30CrMo is a low alloy steel and is a steel type in China's national standard GB 3077. Among them, "30" refers to the carbon content. It must be tested before use to confirm its composition before use. Cr and Mo represent two alloying elements: chromium and molybdenum respectively. This steel has higher chromium and molybdenum content, which improves its resistance to heat, wear and corrosion.
The chemical composition of 30CrMo mainly includes carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), chromium (Cr) and molybdenum (Mo). The specific content range is roughly: carbon (C) 0.26~0.34%, silicon (Si) 0.17~0.37%, manganese (Mn) 0.40~0.70%, phosphorus (P) ≤ 0.035%, sulfur (S) ≤ 0.035%, chromium (Cr) 0.80~1.10%, molybdenum (Mo) 0.15~0.25%. The ratio of these elements gives 30CrMo excellent mechanical and chemical properties.
As for the delivery status of 30CrMo, this usually depends on the specific application requirements and manufacturing process. Generally speaking, 30CrMo can be delivered in different heat treatment states, such as normalizing, annealing or tempering, etc. These heat treatment processes can influence the mechanical and chemical properties of steel to meet specific usage requirements.
30CrMo quenched and tempered, oil quenched and tempered at high temperature. The quenching temperature is 860-900°C, with an upper and lower fluctuation of 20°C allowed. After quenching, water cooling or oil cooling can be used; the tempering temperature is 490-590°C, and an upper and lower fluctuation of 50°C is allowed.
30CrMo steel is a low alloy structural steel with excellent mechanical properties and heat treatment capabilities. Its main features are reflected in the following aspects.
High strength and toughness: 30CrMo steel has high strength and toughness, which makes it very suitable for manufacturing parts that need to withstand high stress and impact, such as shafts, spindles, etc.
Good wear resistance: 30CrMo steel can further improve the surface hardness through appropriate heat treatment, making it have good wear resistance and suitable for manufacturing parts with high wear resistance requirements.
Excellent heat treatment performance: 30CrMo steel has good hardenability, and the critical hardenable diameter in oil after heat treatment can reach 15~70mm. Through appropriate heat treatment process, its hardness and comprehensive performance can be further improved to meet the needs of different applications.
High temperature resistance: 30CrMo steel can maintain high durability at high temperatures, and its thermal strength is also very good. It has sufficient high temperature strength below 500℃ and is suitable for high temperature working environments.
Good welding performance: 30CrMo steel has good welding performance, can be connected and repaired through common welding methods, and is easy to process and maintain.
30CrMo steel plate is a multifunctional low alloy steel with a series of excellent performance characteristics such as good weldability and processability. Suitable for the manufacture and application of a variety of important equipment.
The following are the main application areas of 30CrMo steel: Machinery manufacturing: Due to its high strength and toughness, 30CrMo steel is used to manufacture various mechanical parts, such as gears, bearings, shafts, etc. Oil and gas industry: This steel is widely used in the oil and gas industry to manufacture various drilling equipment, transmission pipelines, valves, etc. Can withstand high pressure, high temperature and corrosive working environment.Aerospace industry: Due to its high strength and good toughness, 30CrMo steel is also widely used in the aerospace field, such as aircraft landing gear, engine parts, etc. Vehicle manufacturing: In automobile and railway vehicle manufacturing, 30CrMo steel is used to manufacture key components such as engine blocks, crankshafts, connecting rods, drive shafts and steering components. These components need to withstand high loads and complex working environments. Construction engineering: 30CrMo steel is often used to manufacture various building structures, such as support columns and beams for large bridges, high-rise buildings and industrial plants. It can meet the strength and stability requirements of the building structure.
In addition, 30CrMo steel can also be used to manufacture tools, molds, oil drilling rigs, automobile brakes, pressure vessels and other parts with high strength and wear resistance requirements. It is also used for high-pressure pipelines working in non-corrosive media and nitrogen-containing hydrogen mixture media with temperatures below 250°C.
Although 30CrMo steel has a wide range of applications, specific applications need to be comprehensively considered based on factors such as the working environment, load conditions, material requirements, etc. to ensure the most appropriate material is selected.
