Seamless steel pipe DN219*6 represents a seamless steel pipe with a nominal diameter of 219mm and a wall thickness of 6mm. DN stands for nominal diameter, nominal diameter, also known as average outer diameter. Refers to the standardized diameter series of containers, pipes, and accessories. The use of nominal diameters is conducive to the standardization of parts, and also facilitates design, manufacturing, repair, and management, and reduces manufacturing costs. For pipes, represented by a dimension that is less than the outer diameter and greater than the inner diameter. Corresponding to a certain nominal diameter of the pipe, its outer diameter is a certain value, and its inner diameter changes with the wall thickness.
Common seamless steel pipes
1. A structural seamless steel pipe (GB/T8162-2008) is a seamless steel pipe used for general structures and mechanical structures.
2. Seamless steel pipes for fluid transportation (GB/T12771-2008) are general seamless steel pipes used to transport fluids such as water, oil, and gas.
3. Seamless steel pipes for low and medium-pressure boilers (GB/T3087-2008) are used to manufacture superheated steam pipes, boiling water pipes for low and medium-pressure boilers of various structures, and superheated steam pipes, large smoke pipes, small smoke pipes and other materials for locomotive boilers. High-quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless steel pipes for arch brick pipes.
4. Seamless steel pipes for high-pressure boilers (GB5310-2008) are high-quality carbon steel, alloy steel, and stainless heat-resistant steel seamless steel pipes used for the heating surfaces of water tube boilers with high pressures and above.
5. High-pressure seamless steel pipes for fertilizer equipment (GB6479-2000) are high-quality carbon structural steel and alloy steel seamless steel pipes suitable for chemical equipment and pipelines with working temperatures of -40~400℃ and working pressures of 10~30Ma.
6. Seamless steel pipes for petroleum cracking (GB9948-2006) are seamless steel pipes suitable for furnace tubes, heat exchangers, and pipelines in petroleum refineries.
7. Steel pipes for geological drilling (YB235-70) are steel pipes used by geological departments for core drilling. They can be divided into drill pipes, drill collars, core pipes, casings, and sedimentation pipes according to their uses.
8. Seamless steel pipe for diamond core drilling (GB/T3423-82) is a seamless steel pipe used for drill pipe, core rod, and casing for diamond core drilling.
9. An oil drilling pipe (YB528-65) is a seamless steel pipe with internal or external thickening at both ends used for oil drilling. There are two types of steel pipes: wired and unthreaded. Threaded pipes are connected with joints, while non-threaded pipes are connected with tool joints by butt welding.
10. Carbon steel seamless steel pipes for ships (GB5312-2009) are carbon steel seamless steel pipes used in manufacturing ships’ Class I pressure-resistant piping systems, Class II pressure-resistant piping systems, boilers, and superheaters. The working temperature of the carbon steel seamless steel pipe wall does not exceed 450°C, and the working temperature of the alloy steel seamless steel pipe wall exceeds 450°C.
11. Seamless steel pipe for automobile half-shaft casing (GB3088-82) is a high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe used for manufacturing automobile half-shaft casings and drive axle housing shaft tubes.
12. High-pressure oil pipe for diesel engines (GB3093-2002) is a cold-drawn seamless steel pipe used to manufacture high-pressure pipes for diesel engine injection systems.
13. Precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders (GB8713-88) is a cold-drawn or cold-rolled precision seamless steel pipe with a precise inner diameter for manufacturing hydraulic and pneumatic cylinders.
Post time: Dec-14-2023