Forgings, Fasteners, Boltings, Stud Bolts, Screws, Nuts
ASTM A592 specification covers high-strength quenched and tempered low-alloy steel forged parts for pressure vessels. The maximum thickness of forgings under this specification shall be 11⁄2 in. [38 mm] for Grade A, and 4 in. [100 mm] for Grades E and F.
NOTE 1 - These grades are similar to corresponding grades in Specification A517/A517M.
Although no provision is made for supplementary requirements in this standard, the supplementary requirements in Specification A788/A788M may be considered by the purchaser.
Welding technique is of fundamental importance and it is presupposed that welding procedures will be in accordance with approved methods for the class of material used.
| Grade | Composition, % | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Element | |||||||||||||
| C | Mn | P, max | S, max | Si | Ni | Cr | Mo | V | Ti | Zr | Cu | B | |
| ASTM A592 Grade AA | 0.15-0.21 | 0.80-1.10 | 0.025 | 0.025 | 0.40-0.80 | . . . | 0.50-0.80 | 0.18-0.28 | . . . | . . . | 0.05-0.15 | . . . | 0.0025 max |
| ASTM A592 Grade EA | 0.12-0.20 | 0.40-0.70 | 0.025 | 0.025 | 0.20-0.35 | . . . | 1.40-2.00 | 0.40-0.60 | B | 0.04-0.10 | . . . | 0.20-0.40 | 0.0015-0.005 |
| ASTM A592 Grade FA | 0.10-0.20 | 0.60-1.00 | 0.025 | 0.025 | 0.15-0.35 | 0.70-1.00 | 0.40-0.65 | 0.40-0.60 | 0.03-0.08 | . . . | . . . | 0.15-0.50 | 0.002-0.006 |
After forging and before reheating, the forgings shall be cooled to provide substantially complete transformation of austenite. Heat treatment for properties shall consist of heating the forgings to not less than 1650°F [900°C], quenching in a liquid medium, and tempering at 1150°F [620°C] minimum, with a holding time of 1 h/in. [1 h/25 mm] minimum, but in no case less than 1⁄2 h