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Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
The flattening test of ERW (Electric Resistance Welded) steel pipe is a quality control test designed to evaluate the pipe's ability to withstand compressive forces without failure. The test is performed to assess the ductility and integrity of the pipe's welded seam and overall structure, ensuring that the pipe can be safely used in various applications where it may be subjected to external pressures or forces.
Key Aspects of the Flattening Test for ERW Steel Pipe:
- Objective:
The primary goal of the flattening test is to check if the pipe can be flattened without showing signs of cracks or deformations that would compromise its performance. The test ensures the pipe's ability to handle compressive stress without failing, especially at the weld area.
- Test Procedure:
A section of the ERW steel pipe, usually around 5-10 times the pipe's diameter, is selected for the test.
The pipe is placed between two parallel platens in a press, and compressive force is applied to flatten the pipe.
The pipe is generally flattened to a specific reduction in diameter (e.g., 75% of the original diameter) or a set distance (e.g., a reduction in height) without cracking or losing its structural integrity.
- Criteria for Acceptance:
No Cracking: The pipe should not exhibit any cracks or fissures along the weld or base metal after flattening.
No Deformation: The pipe should maintain its overall shape without bulging or deformation at the weld seam.
Weld Integrity: The weld area should not fail, as the primary concern in ERW pipes is the strength of the weld joint.
- Standards and Specifications:
The flattening test is commonly specified in various industrial standards, including ASTM A53, ASTM A252, and API 5L for steel pipes, and it may have different requirements based on the grade and intended use of the pipe.
For example, API 5L and ASTM A53 provide specific criteria for the flattening test, including the minimum reduction in diameter and the pressure at which the test should be conducted.
- Test Results and Interpretation:
After the test, the pipe is visually inspected for cracks, deformations, and any other signs of failure. If the pipe passes the flattening test without showing such defects, it is deemed suitable for further use.
If the pipe fails the test (e.g., cracks or unacceptable deformations), it may be rejected, and corrective actions such as modifying the welding process or improving material quality may be considered.
Importance of Flattening Test:
The flattening test ensures that ERW steel pipes are durable and reliable under stress conditions.
It is particularly crucial for applications in the oil and gas industry, construction, and any field where the pipe will be subject to external forces, bending, or compression.
In summary, the flattening test is a straightforward but essential test for verifying the structural integrity of ERW steel pipes, especially around the welded area.
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