All material is subjected to chemical analysis and mechanical testing to ensure compliance with tables 1 and 2.
Different levels of testing and inspection are automatically triggered by ordering according to table 5, derived from the generic material specification Def Stan 02-835 Part 2. Additional testing can be agreed e.g. Dye Penetrant Inspection of Grade 1 rods and bars, or alternative NDE standards.
Certification provided as standard in both wet-signed and electronic form (soft-copy) in accordance with EN 10204 type 3.1.
3.2 Certification can also be provided upon request.
Notes:
1Material is offered to Grade 1 and Classes 1 & 2 only which is the higher level of mechanical testing and NDE compared with Grade 2 and Class 3.
2For all grades and classes, test samples are integral to the item and the property results are therefore fully representative of the certified material.
3Dye penetrant inspection is included for grade 1 bars (not normally required in generic Def Stan specifications) to ensure freedom defects associated with linear oxide films and inclusions which become revealed as voids during the forging process.
4Eddy current testing has been historically used for evaluating the presence of dangerous linear oxide defects at/near surface, which cannot be detected using radiography, and castings cannot be ultrasonically inspected due to poor grain size and grain structure. Our wrought CNC-1 and CNC-2, due to a very fine grain structure and resulting low attenuation, can be very effectively ultrasonically inspected. This, combined with Dye Penetrant Inspection, can reasonably be expected to locate such defects, due to hot working activities further worsening any such oxides in the original cast ingot. When this is fully confirmed, Eddy Current Testing may not be offered as standard, and this table will be updated accordingly.