| Product Form | Carbon and Low Alloy Steels | Non-Heat Treat- able Alum. Alloys | Heat Treatable Alum. Alloys | Magnesium Alloys | Titanium Alloys | Corrosion and Heat Resistant Alloys | Other Alloys |
|---|---|---|---|---|---|---|---|
| Sheet and Plate | LT | L | LT | L | c | LT | b |
| Bar | L | L | L | L | c | L | b |
| Tubing | L | L | L | L | L | L | b |
| Extrusion | L | L | L | L | c | L | b |
| Die Forging | b | L | L | L | c | b | b |
| Hand Forging | b | LT | LT | LT | c | b | b |
- a Although material specifications may contain mechanical-property requirements for two or three grain directions, the primary test direction indicates the grain direction which is tested regularly.
- b See applicable material specification.
- c Since there is no primary test direction for titanium alloys, mechanical property ratios will be formed using strength values which represent the same grain directions in the numerator and denominator. The design allowable is computed as the product of the reduced ratio and the F, or F value for the grain direction represented by the reduced ratio.
Test specimens must be located within the cross section of the product in accordance with the applicable material specification, or applicable sampling specification, such as AMS 2355, AMS 2370, and AMS 2371 (See list of references at the end of Chapter 9). Subsize tensile and compressive test specimens may be used if necessary. Specimen drawings should be provided along with each data proposal, with English units included. The applicable testing standard should be identified along with the specimen drawings. If the standard is not routinely available in English, an English translation of the standard should be provided.
Test specimens must be excised in longitudinal, long transverse, and short transverse (when applicable) grain directions. Mechanical properties must also be obtained in the 45° grain direction for materials that have significantly different properties in this direction than the standard grain directions. For some product configurations, it may be impractical to obtain transverse bearing specimens. For aluminum die forgings, the longitudinal grain direction is defined as orientations parallel, within ±15°, to the predominate grain flow. The preferred definition for long transverse grain direction is perpendicular, within ±15°, to the longitudinal (predominate) grain direction and parallel, within ±15°, to the parting plane. (Both conditions must be met to satisfy this definition.) The short transverse grain direction is defined as perpendicular, within ±15°, to the longitudinal (predominate) grain direction and perpendicular, within ±15°, to the parting plane. (Both conditions must be met.)