ASTM A730 1993 Edition, December 15, 1993
Standard Specification for Forgings, Carbon and Alloy Steel, for Railway Use
Includes all amendments and changes through Reapproval Notice , 1999
Additional Comments: W/D S/S BY ASTM A668/A668M
Published By:ASTM International (ASTM)
1.1 This specification covers eight grades of untreated and heat-treated carbon steel forgings and six grades of heat-treated alloy steel forgings for railway use.
NOTE 1--It is recommended, when semi-finished steel is desired to process these forgings, that the latest issue of ASTM Specification A 711, for Carbon and Alloy Steel Blooms, Billets, and Slabs for Forging, be used. This will enable the forger to select semi-finished material of such chemistry as he desires.
NOTE 2--Railway axles are covered by Specification A 21.
1.2 The grades of carbon steel forgings and the purposes for which they are frequently used are as follows, the choice depending on design and stress or service to be imposed:
1.2.1 Grade A is untreated and is mostly used for drop forgings and parts of minor importance, and those which are to be case hardened.
1.2.2 Grade B is untreated and is used for a general group of miscellaneous ordinary forgings where heat treatment is not deemed necessary.
1.2.3 Grade C is annealed, normalized, or normalized and tempered.
1.2.4 Grade D is annealed, normalized, or normalized and tempered.
1.2.5 Grade E is normalized and tempered.
1.2.6 Grade F is double normalized and tempered.
1.2.7 Grade G is quenched and tempered.
1.2.8 Grade H is normalized, quenched, and tempered.
1.2.9 Grades E, F, G, and H forgings are used in high-duty service on locomotives, cars, and other equipment.
1.3 The grades of alloy steel forgings are as follows:
1.3.1 Grades I, J, and K are normalized and tempered.
1.3.2 Grades L, M, and N are normalized, quenched, and tempered, and are used in heavy-duty service on locomotives, cars, and special equipment.
NOTE 3--The forgings described above were formerly designated as follows:
1.4 Supplementary Requirements (Sections S1 to S5) of an optional nature are provided. These shall apply only when specified by the purchaser.
1.5 The values stated in inch-pound units are to be regarded as the standard.