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Testing Services

Hardness
Oliver recommends Brinell testing for hardness of steel plate, rather than Rockwell, although we can provide either upon request. A range of 40 points in Brinell hardness or 4 points of Rockwell is required for heat treating to a specified hardness. When hardness is requested in addition to tensile test results, the hardness is for informational purposes only.

Tensile Test
This standardized test for mechanical properties can be done on any steel. Certain grades, such as A36, A572, A516, or A514, are required by specification to have certain mechanical properties and these are reported on the test certificate. C1045, 4140, 4340, and 8620 are chemistry-only grades; they need to be heat treated in order to guarantee tensile test results.

Charpy Impact
This is generally done for products going into cold weather applications but can be done on any steel. Most commonly, A516, A572, and 4340 may require Charpy Impact testing. Usually, thermal treatment in the form of normalizing or quench-and-temper is necessary to ensure specific impact test results.

Ultrasonic Testing
It is often thought that ultrasonic testing (UT) will guarantee internal soundness of a plate by verifying that there are no internal voids or impurities. This is inaccurate. A UT procedure scans the plate using a specified scan or sampling interval, and looks for inconsistencies in internal structure. If the procedure finds no inconsistencies that exceed what is allowed by the UT specification, the plate passes. The choice of UT spec used should be determined by what is acceptable; the tighter the spec, the more expensive the testing and the more expensive the material.

 
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