Preparation method of sleeper elastic strip

A technology for spring bars and sleepers, applied in the field of metal functional material preparation, can solve the problems of increased maintenance cost, short service cycle, dust pollution, etc., and achieve the effects of long fatigue life, cost saving, and hardness improvement

Active Publication Date: 2019-05-21
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

Method used

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  • Preparation method of sleeper elastic strip
  • Preparation method of sleeper elastic strip
  • Preparation method of sleeper elastic strip

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 preparation method of a sleeper elastic strip, and relates to the technical field of metal function material preparation. The sleeper elastic strip is prepared from the components in percentage by mass: 0.56 to 0.60 percent of carbon C, 1.8 to 2.0 percent of silicon Si, 0.80 to 1.2 percent of manganese Mn, 0.15 to 0.2 percent of vanadium V, less than 0.10 percent of copper Cu, less than 0.1 percent of aluminum Al, less than 0.015 percent of sulfur S, less than 0.015 percent of phosphorus P, and the balance ferrum Fe, wherein according to the impurity elements, the oxygen content O is less than 12ppm, and the nitrogen content N is less than 15ppm. The preparation method of the sleeper elastic strip comprises the steps of adopting an induction vacuum electric furnace for carrying out gas shield electro-slag melting, hot forging, and hot rolling to obtain a spring steel billet material; adopting the spring steel billet material as a raw material, carrying out medium frequency induction heating, molding the sleeper elastic strip, placing in a gas co-permeation furnace, carrying out gas nitrogen N, carbon C and oxygen O co-permeation treatment at the temperature of 480 to 520 DEG C, and obtaining a compound layer with the thickness being 3 to 5 micrometers and a co-permeation layer with the thickness being 0.1 to 0.2mm on the surface; carrying out zinc-aluminum coating treatment on the sleeper elastic strip subjected to gas co-permeation, drying for 0.5 to 1 hour at the temperature of 300 to 350 DEG C after coating, and controlling the thickness of thecoating to range from 3 micrometers to 5 micrometers.

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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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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