with austenitic stainless steel, its yield strength is significantly improved, and its resistance to chloride stress corrosion cracking is significantly higher than that of 300 series austenitic stainless steel. It also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C21D1/26B22D11/14
Inventor 宋红梅张伟胡锦程王治宇崔健江来珠
Owner BAOSTEEL SPECIAL STEEL CO LTD
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