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

Preparation method of rail steel

A technology for rail steel and molten steel, which is applied in the field of rail steel and the preparation of the rail steel, can solve the problem that the rail just cannot meet the quality requirements, and achieves the effects of facilitating production organization, improving the cleanliness of molten steel, and continuous and stable production.

Inactive Publication Date: 2012-06-06
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect that the steel rail prepared by the existing method just can not reach the quality requirements of the rail steel for high-speed railways above 350 km / h, and provide a high-speed railway that can reach more than 350 km / h. Rail steel for quality requirements of rail steel and method for preparing the rail steel

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

[0033] This example is used to illustrate the preparation of the rail steel provided by the present invention.

[0034] (1) Converter smelting

[0035] During converter smelting, add 140 tons of molten iron with a [C] content > 3.9% by weight in the converter for blowing, the blowing time is 15 minutes, and the blowing end point is that the [C] content of the molten steel is 0.1% by weight;

[0036] (2) Refining outside the furnace

[0037] In the converter tapping process, 2.5 kilograms of silicon-calcium-barium is added per ton of molten steel (Al content2 ) is 2.2, Al 2 o 3 is 10.2% by weight, and the Al content in molten steel is 0.002% by weight;

[0038] When the ladle containing molten steel is transported to the LF furnace, the bottom blowing argon is turned on, and 5 kg / ton of steel slag is added to the ladle again. After the slag is added, the LF starts refining treatment (heating rate is 3-5 ℃ / Minutes, blowing argon throughout the heating and refining process, ...

Embodiment 2

[0044] This example is used to illustrate the preparation of the rail steel provided by the present invention.

[0045] (1) Converter smelting

[0046] During converter smelting, 140 tons of molten iron with a [C] content > 3.9% by weight are added to the converter for blowing, the blowing time is 16 minutes, and the [C] content of the molten steel at the end of blowing is 0.09% by weight;

[0047] (2) Refining outside the furnace

[0048]In the converter tapping process, 3.0 kilograms of silicon-calcium-barium is added per ton of molten steel (Al content2 ) is 2.4, Al 2 o 3 The Al content is 9.2% by weight, and the Al content in molten steel is 0.003% by weight;

[0049] When the ladle containing molten steel is transported to the LF furnace, the bottom blowing argon is connected, and the slag material of 6 kg / ton of steel is added to the ladle again in the amount of molten steel per ton. After adding the slag material, the LF starts refining treatment (heating The rate i...

Embodiment 3

[0055] This example is used to illustrate the preparation of the rail steel provided by the present invention.

[0056] (1) Converter smelting

[0057] During converter smelting, add 140 tons of molten iron with a [C] content > 3.9% by weight in the converter for blowing, the blowing time is 15 minutes, and the [C] content at the end of blowing is 0.12% by weight;

[0058] (2) Refining outside the furnace

[0059] Add 2.0 kilograms of silicon-calcium-barium (Al content2 ) is 2.7, Al 2 o 3 The Al content is 8.2% by weight, and the Al content in molten steel is 0.002% by weight;

[0060] When the ladle containing molten steel is transported to the LF furnace, turn on the bottom blowing argon, and add 8 kg / ton of steel slag in the amount of molten steel per ton to the ladle again. After adding the slag, the LF starts refining treatment (heating The rate is 3-5°C / min, argon is blown throughout the heating and refining process, the molten steel is heated with an LF furnace to a...

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 a rail steel and a preparation method thereof. The rail steel contains the following components by taking the total weight of the rail steel as reference 0.65-0.75wt% of C, 0.80-1.30wt% of Mn, 0.10-0.50wt% of Si, less than or equal to 0.03wt% of V, less than or equal to 0.025wt% of P, 0.008-0.025wt% of S, less than or equal to 0.004wt% of Al, the balance of iron. Cleanliness of the rail steel is indicated by the grade of T(O) content, (H) content and contents of nonmetallic inclusions A, B, C and D, wherein total oxygen content T(O) in the rail steel is less than or equal to 0.0020wt%, (H) content is less than or equal to 0.0002wt%, and according to inclusion rating standard GB / T10561-2005, the inclusion A in the rail steel is less than or equal to 1.5 grade, the inclusion B is less than or equal to 1.0 grade, inclusion C is less than or equal to 1.0 grade, and the inclusion D is less than or equal to 1.0 grade. The rail steel for high speed railway provided by the invention has low inclusion content, low (H) content and low T(O) content, and the aim of effectively improving cleanliness of molten steel of rail steel is realized.

Description

technical field [0001] The invention relates to a rail steel and a preparation method of the rail steel. Background technique [0002] With the advancement of high-speed railway transportation and the construction of an intercity high-speed railway network with a speed of 350 km / h, in order to ensure the safety and comfort of train operation, more stringent quality requirements have been put forward for rail steel used in high-speed railways. Requirements, generally require that T[O]≤20×10 in rail steel -6 、[H]≤1.5×10 -6 , [Al]s≤0.004%, and the content levels of the four types of inclusions of type A, type B, type C and type D are not greater than level 2.0, level 1.0, level 1.0 and level 1.0 respectively. However, the quality of the rail steel produced by the ordinary rail steel production method is difficult to meet the requirements of 350 km / h high-speed rail steel, and the product qualification rate is only about 40%, so it is difficult to realize mass production. The...

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): C22C38/12C22C38/06C22C38/04C22C33/04C21C7/06C21C7/10B22D11/18
Inventor 曾建华江南红陈永陈天明梅东生杨素波肖明富李桂军周伟程书文杨森祥李青春
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