Smelting method for non-magnetic stainless steel

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...

AI Technical Summary

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