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High-impact-toughness steel rail and production method thereof

A production method and high-impact technology, applied in furnace types, quenching agents, heat treatment furnaces, etc., can solve problems such as high impact toughness, and achieve good strength and toughness matching, rolling contact fatigue performance and good wear resistance.

Active Publication Date: 2015-04-01
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing methods are difficult to effectively meet the production requirements of steel rails, and a steel rail with high impact toughness is urgently needed

Method used

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  • High-impact-toughness steel rail and production method thereof
  • High-impact-toughness steel rail and production method thereof
  • High-impact-toughness steel rail and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The chemical composition of the rail is C: 0.72%, Si: 0.35%, Mn: 0.98%, V: 0.05%, Al: 0.04%, P: 0.011%, S: 0.006% by weight, the balance is Fe and unavoidable 的impurities.

[0034] Use low-sulfur molten iron into the furnace, smelt pearlitic rail steel through a converter or electric furnace, use high-basicity refining slag for full protection and pouring, use anthracite and low-nitrogen alloys as recarburizers, use foaming agents and RH during refining in LF furnaces Or, after VD vacuum treatment, continuous casting into a steel billet with a certain section size is sent to a heating furnace for heating. Generally, the tapping temperature in the heating furnace is 1000°C; the steel billet is dephosphorized by multiple points of high-pressure water and rolled by a universal rolling mill.

[0035] After the rolling is completed, the waste heat of the steel rail is used to spray accelerated cooling medium to the center of the rail head tread, the two sides of the rail head and...

Embodiment 2～ Embodiment 5

[0039] The chemical composition and heat treatment process parameters of the steel rail in Example 1 were changed, and Example 2 to Example 5 were performed. Table 1 lists the chemical composition of the steel rails of Examples 1 to 5, Table 2 lists the heat treatment process parameters of Examples 1 to 5 (including accelerated cooling opening temperature, cooling rate and final cooling temperature), and Table 3 lists The tensile properties and metallographic structure of Examples 1 to 5 are listed. Table 4 lists the impact properties of Examples 1 to 6 at room temperature.

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Abstract

The invention relates to a high-impact-toughness steel rail and a production method of the high-impact-toughness steel rail, and belongs to the field of steel rail material production technologies. The technical aim of providing the high-impact-toughness steel rail is achieved. The high-impact-toughness steel rail is a pearlite steel rail, the interlamellar spacing ranges from 0.05 micron to 0.09 micron, and normal temperature ballistic work ranges from 30 J to 35 J. The steel rail comprises the chemical components: 0.71-0.82 percent of C, 0.25-0.45 percent of Si, 0.75-1.05 percent of Mn, 0.03-0.15 percent of V, no more than 0.030 percent of P, no more than 0.035 percent of S, no more than 0.020 percent of Al and the balance Fe and unavoidable impurities. The rail head U-type impact toughness of the steel rail manufactured through the method can be more than 30 J, tensile strength is larger than 1.300 MPa, the steel rail has good strength and toughness matching, the rolling contact fatigue property and wear-resisting property in the use process are good, and the high-impact-toughness steel rail is suitable for being used as steel rails for railways in high and cold areas.

Description

Technical field [0001] The invention relates to a steel rail with high impact toughness and a production method thereof, and belongs to the field of steel rail material production technology. Background technique [0002] With the rapid development of railway transportation, a large-volume, high-axle load, and high-density railway transportation model has initially taken shape. In the increasingly harsh line conditions, the problem of railway rails and rail damage has become increasingly prominent. Steel rail is not only an important equipment to realize railway connection and crossing, but also a key link that affects line operation efficiency and driving safety. The rails bear the dynamic load transmitted by the train wheels during the course of the line. Under the action of long-term alternating stress, the tendency of the rails to fracture and damage increases. Especially at low temperatures, the rail material becomes brittle and brittle fracture is more likely to occur. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C33/04C21D8/00
CPCB22D11/04B22D11/1213C21D1/60C21D1/613C21D1/84C21D6/005C21D6/008C21D8/005C21D9/04C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C21D6/00C21D8/00
Inventor 袁俊邹明郭华李大东邓勇韩振宇汪渊陈崇木
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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