Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Smelting method of 18CrNiMo7-6 steel

A smelting method and a combined technology, applied in the field of metallurgical steelmaking, can solve the problems of low oxygen and high purity control

Pending Publication Date: 2021-03-16
SHANXI TAIGANG STAINLESS STEEL CO LTD
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention aims to solve the problem of low oxygen and high purity control of high-speed iron gear steel 18CrNiMo7-6 produced by electroslag smelting process

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0006] A method for smelting 18CrNiMo7-6 steel, comprising the following contents:

[0007] Use VD to smelt and forge electrodes, electrode blank surface treatment: peel or polish the surface of cast electrodes.

[0008] Electroslag remelting adopts remelting under the protection of argon gas. In order to limit the increase of Al, no Al powder is added for deoxidation. Electroslag remelting: the ratio of slag system is: CaF 2 : 60%, Al 2 o 3 : 20%, CaO: 20%, impurity element content FeO≤0.2%, SiO 2 ≤0.5%. Remelting under the protection of argon, the flow rate of argon is 10-15 L / min.

[0009] Specific process steps:

[0010] 1) Loading: Weld the gear steel electrode to be smelted with the dummy electrode and connect it with the electrode holder. At the bottom of the crystallizer, place the same material as the arc strike ring, turning chips and 8-10% slag of the total slag.

[0011] 2) Purge with inert gas: close the protective cover, pass in Ar gas to purge the bottom...

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

No PUM Login to View More

Abstract

The invention discloses a smelting method of 18CrNiMo7-6 high-speed rail gear steel. The smelting method is characterized in that a slag system comprises the following components in ratio: 60% of CaF2, 20% of Al2O3, 20% of CaO, less than or equal to 0.2% of impurity element FeO and less than or equal to 0.5% of SiO2. The diameter of an electroslag remelting crystallizer is 350 mm, the filling ratio is 0.7-0.75, and the melting rate (kg / h) is equal to (0.8-0.85)*the diameter of the crystallizer. According to the 18CrNiMo7-6 steel produced through the method, the surface of a steel ingot is freeof slag grooves and other defects, and the head, tail and cross section deviation of C, Mn, Cr and other elements in the steel ingot after remelting is less than or equal to 0.005%. The [O] content of a smelted product reaches 12-17 ppm, and the grades of A, B, C and D inclusions in steel are all smaller than or equal to 0.5.

Description

technical field [0001] The invention belongs to the field of metallurgical steelmaking, and in particular relates to a method for smelting 18CrNiMo7-6 steel. Background technique [0002] 18CrNiMo7-6 steel is a high-speed iron gear steel. Oxygen and oxide inclusions in the steel will reduce the mechanical properties of the steel and deteriorate the process performance of the steel, thus affecting the service life of the gear. Therefore, as the speed of the high-speed iron increases, the control of oxygen Getting stricter. At present, the production process of gear steel 18CrNiMo7-6 at home and abroad is electric furnace smelting-LF furnace refining-VD vacuum-steel ingot casting. The crystalline structure of mold injection or continuous casting is worse than that of electroslag smelting steel ingots, which affects the performance of the final product. As the speed of high-speed rail increases, higher purity of steel and denser crystalline structure of ingots are required. T...

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
IPC IPC(8): C22B9/18C22C38/44C22C38/04
CPCC22B9/18C22C38/44C22C38/04
Inventor 赵鸿燕王伟李克明
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com