What material are train tracks made of?

The train rail is composed of steel and can be divided into ordinary manganese-containing rails, copper-containing carbon steel rails, high-silicon copper-containing steel rails, copper rails, manganese rails, silicon rails, etc.

Introduction to Train Rails:

1. It is used to lay railways, and it is necessary to withstand the pressure, impact load and friction during the operation of the train, and it is required to have sufficient strength and certain toughness.

2. Strict quality requirements, in addition to ensuring its chemical composition, it is also required to inspect mechanical properties, drop weight test and acid leaching low-power structure.

3. The production plants include Wuhan Iron and Steel, Anshan Iron and Steel, Baotou Iron and Steel and Pangang, etc.

4. The crane rail, that is, the crane rail, has a low height and a large size of head width and waist thickness. Only the chemical composition and tensile strength are required to be checked. It is used for laying crane and trolley tracks.

The content is as follows: the rails of the railway are composed of steel, which can be divided into ordinary manganese-containing rails, copper-containing carbon steel rails, high-silicon copper-containing steel rails, copper rails, manganese rails, silicon rails, etc

The specifications of the rails are: 43 kg m, 50 kg m, 60 kg m, 200 km of high-speed railway rails (75 kg m).

Technical condition indicators.

Chemical composition and residual elements: The chemical composition of the 200km h rail is U71MN, UIC900A, PD3 and BNBRE, and the 300km h rail adopts the European standard EN260, but its composition content is slightly adjusted compared with the composition of the original steel grade.

Hydrogen content: molten steel [h] ; In the finished rail [h].

Total oxygen content: [o] 20 10-6.

Stretching: Table 1.

Tread centerline hardness: Table 1.

Table 1: Mechanical properties of rails.

Steel Gauge Tensile Strength MPa Elongation % Rail Head Tread Centerline Hardness (HB).

u71mn,uic900a ≥880 ≥10 260~300

pd3,bnbre ≥980 ≥9 280~320

en260 ≥880 ≥10 260~300

Note: On the same rail, the hardness variation range is not more than 30HB.

Microstructure: The microstructure of the rail section should be pearlite (a small amount of ferrite is allowed) structure, and there should be no martensite, bainite and cementite distributed along the grain boundary.

Decarburization layer: The depth of the continuously closed ferrite mesh must not be exceeded.

Non-metallic inclusions: detected according to GB10561 standard.

Provisions for non-metallic inclusions.

Railroad tracks. The steel products include manganese steel, copper-containing carbon steel, high-silicon copper-containing steel, in addition to copper rails, manganese rails, silicon rails and so on. Railway tracks generally refer to railway tracks, which are mainly used on railways and work with switches to enable trains to walk without turning.

A railway track usually consists of two parallel rails that are fixed to a sleeper with ballast under the sleeper. The rails of this railway are made of high manganese steel.

Made-up. If 2-3% manganese is added to the steel, then the resulting low-manganese steel is as brittle as glass and will shatter when struck. But if you add 13% of manganese to make high-manganese steel, it will become hard and tough.

So people use manganese steel to make wear-resistant machine parts, rails, bridges, etc. Another metal was added to the upper part of the rails, the layer that came into contact with the wheels: indium.

The addition of indium makes the rails.

The upper part has a certain toughness while maintaining hardness, which is very important for the wheels of the train. When it collides with the "tire", it will have a certain elasticity, thus ensuring the safe operation of the train.

How are rails made? The rails are made from these cans.

And scrap just started.

Clause. First, use electromagnets first.

The scrap is sucked up and placed into this hopper, which is then poured into this electric arc furnace by a crane.

Electric arc furnaces utilize a powerful electric current at 1650 degrees Celsius.

The scrap is then poured into a brick-lined bucket and carbon, magnesium and other elements are added to strengthen the toughness of the steel. In order to avoid the destruction of the characteristics of the steel in contact with oxygen in the financial industry, these industries will pass through ceramic tubes, runners, molds, and then press it into a large billet in the shape of a square leg, and then use acetylene.

Poly cut the large billet into meters long. Then the crane will send the cut billet into the heating furnace to heat for five to seven hours, and setting the high temperature of 1260 degrees will make it soft and easy to form later.

Clause. Second, the heated billet will be sent into the roller press, he will raise each billet to four times the original length, and then the shearing machine will cut the long and thin billet into four pieces, the cut billet will be reheated, the heated billet can better speed the shape of the rail. In order to finalize the shape, each rail is rolled in three consecutive steps several times to ensure that the standard Hongshi T-profile is rolled out, and then the end of the rail is cut off by about 30 centimeters in the original sentence, and then the rails are placed to cool to 500 degrees Celsius, and then they are placed in the temporary village with an electromagnet and let stand for ten hours until the temperature cools to 88 degrees Celsius.

Clause. 3. After the cooling is completed, the removed rails are deflected vertically by the first roller press, and the rails are straightened in the horizontal direction by the second roller press. Each rail then passes through the border, allowing the inspector to visually inspect the bottom and rails, and then use a circular saw to cut the rails into a standard 25-metre length.

Finally mass air tubes.

The department will randomly measure the size of the rail sample to ensure that the track size is correct. In addition, each rail has a lot number that is used to confirm which batch of steel it is made from, which helps the factory track all the rails of that vertical lot. After these processes, the rails are safe to use.

The rails of the train are made of holes with some special processes, and they are all spaced and distanced, the first point of the train track is very important, the second point is made by a special mold of silver beams, and the third point is made of special technology to measure the size of the front trembling operation.

Trains have now become one of the main means of transportation for dust destruction, and the rails of the fire-buried recoding car need to have uniform specifications in the process of making bends, and relatively hard iron blocks must be selected.

These results must be manufactured first, and then the results of bending and excited can be arranged and combined. There will be a professional factory to quietly manufacture each section of the railroad socks buried socks, and then stitch these results.

The rails of the railway are made of high manganese steel.

If 2-3% manganese is added to the steel, then the resulting low-manganese steel is brittle like glass and will shatter when struck. However, if 13% manganese is added to make high-manganese steel, then it becomes both hard and tough. So people use manganese steel to make wear-resistant machine parts and rails, bridges, etc.

In the upper part of the rail, the layer in contact with the wheel, another metal is added: indium, and the addition of indium makes the upper part of the rail more resilient under the condition of ensuring the hardness, which is very important for the wheels of the train, and when it contacts and collides with the "hoop", it will have a certain elasticity to ensure the safe operation of the train.

1. The rails of all railways are composed of steel, which can be divided into ordinary manganese-containing rails, copper-containing carbon steel rails, high-silicon copper-containing steel rails, copper rails, manganese rails, silicon rails, etc.

The main domestic rail grades are U74, U71MN, PD2, PD3 and BNBRE, of which PD2 is a full-length quenched rail with ordinary carbon steel SQ process; PD3 is a high-carbon microvanadium low-alloy rail, and BNBRE is a niobium-containing rare earth-treated low-alloy rail.

Appendix related: referred to as rails, rails, tracks, etc. It is used on railways and works with switches to allow trains to travel without steering. The track usually consists of two balanced steel rails. The rails are fixed on the sleepers, and the ballast is under the sleepers.

Railway rails are made of steel and can bear more weight than other materials. Sleepers, also known as sleepers, gray sleepers, or sleepers, are used to distribute the weight of the rails separately, and to keep the rails fixed and maintain the gauge of the rails.

In general, the bottom of the track is a gravel-paved ballast. Ballast, also known as ballast, gravel or track bed, provides elasticity and drainage to the track. Rails can also be laid on concrete pedestals (which are quite common on bridges) or even embedded in concrete.

Orbital composition. In the 80s of the 20th century, the standard gauge (see Railway Track Geometry) used by most railways in the world was 1435 mm (4 ft 8 (1 2 in)). Those that are narrower are called narrow-gauge railways, and those that are wider are called broad-gauge railways (see Railway Engineering). Sleepers are generally laid transversely and are made of wood, reinforced concrete or steel.

The track bed is made of gravel, pebbles, slag and other materials. Rails, sleepers, and track beds are some materials with different mechanical properties that are combined in different ways. The rails are fastened to the sleepers with connecting parts; The sleepers are buried in the track bed; The track bed is laid directly on the roadbed surface.

The track is subjected to a variety of vertical, transverse and longitudinal static and dynamic loads, which are transferred from the rail to the roadbed through the sleepers and track beds. Through the theory of mechanics, the stresses and strains generated by each component of the track under various load conditions are analyzed and studied, and their bearing capacity and stability are determined.

The rails are made of high manganese steel.

The temper of manganese steel is very strange and interesting: if you add 2-3 manganese to the steel, then the resulting low-manganese steel is brittle like glass and will shatter when you knock it. However, if 13 manganese is added to make a high manganese steel, then it becomes both hard and tough.

Of course, the rails are special alloy steel.

China's steel rails can be divided into three types: crane rail (crane rail), heavy rail and light rail with the approximate weight of kilograms per meter

The crane rail is divided into four types: QU120, QU100, QU80 and QU70, and the material is generally manganese steel, and the largest single weight is QU120 up to 118kg m.

Heavy rails. According to the steel type used, it is divided into: ordinary manganese-containing rails, copper-containing carbon steel rails, high-silicon copper-containing steel rails, copper rails, manganese rails, silicon rails, etc.

There are three main types of kg. In addition, there are 45 kg rails for a few lines, and 60 kg rails are planned for high-volume and high-speed lines. GB2585-81 stipulates the technical conditions of 38 50kg m rails in China, and its dimensions and codes are shown in Table 6-7-10.

In 2007, China promulgated a new standard GB 2585-2007, in addition to 38 50kg m, a new 60kg m heavy rail and 75kg m heavy rail were added.

Fast, high-volume, electrically protracted rail transit built in cities. Trains run on fully enclosed lines, and the lines located in the central city are basically located in underground tunnels, and the lines outside the central city are generally located on viaducts or on the ground.

The subway covers a variety of underground and above-ground right-of-way exclusive, high-density, high-volume urban rail transit systems in urban areas, which is called MRT in Taiwan, China.

In addition to subways, this also includes elevated railways or railways laid on the road. Therefore, the subway is exclusive to the right of way and has no level crossing, which is also the fundamental sign that distinguishes the subway from the light rail transit system. The world's first (and first) metro was the Metropolitan Underground in London, England, which was built in 1863.

Manganese steel can be eliminated method, aluminum hardness is not enough, titanium alloy is expensive.

The utility model discloses a kind of rail transit vehicle interior composite material comprises a metal substrate (1), and is mainly characterized by the fact that it is provided with a coating layer (2) on one side surface of the metal substrate (1). It has the characteristics and efficacy of reasonable structure, light weight, flame retardant, low smoke and non-toxic, durable, good shielding performance and suitable for interior modular design and construction.