The core issues in quality control of stainless steel seamless elbows
Stainless steel seamless elbows are stainless steel connectors that help pipes turn. They are smooth and seamless, allowing pipes to change direction without disconnecting.
There are three core issues in its quality control: uneven wall thickness, port deformation, and welding defects.
Uneven wall thickness: When the thickness reduction of the back wall of the stainless steel seamless elbow exceeds 12.5% (the upper limit of the national standard), an ultrasonic thickness gauge is required to detect and adjust the push die parameters. In the cold extrusion process, the initial wall thickness error of the pipe should be less than or equal to 5% to prevent local cracking.
Port deformation: Mold wear or heat treatment collision will cause the port ovality to exceed 5%, and the mold core needs to be replaced regularly to optimize the clamping method. The deformation caused by stress release after machining can be eliminated by vibration aging treatment.
Welding defects: The weld of the butt-welded elbow needs 100% radiographic inspection (RT detection) and solution treatment (1050℃ rapid cooling) to prevent intergranular corrosion.
The core issues in quality control of stainless steel seamless elbows
Stainless steel seamless elbows are stainless steel connectors that help pipes turn. They are smooth and seamless, allowing pipes to change direction without disconnecting.
There are three core issues in its quality control: uneven wall thickness, port deformation, and welding defects.
Uneven wall thickness: When the thickness reduction of the back wall of the stainless steel seamless elbow exceeds 12.5% (the upper limit of the national standard), an ultrasonic thickness gauge is required to detect and adjust the push die parameters. In the cold extrusion process, the initial wall thickness error of the pipe should be less than or equal to 5% to prevent local cracking.
Port deformation: Mold wear or heat treatment collision will cause the port ovality to exceed 5%, and the mold core needs to be replaced regularly to optimize the clamping method. The deformation caused by stress release after machining can be eliminated by vibration aging treatment.
Welding defects: The weld of the butt-welded elbow needs 100% radiographic inspection (RT detection) and solution treatment (1050℃ rapid cooling) to prevent intergranular corrosion.