Bending angle of large diameter thick - walled steel pipe

The bending angle is  90 ° and the bending radius is 8 times the outer diameter. The test shall be filled with no filler, and the specimen shall be placed in the outer or upper part of the bending direction.
After the test, there should be no cracks and cracks on the sample. High-pressure boiler tube is a kind of boiler tube, belonging to the category of seamless steel pipe. The manufacturing method is the same as that of the seamless pipe, but it has strict requirements for the steel used in making the steel pipe.
High- in high temperature  oxidation and corrosion. Large-diameter thick-walled steel pipe is mainly used to manufacture high-pressure and above the pressure of pipe and other high-quality carbon structural steel, alloy structural steel and stainless steel heat-resistant steel pipe,and high pressure Work, so the requirements of steel pipe with high durability, high oxidation resistance, and has good organizational stability.
Stable processes and unstable processes have a significant difference, which is easily observed in production. Cold bending test Nominal diameter of not more than 50mm high pressure boiler steel pipe should be cold bending test. Requiring steel pipe with high durability, high oxidation resistance, and good organizational stability.
High-pressure boiler tubes are mainly used to manufacture high-pressure and ultra-high pressure boiler superheater tube, reheater tube, air pipe, the main steam pipe. Large-diameter thick-walled steel pipe is mainly used to manufacture high-pressure and above the pressure of the steam boiler pipe and other high-quality carbon structural steel, alloy structural steel and stainless steel heat-resistant steel seamless pipe, the boiler tube by high temperature and high pressure work , The tube in the role of high temperature flue gas and water vapor oxidation and corrosion, so the steel pipe has a high lasting strength, high oxidation resistance, and has good organizational stability.