High-pressure alloy pipes are mainly used to make high-quality carbon structural steel, alloy structural steel and stainless heat-resistant steel seamless steel pipes for steam boiler pipes of high pressure and above. These boiler pipes are designed to work under high temperature and pressure. Pipes will also undergo oxidation and corrosion under the action of high-temperature flue gas and water vapor. Therefore, steel pipes are required to have high lasting strength, high oxidation resistance, and good structural stability.
The joints of high-pressure alloy pipes after welding have good plasticity and impact toughness. During welding, there is generally no need to preheat, control the interlayer temperature and post-heating. There is no need to use heat treatment to improve the structure after welding. There is no need to take special process measures during the entire welding process. Excellent weldability.
The extrudable size range of high-pressure alloy pipes varies depending on the extrusion method. The maximum outer diameter of the alloy steel pipe extruded by the conventional perforated needle extrusion method is 600~650mm, the minimum inner diameter is 5~15mm, and the minimum wall thickness is 2~5mm.
The normalizing process can eliminate the network cementite of hypereutectoid steel. For hypoeutectoid steel, normalizing can refine the crystal lattice and improve the comprehensive mechanical properties of alloy steel pipes. It is best to use normalizing instead of annealing for parts with low requirements. Relatively economical.
