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P22 alloy steel pipe
The greatest advantage of P22 alloy steel pipe lies in its 100% recyclability, aligning perfectly with China's environmental protection and energy-saving policies. The government actively promotes the use of high-pressure alloy pipes across various fields.
Depending on their manufacturing process, these pipes can be classified as either hot-rolled (extruded) or cold-drawn (rolled) seamless steel pipes. Cold-drawn (rolled) pipes further come in round and special shapes.
In terms of production flow:
- Hot-rolling (extrusion) involves heating round billets, piercing them, rolling them into tubes, and then cooling and straightening them before testing and storage.
- Cold-drawing (rolling) requires additional steps like annealing, pickling, oiling, multiple passes of cold drawing, heat treatment, and final inspection.
Seamless steel pipes serve diverse purposes:
- GB/T8162-1999 (Structural Seamless Steel Pipe) is primarily used in construction and machinery, featuring materials like carbon steel 20, 45 steel, and alloy steels like Q345 and 20Cr.
- GB/T8163-1999 (Fluid Conveyance Seamless Steel Pipe) is used in large-scale equipment and engineering projects, often made from 20 and Q345 steel.
- GB3087-1999 (Low and Medium Pressure Boiler Seamless Steel Pipe) is used in industrial and home boilers, typically made from 10 and 20 steel.
- GB5310-1995 (High Pressure Boiler Seamless Steel Pipe) is used in power plants and nuclear facilities, using materials such as 20G and 12Cr1MoVG.
- GB5312-1999 (Seamless Steel Pipe for Ships) is used in marine boilers, employing materials like 360, 410, and 460 steel grades.
P22 alloy steel pipes are predominantly used in high-pressure pipelines. Other standards include GB9948-1988 (Petroleum Cracking Seamless Steel Pipe), GB18248-2000 (Gas Cylinder Seamless Steel Pipe), and GB/T17396-1998 (Hydraulic Prop Seamless Steel Pipe).
For welded steel pipes, materials vary based on application:
- GB/T3092-1993 (Low Pressure Fluid Transport Galvanized Welded Steel Pipe) uses Q235A steel for general fluid conveyance.
- GB/T14291-1992 (Mine Fluid Transport Welded Steel Pipe) employs Q235A/B steel for mining applications.
- GB/T14980-1994 (Large Diameter Low Pressure Fluid Transport Electric Welded Steel Pipe) also uses Q235A steel.
These pipes are essential across industries, ensuring efficiency and safety while adhering to stringent quality standards.