ASTM A668 CHEMICAL COMPOSITION PDF

Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. More A This specification deals with the standard requirements for untreated and heat-treated carbon and alloy steel forgings for general industrial use. Materials shall be forged by hot mechanical work. Except for Class A, all forgings shall be heat treated, depending on class, by the following techniques: annealed, or normalized, or normalized and tempered Classes B, C, D, and G ; normalized and tempered, or double-normalized and tempered Class E ; quenched and tempered, or normalized, quenched, and tempered Classes F ; normalized and tempered Class H ; normalized and tempered, or normalized, quenched, and tempered Class J ; and normalized, quenched, and tempered Classes K, L, M, and N.

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ASTM-D e ASTM A ASTM C ASTM A 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. Other ASTM speci? These shall apply only when speci? The values stated in each system are not exactly equivalent; therefore; each system must be used independently of the other.

Combining values from the two systems may result in nonconformance with the speci? Referenced Documents 2. Current edition approved March 1, Published April Originally approved in Last previous edition approved in as A — Terminology 3. Ordering Information and General Requirements 4. Materials and Manufacture 5.

See Section 7. Chemical Composition 6. See Appendix X2. If a standard grade has been used to manufacture the forging the permissible variations in composition of Speci?

If a non-standard grade of steel has been used, and composition limits have not been supplied, the product analysis can be used only to con? Mechanical Properties 7. For untreated forgings Class A weighing less than lb [ kg] each, one test from each heat shall be made.

Shafts and cylinder forgings 80 in. Locations of test specimens for various types of forgings shall be as shown in Fig. However, the test depth shall not be nearer to one heat-treated surface than 3? Sketches showing the exact test locations shall be approved by the purchaser when this method is used. For carbon steel grades not showing a yield point, the yield strength at 0.

For exceptions see 7. The results shall meet the requirements of Table 2. If the purchaser desires Brinell testing of each forging, Supplementary Requirement S11 may be used. If this option is exercised, the class shall be identi? Retreatment 8. Retreatment is de? Multiple retempering is not precluded by this requirement. The tensile properties shall conform to the requirements for the class of forgings ordered Class A. Inspection, Rejection, and Certi? Product Marking Keywords Details of these supplementary requirements shall be agreed upon by the manufacturer and the purchaser.

Chemical Composition S1. Special Forging Techniques S2. Rough Turning and Boring S3. Carbon Content for Welding S4. Bend Tests S5. Magnetic Particle Test S6. Ultrasonic Test S7. Vacuum Treatment S8. Tensile Requirements S9. Heat Treatment S Additional Tests S Additional Marking S Forge Procedure S Rough Forging Sketches A dimensioned sketch or drawing of the proposed rough forging shall be supplied by the producer for approval before the forging is produced.

This drawing or sketch shall indicate also the proposed heat treatment contour, including bores, if any, and the position of the required mechanical test coupons. Grade X2 0. Grade X3 0. Grade X4 0. Grade X5 0. Grade X6 0. Supplementary requirement S13 deleted.

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Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone , fax , or service astm.

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ASTM A668 Class D Normalized, annealed, or normalized and tempered

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Other ASTM specifications for forgings are available for specific applications such as pressure vessels, railroad use, turbine generators, gearing, and others involving special temperature requirements. These shall apply only when specified by the purchaser. The values stated in each system are not exactly equivalent; therefore; each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. Carbon Steel Pipes.

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