NEWS

In November 2025, Shanghai TOTEM Machinery Co., Ltd. was invited to participate in Metal-Expo’2025, the 31st International Industrial Exhibition, held at CEC Expoforum in St. Petersburg, Russia. As one of the most influential and professional exhibitions in the global metals and metallurgy industry,

Why do polar ships need higher-standard thrust shafts? In marine propulsion systems, the thrust shaft is a key component that transmits power from the main engine to the propeller, directly affecting the reliability of the vessel’s navigation.

A trommel screen is widely used in mining and bulk material processing where continuous size separation is required under demanding operating conditions.

Large industrial components create machining problems that rarely appear at smaller scales.

For reciprocating compressor cylinders operating in highly corrosive environments, 17-4PH martensitic stainless steel is the ideal material choice to meet HRC 30-34 hardness requirements. However, applying traditional complex three-layer water jacket structures to stainless steel results in severe casting defects, such as sand core sintering and shrinkage porosity. While the industry typically compromises by adopting a two-layer structure, this sacrifices the continuous water circulation and cooling efficiency. This article details TOTEM's engineering practice: by implementing a specific structural layout, we achieved effective communication between the water cavities without significantly increasing casting thermal joints. This solution successfully restores the circulating cooling path while ensuring the internal density of the casting, providing a reliable manufacturing path for complex stainless steel cylinder blocks.

A turbine shaft must transmit power while resisting deformation and maintaining reliable rotor behavior. Power and rotational speed establish transmitted torque, but torque alone cannot define the finished shaft.