Cast steel valve, as a kind of casting alloy, are steel products made by pouring castings.
It is mainly divided into three categories: cast carbon steel, cast low alloy steel and cast special steel. This type of valve is often used to manufacture parts with complex shapes that are difficult to form by forging or cutting, and at the same time require high strength and plasticity.
Forged steel valves are various types of forgings and forgings produced by forging processes. Compared with cast steel parts, forged steel parts are of better quality, can withstand greater impact forces, and have excellent performance in plasticity, toughness and other mechanical properties. Therefore, forged steel parts are often the first choice when manufacturing important machine parts.
So, what are the similarities and differences between forged steel valves and cast steel valves?
Forged steel valves are superior to cast steel valves in quality. They can withstand greater impact forces and have excellent performance in plasticity, toughness and other mechanical properties. However, the nominal diameter of forged steel valves is usually small, generally not exceeding DN50. In contrast, the pressure rating of cast valves is lower, with the commonly used nominal pressure ranges of PN16, PN25, PN40, and 150LB-900LB. The pressure rating of forged steel valves is higher, including PN100, PN160, PN320, and 1500LB-3500LB.
Cast steel materials are mainly used to manufacture parts with complex shapes that are difficult to form by forging or cutting, and these parts are required to have high strength and plasticity. Casting is a liquid forming process, while forging is to manufacture workpieces through plastic deformation. The forging process can significantly improve the internal structure of the workpiece, improve mechanical properties, and ensure uniform grain distribution. Therefore, forging is an essential process choice for important workpieces. Although casting can also be used to manufacture complex workpieces in some cases, it may face the risk of organizational segregation and organizational defects.
Forged steel valves, also known as forged valves, are a type of valve manufactured by a special process. During the manufacturing process, the steel is plastically deformed by forging technology, which significantly improves the internal structure of the valve and improves its mechanical properties. This type of valve performs well in terms of impact resistance, plasticity, toughness and other mechanical properties, and is therefore widely used in many fields.
Forging technology can be divided into two categories according to its forming method:
(1) Closed-mode forging, also known as die forging, includes die forging, rotary forging, cold heading, extrusion and other methods. In this process, the metal billet is placed in a forging die of a specific shape and deformed by applying pressure to obtain the desired forging. According to the deformation temperature, closed-mode forging can be divided into cold forging (performed at room temperature), warm forging (forging temperature is lower than the recrystallization temperature of the billet metal) and hot forging (forging temperature is higher than the recrystallization temperature).
(2) Open forging, also known as free forging, is mainly divided into manual forging and mechanical forging. In this technology, the metal billet is placed between two anvils, and the metal billet is deformed by impact or pressure to obtain the desired forging.
Forging is an important part of the forging process.
Forgings are usually used for parts in machinery that are subject to high loads and face severe working conditions. For parts with simple shapes, rolled welded parts or profile plates can be selected. The forging process helps to eliminate weld holes and cast porosity in metal materials.
Reasonable selection of forging ratio is crucial to improving product quality and reducing production costs.
Commonly used forging materials include carbon steel, stainless steel and alloy steel. The forging ratio is defined as the ratio of the cross-sectional area of the metal before and after deformation. The original state of the metal may include ingots, bars, liquid metal, and metal powder.
Compared with castings of the same material, forgings usually have better mechanical properties.
Forging is a processing method that applies pressure to the metal blank through a forging machine to cause the metal blank to undergo plastic deformation, thereby obtaining a specific shape and size with improved mechanical properties.
Of course, different metal forming processes correspond to different application scenarios. Customers need to choose the process according to their customization needs. If you have large-volume valve customization needs, you can choose to cooperate with Mulan Metal. Mulan Metal supports various metal forming process production services, such as forging, casting, sheet metal, powder metallurgy, etc. It can meet the needs of different industries for metal forming. At present, our customers are in more than 30 countries. Looking forward to working with you.
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