Stainless Steel Verification Standard
Part # AFCTC05S3C
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AASHTO T 336 Specifies the Verification Standard
AASHTO T 336 requires a verification standard composed of essentially linearly elastic, non-corroding, non-oxidizing, nonporous, and nonmagnetic material with a coefficient of thermal expansion that is at least 5 µ-strains /°C different from that of the calibration standard.
The Titanium Calibration Standard
The Titanium calibration standard has a coefficient of thermal expansion of approximately 9.2 µ-strains /°C.
The 304 Stainless Steel Verification Standard
304 Stainless Steel has a coefficient of thermal expansion of about 16.1 µ-strains /°C.
The difference between the coefficients for Titanium and Stainless Steel is 6.9 µ-strains /°C, which meets the requirement of T 336.