Low-alloy cast iron

Low alloy cast iron - This metal contains a number of alloying components, namely Ni, Cr, Cu, Al, Ti, W, V, Mo, as well as Mn 2% and Si 4%. It is this alloy content that makes it possible to improve the surface of products. Low-alloy cast iron has such a perfect surface that it allows the production of parts used in glass forming machines.

The properties that low-alloy cast iron received thanks to its components

Alloying elements are classified by groups or individual elements, each of which plays a specific role. Manganese, nickel, chromium, titanium, and selenium impart a fine-grained structure to cast iron. Phosphorus significantly improves fluidity, allowing for full filling of the workpiece or product. Selenium and sulfur impart a pleasing structure to cast iron that is easy to machine, which in turn improves the quality of the machined surface. The chemical reaction of zirconium improves anti-corrosion properties and surface quality. Low-alloy cast iron The casting is poured into chill molds preheated to 400-450 degrees Celsius. Then, a normalization process is carried out at 930-950 degrees Celsius, and the final stage is tempering at 700-720 degrees Celsius.

Low-alloy cast iron grades

Low-alloy cast iron grades They are widely varied. The qualities and chemical and physical characteristics of this metal determine its widespread use. Low-alloy cast iron is marked using letters and numbers. The following designations are used:

• "Ч" means cast iron containing an alloying element;
• The next letter indicates which alloying element is present (element names according to their chemical designations);
• The number draws attention to the average content of this element.

Everyone without exception grades of low-alloy cast iron contain 1-3% alloying elements.

Some grades have special applications and are produced primarily for specific purposes. For example, CHN2Kh is used for parts with high mechanical properties, strong resistance to wear and corrosion in gaseous and slightly alkaline environments (e.g., oxygen). CHN stands for nickel cast iron. CHN3KhMDSh, CHNKhMDSh, CHNMSh, CHNKhMD, and CHNKhT have similar application characteristics, but also include use in internal combustion engines. CHS5 and CHS5Sh are grades of low-alloy cast iron Used for heat-resistant parts exposed to flue gases and air at temperatures of 700–800 degrees Celsius. These grades are siliceous. ChKh1, ChKh2, ChKh3, and ChKh3T are chromium-containing grades used for parts subject to increased corrosion in gas, air, and alkaline environments, as well as friction and wear. ChYuKhSh contains aluminum, is heat-resistant, and exhibits good abrasion resistance.

Some of the listed brands are successfully used in the automotive industry in the manufacture of cylinder liners, piston rings, camshafts. These grades of low-alloy cast iron Increase the service life of smelting boilers to 3–5 years. SChSh-1 and SChSh-2 cast irons are quite resistant to alkaline solutions, while ZhChNDKh-15, ZhChNDKh-7, and ZhChNDKh-2 cast irons, thanks to their nickel content, are successfully used for safety membranes operating in aggressive environments heated to 400 degrees Celsius.