Cr5Mo heat-resistant steel pipe is usually supplied under annealed condition. The pipe is granular pearlite with a small amount of ferrite structure. The Mo in the steel can improve the mechanical properties of the steel at high temperature, and can also reduce the temper brittleness tendency of the steel. ; of Cr steel improved high temperature oxidation resistance and high-temperature corrosion resistance, corrosion resistance can be produced during petroleum cracking, is widely used in the oil industry the production tube oil medium, heat exchanger, oil cracking tubes, also A reheat steam pipe can be made. In addition, the steel does not undergo high temperature annealing, and the impact toughness decreases sharply after tempering at 500 °C, but tempering at 650~700 °C has no temper brittleness, so it can also be used for corrosion in the thermal cracking process below 800 °C. Pipe, pump components and valves, piston rods, high-pressure hydrogenation equipment parts, etc. Cr5Mo heat-resistant steel is a martensitic steel with an air quenching tendency. When cooled at 1 °C / s, a volume fraction of 0.1% ferrite and 99.9% martensite can be obtained. Therefore, measures should be taken during welding to prevent cracking. If welding with stainless steel welding rods, measures such as pre-weld preheating and post-weld slow cooling should be used. If a heat-resistant steel electrode of the same composition is used, heat treatment should be carried out in addition to preheating before welding and slow cooling after welding.
   In the production, Cr5Mo heat-resistant steel pipe is generally welded by arc welding, and the welding of Cr5Mo steel pipe with thin pipe wall is also often used.
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