Railroad Sleepers Fixing Tie Plate For Rail Onto Or Concrete Sleepers

1. Production for Railroad Sleepers Fixing Tie Plate Use For Rail Onto Or Concrete Sleepers

The railway cast iron backing plate is produced by the lost foam method, and is smelted in a 60kg intermediate frequency electric furnace. During the pouring process, the vacuum degree is maintained at 0.03 MPa, and the pouring temperature is 1580°C. Its chemical composition w is: 0.46%C, 0.23%Si, 0.59%Mn, 0.015%S, 0.024%P. After the casting is boxed, it is shot blasted and then annealed. The heat treatment process is: heating temperature 850℃; holding time 2h, cooling to room temperature with the furnace (total 12h).

2. Organizational analysis of the fracture of the iron pad OEM Hot Forging Forged casting Railway Tie Plate of Rail Fastening

The body is sampled, and the as-cast and heat-treated castings are cut separately directly with a wire cutting machine, and the middle part is cut and prepared into several 10mm×15mm metallographic samples. Observe the metallographic structure with a metallographic microscope. It is the as-cast microstructure. It can be seen that the as-cast structure of the iron backing plate casting is ferrite + pearlite + Widmanstatite. Among them, the Widmanstatite structure is a continuous network, and a small amount of acicular Widmanstatten extends into the crystal grains. The research results show that when the carbon content of cast carbon steel exceeds 0.3%, the Widmanstatten structure will be produced when the grains are coarse. The main factors affecting the formation of Widmanstatten structure mainly include: austenite grain size, cooling rate and chemical composition. This Widmanstatten structure is brittle. Therefore, in order to improve the impact resistance of the backing plate casting, it must be eliminated by normalizing or annealing heat treatment. The factory originally used annealing heat treatment, which is the microstructure of the backing plate castings after annealing treatment, and there is a large amount of lath-shaped Widmanstatite. It can be judged that the annealing treatment did not eliminate a large amount of lath-shaped Widmanstatite. As a result, the existence of a large amount of lath-shaped Widmanite caused the backing plate castings to break when subjected to impact after being annealed. After careful inspection of the annealing equipment, it was found that the sealing performance of the annealing furnace door was poor, and the temperature control instrument of the annealing furnace had been damaged. Process requirements.

3. Improvement of iron pad production process OEM Hot Forging Forged casting Railway Tie Plate of Rail Fastening

Based on the above analysis results, improvement measures are proposed: re-repair the annealing equipment, improve the sealing performance of the annealing furnace door, and ensure that the temperature in the furnace meets the process requirements. After rectification, the original annealing process is still implemented, and the unqualified castings are re-heated. After metallographic inspection, it is found that the iron pad castings after annealing treatment no longer have a large amount of lath-like Widmanstatite. The impact test results show that there is no longer any quality problem that is prone to fracture when subjected to impact. Due to the simple structure of the piece, in order to simplify the process, shorten the production cycle, improve production efficiency, and reduce costs, according to the shape and structural characteristics of the casting, the normalizing process is adopted. The specifications are as follows: heating temperature 850 ℃; holding time 1h, air cooling to room temperature . After the factory adopted the normalizing process, the iron backing plate castings did not break under the same impact. The production cycle is shortened, the production efficiency is improved, and the cost is reduced.

Other products supplied by Kingrail:

Rail car spares: wheels, axles, bearings, gears, couplers, etc

Railway Track materials: Tie plates, fishplates, screw spikes, bolts and nuts, steel rails and accessories, joint bar, gauge rod, etc

1. Railway Fishplate / Joint Bar/ Splice Bar
1) Type: To 90ARA,100RE,115RE,132RE supporting the North America markets joint bar.
To UIC50,UIC54,UIC60 supporting the Europe, Asia, and Africa fish plates.
To TJ45; TJ57 supporting the South America markets splice bar.
To BS60; BS75;BS80A,BS90 supporting the British Commonwealth fishplates.
2) Raw material: 45#, 50#, B7,etc.
3) Surface: Natural or Paint.
2. Railway Rail Baseplate/Rail Steel Plate
1) Type: For 100RE,115RE,132RE,136RE,90ARA-A,UIC50,UIC54,UIC60,TJ45,TJ57,BS69,BS75,BS80A,BS90 rail,etc.
2) Raw Material: 45#,QT400-15, QT450-10.QT500-7.

3) Process: Forging,Casting,Rolled.
4) Surface: Natural,Oil,etc.
3. Screw Spike/Sleeper Screw/Railway Rail Fasteners
1) Type: Ss series square spikes from Ss1/130 to Ss25/165 and BS square spike, Twisted spike, 70 type spikes,etc.
2) Raw Material: Q235, 45#, 55#,55Q,etc.
3) Grade: 4.6, 4.8,5.6, 8.8.
4) Surface: Natural (oil), Black paint, Zinc, etc.
4. Dog Spike/Railroad Spike/Track Spikes
1) Type: 5/8×6’’9/16×5-1/2’’,3/8×3-1/2’’,1/2×3-1/2’’,16×16×165,15.9×139.7;etc.
2) Raw material: Q235, 55#, 45#, 40Mn2, 20MnSi;etc.
3) Grade: 4.6 4.8 5.6 6.8 10.9 12.9.
4) Surface: Natural, Black, Zinc; etc.
5. Rail Clip/E clip/Fast Clip/SKL Clip/Pandrol Clip
1) Type: E1609,E1809,E1817,E2055,E2056,E2009,E2001,E2006,PR401,PR309,etc.
2) Raw Material: 60Si2MnA,38Si7,etc.
3) Surface: Natural (oil); Black Paint; Color Paint; Zinc; etc.
6. Fishtail Bolt/ Joint Bar Bolt/Fishbolt
1) Type: To 115RE; 132RE joint bar supporting the US-made AREMA track bolts;
To UIC54; UIC60 fishplate supporting the UIC track bolts and square bolts;
To BS60; BS75 fish plate matching the European standard fish bolt.

To TJ45; TJ57 splice bar supporting South America standard fishtail bolt.

Railway bolts: T bolt, HS26, HS32 series T bolt, turnout, hex bolt, Subway bolts.
2) Grade: 4.6, 4.8, 8.8, 9.8, 10.9, 12.9,etc.
3) Material: Q235, 35#, 45#, 40Cr; etc.
7. Rubber Pad/Under Rail Pad/Rubber Crossing Plate
1) Type: R54 1435mm, R54 1067mm, R60 1435mm, ZW687, ZW700.
Pandrol series #7, #8, #9, #11, #12, #13 Nylon Insulators.
2) Raw Material: Rubber.
3) Surface: Natural.
8. Clamp Plate/Rail Clamp/Anchor Plate
1) Type: KPO1,KPO3, KOP06, 9116/08/29;9116/08/37;9216/08/40,9216/08/44,etc.
2) Raw Material: Q235.45#,etc.
3) Surface: Natural, Black Paint,Zinc, etc.
9. Rail Shoulder
1) Type: For90RE,100RE,115RE,136RE rail, etc.
2) Raw material: QT400-15.QT450-10.QT500-7,etc.
3) SURFACE: Natural.
10. Steel Rail Turnout/Rail Switch
1) Used in UIC54,UIC60,54E1,60E1,115RE, 132RE,BS80A, railway rail.
2) Specification:UIC54,UIC60,115RE, 132RE, 100RE,BS80A,60E1,54E1.
3) Raw material:High Manganese Steel