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

Smelting method capable of improving heavy rail steel cleanliness

A smelting method and cleanliness technology, applied in the smelting field of improving the cleanliness of heavy rail steel, can solve the problem of the difficulty of meeting the cleanliness of heavy rail steel, improve fatigue properties and mechanical properties, reduce wire feeding time, and improve cleanliness Effect

Inactive Publication Date: 2018-11-13
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the cleanliness of the existing domestic heavy rail steel is difficult to meet the requirements of high-speed railways P+S+O+N+H≤160ppm, and various ratings of inclusions≤1.0

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 1

[0061] Molten iron pretreatment: use molten iron as raw material, use carrier gas to mix 4kg / t molten iron active lime and 1kg / t molten iron passivated magnesium powder, use rotary desulfurization spray gun to spray into molten iron, the injection time is 15min, after desulfurization Obtain low sulfur molten iron, S content: 0.001%, P content: 0.075%.

[0062] Converter smelting: add molten iron after desulfurization into the converter, add 15kg / t molten iron active lime, 10kg / t molten iron quartz sand, 10kg / t molten iron high magnesium lime and 2kg / t molten iron steelmaking sludge balls, single slag At the same time, oxygen is supplied by oxygen lance for blowing. The blowing lance position of the oxygen lance is controlled at 1.5-2.5m, and the temperature of the blowing process is 1668°C. After the smelting is finished, the molten iron is initially smelted into molten steel with a P content of 0.0025%. After the converter smelting is completed, the steel is tapped. When the...

Embodiment 2

[0068] Molten iron pretreatment: use molten iron as raw material, use carrier gas to mix 6kg / t molten iron active lime and 3kg / t molten iron passivated magnesium powder, use rotary desulfurization spray gun to spray into molten iron, the injection time is 30min, after desulfurization Obtain low sulfur molten iron, S content: 0.001%, P content: 0.072%.

[0069] Converter smelting: Add molten iron after desulfurization into the converter, add 20kg / t molten iron active lime, 15kg / t molten iron quartz sand, 15kg / t molten iron high magnesium lime and 3kg / t molten iron steelmaking sludge ball, single slag At the same time, oxygen is supplied by oxygen lance for blowing. The blowing lance position of the oxygen lance is controlled at 1.5-2.5m, and the temperature of the blowing process is 1658°C. After the smelting is finished, the molten iron is initially smelted into molten steel with a P content of 0.0018%. After the converter smelting is completed, the steel is tapped. When the ...

Embodiment 3

[0075] Molten iron pretreatment: use molten iron as raw material, use carrier gas to mix 5kg / t molten iron active lime and 2kg / t molten iron passivated magnesium powder, use rotary desulfurization spray gun to spray into molten iron, the injection time is 20min, after desulfurization Obtain low-sulfur molten iron, S content: 0.0006%, P content: 0.074%.

[0076] Converter smelting: add molten iron after desulfurization into the converter, add 18kg / t molten iron active lime, 13kg / t molten iron quartz sand, 13kg / t molten iron high magnesium lime and 2.5kg / t molten iron steelmaking sludge balls, single The slag method is used for smelting, and the oxygen lance is used for blowing at the same time. The blowing lance position of the oxygen lance is controlled at 1.5-2.5m, and the temperature of the blowing process is 1658°C. After the smelting is finished, the molten iron is initially smelted into molten steel with a P content of 0.0022%. After the converter smelting is completed, ...

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 capable of improving heavy rail steel cleanliness, and belongs to the technical field of ferrous metallurgy. The problem that the cleanliness of existing heavy rail steel cannot meet the requirements of the high speed railway is solved. The smelting method comprises the following steps of molten iron pretreatment, converter smelting, LF refining, RH refining and continuous casting, wherein in the step of LF refining, iron calcium lines of 1-3m / t of molten steel are adopted for calcium treatment. According to the smelting method, through the steps, P inthe steel rail can be controlled to be 0-0.0060%, S in the steel rail can be controlled to be 0-0.0030%, O in the steel rail can be controlled to be 0-0.0010%, N in the steel rail can be controlled to be 0-0.0050%, H in the steel rail can be controlled to be 0-0.00015%, the sum of P, S, O, N and H is 0-160ppm, and the grade of all inclusions is 0-1.0. Through the smelting method, the cleanlinessof the heavy rail steel is remarkably improved, and the smelting method has a certain social benefit and is worthy of application and popularization.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a smelting method for improving the cleanliness of heavy rail steel. Background technique [0002] Heavy rail steel is the main component of railway tracks. During railway transportation, steel rails provide effective support and guidance for locomotives and must bear huge vertical pressure from wheels. Based on the development needs of my country's infrastructure construction, railway transportation is developing at a rapid speed, and it is becoming more and more high-speed and heavy-duty. This undoubtedly puts forward stricter requirements on the quality of the rails. [0003] When the rail is in contact with the wheel, it bears the reciprocating and variable load of the locomotive. Its cleanliness has an important impact on the life of the rail. The inclusions in the steel are the main reasons for the internal damage and fatigue damage of the hea...

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): C21C7/064C21C5/28C21C7/06C21C7/076C21C7/10
CPCC21C5/28C21C7/0006C21C7/0056C21C7/06C21C7/0645C21C7/076C21C7/10Y02P10/20
Inventor 陈天明陈亮李红光
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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