Hot-rolled ASTM A210 Gr.A1 seamless steel pipe is relative to cold-drawn (or cold-rolled) seamless steel pipes. Cold-rolled steel pipes are rolled below the crystallization temperature, while hot-rolled ASTM A210 Gr.A1 seamless steel pipe is rolled above the recrystallization temperature.
Hot rolling can destroy the casting structure of the steel billet, refine the grain of the steel, and eliminate the defects of the microstructure, so that the steel structure is dense and the physical and mechanical properties are improved. This improvement is mainly along the rolling direction, so that the ASTM A210 Gr.A1 seamless steel pipe is no longer isotropic to a certain extent; it avoids the bubbles and cracks formed during the casting of the ASTM A210 Gr.A1 seamless steel pipe. And loose, such defects can also be welded under the action of high temperature and pressure.
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