Check patentability & draft patents in minutes with Patsnap Eureka AI!

A supersaturated high nitrogen stainless steel pressurized slag remelting process

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

Active Publication Date: 2022-07-08
DEQING TIANMA BEARING CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A supersaturated high nitrogen stainless steel pressurized slag remelting process
  • A supersaturated high nitrogen stainless steel pressurized slag remelting process
  • A supersaturated high nitrogen stainless steel pressurized slag remelting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment provides a supersaturated high nitrogen stainless steel pressurized slag remelting process, the supersaturated high nitrogen stainless steel is 30Cr15MoN steel, and its chemical composition requirements are (in mass percentage): C 0.28~0.34%, Si 0.30~0.80%, Mn 0.30~0.60%, P≤0.020%, S≤0.010%, Cr14.50~16.00%, Mo 0.95~1.10%, Cu≤0.25%, N0.35~0.44%, Ni≤0.30% , Al≤0.035%, Ti≤0.0030%, the described pressurized electroslag remelting process specifically includes the following steps:

[0047] S1. Preliminary preparations: Thoroughly remove the iron oxide scale on the surface of the electrode rods; make consumable electrodes and dummy plates by welding; lay slag on the dummy plates, electroslag remelting is started by solid slag, and the slag system is pre- Slag, the composition of which, by mass percentage, includes: 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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
hardnessaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of metal metallurgy, and specifically discloses a supersaturated high-nitrogen stainless steel pressurized electroslag remelting process, which includes preliminary preparation, vacuum extraction and pressurized air, primary electroslag remelting, slow cooling finishing, and secondary electroslag remelting. Electroslag remelting, finished product finishing and inspection and acceptance marking steps. The invention ensures that the nitrogen content reaches the target range by controlling the remelting pressure of the pressurized slag at 10-20 bar and the pressure setting value is greater than the theoretical value, and using nitrogen as the inert gas for charging; by optimizing the addition method of the nitrided alloy And adopt secondary pressure electroslag remelting, and control the secondary remelting pressure not less than primary remelting, reduce the segregation of nitrogen elements, and ensure the uniformity of the structure of the steel ingot; by optimizing the control mode and process parameters of the thermal capping process, improve the material consistency. density. The performance of the stainless steel product prepared by the invention reaches the international advanced level, and can fill the blank of the domestic industrial production of supersaturated high nitrogen martensitic stainless steel.

Description

technical field [0001] The invention belongs to the technical field of metal metallurgy, and in particular relates to a supersaturated high nitrogen stainless steel pressurized electroslag remelting process. Background technique [0002] Supersaturated high nitrogen stainless steel is a steel 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 with excellent toughness (impact toughness up to 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 ℃), hardness up to 60 Rockwell hardness, is used for Spindle and ball bearings in aerospace and aeronautics as well as general machine building. Due to the relatively la...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com