What categories can alloy steel forgings be divided into according to their uses?

Alloy steel forgings in mining machinery are mainly classified into these categories based on their work and responsibilities in the equipment. This is the destiny gate for selecting materials. If you make a mistake, it may cost money or cause trouble

Structural and transmission components for carrying heavy blows, transmitting strong force, and saving lives:
》What kind of work did you do? These are the "skeleton frame" and "strength conveyor belt" of the equipment. The main task is to withstand huge static loads, impact loads, and repeated fatigue loads, ensuring that the equipment structure does not fall apart and the power transmission is in place. For example, the boom, boom, key pin shafts on the boom, transmission gears, main shaft, and large connecting rods of a large excavator.
》What skills do you need? The strength and resilience of the sky are the core! Especially with good low-temperature impact toughness, it cannot be brittle even in cold weather. It also needs to have sufficient fatigue life to withstand millions of back and forth twists and turns. Weldability is usually also important because many are assembled by welding large components. Wear resistance is not the top priority.
》What type of steel is commonly used? Low to medium alloy steel is the main force. By using reasonable alloying elements (such as Cr, Mn, Mo, Ni, V) to enhance strength, toughness, and hardenability (ensuring that the large cross-sectional core performance is also hard enough). High alloy steel is usually not cost-effective and unnecessary here.

Wear resistant parts that are hard hit and worn by stones:
》What kind of work did you do? These are the 'skin' of the equipment, directly engaging in close combat with minerals, rocks, and slag, being smashed, ground, and scraped every day. For example, the hammer head, jaw plate, plate hammer, rolling mill wall/crushing wall (lining plate) of the crusher, the lining plate and grinding ball of the ball mill, the bucket teeth and side blade plate of the excavator, and the chute lining plate of the conveying system.
》What skills do you need? wear-resisting! wear-resisting! Still wear-resistant! The hardness should be high, and the ability to resist scratches and cutting wear should be strong. At the same time, depending on the working conditions, it may be necessary to balance a certain level of impact toughness (such as the hammer head and jaw plate being afraid of being crushed by large ore), or high temperature wear resistance (such as hot material processing equipment). The requirements for toughness and weldability are usually lower than those of the first category.
》What type of steel is commonly used? High alloy steel is the protagonist. High manganese steel (with a high Mn content and impact hardening) is still the ace of many strong impact wear parts. High chromium cast iron/steel (with a high Cr content) provides superhard carbides, making it a great tool for dealing with grinding and wear. Wear resistant alloy steel (containing Cr, Mo, Ni, etc.) is widely used when balancing wear resistance and toughness.
Soaking sewage and corrosion-resistant parts:
》What kind of work did you do? These components are immersed in corrosive environments year-round, such as wet mines, acidic and alkaline slurries, seawater beneficiation environments, chemical treatment processes, etc. It's not enough to just grind it, you also need to be able to withstand rust and corrosion. For example, the impeller, pump casing, and valve body of the slurry pump, the stirring shaft and blades of the flotation tank, and the flanges and fittings of the pipeline system.
》What skills do you need? Corrosion resistance is the top priority! It should be able to resist the erosion of specific corrosive media (acid, alkali, salt, hydrogen sulfide, etc.). It may be necessary to balance a certain level of wear resistance (if the medium contains solid particles) and strength.
》What type of steel is commonly used? The stainless steel family in high alloy steel is the core. Martensitic stainless steel (balancing strength, wear resistance, and certain corrosion resistance) is widely used. Austenitic stainless steel (with stronger corrosion resistance) is used in more demanding environments. Dual phase stainless steel (with better strength and corrosion resistance) appears in high-end applications. Some special corrosion-resistant alloy steels (such as copper containing steels) may also be used.

Play with special and extraordinary special features:
》What kind of work did you do? In addition to basic forces, grinding, and corrosion, these components also have some special requirements or capabilities. For example, components that need to maintain strength for a long time at high temperatures (such as hot blast stove parts), components that require non-magnetic properties (such as parts near certain detection equipment), or components that require extremely low/high thermal conductivity in specific situations.
》What skills do you need? Meeting that special functional requirement is the top priority! It may be high temperature strength (thermal strength), non-magnetic, specific thermal/electrical conductivity, extreme low temperature toughness, etc. Other performance is matched around this core.
》What type of steel is commonly used? High alloy steel is the main choice, and may even be special alloys such as nickel based and cobalt based. The specific selection of materials depends entirely on what the special requirements are. For example, high-strength steel usually contains more Cr, Mo, and V; Non magnetic steel is usually a high manganese austenitic steel or special alloy.