Hot Rolled Seamless Steel Tube

Ingot casting can destroy tissue, grain refinement of steel and eliminate defects microstructure, so that the steel dense tissue mechanical properties are improved. This improvement is mainly reflected in the direction along the rolling direction to a certain extent, the steel is no longer isotropic; pouring formed bubbles, cracks and loose, can be welded at a high temperature and pressure. 

1. After hot rolling, the steel inside the non-metallic inclusions (mainly sulphide and oxide, and silicates) is pressed into the sheet, delamination (interlayer) phenomenon. Layered in the thickness direction of the steel tension performance deteriorated significantly, and there may be an interlayer tear weld shrinkage. Weld local strain-induced contraction of the yield point strain often reach several times larger than the load caused by the strain; 

2. Residual stresses caused by uneven cooling. Residual stresses in the absence of external force from the internal equilibrium of stress, both hot-rolled steel section such various residual stress, the greater the cross-sectional size generally of steel, the residual stress is larger. Although the residual stress from equilibrium, but still has some influence on the performance of the steel members under loads. Terms such as deformation, stability, anti-fatigue effects may adversely. 

3. Hot-rolled steel products, poor control of the thickness and width of the edge in this respect. We are familiar with thermal expansion and contraction, since the beginning of the hot rolling out even the length, thickness are standard, and finally cooled or there will be some negative difference, this negative difference edge width wider, thicker the more obvious manifestations. So for large steel for steel edge width, thickness, length, angle, and no law requires very precise edges. 

Round tube perforation → heating → three-roll rolling, rolling or extrusion → detached → sizing (or reducing) → cooling → straightening → hydrostatic test (or testing) → mark → storage

Application areas of hot-rolled seamless tubes and how to choose:

1. Petroleum field: Hot-rolled seamless steel tubes can be used as oil well riser pipes, oil pipes, oil casings and casings, etc. They can withstand greater oil pressure and the high-temperature and high-pressure environment in the oil circuit.
2. Chemical industry: Hot-rolled seamless steel tubes can also be used in chemical pipelines, furnace tubes, containers and storage tanks, etc. Has good corrosion resistance.
3. Aviation and aerospace fields: Hot-rolled seamless steel tubes are commonly used in the aviation and aerospace fields to manufacture components such as engines and tires.
4. Machinery manufacturing field: Hot-rolled seamless steel tubes can also be used as hydraulic pipes, transmission shafts and other components of machines. Due to its high strength, high precision and high pressure resistance, it can effectively improve the working efficiency and service life of machinery and equipment.

Hot-rolled seamless pipes are widely used in oil and gas transportation, chemical industry, aerospace, machinery and equipment manufacturing, building decoration and other fields. When choosing steel pipes, you should choose according to its use environment and characteristics: in areas where higher strength is required, hot-rolled seamless tubes are a good choice. If a higher surface finish is required, you can choose cold-drawn seamless tubes or cold-drawn welded pipes.

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