External refining method for refining high-carbon chromium bearing steel inclusion particles

A technology of refining high-carbon chromium bearings and refining outside the furnace, which is used in the production of ultra-high-quality bearing steel, can solve problems such as large brittle inclusion particles, and achieve the effect of preventing molten steel from oxidizing

Inactive Publication Date: 2019-05-21
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
View PDF9 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the continuous casting steel or die casting steel produced by the high-efficiency refining meth

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
  • External refining method for refining high-carbon chromium bearing steel inclusion particles
  • External refining method for refining high-carbon chromium bearing steel inclusion particles
  • External refining method for refining high-carbon chromium bearing steel inclusion particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] Below in conjunction with embodiment the present invention is described in further detail.

[0027] According to the chemical composition range designed for high-carbon chromium bearing steel, see Table 1, after 100 tons of converter BOF → slag removal RS → 100 tons of refining furnace LF → 100 tons of vacuum degassing furnace RH → large section continuous casting machine CC → rolling Produced 10 stoves, the steel of the present invention of 8 specifications.

[0028] (1) The ladle, continuous casting tundish and molten steel are made of high refractoriness materials with magnesium content (≥90%), aluminum alloy is used as a deoxidizer, and special slag is used: containing 40-60% CaO, 3-10 %MgO, 3~10%SiO 2 , 20-40% Al 2 o 3 special refining slag, and control the free CaO mole fraction in the refining slag to 40% to 60%;

[0029] (2) The molten iron is decarburized by blowing oxygen through the converter BOF, and the carbon content at the end point is controlled to 0...

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 relates to an external refining method for refining high-carbon chromium bearing steel inclusion particles. The method comprises the procedures of material control, BOF, RS, LF, RH, CC and rolling, BOF blowing oxygen decarbonization is further controlled, and the final carbon content ranges from 0.15% to 0.80%. More than 0.5 kg/t aluminum is added to molten steel during steel tappingaccording to an aluminum oxygen equilibrium diagram, so that the oxygen content in the steel after steel tapping is reduced to 30 ppm or below, and the steel tapping temperature is controlled to range from 1600 DEG C to 1700 DEG C. RS drossing operation is carried out after BOF converter smelting steel tapping, and slag in a steel ladle is removed. Refining slag is added during LF refining, the molar fraction of CaO in the refining slag is controlled to range from 40% to 60%, the aluminum content in the steel is controlled to range from 0.03% to 0.07%, and the oxygen content during steel tapping is controlled to be below 10 ppm, and the steel tapping temperature ranges from 1550 DEG C to 1610 DEG C. Argon stirring is carried out in the whole RH vacuum degassing process, and the vacuum state below 100 Pa is kept for 10 min or longer. A continuous casting process which is high in efficiency and low in cost and saves energy is adopted, the production process is perfected, the critical process is optimized, and the particles of fragile DS inclusion of the product are finer.

Description

technical field [0001] The invention belongs to the technical field of production of ultra-high-quality bearing steel, and in particular relates to an out-of-furnace refining production method of high-carbon chromium bearing steel. Background technique [0002] With the rapid development of the national economy, the application of bearings in our country continues to expand, and the existing key bearings for automobiles and railways generally increase the life and reliability requirements. Bearing life is required to travel more than 2.4 million kilometers. In this regard, the research on the relationship between steel quality and bearing life has achieved remarkable results, and the purity of steel is the primary factor affecting the life of bearing steel. [0003] It has been more than 40 years in my country to produce high-carbon chromium bearing steel by refining outside the furnace. With the improvement of equipment and technology level, the purity of steel has made gr...

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): C21C7/06C21C7/068C21C7/10
Inventor 耿克许晓红钱刚白云李锋陈德尹青
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap