รายละเอียดเอกสาร

This specification deals with normalized and tempered, and quenched and tempered, carbon and alloy steel forged or rolled rings for reduction gears. The grades and classes of steels covered here are: Grade 1, Classes A and B, and Grade 2, Classes C and D, which are carbon steels; and Grade 3, Classes E and F, Grade 4, Classes G, H, I, J, K and L, Grade 5, Classes M and P, and Grade 6, Class T, which are alloy steels. Materials shall be manufactured by melting and forging processes and optional machining, and shall be allowed to cool prior to reheating. Heat treatment shall consist of normalizing and tempering for Grade 1, Classes A and B, and quenching and tempering for all other grades and classes. Heat and product analyses shall be performed wherein specimens shall conform to required chemical composition of carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, vanadium, copper, and aluminum. Steels shall also undergo tension, impact, and Brinell hardness tests, and shall conform to the following mechanical requirements: tensile strength, yield strength, elongation, reduction of area, Brinell hardness, and Charpy V-notch.