Economical low-temperature steel pipe with good corrosion resistance and manufacturing method of economical low-temperature steel pipe
A corrosion-resistant and economical technology, applied in the field of low-temperature steel pipes and their manufacturing, can solve the problems of unexplained low-temperature impact performance at -60°C, unfavorable product performance stability, and a wide range of product element components, and achieve excellent low-temperature impact performance. , Improve low temperature impact performance and acid corrosion resistance, low cost effect
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[0032] Below by embodiment the present invention will be further described.
[0033] According to the composition ratio of the technical proposal, the embodiments of the present invention carry out converter smelting, refining outside the furnace (LF), continuous casting of square billets, cooling to room temperature and then entering into a heating furnace, continuous rolling to obtain tube billets, reheating, rolling to make tubes, fixed diameter, heat treatment.
[0034] The final rolling temperature of the billet continuous rolling is higher than 950°C, the reheating temperature of the billet is 1250-1270°C, and the continuous rolling pipe is produced with a large rolling elongation coefficient, the rolling elongation coefficient is controlled above 6.5, and the sizing temperature is controlled at 855°C ~875°C;
[0035] Then carry out normalizing heat treatment, the normalizing heating temperature is 910 ℃ ~ 930 ℃, and the normalizing holding time is not less than 45 minu...
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