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Heat treatment production method of steel rail for mixed passenger and freight traffic railway and obtained steel rail

A technology of mixed transportation of passengers and cargo, rails, applied in heat treatment furnaces, heat treatment equipment, rails, etc., can solve problems such as difficult to effectively meet the user's rail production requirements

Active Publication Date: 2016-11-09
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

Therefore, the existing methods are difficult to effectively meet the production requirements of the user's rails, and there is an urgent need for a heat treatment method for medium-strength rails.

Method used

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  • Heat treatment production method of steel rail for mixed passenger and freight traffic railway and obtained steel rail
  • Heat treatment production method of steel rail for mixed passenger and freight traffic railway and obtained steel rail
  • Heat treatment production method of steel rail for mixed passenger and freight traffic railway and obtained steel rail

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Molten steel smelting: Smelting is carried out with low-S furnace molten iron with an S content of about 0.008% by weight. During the smelting process, refining slag composed of aluminum oxide, barium oxide and calcium fluoride (wherein the percentage content is w(Al 2 o 3 )=23% by weight, w(BaO)=10% by weight, w(CaF 2)=5% by weight) and a recarburizing agent composed of anthracite and low N alloy, use a foaming agent in the heating process of the LF furnace, and control the composition content to finally obtain the molten steel of the chemical composition shown in 1# in Table 1.

[0033] (2) The molten steel obtained in step (1) is fully protected and cast into a steel billet, and then sent to the slow cooling pit for slow cooling at a rate of 0.3°C / min, and the steel billet cooled to room temperature is sent into a heating furnace for heating and heat preservation ( The heating rate is 10°C / min, the termination temperature (tapping temperature) is 950°C, and the...

Embodiment 2-6

[0036] According to the method of Example 1, the difference is that the chemical composition of the molten steel obtained by smelting is as shown in Table 1 and Table 2, and the specific operating parameters of the method are as shown in Table 1.

[0037] Table 1

[0038]

[0039] Table 2

[0040]

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PUM

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Abstract

The invention relates to the field of steel making, in particular to a heat treatment production method of a steel rail for a mixed passenger and freight traffic railway and the steel rail obtained by the method. The method includes the steps that the railhead tread center, the two sides of a railhead and the rail base center of the steel rail obtained after rolling are sequentially subjected to accelerated cooling, slow cooling and air cooling; the starting cooling temperature of accelerated cooling is 650-950 DEG C, the cooling speed is 2.5-7 DEG C / s, and the final cooling temperature is 400-600 DEG C; the cooling speed of slow cooling is 0.1-1.5 DEG C / s, and the final cooling temperature is 180-300 DEG C. The steel rail comprises, by weight, 0.71%-0.82% of C, 0.13%-0.60% of Si, 0.65%-1.25% of Mn, 0.05%-0.25% of Cr, 0-0.1% of Al, 0-0.025% of P, 0-0.025% of S and 97.01%-98.46% of Fe. By the adoption of the method, hardness of the steel rail can be controlled within the appropriate range of 350-380 suitable for the mixed passenger and freight traffic railway under the premise of guaranteeing the tensile property of the steel rail.

Description

technical field [0001] The invention relates to the field of steel making, in particular to a heat treatment production method for steel rails used in passenger-freight mixed railways, and the steel rails obtained by the method. Background technique [0002] With the rapid development of the world's railway transportation, some lines at home and abroad require mixed railways for high-speed passenger transportation and heavy-haul freight, which has become an economical and efficient transportation mode. Pansteel communicated with a country in Southeast Asia and learned that the other party needs tens of thousands of tons of medium-high strength high-speed mixed passenger and freight rails with a hardness of more than 350HB. Under the premise of satisfying the other party's performance indicators, Panzhihua Iron and Steel has made the key technical indicators how to design the composition and supplement it with heat treatment. Therefore, the existing methods are difficult to ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/06C21D9/04C21D8/00E01B5/02
CPCC21D8/005C21D9/04C21D2221/10C22C38/02C22C38/04C22C38/06C22C38/18E01B5/02
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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