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Low-carbon martensitic stainless steel for valve box and smelting method thereof

A low-carbon martensite and smelting method technology, applied in the field of stainless steel smelting, can solve the problems of high production raw material cost, long smelting process, and inability to directly reduce, so as to avoid returning to refining to adjust carbon increase, avoid returning to refining to adjust, and reduce The effect of raw material costs

Inactive Publication Date: 2020-05-08
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

Smelting method 1 has C, high gas content, and inclusions cannot be effectively removed. C is generally between 0.03-0.07%, H content is above 3ppm, and N is above 200ppm, which seriously affects performance and high production costs; smelting method 2 exists The smelting process is long, and the cost of raw materials produced by scrap steel and alloy is high. After VOD, it cannot be directly reduced, and the C content is difficult to be effectively controlled after pouring steel back to refining and heating for degassing.
The above two methods cannot meet the quality and cost control requirements

Method used

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  • Low-carbon martensitic stainless steel for valve box and smelting method thereof

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Embodiment 1

[0022] Example 1: A low-carbon martensitic stainless steel for a valve box, its technological process is: batching-induction furnace melting material head, steel shavings-deoxidation reduction microalloying in refining furnace-slag removal-VOD vacuum oxygen blowing decarburization- Reduction under vacuum conditions - vacuum degassing - die casting steel - annealing or hot delivery.

[0023] Its composition is as follows: C≤0.05%, Si:0.20-0.50%, Mn:0.30-0.70%, P≤0.025%, S≤0.010%, Ni:3.00-5.00%, Cr:15.0-17.5%, Cu:3.00 -5.00%, Nb:0.15-0.45%, Al≤0.040%.

[0024] A method for smelting low-carbon martensitic stainless steel for valve boxes, using batching-induction furnace melting head, steel shavings-deoxidation reduction microalloying in refining furnace-slag removal-VOD vacuum blowing oxygen decarburization-reduction under vacuum conditions- The technological process of vacuum degassing-die casting and pouring steel; specifically includes the following steps:

[0025] Step SO1,...

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Abstract

The invention relates to low-carbon martensitic stainless steel for a valve box and a smelting method of the low-carbon martensitic stainless steel. The technological process comprising stub bar and steel scrap melting by an induction furnace, refining furnace deoxidation reduction microalloying, slagging, VOD vacuum oxygen blowing decarburization, reduction under the vacuum condition, vacuum degassing and die casting steel pouring are adopted, alloy use is saved to the maximum extent, molten steel is reduced directly under the vacuum condition after VOD is adopted, low-carbon and good deoxidized molten steel is obtained, meanwhile, the smelting technological process is simplified, and the station utilization efficiency is improved.

Description

technical field [0001] The invention relates to a low-carbon martensitic stainless steel for a valve box and a smelting method thereof, belonging to the field of stainless steel smelting. Background technique [0002] 0Cr17Ni4Cu4Nb is a low carbon martensitic precipitation hardening stainless steel. It has high strength, high hardness, good welding performance and corrosion resistance. It has been widely used in valve boxes, valves, shafts and chemical fiber industries, as well as high-strength parts with certain corrosion resistance requirements. At present, the steel smelting methods include (1) electric arc furnace smelting low-phosphorus and low-carbon molten steel, induction furnace melting ferrochromium, nickel, copper and other alloys, AOD decarburization blowing, reduction, tapping and pouring; (2) electric arc furnace smelting Low-phosphorus and low-carbon molten steel, melting ferrochrome alloy in induction furnace, fine-tuning alloy in refining furnace, VOD deca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C22C38/42C22C38/06C22C38/04C22C38/02C22C33/06
CPCC22C33/06C22C38/004C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48
Inventor 祁跃峰王怡群赵鹏宗健金会业罗道侨
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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