27SiMn seamless steel pipe is a type of alloy structural steel, commonly known as silicon-manganese seamless steel pipe. It contains carbon in the range of 0.24-0.32% and has a silicon-manganese content of approximately 1.10-1.40%. This steel is composed of five main elements: carbon (C), silicon (Si), manganese (Mn), phosphorus (P), and sulfur (S). The combination of these elements gives the material excellent mechanical properties and makes it suitable for various industrial applications.
This seamless steel pipe is widely used in power plants, boiler systems, chemical industries, automotive components, and shipbuilding parts. It is also recognized by its unified numerical code A10272 and complies with the GB/T 3077-1999 standard.
One of the key advantages of 27SiMn steel is its superior performance compared to 30Mn2 steel. It exhibits high hardenability, with a critical quenching diameter of up to 8–22mm when quenched in water. Additionally, it offers good machinability, cold formability, and weldability. The steel maintains good toughness after heat treatment, and it retains relatively high strength and wear resistance, especially when quenched in water. However, it is important to note that this material is sensitive to white spots and may develop tempering brittleness or overheating during heat treatment.
In terms of application, 27SiMn seamless steel pipe is typically used in the tempered condition to manufacture hot-stamped parts that require high toughness and wear resistance. It can also be supplied in normalized or hot-rolled conditions, such as for tractor track pins and other similar components.
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