How does the bending wrinkle defect of stainless steel seamless elbow occur?
The main reason for the occurrence of bending wrinkles in stainless steel seamless elbows is the loss of process control.
There are two triggers:
1. Excessive bending angle: The wrinkling rate of a 90 ° bend is 50% higher than that of a 45 ° bend (due to excessive stretching of the outer material during bending).
2. Mold deviation: Expansion fixture tolerance>0.1mm or uneven wall thickness caused by mold wear.
The consequence of causing bending and wrinkling defects is that the fluid resistance at the wrinkling point increases by 30%, leading to eddies and pressure drops (affecting transport efficiency).
What should we do then?
Adopting hot pressing technology (hydraulic pressing at 850~1100 ℃), with a wall thickness uniformity of ± 7%; When the bending angle is greater than 60 °, priority should be given to long radius elbows (with a curvature radius of 1.5D and a resistance reduction of 40% compared to 1.0D).
How does the bending wrinkle defect of stainless steel seamless elbow occur?
The main reason for the occurrence of bending wrinkles in stainless steel seamless elbows is the loss of process control.
There are two triggers:
1. Excessive bending angle: The wrinkling rate of a 90 ° bend is 50% higher than that of a 45 ° bend (due to excessive stretching of the outer material during bending).
2. Mold deviation: Expansion fixture tolerance>0.1mm or uneven wall thickness caused by mold wear.
The consequence of causing bending and wrinkling defects is that the fluid resistance at the wrinkling point increases by 30%, leading to eddies and pressure drops (affecting transport efficiency).
What should we do then?
Adopting hot pressing technology (hydraulic pressing at 850~1100 ℃), with a wall thickness uniformity of ± 7%; When the bending angle is greater than 60 °, priority should be given to long radius elbows (with a curvature radius of 1.5D and a resistance reduction of 40% compared to 1.0D).