Steam Turbine Nozzle Ring Assembly
Steam turbine nozzle ring assemblies consist of circular arrays of precision nozzles that accelerate steam into high-velocity jets impinging on turbine blades, optimizing expansion efficiency. These assemblies are classified as 'other' parts under tariff item 8406.90.39, as they are not rotors, blades, or other specifically named turbine components.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the nozzle ring assembly includes stationary blades
Other blades, rotating or stationary, are classified under this sibling item.
If the nozzle ring is for repair or remanufacture of steam turbines
This item covers blade diaphragms and shafts for repair or remanufacture.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Clearly identify the nozzle ring as a stationary part of the turbine to distinguish it from rotating blades
• Provide technical drawings showing the nozzle geometry to support classification
• If the nozzle ring is imported with blades, consider whether the set constitutes a complete stage requiring different classification
Related Products under Tariff item 8406.90.39
Steam Turbine Bearing Housing
A bearing housing that encases and supports journal or thrust bearings in steam turbines, maintaining shaft alignment under high loads. It is a part of a steam turbine of heading 84.06, specifically for turbines of 8406.81.00 or 8406.82.00. As it is not a rotor, blade, or repair/remanufacture part, it falls under 8406.90.39 as 'other' parts.
Steam Turbine Bellows Expansion Joint
A multi-ply stainless steel bellows expansion joint that compensates for thermal expansion between turbine casing sections. It is a part of a steam turbine of heading 84.06, specifically for turbines of 8406.81.00 or 8406.82.00. As it is not a rotor, blade, or repair/remanufacture part, it falls under 8406.90.39 as 'other' parts.
Steam Turbine Blade Carrier Disc
Forged discs that serve as carriers for turbine blades, providing structural support in high-pressure stages of steam turbines. They are parts of a steam turbine of heading 84.06, specifically for turbines of 8406.81.00 or 8406.82.00. As they are not rotors, blades, or repair/remanufacture parts, they fall under 8406.90.39 as 'other' parts.
Steam Turbine Blade Locking Kit
Specialized pins, keys, and rivets that secure blades to turbine discs against centrifugal forces, sold as maintenance kits. They are parts of a steam turbine of heading 84.06, specifically for turbines of 8406.81.00 or 8406.82.00. As they are not rotors, blades, or repair/remanufacture parts, they fall under 8406.90.39 as 'other' parts.
Steam Turbine Coupling Shaft
High-strength forged shafts that connect turbine rotors to generators or loads, transmitting rotational power. They are parts of a steam turbine of heading 84.06, specifically for turbines of 8406.81.00 or 8406.82.00. As they are not rotors, blades, or repair/remanufacture parts, they fall under 8406.90.39 as 'other' parts.
Steam Turbine Diaphragm Staging
Steam turbine diaphragm staging assemblies consist of stationary diaphragm rings with precision-mounted guide vanes that direct steam flow onto the rotating blades for optimal energy extraction. These components are essential for controlling steam pressure and velocity through the turbine stages, and are classified as 'other' parts under tariff item 8406.90.39, distinct from rotors, blades, or casings.