X80 grade steel pipe bending technology

X80 grade steel pipe bending and heat treatment process parameters to determine the

 Abstract: To evaluate the bending and heat treatment thermal cycling on the mechanical properties of X80 grade steel, the optimum heating temperature and cooling rate in the bending process and the optimum heat treatment parameters. First, the two steel pipes from different furnace batch industrialized bending and heat treatment tests. Then, the steel pipe specimens for laboratory heat treatment test. Samples were heated to 900 to 1000 ℃, and the different rates of cooling, 500 ℃ for 1h heat treatment. The test results show that heating to 900 ~ 1000 ℃ bending, water quenching and tempering (500 ° C, 1h) get a higher yield strength. However, tests under laboratory conditions to achieve the cooling rate in industrial production more difficult to achieve. For the heat test, when the heat treatment temperature is 600 ~ 650 ℃ for optimal yield strength. Based on laboratory test results, the tempering temperature of 600 ~ 650 ℃ is the best choice of the bending process of induction heating production of X80 elbow.

Author: China National Petroleum Corporation Pipe Institute;

 

【Key words】: X-grade steel pipe bending forming heat treatment process of process parameters yield strength laboratory simulation of the cooling rate of the mechanical properties of heat treatment temperature heat cycle

【Key Words】: TG386.31; TG162

Text snapshot:

Pipeline construction, steel hot or at room temperature bend to suit the local terrain morphology. The small diameter tube bending heat pipe bending technology available to the traditional cold-formed technology can not be achieved to meet the requirements of meandering lines, effective use of space. At the same time, the bend of the application of heat not only reduces the workload of on-site construction earthworks, and reduce the environmental impact. Bending technology is a very important point is how to ensure that the steel

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