Rotor Disk for Turbines and Expanders | Specifications and Verification

Product Specifications

Technical details and manufacturing context for Rotor Disk

Definition

The rotor disk is a critical rotating component within the turbine/expander section that serves as the mounting platform for turbine blades. It rotates at high speeds to convert thermal energy from working fluids into mechanical energy, transmitting torque through the shaft to drive compressors, generators, or other machinery. The disk is typically manufactured from high-strength materials such as nickel-based superalloys, titanium alloys, or high-strength steel, depending on the operating environment and mechanical requirements. The product is available in a range of configurations, with outer diameters from 200 to 1200 mm, bore diameters from 50 to 300 mm, thicknesses from 20 to 150 mm, and weights from 10 to 500 kg. Material grades include ASTM A182 F22, with tensile strength ranging from 485 to 620 MPa, yield strength from 275 to 345 MPa, and hardness from HB 156 to 207. Surface roughness is specified as Ra 0.8 to 3.2 µm, flatness tolerance as 0.02 to 0.10 mm, and parallelism tolerance as 0.02 to 0.08 mm. Operating temperature ranges from -40 to 400 °C, and maximum speed ranges from 3000 to 15000 rpm. Dynamic balance grades per ISO 21940-11 are G2.5 to G6.3. These values are reference ranges and must be confirmed for the specific model and application. The rotor disk is designed to meet stringent dimensional and balance requirements to ensure reliable operation at high rotational speeds. It is essential to verify all specifications with the legal manufacturer or supplier before procurement, as actual values may vary based on the intended use and material selection.

Working Principle

The rotor disk rotates at high angular velocities driven by the impulse or reaction forces from high-pressure, high-temperature gases or steam flowing through the turbine. The blades attached to the disk's periphery extract energy from the fluid, causing the disk to spin and transfer rotational energy to the connected shaft. The disk's geometry and material properties are critical to withstand centrifugal stresses and thermal gradients. Proper balancing and surface finish are essential to minimize vibration and ensure stable operation. The disk interfaces with the shaft through a bore, and its flatness and parallelism tolerances ensure uniform contact and load distribution. Maintenance signals include excessive vibration, surface wear, or dimensional changes, which may indicate imbalance or material degradation. Failure boundaries are defined by material fatigue limits, operating temperature, and speed ratings.

Common Materials

Nickel-based superalloy, Titanium alloy, High-strength steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Outer Diameter	200–1200 mm	Custom sizes available
Bore Diameter	50–300 mm	Matches shaft size
Thickness	20–150 mm	Depends on load
Weight	10–500 kg	Approximate, varies with size
Material Grade	ASTM A182 F22	Other alloys availableASTM A182
Tensile Strength	485–620 MPa	Minimum for F22ASTM A182
Yield Strength	275–345 MPa	Minimum for F22ASTM A182
Hardness	HB 156–207 HB	Brinell hardnessASTM A182
Surface Roughness	Ra 0.8–3.2 µm	Critical for sealingISO 1302
Flatness Tolerance	0.02–0.10 mm	Ensures uniform contactISO 1101
Parallelism Tolerance	0.02–0.08 mm	Maintains balanceISO 1101
Operating Temperature	-40–400 °C	Material dependent
Max Speed	3000–15000 rpm	Limited by balance
Dynamic Balance Grade	G2.5–G6.3	Per ISO 21940-11ISO 21940-11

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Blade Attachment Slots Part
Precision-machined slots or grooves for mounting turbine blades

Material: Same as disk material
Center Bore Part
Central opening for mounting on the turbine shaft

Material: Same as disk material

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Rotor Disk.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Turbine/Expander Section

View system integration details

Turbine Blades/Rotor

View system integration details

Manufacturers of Rotor Disk

Manufacturer profiles associated with Rotor Disk.

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Frequently Asked Questions

What materials are available for the rotor disk?

The rotor disk can be made from nickel-based superalloy, titanium alloy, or high-strength steel. The specific material grade, such as ASTM A182 F22, should be confirmed with the supplier based on your application requirements.

What are the typical size ranges for the rotor disk?

The outer diameter ranges from 200 to 1200 mm, bore diameter from 50 to 300 mm, thickness from 20 to 150 mm, and weight from 10 to 500 kg. These are reference ranges; exact dimensions must be confirmed for your specific model.

What standards apply to the rotor disk?

The rotor disk may be referenced to standards such as ASTM A182 for material properties, ISO 1302 for surface roughness, ISO 1101 for tolerances, and ISO 21940-11 for dynamic balance. Compliance should be verified with the manufacturer.

What are the operating limits of the rotor disk?

The operating temperature range is -40 to 400 °C, and the maximum speed is 3000 to 15000 rpm. These limits depend on material and design; always confirm with the supplier for your application.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 300 bar
flow rate:	Dependent on blade design and rotational speed
temperature:	-50°C to 650°C
slurry concentration:	Not applicable for clean gas/steam; for slurry expanders, max 15% solids by volume

Rotor Disk

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards