Heat-resistant Steel Precision Casting

Characteristics of heat-resistant steel precision castings:

Heat-resistant steel precision castings should be stacked reasonably according to the layout characteristics during heat treatment to prevent deformation as much as possible. When the as-cast arrangement segregation of the casting is serious, in order to eliminate the influence on the function of the end of the casting, it is necessary to adopt a unified treatment method. In the as-cast arrangement, there are often coarse dendrites and segregation.
During heat treatment, the heating temperature should be slightly higher than that of forged steel parts with the same composition, and the austenitizing holding time should be extended appropriately. For steel castings with complex shapes and large wall thickness, the cross-sectional effect and casting need to be considered during heat treatment.
The main elements of high-temperature oxidation and high-temperature corrosion resistance in heat-resistant steel precision castings can improve the thermal strength of heat-resistant steel. The high temperature corrosion resistance of heat-resistant steel has a certain relationship with its chromium content.
Therefore, the chromium content of commonly used heat-resistant steel should not be lower than nickel, which is one of the important alloying elements in heat-resistant steel. In order to obtain the pure austenite structure of steel at room temperature, the nickel content is not less than 25%. However, when the steel contains other alloying elements, in order to obtain a pure austenite structure, the nickel content can be appropriately reduced.

How to clean heat-resistant steel precision castings:

Heat-resistant steel precision casting is a kind of casting. The cleaning of heat-resistant steel precision castings is divided into general cleaning, ultrasonic cleaning, degreasing cleaning and vacuum cleaning. They have their own characteristics, and the formulas of the cleaning solutions they use are different. Generally, cleaning agents include solvent-based cleaning solutions and water-based cleaning solutions.
In the actual cleaning process of heat-resistant steel precision castings, the most used ones are:

1. Metal cleaning agent
Mostly used for cleaning heat-resistant steel precision castings before heat treatment and chemical heat treatment
2. 3%-10% sodium carbonate or sodium hydrogen hydride cleaning solution, the temperature is controlled at 80-100°C, and it is mostly used for degreasing and salt slag finishing of heat-resistant steel precision castings after quenching.

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