Smelting method of high-purity and high-nitrogen duplex stainless steel
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A technology of duplex stainless steel and smelting method, applied in the field of stainless steel smelting, can solve the problem of high production cost, and achieve the effects of low production cost, good effect and low cost
Inactive Publication Date: 2013-01-23
CENT IRON & STEEL RES INST
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[0006] The purpose of the present invention is to provide a method for smelting high-purity hig
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Embodiment 1
[0019] Example 1: Comparison of the effects of smelting 2507Mo3N duplex stainless steel by using ferrochromium nitride nitrogen-increasing method and this patented method
[0020] Graphite carbon, pure chromium, pure molybdenum, pure nickel, pure iron, aluminum, silicon, manganese and ferrochromium nitride are used for raw material ratio, and ferrochromium nitride is used for smelting: pure iron, pure chromium, pure Add nickel, pure molybdenum, silicon and pot carbon into the crucible of the vacuum induction furnace. After vacuuming to 35Pa, adjust the power of 50kw to heat until the furnace material is completely melted and then smelt for 12 minutes, and then put the pure aluminum material in the bucket of the induction furnace. After deoxidation, it is filled with argon gas for protection, and then put into the bucket of pure manganese, bucket carbon and ferrochromium nitride to deoxidize and adjust the nitrogen content in the steel. After power failure and temperature adjus...
Embodiment 2
[0026] Example 2: Smelting high-nitrogen duplex stainless steel with different components by using the patented method:
[0027] Graphite carbon, pure chromium, pure molybdenum, pure nickel, pure iron, aluminum, silicon, and manganese are used for raw material ratio to start smelting: add pure iron, pure chromium, pure nickel, pure molybdenum, silicon, and pot carbon into the vacuum induction furnace In the crucible, after evacuating to 35Pa, adjust the power of 50kw to heat until the charge is completely melted and melt for 10 minutes, and then put the pure aluminum material in the bucket of the induction furnace into it. At this time, high-purity nitrogen gas is slowly introduced, and the nitrogen pressure is controlled to be 0.60 MPa, and the power is adjusted to 20 kw for further refining for 12 minutes. After refining, put the pure manganese and bucket carbon into the bucket for deoxidation. After power failure and temperature adjustment, the steel was tapped and smelted...
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Abstract
The invention discloses a smelting method of high-purity and high-nitrogen duplex stainless steel, relating to the technical field of stainless steel smelting. According to the smelting method disclosed by the invention, the high-purity and high-nitrogen duplex stainless steel is smelted through a composite process of molten steel vacuum melting and nitrogen filling refining, and the nitrogen content of the high-nitrogen duplex stainless steel is adjusted by controlling the nitrogen pressure during nitrogen filling and the refining time of nitrogen filling. The high-nitrogen duplex stainless steel comprises the following components in percentage by weight: 20-30 percent of Cr, 5-9 percent of Ni, 2-5 percent of Mo, 0.15-0.50 percent of N and the balance of Fe and inevitable impurities. The nitrogen pressure controlling range during smelting is 0.35-0.70MPa, the melting time is 5-20min, the refining maintaining nitrogen pressure is 0.35-0.70MPa, and the refining time is 10-30min. The smelting method has the advantages that compared with the traditional smelting method, with the adoption of the smelting method, the operation is easy, the nitrogen content in the steel can be accurately adjusted, the production cost is low through smelting under the normal pressure or the negative pressure, and the purity of the smelted steel is higher.
Description
technical field [0001] The invention relates to the technical field of stainless steel smelting, and in particular provides a method for smelting high-purity, high-nitrogen duplex stainless steel. Background technique [0002] Stainless steel is mainly divided into five categories: austenitic stainless steel, ferritic stainless steel, duplex stainless steel, martensitic stainless steel and precipitation hardening stainless steel. Duplex stainless steel has become a new development hotspot due to its austenite + ferrite two-phase structure, high strength and excellent corrosion resistance. [0003] Nitrogen is a strong austenite phase forming element. In duplex stainless steel, it has the ability to expand and stabilize austenite structure. In terms of contribution to austenite formation, nitrogen equivalent is 30 times that of nickel equivalent. With the addition of nitrogen, the general corrosion resistance, pitting corrosion, stress corrosion and intergranular corrosion r...
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