ASTM A290-95(1999)

1.1 This specification covers normalized and tempered, and quenched and tempered carbon and alloy steel forged or rolled rings for reduction gears.

1.2 Several classes of steel are covered as follows:

1.2.1 Classes A, B, C, and D are carbon steel.

1.2.2 Classes E, F, G, H, I, J, K, L, M, P, and T are alloy steel.

1.2.3 All classes are considered weldable under proper conditions. Welding techniques are of fundamental importance and it is presupposed that welding procedure and inspection will be in accordance with proper methods for the class of material used.

1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.