ASTM A400 PDF

Minimum as-quenched hardness for obtaining desired hardness after tempering at F C or higher. D These steels have insufficient hardenability for Class P-4, because of difference in test locations, but are satisfactory for other smaller sizes. For bars, the location should be at least twice the diameter or minimum distance between faces from an end; and for at sections, at least twice the thickness from an edge. Hardness Criteria for Quenched and Tempered Parts 7.

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You are on page 1of 9 Search inside document Designation: A 69 Reapproved Standard Practice for Steel Bars, Selection Guide, Composition, and Mechanical Properties1 This standard is issued under the fixed designation A ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.

A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. Scope 1. This is not a specification for the procurement of steel. Applicable procurement specifications are listed in Section 5. The criteria for placing a steel composition in one of the three general class designations, Classes P, Q, and R described in Section 4 are as follows: 1.

A hardness indicated by tests made at a location shown in Fig. Normal good shop practices are assumed, with control of austenitizing and tempering temperatures, and mild agitation of the part in the quenching bath. The locations for obtaining tension tests are described in 6.

Steels with lower alloy contents are often satisfactory through the use of special processing techniques. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. Significance and Use 3. If the desired mechanical properties are as set forth in 4. Current edition approved March 1, Published April Originally approved in Last previous edition approved in as A 69 No further reproductions authorized.

NOTE 1Steels listed as approved for a certain section or strength may be used for lighter sections and lower strengths. Those in italics are no longer considered standard grades due to decreased usage.

NOTE 4Steels having a maximum carbon content of 0.

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ASTM - A400

You are on page 1of 9 Search inside document Designation: A 69 Reapproved Standard Practice for Steel Bars, Selection Guide, Composition, and Mechanical Properties1 This standard is issued under the fixed designation A ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense.

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