Tensile. Hardness.
Microstructure.
Validate properties.
Material testing and validation for incoming material verification. Tensile, hardness, microstructure, chemical analysis. Confirm material per specification.
Key principles.
Yield, UTS, elong
ASTM E8 standard. Verify mechanical properties.
HRC, HRB, HV
Surface hardness verification. ASTM E18 for Rockwell.
Toughness
ASTM E23 impact toughness at specified temperature.
Metallography
Etched cross-section under microscope. Phase verification.
Composition
OES (optical emission spectrometry) for alloy verification.
Through depth
Nitriding, case-hardening depth verification.
ASTM E112
Grain size measurement. Affects mechanical properties.
ASTM E45
Non-metallic inclusion rating. Affects fatigue.
Per heat
EN 10204 3.1 or 3.2 certificates verify mill data.
FAQ
Why test incoming material?
Mill certificates can be wrong or fraudulent. Critical applications verify by independent test. Aerospace required.
Cost of testing?
Tensile test: $100-300. Microstructure: $200-500. Chemical analysis: $150-300. Adds 1-2% to material cost typically.
Test sample quantity?
One test per heat lot typically. ASTM standards specify minimum samples.
Failure analysis?
When parts fail, material testing on broken part. Chemical analysis, microstructure, fracture surface SEM.
Certified labs?
A2LA accredited labs for accepted certifications. ISO 17025 standard for test labs.
Documentation retention?
Aerospace: 30 years. Medical: 25 years (varies by class). Automotive: 15 years. Per industry.
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