Thick-walled seamless steel pipes have high hardness, requiring proper techniques for cutting. Below are some commonly used methods for cutting thick-walled seamless steel pipes.
Plasma Cutting:
Plasma cutting is effective for cutting various metals that are challenging to cut with oxygen-based methods, especially non-ferrous metals such as stainless steel, aluminum, copper, titanium, and nickel. Its main advantage is that when cutting thin metals, particularly carbon steel sheets, plasma cutting achieves speeds 5 to 6 times faster than oxygen cutting. It also produces a smooth cut surface, minimal thermal deformation, and a smaller heat-affected zone.
Mechanical Cutting:
Mechanical cutting can be done with either external or internal installation. This method applies the principle of turning tool processing to cut and bevel the pipe mouth. It handles a wide range of thicknesses, produces minimal waste, and avoids high temperatures, which helps preserve the pipe material for welding. Water cutting, using high-pressure pumps and corundum, produces clean cuts but has slower speeds and limited processing thickness.
Oxygen-Acetylene Flame Cutting:
This method adjusts the oxygen and acetylene mixture to create three different flame types: neutral, oxidizing, and carburizing. The appropriate flame type is used depending on the cutting requirements.
Production Line of Seamless Steel Pipes:
New Chain Cooling Bed:
Combining the features of both single-chain and double-chain cooling beds, the cooling bed is divided into an uphill and downhill section. The uphill section is a double-chain system with forward and reverse chains that rotate and move the steel pipes forward. The downhill section uses a single-chain system, where the pipes move due to their weight, rotating and sliding down.
Stepping Rack Cooling Bed:
This type of cooling bed consists of static and moving racks. When the lifting mechanism activates, the moving rack lifts the steel pipe, causing it to roll forward. As the moving rack advances, the steel pipe moves down and rolls again along the fixed rack, completing one cycle of cooling.
Screw Cooling Bed:
This cooling system includes a main transmission device, a screw core, and a spiral line. The steel pipe rests on the fixed cooling stand, and the screw's spiral line drives the pipe forward, enabling it to roll along the stand for cooling.
Single Chain Cooling Bed:
This cooling bed features a climbing structure with a forward transport chain and fixed rails. The chain's claws push the steel pipe forward while the rails support the pipe’s weight, ensuring smooth rotation and even cooling through friction and gravitational force.
Double Chain Cooling Bed:
In this system, both a forward transport chain and a reverse chain are used. The forward chain moves the pipe, while the reverse chain supports the pipe’s weight and induces rotation, allowing uniform cooling as the pipe continuously moves forward.
These methods and cooling processes are essential in producing high-quality thick-walled seamless steel pipes that are widely used across industries.
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