Marine environment corrosion-resistant steel rail

A marine environment and rail technology, applied in the field of rail materials, can solve the problems of poor welding performance, thermal welding impact toughness, low rail strength, and increased copper brittleness, etc., and achieve the effect of good mechanical properties.

Active Publication Date: 2014-09-24
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

First of all, the Cr content is a strengthening element commonly used in rail steel at present. Increasing the Cr content not only significantly improves the strength and toughness, but also improves the corrosion resistance; adding 0.2% to 0.65% of Cu and adding 0.1% to 0.3% of Cu as required Ni can slightly improve the strength and hardness index of the rail without losing ductility and plasticity; for corrosion resistance, if the P content in steel is ≤0.025%, its contribution to the improvem

Method used

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  • Marine environment corrosion-resistant steel rail
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  • Marine environment corrosion-resistant steel rail

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The steel rail resistant to corrosion in the marine environment has a chemical composition of C: 0.71%, Si: 0.69%, Mn: 0.92%, Cr: 0.20%, V: 0.08, Cu: 0.38%, Ni: 0.20%, P: 0.030%, S: ≤ 0.015%, the balance is Fe and unavoidable impurities.

[0029] The molten steel containing the above components is smelted by converter or electric furnace, after refining outside the furnace, vacuum degassing treatment, continuous casting into blooms, then sent to the heating furnace for heating and insulation, using the pass method or universal method to roll into a unit weight of 50 ~ 75kg / m rail, using the residual heat of the rail, apply a cooling medium of 2.8℃ / s to the rail head tread and both sides of the rail head respectively. When the temperature of the rail head tread drops to 465℃, the accelerated cooling is stopped and air-cooled to room temperature.

[0030] The steel rail prepared by the above method is tested for microstructure, pearlite lamella spacing, normal temperature ten...

Embodiment 2～ Embodiment 6

[0041] The chemical composition of the steel in Example 1 and its heat treatment process parameters were changed, and Example 2 to Example 6 were performed.

[0042] Table 1 lists the chemical composition of the steel billets of Examples 1 to 6, Table 2 lists the heat treatment process control parameters (including accelerated cooling rate and final cooling temperature) of Examples 1 to 6, and Table 3 lists Example 1 ~6 performance test results (including microstructure, pearlite sheet spacing, tensile strength Rm, elongation A and corrosion rate).

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Abstract

The invention relates to a steel rail material, and in particular relates to a marine environment corrosion-resistant steel rail. The technical problem to be solved by the invention is to provide a marine environment corrosion-resistant steel rail. The marine environment corrosion-resistant steel rail is prepared by adopting a heat treatment method comprising the following steps: performing accelerated cooling on the steel rail which is subjected to hot rolling and is positioned in an austenitic phase area at a cooling speed of 2-5 DEG C/s; stopping accelerated cooling until the temperature of a rail head tread is reduced to be less than 480 DEG C, and air-cooling to room temperature to obtain a steel rail finished product, wherein a microscopic structure of the steel rail finished product is a pearlite consisting of lamellar ferrites and cementite alternately distributed among the lamellar ferrites; the separation distance among pearlite sheets is not more than 120nm; the tensile strength of the steel rail finished product is more than or equal to 1200MPa, and the elongation percentage of the steel rail finished product is more than or equal to 10%. The steel rail disclosed by the invention is capable of resisting marine environment corrosion, has a corrosion rate of less than 1/2 of that of carbon and ordinary microalloyed steel rails under equal conditions in a marine environment, and is suitable for application in heavy haul railways with high transportation capacity and high axle load in coastal regions.

Description

Technical field [0001] The invention relates to a steel rail material, in particular to a steel rail resistant to corrosion in the marine environment. Background technique [0002] As a structural member that guides the train and transfers the load to the track bed, the steel rail is directly related to the railway transportation efficiency and driving safety. As railways are exposed to the natural environment for a long time, railway steels must not only meet the requirements of various mechanical properties, but also have certain corrosion resistance. During the service process of steel rails, not only have to withstand various complex stress effects, but also face failure problems caused by long-term corrosion. The railways along the southeast coast of my country are dense, with high traffic density and high total passing weight. Due to long-term service in the marine environment, the rails are severely corroded. On the basis of ensuring the required mechanical properties, th...

Claims

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Application Information

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IPC IPC(8): C21D8/00C22C38/46
Inventor 韩振宇邹明郭华李大东贾济海邓勇王春建袁俊陈崇木
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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