Low elongation results?

[dlkquality]

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.

 

[sayee1]

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? Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
End of all knowledge is the attainment of immortality!

 

[NickE]

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

 

[Carburize]

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