Smelting and casting process for smelting high-nitrogen non-magnetic stainless steel by using argon oxygen furnace

A non-magnetic stainless steel technology using an argon-oxygen furnace, which is applied in the field of smelting and casting technology, can solve the problems of high cost and backward smelting and casting technology, and achieve the effects of increasing effective utilization, reducing production costs, and saving costs

Inactive Publication Date: 2018-11-23
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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AI Technical Summary

Problems solved by technology

The research and development of domestic high-carbon non-magnetic stainless steel is relatively late. Most of the grades produced on the market imitate the mature grades abroad. Some steel grades are still in the experimental stage. Generally, the cost is high, and the smelting and casting technology is relatively backward.

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: The present invention adopts the process route of IF~AOD~IC, and the process is according to the process route of IF~AOD~IC, and the specific components are controlled as follows according to weight percentage: [C]≤0.03%, [Si]≤1.0%, [ Mn]≤19~23%, [P]≤0.030%, [S]≤0.010%, [Ni]: 1.40~3.00%, [Cr]: 18~24%, [N]: 0.60~1.0%, [ Mo]: 0.50 to 2.50%.

[0013] The steps of the smelting process are as follows:

[0014] Step 1), intermediate frequency furnace melting and returning material head 510~530kg / t, high carbon ferrochrome 300~320kg / t, molybdenum iron 8~40kg / t, electrolytic nickel 14~30kg / t, recarburizer 5~10kg / t , the temperature is greater than or equal to 1560 ° C, sampling and tapping into the argon-oxygen furnace, the tapping temperature is controlled between 1600 and 1650 ° C; the material head used must be free of oil and rust, and ensure that P≤0.020% (the content of Cr is 10% larger The above can be relaxed to 0.025%), and the ingredients are based on ...

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PUM

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Abstract

The invention relates to a smelting and casting process for smelting high-nitrogen non-magnetic stainless steel by using an argon oxygen furnace. The process comprises the following steps: firstly, melting 510-530kg/t of returned stub bars, 300-320kg/t of high-carbon ferrochrome, 8-40kg/t of ferromolybdenum, 14-30kg/t of electrolytic nickel and 5-10kg/t of carburant by using an intermediate frequency furnace, sampling the steel when the temperature is greater than or equal to 1560 DEG C, and then, putting the steel into the argon oxygen furnace; then, supplementing alloy into the argon oxygenfurnace according to the sampling result, performing decarburization to be less than 0.01%, adding 10-25kg/t of special ferrosilicon for reduction, adding 200-240 kg/t of electrolytic manganese, adding 5-10kg/t of aluminum, raising the temperature, and adding 20-30kg/t of ferromanganese nitride alloy in two batches; discharging the steel into a steel ladle; and transferring the steel to a pouringstation to be molded by pouring by adopting a top pouring method, and adding 0.5-1kg/t of protecting slag into the mold. The process provided by the invention is environment-friendly and low in cost and increases the utilization ratio of molten steel by 8%; and by adding the protecting slag into the mold, the surface quality of an electrode blank is ensured, and mold release is facilitated.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and relates to a smelting and casting process for smelting high-nitrogen non-magnetic stainless steel using an argon-oxygen furnace. Background technique [0002] High-nitrogen non-magnetic stainless steel has high strength and good corrosion resistance, and its structure is austenite. It is widely used in oil exploration, offshore platforms, military industry and other fields. The research and development of domestic high-carbon non-magnetic stainless steel is relatively late. Most of the grades produced on the market imitate the mature grades abroad. Some steel grades are still in the experimental stage. Generally, the cost is high, and the smelting and casting technology is relatively backward. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a low-cost, industrialized production of high-nitrogen non-magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C22C38/58C22C38/02C22C38/44
CPCC22C33/06C22C38/001C22C38/02C22C38/44C22C38/58
Inventor 李玉标郭海军张凯亮黄开元李占华双伟鹏翟文进艾俊林姚伟胡建成金会业
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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