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Low elongation results?

Low elongation results?

Low elongation results?

(OP)
What would cause lower elongation results (5 or 6 percentage points) when tensile testing stainless or carbon steel in the form of a .505 or reduced section tensile?  All obvious areas have been checked. (i.e. calibration, specimen preparation etc.) Any ideas would be appreciated.

RE: Low elongation results?

Is it an all weld tensile or  tensile from base metal? what is the conditions of the specimen? is it from a HTed plate? Is the tenile specimen aged? Give some more details. What did the fracture surfaces show? were there fisheyes? any defects? Was the strain rates normal during testing?

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RE: Low elongation results?

The last lab I worked for had a relatively new Instron HRDE (high resolution digital extensometer). We used to pick a sheet of low carbon steel and cut the whole sheet into the standard dogbone. (ASTM E8 2"x.5x(thickness)) Each day we would pull one of these. Yeild and Tensile only varied by about 0.1 ksi. Elongation however varied up to 3%.

Even with a known prime sheet the steel may vary across the width and length of a coil.

5% (unless you're talking about material with really low elongation anyway) doesnt seem to be very much, esp if you're testing the regular forming grades of steel.

Nick

RE: Low elongation results?

As earlier posts have said - need more information on what type of product is being tested.

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