ASTM A686 PDF

A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the U. Department of Defense. The selection of a material for aparticular application will depend upon design, serviceconditions, and desired properties. The values given in parentheses are providedfor information only. Referenced Documents2.

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A number in parentheses indicates the year of last reapproval. Designation: A — 08 Standard Speci? A superscript epsilon? This standard has been approved for use by agencies of the Department of Defense. Scope 1. The selection of a material for a particular application will depend upon design, service conditions, and desired properties. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

Referenced Documents 2. Current edition approved Oct. Published October Originally approved in Last previous edition approved in as A — 07? The last approved version of this historical standard is referenced on www.

Types correspond to respective AISI designations. These steels offer greater resistance to the softening effect of elevated service temperatures but exhibit a lower degree of toughness. The low carbon Types A8 and A9 have less wear resistance but offer greater toughness than others in this group. Type A7, with high carbon and vanadium, offers exceptional wear resistance but at a very low level of toughness.

The types containing molybdenum may be hardened in air and offer a high degree of dimensional stability in heat treatment. Sizes over about 2 in. The low-carbon types are generally used for structural applications requiring good levels of toughness, while the high-carbon types may be used for short-run tools. Ordering Information 4. Materials and Manufacture 5.

It shall be made from ingots or slabs that have been reduced in cross section in such a manner and to such a degree as to ensure proper re? Chemical Composition 6.

If requested or required, the chemical composition shall be reported to the purchaser or his representative. The chemical analysis of the drilling chips shall be made in accordance with the latest issue of Test Methods E The chemical composition thus determined shall not vary from the limits speci? Hardness Requirements Hardness Requirements 7. If the material form or size does not lend itself to accurate hardness determination on 1? Examples are round bars less than 1? In this case, the specimen shall be a minimum of 3 in.

The specimens shall be heat treated as prescribed in Table 3. Rockwell C tests should be used where possible but light load tests may be necessary on thin specimens.

These tests should be speci? The hardness value shall be obtained in accordance with the latest issue of Test Methods and De? Macrostructure 8. Material supplied to this speci? More stringent requirements are available by agreement between seller and purchaser. Decarburization 9. Nickel T L6 0. T P3. T P4. T P5 0. Unless otherwise speci? C Manganese limit is 1. D Where speci? E Available in several carbon ranges. F Also contains 1. Lower limits of decarburization may be speci? Permissible Variations for Dimensions A6 P3 A7 P4 A8 P5 A9 P6 A10 P20 A P21 A Workmanship, Finish, and Appearance Sampling Inspection The supplier may utilize his own facilities or any other acceptable to the purchaser.

For such tests, the inspector shall have the right to indicate the pieces from which samples will be selected. Otherwise the seller shall report to the purchaser, or his representative, the results of the chemical analysis and the physical and mechanical property tests made in accordance with this speci?

Rejection and Rehearing In case of dissatisfaction with the results of the test, the seller may make claim for a rehearing within that time. Packaging, Loading, and Package Marking Keywords Other combinations of austenitizing and tempering temperatures may be used for particular applications. If samples are austenitized in salt, the sample shall be at the austenitizing temperature for the minimum time shown.

If a controlled atmosphere furnace is used, the sample shall be at the austenitizing temperature for 5 to 15 min 10 to 20 min for D types.

The time at temperature is the time after the sample reaches the austenitizing temperature. This range of time is given because of the difficulty in determining when the sample reaches temperature in some types of controlled atmosphere furnaces. NOTE 4—The P types shall not be tested for response to heat treatment since P2 to P6 are used in the carburized condition and P20 are normally furnished in the prehardened condition. NOTE 5—Specimens as described in 7. A Refer to macroetch photographs in Practice A C High-alloy tool steels include H, D, and A7.

Ordered Size, in. Over 1? B Consult producer for oversize allowance and decarburization limits for all sizes. Free of decarburization. Thickness, in. Measurement is taken on the concave side of the bar with a straightedge. Bars are furnished to the following straightness tolerances: Hot rolled bars: 1? The foregoing formula applies also to bars under 1.

Experience indicates that the allowances and tolerances in the tabulation below are satisfactory for many applications. When width and thickness differ, each dimension carries its individual allowance and tolerance in accordance with the tabulation; also, the ID and OD take their respective allowances and tolerances.

NOTE 2—When forgings are ordered, the purchaser should state whether the sizes are the forged or the? The minimum sizes ordered for forgings should be the? Over 0. Over 1. Over 2. B All tolerances are over the speci? D Additional cleanup for deviations from? Consult with producer. B All tolerances are on the plus side of the speci? Measurement is taken by placing a 5 ft 1. Squareness Tolerances The width and thickness dimensions speci? Closer limits of squareness may be agreed upon between seller and purchaser.

Cut From Plate Oversize Tolerance 0. Details of these supplementary requirements shall be agreed upon by the seller and the purchaser.

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Brashicage W1 tool steel in the annealed condition have very good ductility and can be easily cold worked using conventional methods. Soak, slow cool furnace cool if possible to room temperature. Founded inFuShun covers an area of square meters, annual sales volume of tons. Fushun Special Steel Co. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. Contact Lists General Manager: We have no amendments or corrections for this ast.

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