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.

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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. Types correspond to respectiveAISI designations. Except in very small sizes they will harden with ahard case and a soft core. It is controlled for hardenability; the chemical composition isheld to closest limits; and it is subject to rigid tests to ensureuniformity.

Grade A is available with three degrees ofhardenability, namely, shallow hardening, regular hardening,and deep hardening. It is intended for applications that do not requirecontrolled hardenability and where some latitude in uniformityis permissible. Current edition approved Oct. Published December Originallyapproved in Last previous edition approved in as A — 92 DOI: United States Ordering Information4.

Materials and Manufacture5. Itshall be made from ingots that have been reduced in crosssection in such a manner and to such a degree as to ensureproper refinement of the ingot structure. Chemical Composition6. If requested or required, thechemical composition shall be reported to the purchaser or hisrepresentative. The chemical analysis of thedrilling chips shall be made in accordance with the latest issueof Test Methods E The chemical composition thus deter-mined shall not vary from the limits specified in Table 1.

Hardness Properties7. In this case, the specimen shall be a minimum of 3 in. The specimens shall be heat treated asprescribed in Table 3. Rockwell C testsshould be used where possible but light load tests may benecessary on thin specimens.

These tests should be specified byagreement between seller and purchaser. The hardness valueshall be obtained in accordance with the latest issue of TestMethods and Definitions A, and shall be the average of atleast five readings taken in an area midway between the centerand surface of the largest dimension of the cross-sectionalspecimen or along the parallel surfaces of the longitudinalspecimen.

The surface to be tested shall be ground sufficientlyto remove any surface condition, scale, carburization, ordecarburization which might affect readings. The pieces shall be nicked with anabrasive wheel in the center of the length and fractured. The fracture grain size shall bedetermined on the remaining portion of each broken test pieceby comparison of the fracture surface of the hardened case withthe Shepherd Fracture Grain Size Standards.

The fracture grain size is estimated to the nearestquarter number. The hardness penetration and fracture grainsize for GradeAshall meet the requirements shown in Table 3. It shall exhibit a structure free of excessive porosity,segregation, slag, dirt or other nonmetallic inclusions, pipes,checks, cracks, and other injurious defects.

More stringent requirements areavailable by agreement between seller and purchaser. Lower limits of decarburization may be specified byagreement between the seller and purchaser. Permissible Variations for Dimensions NOTE 1—Unmachined tool steel forgings are furnished to size andsurface allowances for machining and tolerances over allowances. Expe-rience indicates that the allowances and tolerances in the tabulation beloware satisfactory for many applications. When width and thickness differ,each dimension carries its individual allowance and tolerance in accor-dance with the tabulation: also, the ID and OD take their respectiveallowances and tolerances.

When forgings are ordered, the purchasershould state whether the sizes are the forged or the finished sizes. Theminimum sizes ordered for forgings should be the finished sizes plusallowances for machining; and the ordered forged sizes are subject toapplicable tolerances Workmanship, Finish, and Appearance For such tests, the inspector shall have the right toindicate the pieces from which samples will be selected.

Otherwise, the seller shall report to the purchaser, or hisrepresentative, the results of the chemical analysis and thephysical and mechanical property tests made in accordancewith this specification. Rejection and Rehearing

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ASTM A686 PDF

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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