Large-caliber thick-walled seamless pipes produced by the production of manufacturing processes can be divided into cold drawing, cold rolling and hot rolling three basic ways, steel pipe material is 10 #, 20 #, 35 #, 45 # known as ordinary steel pipe, Divided into structural seamless steel tubes according to the purpose; seamless steel tubes for transportation; seamless steel tubes for boilers; high-pressure seamless steel tubes for boilers; high-pressure seamless steel tubes for fertilizer equipment; seamless steel tubes for geological bricks exploration; Seamless steel pipe; seamless steel pipe for oil cracking; seamless steel pipe for shipbuilding; cold-drawn cold-rolled precision seamless steel pipe; Let's take a look at the classification and structure of large-diameter thick-walled seamless pipes .
Large diameter thick-walled seamless steel pipe
The manufacturing process of large-caliber thick-walled seamless steel pipe production can be divided into three basic methods of cold drawing, cold rolling and hot rolling. The material of the steel pipe is 10#, 20#, 35#, 45# as ordinary steel pipe, 16Mn Between the ordinary steel pipe and alloy steel pipe is called low-alloy steel pipe, steel pipe material is 27SiMn, 12Cr1MoV, 10CrMo910, 15CrMo, 35CrMo and stainless steel pipe are collectively referred to as alloy steel pipe. Divided into structural seamless steel tubes according to the purpose; seamless steel tubes for transportation; seamless steel tubes for boilers; high-pressure seamless steel tubes for boilers; high-pressure seamless steel tubes for fertilizer equipment; seamless steel tubes for geological bricks exploration; Seamless steel pipe; seamless steel pipe for oil cracking; seamless steel pipe for shipbuilding; cold-drawn cold-rolled precision seamless steel pipe;
Seamless steel pipe is represented by the method of outer diameter, wall thickness, thick-walled seamless steel pipe is mainly used for mechanical processing, coal, hydraulic steel, and other purposes.
Thick-walled seamless steel pipe classification and structure
classification
Hot-rolled thick-walled seamless steel pipe, cold-rolled thick-walled seamless steel pipe, cold-drawn thick-walled seamless steel pipe, extruded thick-walled seamless steel pipe, pipe jacking
structure
Structural stainless steel seamless pipe (GB/T14975-2002) is a seamless steel pipe used for general structure and mechanical structure. It is widely used in corrosion-resisting pipelines and structural parts in the chemical, petroleum, textile, medical, food, machinery and other industries. And parts made of stainless steel hot rolled (extruded, expanded) and cold drawn (rolled) seamless steel tubes.
Stainless Steel Seamless Pipe for Fluid Conveyance (GB/T14976-2002) is a general seamless steel pipe used to transport fluids such as water, oil, and gas. It is usually hot rolled (extruded, expanded) and cold-drawn (rolled) made of stainless steel. ) Seamless steel tubes.
Shaped seamless steel tubes are the general term for seamless steel tubes of other cross-sectional shapes than circular tubes. According to the different shapes and sizes of steel pipe sections, they can be divided into equal-wall thickness special-shaped seamless steel pipes (code D), unequal wall thickness profiled seamless steel pipes (codenamed BD) and variable-diameter special-shaped seamless steel pipes (coded as BJ). Shaped seamless steel tubes are widely used in various structural parts, tools and mechanical parts. Compared with round tubes, shaped tubes generally have larger moments of inertia and section modulus, and have greater resistance to bending and torsion, which can greatly reduce the structural weight and save steel.
Production Process
General seamless steel pipe production process can be divided into two kinds of cold drawing and hot rolling. The production process of cold rolled seamless steel pipe is generally more complicated than hot rolling. The pipe blank must be firstly rolled by three rollers, and it must be pressed after extrusion. In the sizing test, if the surface does not respond to cracks, the circular tube must be cut by a mower to cut a blank having a length of about one meter. Then enter the annealing process, annealing with acidic liquids for pickling, pickling should pay attention to the surface whether there is a lot of blistering, if there is a large number of blisters generated that the quality of the steel tube does not meet the standard of response. Appearance of cold-rolled seamless steel pipe is shorter than hot-rolled seamless steel pipe, cold-rolled seamless steel pipe wall thickness is generally smaller than the hot-rolled seamless steel pipe, but the surface looks brighter than thick-walled seamless steel pipe, the surface is not too More rough, caliber does not have too many glitches.
The delivery status of hot-rolled seamless steel tubes is generally after hot-rolled and heat-treated. After the hot rolled seamless steel tubes undergo quality inspection, they must be strictly hand-selected by the staff. After the quality inspection, surface oiling is performed, followed by several times of cold drawing experiments, and after the hot rolling treatment, perforation tests are performed. If the perforation expansion is too large, straightening correction is required. After straightening, it is transported by the transmission device to the flaw detection machine to carry out the flaw detection experiment. Finally, it is labeled and placed in the warehouse after specification.
Process flow
Sanitary mirror tube process flow:
Tube Blanks - Inspection - Peeling - Inspection - Heating - Perforation - Pickling - Grinding - Lubrication Air Drying - Welding Head - Cold Drawing - Solution Treatment - Pickling - Pickling Passivation - Inspection - Cold Rolling - Degreasing - Cutting Head - Air Drying - Internal Polishing - External Polishing - Inspection - Marking - Finished Product Packaging
Thick-walled industrial pipe process:
Tube Blanks - Inspection - Peeling - Inspection - Heating - Perforation - Pickling - Mushroom Trimming - Air Drying - Welding Head - Cold Drawing - Solution Treatment - Pickling - Pickling Passivation - Inspection
Commonly used thick-walled seamless steel pipe implementation standards:
1. Seamless steel pipe for structural use is a seamless steel pipe for general structure and mechanical structure.
2. Seamless steel pipe for fluid transportation is a general seamless steel pipe used to transport fluids such as water, oil, and gas.
3. Seamless steel tubes for low and medium pressure boilers are used to produce high quality carbon for superheated steam pipes, boiling water pipes and superheated steam pipes for boilers of various structural low and medium pressure boilers, large smoke pipes, small smoke pipes and arched bricks. Structural steel hot-rolled and cold drawn (rolled) seamless steel tubes.
4. Seamless steel tubes for high-pressure boilers are high-quality carbon steel, alloy steel and stainless steel seamless steel tubes for the heating surface of water-tube boilers used to produce high pressure and above pressure.
5. High-pressure seamless steel tubes for chemical fertilizer equipment are high-quality carbon structural steel and alloy steel seamless tubes suitable for chemical equipment and pipelines with an operating temperature of -40 to 400°C and a working pressure of 10 to 30 Ma.
6. Seamless steel pipe for oil cracking is a seamless steel pipe for furnace pipes, heat exchangers and pipes in petroleum refineries.
7. Steel pipes for geological drilling are steel pipes used by the geological department for core drilling. They can be divided into drill pipes, drill collars, core pipes, casing pipes and sedimentation pipes according to their purposes.
8. The seamless steel pipe drilled with diamond core is a seamless steel pipe used for the drilling of drill cores, core bars and casings of diamond cores.
9. Oil drilling pipe is a seamless steel pipe used for thickening or thickening at both ends of oil drilling. The steel pipe is divided into two types, namely the sub-car wire and the non-car wire, and the wire pipe is connected with the joint. The butt welding method of the wire car pipe is connected with the tool joint.
10. Carbon steel seamless steel tubes for ships (GB5213-85) are carbon steel seamless tubes for the production of Class I pressure piping systems, Class II pressure piping systems, boilers and superheaters for ships. Carbon steel seamless steel pipe wall temperature does not exceed 450 °C, alloy steel seamless pipe wall temperature exceeds 450 °C.
Summary: The relevant information on the classification and structure of large-caliber thick-walled seamless pipes was introduced here. I hope this article will be helpful to everyone. If you still have something you don't understand, you can leave a message to Xiaobian at the bottom. We will answer your questions as soon as possible.
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