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Smelting method for non-magnetic stainless steel

A technology of non-magnetic stainless steel and smelting method, which is applied to the improvement of process efficiency, furnace type, furnace and other directions, can solve the problems of large amount of scrap, high scrap rate, poor rolling plasticity, etc. The effect of increasing rolling plasticity and reducing wire-cracked waste

Active Publication Date: 2014-12-03
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Abstract
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Problems solved by technology

[0002] The main steel types of non-magnetic stainless steel are 0Cr16Ni14 and 0Cr18Ni12. The nickel content in molten steel is relatively high, and the structure is mainly austenite. The steel is sensitive to inclusions, and the rolling plasticity is poor. Linear defects are easily produced on the surface after rolling, and the amount of waste is large. , the rejection rate is as high as 60%
The existing non-magnetic stainless steel smelting method generally adopts the electric furnace-AOD (VOD)-LF furnace-continuous casting process. The main control difficulty is that the enrichment of steel intergranular [S] leads to poor plasticity, and the surface after rolling is linear. streak defect

Method used

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Embodiment 1

[0024] The type of steel smelted in this embodiment is 0Cr16Ni14 with a weight of 165 tons. The process route of this embodiment is: electric furnace smelting—AOD—LF—continuous casting

[0025] This embodiment includes the following steps in sequence:

[0026] Ⅰ Electric furnace smelting

[0027] For electric furnaces, purchased and returned steel scrap and various alloy ingredients, the cleared value must meet the following requirements:

[0028] C 1.6%; Cr 18.5%; Ni 9.5%; P 0.001%;

[0029] The rest is Fe and unavoidable impurities.

[0030] The temperature of molten steel for electric furnace smelting is 1650°C, and the steel is tapped when the mass percentage of the composition of molten steel reaches the following requirements:

[0031] C 1.6%; Cr 18.5%; Ni 9.5%; P 0.001%;

[0032] The rest is Fe and unavoidable impurities.

[0033] After tapping, it is added to the AOD furnace. The temperature of molt...

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Abstract

The invention relates to a smelting method for non-magnetic stainless steel. The smelting method comprises the following steps in sequence: I, electric furnace smelting: tapping when components of molten steel meet the following requirements that the content of C is 1.2 to 2.0 percent, the content of Cr is 18 to 19 percent, the content of Ni is 9 to 10 percent, the content of P is less than or equal to 0.02 percent and the balance is Fe and inevitable impurities; II, argon oxygen decarburization (AOD) smelting: blowing oxygen into the molten steel in an AOD furnace, heating and decarbonizing until the content of C is less than or equal to 0.02 percent, adding ferrosilicon for reduction, removing pre-reducing slag until the binary basicity of the reducing slag is 1.8 to 2.0 percent, adding 8 to 10 kg of lime into per ton of molten steel to generate new slag after slag removal, regulating the slag by using 10 to 20 kg of Ca-Si powder and 10 to 20 kg of Al powder until the slag is light green or yellowish white, blowing argon to slag for at least 4 minutes to ensure that the content of S in the molten steel is less than or equal to 0.001 percent; III, LF (ladle furnace) smelting: heating the molten steel by using electricity when the molten steel reaches an LF station, feeding the molten steel to a Ca-Si line, adding ferroboron, and blowing the argon with stirring; and IV, continuous casting. According to the stainless steel which is prepared by using the smelting method for the non-magnetic stainless steel, the occupied positions of S among steel crystals are reduced, and the plasticity of the stainless steel is improved.

Description

technical field [0001] The invention relates to a method for smelting non-magnetic stainless steel. Background technique [0002] The main steel types of non-magnetic stainless steel are 0Cr16Ni14 and 0Cr18Ni12. The nickel content in molten steel is relatively high, and the structure is mainly austenite. The steel is sensitive to inclusions, and the rolling plasticity is poor. Linear defects are easily produced on the surface after rolling, and the amount of waste is large. , The rejection rate is as high as 60%. The existing non-magnetic stainless steel smelting method generally adopts the electric furnace-AOD (VOD)-LF furnace-continuous casting process. The main control difficulty is that the enrichment of steel intergranular [S] leads to poor plasticity, and the surface after rolling is linear. Streak defects. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of the existing non-magnetic stainless steel smelting methods, the pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/068C21C7/072C21C5/52
CPCY02P10/20
Inventor 赵晓明赵大同李谦谢恩敬段鹏飞刘明生张海英
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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