A kind of preparation method of sleeper spring bar

A technology for spring bars and sleepers, which is applied in the field of metal functional material preparation, can solve the problems of increased maintenance cost, short service cycle, environmental pollution, etc., and achieves the effects of long fatigue life, cost saving, and environmental pollution reduction.

Active Publication Date: 2020-07-31
SOUTHWEST JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual production process, oil cooling is used for quenching. When tempering, the oil on the surface of the spring will burn and produce a lot of oily smoke, which will pollute the environment.
Before surface anti-corrosion treatment, surface cleaning and activation treatment are required, which will generate waste liquid, etc., and will also pollute the environment
At present, the main anti-corrosion method of sleeper elastic is powder zinc-nickel alloy + coating composite treatment. Powder metal infiltration not only has high cost, but also produces dust pollution.
In addition, according to the fatigue test standard TB / T2329-2002 for railway sleeper spring bars, the fatigue life of the spring bars should not be less than 5 million times, and the service life generally needs to be replaced within 5-8 years. The short service life greatly increases maintenance cost

Method used

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  • A kind of preparation method of sleeper spring bar
  • A kind of preparation method of sleeper spring bar
  • A kind of preparation method of sleeper spring bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing a sleeper spring bar. The sleeper spring bar is made of a spring steel billet containing vanadium, and the mass percentages of the spring steel billet are as follows: carbon C: 0.56%; silicon Si: 1.80%; manganese Mn: 0.80 %; Vanadium V: 0.15%; Copper Cu: 0.05%; Aluminum Al: 0.08%; Sulfur S: 0.011%; Phosphorus P: 0.012%; Iron Fe: 96.537%; The induction vacuum electric furnace is smelted by gas protection electroslag, and then hot forged and hot rolled to make spring steel billets. The hot rolled spring steel billets need to remove the surface decarburization layer and scale, and the austenite grain size is 7 grades; The spring steel billet is used as the raw material, and the sleeper clip is drawn and formed after intermediate frequency induction heating. The formed sleeper clip is quenched by gas atomization. The quenching medium is water and air. The quenched sleeper clip is placed into the gas co-infiltration furnace for surface treatment; under...

Embodiment 2

[0030] A method for preparing a sleeper clip, the spring steel used in the clip has the following mass percentages of the main components: carbon C: 0.58%; silicon Si: 2.0%; manganese Mn: 1.0%; vanadium V: 0.18%; copper Cu: 0.0%; aluminum Al: 0.06%; sulfur S: 0.010%; phosphorus P: 0.010%; Hot forging and hot rolling are made into spring steel billets. The spring steel billets after hot rolling need to remove the surface decarburization layer and scale, and the austenite grain size is 7 grades. Among them, the impurity element oxygen content O: 10ppm; nitrogen content For N: 12ppm. The spring billet is used as the raw material, heated to a temperature of 930±10°C by medium-frequency induction heating, and then shaped into type I-A spring bars. After forming, the temperature is 840±5°C, and then gas atomized quenching is carried out. The hardness is HRC58. Under the condition of 480°C, tempering and gas co-infiltration treatment are carried out on the quenched elastic bar at th...

Embodiment 3

[0032]A method for preparing a sleeper clip, the spring steel used in the clip has the following mass percentages of the main components: carbon C: 0.60%; silicon Si: 2.0%; manganese Mn: 1.2%; vanadium V: 0.20%; copper Cu: 0.06%; aluminum Al: 0.0%; sulfur S: 0.010%; phosphorus P: 0.010%; Hot forging and hot rolling are made into spring steel billets. The spring steel billets after hot rolling need to remove the surface decarburization layer and scale, and the austenite grain size is 7 grades. Among them, the impurity element oxygen content O: 10ppm; nitrogen content For N: 14ppm. The spring billet is used as the raw material, heated to a temperature of 930±10°C by medium-frequency induction heating, and then shaped into type I-A spring bars. After forming, the temperature is 840±5°C, and then gas atomized quenching is carried out. The hardness is HRC60. Under the condition of 500°C, tempering and gas co-infiltration treatment are carried out on the quenched elastic bar at the...

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Abstract

The invention discloses a method for preparing a sleeper spring bar, and relates to the technical field of metal functional material preparation. The mass percentage of sleeper elastic components is: carbon C: 0.56-0.60%; silicon Si: 1.8-2.0%; manganese Mn: 0.80-1.2%; vanadium V: 0.15-0.2%; copper Cu: <0.10%; Aluminum Al: <0.1%; Sulfur S: <0.015%; Phosphorus P: <0.015%; the balance is iron Fe, the oxygen content of impurity elements is O<12ppm; the nitrogen content is N<15ppm; The slag is smelted, then hot forged and hot rolled to make spring steel billets. The spring steel billet is used as the raw material, and the sleeper spring bar is formed after intermediate frequency induction heating, put into the gas co-infiltration furnace, and the gas nitrogen N, carbon C, oxygen O co-infiltration treatment is carried out under the condition of 480-520 °C. A 3-5 micron thick compound layer and a 0.1-0.2 mm thick co-infiltration layer are obtained on the surface; zinc-aluminum coating treatment is performed on the sleeper springs after gas co-infiltration, and baked at 300-350°C after coating Dry for 0.5-1 hour, and control the coating thickness at 3-5 microns.

Description

technical field [0001] The invention relates to the technical field of preparation of metal functional materials. Background technique [0002] The railway sleeper spring is an important part of the railway fastener system, which is used to buckle on the rail and play the role of fixing the rail and reducing vibration and noise during the operation of the train. Sleeper clips are generally made of spring steel. After hot forming, quenching, medium temperature tempering and surface anti-corrosion are sequentially performed. Not only high fatigue resistance is required, but also excellent environmental corrosion resistance is required. However, in the actual production process, oil cooling is used for quenching. When tempering, the oil on the surface of the clip will burn and produce a lot of oily smoke, which will pollute the environment. Before surface anticorrosion treatment, surface cleaning and activation treatment are also required, which will generate waste liquid, etc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/16C22C38/06C23C8/28C21D1/18B05D7/14
Inventor 崔国栋郭华刘艳张程菘陈辉杨川
Owner SOUTHWEST JIAOTONG UNIV
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