From Raw Material to Finished Product: The Manufacturing Process of 21NiCrMo2 Steel Grade

The manufacturing process of 21NiCrMo2 steel grade involves several steps, starting from raw material selection to the production of the finished product.

Raw Material Selection: The first step is to select appropriate raw materials for the production of 21NiCrMo2 steel grade. The main raw materials include iron, carbon, nickel, chromium, and molybdenum. The chemical composition and mechanical properties of the raw materials are carefully considered to ensure that they meet the desired specifications.

Melting and Refining: The selected raw materials are melted in a furnace at high temperatures. The molten metal is then refined to remove impurities and control the chemical composition of the steel grade. This process is carried out using various techniques such as vacuum degassing and ladle refining.

Casting: Once the molten steel is refined, it is cast into a desired shape using casting techniques. This can be done through continuous casting or ingot casting, depending on the desired product form and size.

Heat Treatment: After casting, the steel undergoes heat treatment processes to optimize its mechanical properties. This usually involves two main steps – hardening and tempering. Hardening involves heating the steel to a high temperature and then rapidly cooling it to increase its hardness. Tempering is a subsequent heating process that reduces the hardness and improves toughness and strength.

Mechanical Processing: Once the steel has undergone heat treatment, it is subjected to various mechanical processing techniques such as forging, rolling, and machining. These processes help shape the steel into its final form and dimensions.

Surface Treatment: After mechanical processing, the steel may undergo surface treatments such as polishing, coating, or plating to improve its appearance, corrosion resistance, or other desired properties.

Quality Control: Throughout the manufacturing process, quality control measures are implemented to ensure that the steel grade meets the specified chemical composition and mechanical properties. This includes testing the raw materials, monitoring the various manufacturing steps, and conducting final inspections on the finished product.

In terms of the chemical composition, 21NiCrMo2 steel grade typically contains around 0.17-0.23% carbon, 0.40-0.70% silicon, 0.60-0.90% manganese, 0.20-0.40% nickel, 0.60-0.90% chromium, 0.10-0.20% molybdenum, and trace amounts of other elements such as sulfur and phosphorus. The exact composition may vary depending on the specific manufacturing process and intended application of the steel.

Regarding mechanical properties, 21NiCrMo2 steel grade generally exhibits good toughness and high tensile strength. The exact mechanical properties, such as hardness, yield strength, and elongation, can be tailored through the heat treatment process, as mentioned earlier. It is important to note that the mechanical properties can also be influenced by factors such as the manufacturing technique and the specific requirements of the finished product.
21NiCrMo2 Steel grade
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