Steel rail and production method of steel rail

A production method and rail technology, applied in the field of metallurgy, can solve the problems of pearlitic rail wear, increased peeling, unsatisfactory, etc., and achieve good promotion value, high production efficiency, good wear resistance and contact fatigue resistance.

Active Publication Date: 2018-12-18
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the active steel rails in my country are pearlitic. With the increase of the load and speed of my country's railway freight, the existing pearlitic rails used in the curve sections of railway lines and turnouts with harsh conditions such as wear and peeling have a large number of failures. increase, the performance of the existing pearlitic rails is far from meeting the development needs of high-speed and heavy-duty railway transportation, and it is urgent to improve the comprehensive performance of the rails

Method used

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  • Steel rail and production method of steel rail
  • Steel rail and production method of steel rail
  • Steel rail and production method of steel rail

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the steel rail of the embodiment of the present invention, its chemical composition is: C 0.16-0.25, Si 0.70-1.20, Mn 1.60-2.45, P≤0.022, S≤0.015, Al≤0.030, Cr+Ni+ Mo≤2.30, RE 0.0005-0.0020, the balance is matrix Fe and undetectable trace impurity elements.

[0021] Mn, Cr elements depress bainite transformation point, improve bainite hardenability and strength, Ni element stabilizes austenite, refines bainite structure, improves impact toughness, Mo stabilizes bainite transformation and strengthens bainite Structure, RE elements mainly strengthen grain boundaries, refine grains, effectively modify inclusions, and increase elongation.

Embodiment 2

[0023] The production method of the steel rail according to the embodiment of the present invention includes: pretreatment of molten iron; smelting in a 90-ton top-bottom combined blowing converter; refining in an LF furnace; VD vacuum treatment; continuous casting of blooms; heating in a walking heating furnace; Phosphorus; BD1 blanking; BD2 medium rolling; high pressure water phosphorus removal; CCS universal rolling; straightening; cooling; flaw detection; sawing.

[0024] Further, the raw materials are (wt%) 90% blast furnace hot metal and 10% scrap steel, and the blast furnace hot metal is pretreated by KR desulfurization, so that the S content in the molten iron is ≤0.005%, and the P content is ≤0.110%.

[0025] Further, the molten iron and steel scrap after the pretreatment of the molten iron are blended into the top-bottom combined blowing converter according to a certain proportion, and are smelted by the double slag-leaving slag process, and the end point temperature ...

specific Embodiment approach

[0032] A smelting production process for rare earth-containing high-strength and high-toughness rails, including: molten iron pretreatment → 90-ton top-bottom double-blowing converter smelting → LF furnace refining → VD vacuum treatment → bloom continuous casting. Corresponding technological measures shall be taken during molten iron pretreatment, converter smelting, LF, VD external refining, and continuous casting, including: blast furnace molten iron undergoes KR desulfurization pretreatment, so that the S content in molten iron is ≤0.005%, and the P content is ≤0.110%; Then the pretreated molten iron and high-quality steel scrap are mixed into the top-bottom double-blowing converter according to the proportion, and the double slag-leaving slag process is used for smelting. Low aluminum silicon calcium barium is used for deoxidation, the addition amount is 2.6kg / ton of steel, and the slag stopper is used to stop the slag, and 3kg / ton of top slag lime is added after tapping; ...

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Abstract

The invention provides a steel rail and a production method of the steel rail. The steel rail is prepared from chemical components in percent by weight: 0.16-0.25% of C, 0.70-1.20% of Si, 1.60-2.45% of Mn, smaller than or equal to 0.022% of P, smaller than or equal to 0.015% of S, smaller than or equal to 0.030% of Al, smaller than or equal to 2.30% of Cr+Ni+Mo, 0.0005-0.0020% of RE and the balance being a matrix Fe and microimpurity elements incapable of being detected. By means of the technical scheme, rolled steel made from Cr, Ni and Mo high-alloy low-carbon steel and containing Re has good strength, toughness and mechanical performance, and the steel rail prepared from the rolled steel has good abrasion resistance and contact fatigue resistance. The rare-earth-containing high-strengthhigh-toughness bainite steel rail has a special production process, is high in production efficiency, low in cost and suitable for large-scale production, and has good economic benefits and good promotional value, and energy saving and environmental protection are achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a steel rail and a production method for the steel rail. Background technique [0002] The rapid development of railways towards heavy-duty and high-efficiency technology puts forward higher and higher requirements for the performance and life of steel rails. At present, most of the active steel rails in my country are pearlitic. With the increase of the load and speed of my country's railway freight, the existing pearlitic rails used in the curve sections of railway lines and turnouts with harsh conditions such as wear and peeling have a large number of failures. Increase, the performance of the existing pearlitic rails is far from meeting the development needs of high-speed and heavy-duty railway transportation, and it is urgent to improve the comprehensive performance of the rails. Contents of the invention [0003] The present invention aims to solve at least one of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/58C22C38/44C22C33/04E01B5/02
CPCC22C33/04C22C38/005C22C38/02C22C38/44C22C38/58E01B5/02
Inventor 孟保仓何建中梁正伟宋海张怀军刘岩军杨维宇陈建新张达先
Owner BAOTOU IRON & STEEL GRP
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