Steel Industry Glossary
- AMS 2750 Pyrometry
- The aerospace standard governing furnace temperature accuracy — surveys, instrument calibration and thermocouple control.
- Delivery Condition
- The heat treatment state material arrives in — annealed, solution treated, aged, or quenched and tempered.
- Heat & Lot Traceability
- The link between a piece of metal and the melt and processing lot it came from, carried by marking and certificate.
- Material Certificate 3.1 vs 3.2
- Who vouches for the test results — an independent department at the manufacturer, or an additional third party.
- NADCAP
- Industry-managed accreditation of aerospace special processes — heat treatment, NDT, materials testing, chemical processing.
- PMI
- Positive material identification — on-the-spot alloy verification against the marking and certificate.
- Short Transverse Direction
- The through-thickness direction of rolled plate, where properties are lowest and most variable.
- Solution Treat and Age
- The two-stage heat treatment that gives precipitation hardening alloys their strength — solutionising, then controlled ageing.
- Stress Corrosion Cracking
- Cracking under sustained tensile stress in a corrosive environment — the reason 7050-T7451 exists.
- Temper Designation
- The suffix after an aluminium alloy number — T3, T351, T651, T7451 — stating how it was worked and aged.