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Supersaturated high-nitrogen stainless steel pressurized electroslag remelting process

A technology of high-nitrogen stainless steel and pressurized electroslag, which is applied in the field of metallurgy, can solve problems such as poor density, and achieve the effects of good structure uniformity, high hardness, and excellent mechanical properties

Active Publication Date: 2021-02-12
DEQING TIANMA BEARING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a supersaturated high-nitrogen stainless steel pressurized electroslag remelting process, which can ensure that the nitrogen content reaches the target range, and can also solve the problems of poor material structure uniformity and density, and improve the quality of finished products

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  • Supersaturated high-nitrogen stainless steel pressurized electroslag remelting process

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Embodiment 1

[0046] This embodiment provides a pressurized electroslag remelting process for supersaturated high-nitrogen stainless steel. The supersaturated high-nitrogen stainless steel is 30Cr15MoN steel, and its chemical composition requirements are (by mass percentage): C 0.28~0.34%, Si 0.30~0.80%, Mn0.30~0.60%, P≤0.020%, S≤0.010%, Cr14.50~16.00%, Mo 0.95~1.10%, Cu≤0.25%, N 0.35~0.44%, Ni≤0.30% , Al≤0.035%, Ti≤0.0030%, the described pressurized electroslag remelting process specifically includes the following steps:

[0047] S1. Preliminary preparation: Thoroughly remove the oxide scale on the surface of the electrode rod; weld the consumable electrode and the dummy plate; lay the slag material on the dummy plate. Slag, the composition of which includes by mass percentage: CaF 2 43.22%, Al 2 o 3 0.32%, CaO 22.05%, SiO 2 21.48%, MgO 12.25%; assemble the crystallizer, the nominal capacity of the crystallizer used is 8t, and the average diameter of the crystallizer is Φ656mm;

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Abstract

The invention belongs to the technical field of metal metallurgy, and particularly discloses a supersaturated high-nitrogen stainless steel pressurized electroslag remelting process which comprises the steps of early-stage preparation, vacuumizing and pressurizing, primary electroslag remelting, slow cooling finishing, secondary electroslag remelting, finished product finishing and inspection, acceptance and labeling. According to the supersaturated high-nitrogen stainless steel pressurized electroslag remelting process, the pressurized electroslag remelting pressure is controlled to be 10 bar-20 bar, the pressure set value is larger than the theoretical value, nitrogen is used as inert gas for pressurizing, and it is ensured that the nitrogen content reaches the target range; by optimizing the adding mode of a nitriding alloy, adopting secondary pressure electroslag remelting and controlling the secondary remelting pressure to be not smaller than that of primary remelting, segregationof nitrogen elements is reduced, and the structure uniformity of steel ingots is ensured; and by optimizing the control mode and technological parameters of the heat capping process, the density of materials is improved. According to the supersaturated high-nitrogen stainless steel pressurization electroslag remelting process, the performance of a prepared stainless steel product reaches the international advanced level, and the blank of domestic supersaturated high-nitrogen martensitic stainless steel industrial production can be filled up.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a pressurized electroslag remelting process for supersaturated high-nitrogen stainless steel. Background technique [0002] Supersaturated high-nitrogen stainless steel is a steel type with a nitrogen content of more than 0.3%. It has excellent performance and has been widely used in machinery manufacturing, aerospace, chemical engineering, biotechnology and other fields. For example, 30Cr15MoN steel is a high-nitrogen martensite Cold-treated steel, which has outstanding toughness (impact toughness can reach 150j / cm at Rockwell hardness 56-57 2 , 3 times that of 1.4125 austenitic stainless steel), high corrosion resistance (3 times that of 1.4125 austenitic stainless steel), high annealing resistance (up to 50 ° C), hardness up to 60 Rockwell hardness, used for Spindle bearings and ball bearings in aerospace and aviation as well as general machine building. Due t...

Claims

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Application Information

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IPC IPC(8): C22B9/18C22C33/04C22C38/00C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/28C22C38/42C22C38/44C22C38/50
CPCC22B9/18C22C33/04C22C38/02C22C38/04C22C38/22C22C38/20C22C38/001C22C38/44C22C38/42C22C38/06C22C38/28C22C38/50Y02P10/20
Inventor 耿金鹏赵有为
Owner DEQING TIANMA BEARING CO LTD
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