The impeller of a centrifugal compressor plays a core role in its structure, and the material selection of the impeller directly affects the performance, lifespan and applicable working conditions of the equipment. The impeller is installed on the horizontal pinion shaft inside the gearbox. In the figure below, each end of the pinion shaft is equipped with an impeller, which is a common configuration. However, it is equally common to have only one impeller installed on each pinion shaft.

Surface treatment is a process method that artificially forms a surface layer with mechanical, physical and chemical properties different from those of the base material on the surface of the base material. The purpose of surface treatment is to meet the requirements of corrosion resistance, wear resistance, decoration or other special functions of the product. For metal castings, surface heat treatment of lead screws and guide rails is a commonly used surface treatment method.

The main technical classifications of gear manufacturing processes can be divided into the following categories:

In some cases, the corrosion resistance of stainless steel depends on the material series it belongs to. But generally speaking, the key lies in the content of the alloying element molybdenum. A rule of thumb is that the higher the molybdenum content, the stronger the corrosion resistance of the material. Molybdenum can also enhance the material's strength at high temperatures. Let's explore many commonly used stainless steel grades and determine their corrosion resistance levels based on the presence of molybdenum.

The basic theories and methods of gear design mainly revolve around the geometric characteristics, mechanical properties, contact analysis, and lubrication conditions of gears. The following is a summary of the basic theories and methods of gear design based on the information I have gathered:

In the field of heat treatment of metallic materials, quenching is an extremely crucial and commonly used process. It involves heating the metal material to an appropriate temperature and maintaining it for a certain period of time, followed by cooling at an appropriate rate, thereby altering the internal microstructure of the material and significantly enhancing its mechanical properties, such as hardness, strength, and wear resistance. As an advanced form of quenching, ultrafine-grained quenching has attracted extensive attention in the field of materials science in recent years. Through specific technological means, it enables the metal material to obtain an ultrafine-grained microstructure after quenching, further endowing the material with superior comprehensive performance. It has demonstrated great application potential in numerous fields with extremely high requirements for material performance, such as aerospace, automotive manufacturing, and mold industry.

In chemical heat treatment, all three methods aim to enhance the hardness, wear resistance, fatigue strength, and other properties of the surface of parts while maintaining the toughness of the core. They all fall under the category of chemical heat treatment. The following provides a detailed explanation of their differences and characteristics:

Forging production includes free forging, die forging, sheet metal stamping and metal extrusion, which is an important part of metal pressure processing. Free forging is an operation carried out on a forging hammer (or press), where the up and down movement of the hammer head (or die block) causes the heated ingot (or billet) to be compressed in height (or thickness) and freely elongated and widened in the horizontal direction. Various forging processes are adopted to obtain the required shape and size of the forged part, as shown in Figure 1a. Die forging involves placing the heated billet in a die cavity of a fixed shape to deform it. The die cavity walls restrict the free movement of the metal. When the die forging process is completed and the metal fills the die cavity, the desired shape and size are obtained. Sheet metal stamping uses sheet metal or strip metal, in a cold state, on a press, where the interaction between the punch and the die is used to stamp out the products or parts we need, as shown in Figure 1c. Extrusion involves heating the metal ingot (or billet), placing it in an extrusion cylinder, and under the action of the extrusion rod, the metal flows out from the die hole at the other end of the extrusion cylinder, obtaining various profile sections with irregular cross-sections, tubes and bars. Moreover, some cross-sectional shapes cannot be obtained by rolling methods.

Centrifugal compressors are widely used in gas transmission, power generation, and chemical engineering, among other fields. The design of their blades is crucial to performance and efficiency. This article compiles the provided user information, references engineering principles and the latest research, to ensure the comprehensiveness and accuracy of the content.

Steel C45 and 40Cr are two commonly used medium carbon steels that are widely applied in mechanical manufacturing. However, there are significant differences in their chemical composition, properties, and applicable scenarios. The following is a detailed comparison:

The manufacturing process involves multiple steps, with the goal of obtaining parts that meet requirements for dimensional accuracy, shape accuracy, positional accuracy, surface roughness, surface hardness, and microstructure. The process flow depends on the material, batch size, precision requirements, and structural characteristics (integral vs. assembled).

When choosing materials, the core considerations are strength, toughness, wear resistance, impact resistance, machinability and cost. Heat treatment is the key to achieving high performance of the materials.