1. Product Overview

The railway casting steel rail tie plate (also known as base plate or sole plate) is a critical load‑bearing component in railway fastening systems. Installed between the rail foot and the sleeper (timber or concrete), it performs the following essential functions:

• Load Bearing and Transmission – It receives the train loads from the rail and distributes them evenly over the sleeper and ballast bed, preventing localised stress concentrations that could damage the sleeper.

• Gauge Retention – The integral shoulders on the tie plate restrain lateral displacement of the rail, ensuring that the track gauge (e.g., standard gauge 1435 mm) remains within design limits.

• Providing Rail Cant – The bearing surface is machined with a specific slope (typically 1:40) to induce an inward cant (rail inclination), optimising wheel‑rail contact geometry.

• Extending Sleeper Life – By increasing the contact area between the rail base and the sleeper, it significantly reduces wear on the sleeper surface.

Manufactured by cast steel processes, this product offers superior strength, toughness and impact resistance compared to cast iron plates, making it particularly suitable for heavy‑haul railways, high‑speed lines and high‑axle‑load freight routes.

2. Product Classification

Based on shoulder configuration, cast steel tie plates are mainly classified as follows:

The double‑shoulder type is currently the most widely used worldwide. According to the number of bolt holes, they are also available in 2‑hole, 4‑hole, 5‑hole, 6‑hole and 8‑hole configurations.

3. Technical Parameters

3.1 Common Specifications

Below are typical dimensions for cast steel tie plates (custom sizes available on request):

Note: Dimension notation (e.g., 345/285/127/160×15/13) indicates length/width/thickness/other dimension × plate thickness/shoulder height – please refer to customer drawings for exact interpretation. All specifications can be custom‑made according to client drawings or samples.

3.2 Dimensional Tolerances

In accordance with general industry practice:

4. Material & Chemical Composition

4.1 Common Material Grades

The following grades are available depending on service conditions:

• Cast steel: ZG230‑450, ZG270‑500, ZG25, ZG35, ZG45

• Ductile iron: QT450‑10, QT500‑7, QT600‑3

• Carbon steel: Q235, 20#, 35#, 45#

• Low‑alloy cast steel: ZG25MnCrNiMo, etc.

4.2 Typical Chemical Composition (QT500‑7)

(For QT450‑10: C 3.40‑3.90, Mn 0.2‑0.5, Si 2.70‑3.00, P≤0.07, S≤0.03)

4.3 Mechanical Properties

5. Applicable Standards

Our products are manufactured and inspected in accordance with the following international, national and industrial standards:

Custom non‑standard sizes can also be produced according to customer drawings or samples.

6. Manufacturing Process

6.1 Casting Process

Cast steel tie plates are mainly produced via:

• Sand Casting – Economical for high‑volume production.

• Lost Foam Casting – High precision and good surface finish, suitable for complex shapes.

• Investment Casting – Excellent dimensional accuracy for demanding applications.

Process flow: Tooling design → Moulding/core‑making → Melting (medium‑frequency induction furnace, pouring temperature ~1580°C) → Pouring (vacuum maintained at 0.03 MPa) → Cooling → Shakeout & cleaning → Heat treatment (if required) → Surface finishing.

6.2 Alternative Processes (Optional)

Besides casting, tie plates can also be manufactured by forging or rolling. Forged plates have simpler geometry and lower tooling costs; cast plates allow more complex shapes (especially double‑shoulder designs). The optimal process can be selected based on specific requirements.

7. Surface Treatment

To enhance corrosion resistance and service life, we offer the following surface finish options: