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zh Overview of Pressure - Bearing Standards for Ductile Iron
2025-01-16 16:04:22 hits：0
The pressure - bearing standards of ductile iron vary depending on specific grades, application scenarios, and relevant standard specifications. Different grades of ductile iron possess distinct mechanical properties, thus corresponding to different pressure - bearing capacities.
Pressure - Bearing Standards of Common Ductile Iron Grades
- QT450 - 10: Its tensile strength is ≥ 450 MPa, the conditional yield strength is ≥ 310 MPa, and the elongation is ≥ 10%. In fields such as automotive parts manufacturing, for example, when manufacturing automotive crankshafts, gears, etc., QT450 - 10 can meet the pressure - bearing requirements under general working conditions. When an automotive engine is operating normally, the pressure on the crankshaft is within its pressure - bearing range, ensuring the stable operation of the engine. Moreover, in the context of ductile cast iron radial groove pressure, if there are radial grooves on related parts like the pulley in the engine transmission system, the pressure - bearing performance of QT450 - 10 also plays a crucial role in ensuring the normal operation of the pulley. For the ductile cast iron sheave radial groove pressure specifically, QT450 - 10's mechanical properties help the sheave withstand the forces exerted on the radial grooves during power transmission.
- QT700 - 2: The tensile strength is ≥ 700 MPa, the conditional yield strength is ≥ 420 MPa, and the elongation is ≥ 2%. It is suitable for parts with high - strength requirements, such as crankshafts and camshafts of diesel engines and gasoline engines. Taking the diesel engine crankshaft as an example, during the power stroke of the engine, the crankshaft has to endure significant pressure and torque. The high strength of QT700 - 2 enables it to withstand such high pressures, ensuring the normal operation of the diesel engine. In the case of components with radial grooves in high - stress environments, like some high - performance engine components with radial grooves, the high - strength characteristic of QT700 - 2 is vital for dealing with the ductile cast iron radial groove pressure. When considering the ductile cast iron sheave radial groove pressure in high - power engine systems, QT700 - 2 can effectively resist the complex forces acting on the sheave's radial grooves.
- Ductile Iron Pipes: According to the national standard "Ductile Iron Pipes, Fittings and Accessories for Water and Gas Supply" GB 13295 - 2013, the design value of the tensile strength of ductile iron pipe materials should be 210 N/mm². In municipal water supply pipe networks, ductile iron pipes can withstand a certain water pressure. For instance, in the medium - and small - diameter water supply pipe networks of a city, ductile iron pipes can bear the normal water supply pressure, meeting the water demand of urban residents.
Factors Affecting the Pressure - Bearing Standards of Ductile Iron
Chemical composition, manufacturing processes, heat treatment processes, etc. all affect the pressure - bearing standards of ductile iron. Strictly controlling the chemical composition, such as the contents of elements like carbon, silicon, manganese, sulfur, and phosphorus, can ensure the stable performance of ductile iron. For example, appropriately increasing the silicon content can improve the strength and hardness of ductile iron, but an excessive amount may lead to a decrease in toughness. These factors also have a significant impact on the ductile cast iron radial groove pressure. Different chemical compositions and manufacturing processes can change the material properties around the radial grooves, thereby affecting their ability to withstand pressure.
Case Analysis
In the construction of a sewage treatment plant in a certain city, the sewage pipes need to bear a certain amount of sewage pressure and external soil pressure. QT450 - 10 ductile iron pipes were selected. Their good pressure - bearing capacity and corrosion resistance enable them to stably withstand the scouring and pressure of sewage during long - term operation, ensuring the normal operation of the sewage treatment system.
Another example is that Tiegu produced a ball mill tooth shaft using QT700 - 2 ductile iron. During the operation of the ball mill, the tooth shaft has to bear huge impact forces and pressures. The high strength and high wear resistance of QT700 - 2 enable it to meet the pressure - bearing requirements of the tooth shaft, extending the service life of the tooth shaft and improving the working efficiency of the ball mill. In the case of the ball mill tooth shaft, if there are radial grooves designed for specific functions (such as lubrication channels or stress - reducing structures), understanding and calculating the ductile cast iron radial groove pressure becomes crucial for ensuring the reliability of the tooth shaft.
Tiegu has more than ten years of experience in the steel casting industry. With its self operated resources of ductile pig iron, it can provide global users with low-priced and high-quality ductile iron casting products.
