ASTM A21 Carbon Steel Axles

1. Scope

1.1 This specification covers nonheat-treated axles up to and including those 61⁄2 in. (165.1 mm) nominal diameter at the center and heat-treated axles of all sizes for freight cars, passenger cars, and locomotives.

1.2 This specification is for axles with machined bodies. For axles with as-forged bodies, see Specification A 383.

1.3 The grades of carbon steel axles are as follows:

1.3.1 Grade U—Nonheat-treated.

1.3.2 Grade F—Double normalized and tempered. (All freight axles over 61⁄2 in. (165.1 mm) nominal diameter at the center shall be Grade F.)

1.3.3 Grade G—Quenched and tempered.

1.3.4 Grade H—Normalized, quenched, and tempered.

1.3.5 Grades F, G, and H axles are used in heavy-duty service on locomotives, cars, and other equipment.

1.4 Typical designs for plain and roller bearing axles are shown in the Manual of Standards and Recommended Practice of the Association of American Railroads.

1.5 Supplementary requirements are provided for use when additional testing or inspection is desired. These shall apply only when specified individually by the purchaser in the order.

1.6 The values stated in inch-pound units are to be regarded as the standard.

2. Referenced Documents

2.1 ASTM Standards:

A 370 Test Methods and Definitions for Mechanical Testing of Steel Products

A 383 Specification for Axles, Railway, Carbon Steel, Untreated for Export and General Industrial Use4

E 112 Test Methods for Determining Average Grain Size5

E 127 Practice for Fabricating and Checking Aluminum Alloy Ultrasonic Standard Reference Blocks

E 381 Method of Macroetch Testing Steel Bars, Billets,Blooms, and Forgings

2.2 Military Standards:

MIL-STD-129 Marking for Shipment and Storage7

MIL-STD-163 Steel Mill Products, Preparation for Shipment and Storage

2.3 Federal Standard:

Fed. Std. No. 123 Marking for Shipments (Civil Agencies)

3. Ordering Information

3.1 The inquiry, order, or contract for material under this specification shall include the following information:

3.1.1 Quantity (number of pieces),

3.1.2 ASTM designation and year of issue,

3.1.3 Grade,

3.1.4 Design and size,

3.1.5 Intended service, and

3.1.6 Supplementary requirements (if any)...

Mã tiêu chuẩn:	ASTM A21
Nhóm tiêu chuẩn:	ASTM A21
Tên văn bản(Tiếng Việt)	Standard specification Carbon Steel Axles, Non-Heat-Treated and Heat-Treated, for Railway Use
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