Question 1

Is a test certificate from a lab the same as a mill certificate?

Accepted Answer

No. Third-party retests can supplement but may not replace specified mill documentation unless the contract allows.

Question 2

What if the heat number on the tag does not match the MTC?

Accepted Answer

Quarantine the material, notify the supplier immediately, and do not install until resolved.

Question 3

Should small lots skip MTC discipline?

Accepted Answer

Risk scales with consequence. Even small lots on critical welds deserve traceability if the specification demands it.