What Is a Tensile Test — and Why It Matters for Your Flanges
- Fulihua
- Apr 25
- 2 min read
When evaluating flange quality, the numbers on a material certificate are only meaningful if they have been independently verified. That is where tensile testing of flanges comes in — one of the most fundamental mechanical tests required by international standards such as ASME, EN, and JIS.
What is a tensile test?
A tensile test — also known as a tension test — is one of the most fundamental mechanical tests in materials engineering. A standardized sample is cut from the actual material, then placed into a universal testing machine and pulled apart under controlled, increasing force. The machine continuously records the load and elongation until the sample fractures.
From this test, engineers can determine three critical properties:
Tensile strength — the maximum stress the material can withstand before breaking
Yield strength — the point at which the material begins to deform permanently
Elongation — how much the material stretches before failure, indicating ductility
For flanges used in pressure pipelines, these values must meet strict thresholds defined by standards such as ASME B16.5, EN 1092-1, and JIS B2220. A flange that fails to meet these requirements is a safety risk — no matter how good it looks on the surface.
How We Do It at Fulihua
Every batch of material we use goes through in-house tensile testing in our own laboratory — not outsourced, not skipped. Our technicians operate a universal testing machine and verify that each heat of steel meets the mechanical requirements before production continues.
You can see this process in action in the video above.
If you are sourcing flanges for critical applications, this is the standard you should expect from your supplier.
Request a quote or material test report today — sales@flhmetal.com
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