AMS-QQ-S-763 PDF

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It is recommended, therefore, that this specification not be specified for new designs. The Aerospace Materials Division, however, does not recommend these specifications for future use in new designs. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.

SAE invites your written comments and suggestions. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE.

The initial release of this document is intended to replace QQ-SF. Any part numbers established by the original specification remain unchanged. TSB rules provide for a the publication of portions of unrevised government specifications and standards without consensus voting at the SAE Committee level, and b the use of the existing government specification or standard format.

Under Department of Defense policies and procedures, any qualification requirements and associated qualified products lists are mandatory for DOD contracts. Classes and conditions: The material shall be furnished in the classes and conditions shown in Table I.

Flat rolled product up to 10 inches inclusive in width and 0. All cold reduced flat material under 0. Wire: Any size round or shaped cold finished product that is supplied in coils. Forgings: Parts produced by hot mechanical shaping of such products as bars, billets or other semifinished materials, using hammers presses and forging machines.

Shapes: A solid section other than bar or wire, furnished in straight lengths includes structural angles, channels, tees, and zees. Finish: Hot finished conditions A, T, and H only, bar only : Bars in the hot-finished condition can be ordered with one of the following finishes: a. Hot finished, scale not removed excluding spot conditioning b. Pickled or blast cleaned and pickled c. Rough turned round bars only 1. Cold drawn or cold rolled conditions A and B only b. Centerless ground or smooth turned all conditions, round bars only c.

Polished all conditions, round bars only 1. Marking for Domestic Shipment Civilian Agencies. If a specific melting practice is required by the purchaser, it shall be specified on the purchase order see 6. An abrasive wheel shall be used for such grinding and shall be operated at a speed proper to insure that defective areas are cleanly cut out. Grinding shall not be so severe as to change the metallurgical condition of the material.

Cleaning: Unless otherwise specified in the contract or order, structural changes shall be subjected to a final cleaning treatment for the removal of scale, by the use of an appropriate cleaning solution such as nitric or nitric and hydrofluoric acid see 6. Allowances for machining shall be specified see 6.

Heat treatable grades series shall develop the properties specified for the T or H conditions when subjected to thermal treatment in accordance with MIL-H and as specified or recommended by the purchaser. This requirement applies only to the classes specified in this paragraph. The grain flow pattern shall be free from re-entrant and sharply folded flow lines. Magnetic permeability: When low magnetic permeability is specified see 6.

When low magnetic permeability is specified for classes other than , the acceptable magnetic permeability values shall be as specified see 6. These steels shall be considered acceptable when specimens pass the specified test of 4. This requirement applies only to the classes and conditions specified in this paragraph.

When exact lengths are not ordered see 6. The maximum depth of grinding for spot conditioning shall not exceed 10 percent of the thickness of the shape at any point of conditioning.

Forgings: All forgings shall conform to the sizes and shapes as specified see 6. Dimensional tolerances for finished forgings shall be as specified on the applicable drawings. The symbols shall be repeated at intervals not greater than 3 feet. The identifying designator shall be coded as shown in the following example see 6.

Condition designator. Small forgings shipped in bundles, of such size that individual marking is not practical, shall have the above information printed on substantial tags securely affixed to each end of each bundle with a third tag placed inside the bundle near the middle.

AMS pyrometry requirements do not apply to furnaces used only for heat treating material to condition A. The annealing procedure for S and shall be in accordance with the table below, in addition to the requirements set forth in MIL-H Except as otherwise specified, the supplier may utilize his own facilities or any commercial laboratory acceptable to the Government.

The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure that supplies and services conform to prescribed requirements. For the purpose of chemical analysis a lot shall consist of all bars, wire, shapes, and forgings made from the same heat and presented for inspection at the same time. For all other tests, a lot shall consist of all product of the same size, same heat, and produced under the same processing conditions.

For austenitic, ferritic, and martensitic classes in the annealed condition, a lot may consist of product that is heat treated in more than one charge in the same furnace, or in several furnaces, using the same processing parameters see 6. For martensitic stainless steels heat treated to the T or H condition, however, a lot shall consist of product of the same size, same heat, and the same heat treat charge in a batch type furnace, or under the same processing conditions without interruption within 24 hours in a continuous type furnace.

Sampling procedure: Chemical analysis: For the purpose of chemical analysis of 4. When a lot is a portion of a heat previously subjected to chemical analysis and in compliance with the specified composition range, additional analysis sampling is waived. In the event a portion of a lot is not properly identified, an analysis shall be made of each piece or as required by the purchaser.

Macrostructure examination: Samples shall be selected as shown below. In special cases where more than the usual number of macrostructure etch tests are required, the number of such tests shall be as specified in the contract or order see 6. Heats of bottom poured ingots: Samples shall be taken from semi-finished or finished product representing the top and bottom of three ingots. One ingot shall be taken at random from the first usable plate poured, one ingot at random from the usable plate poured nearest to the middle of the heat, and one ingot at random from the usable plate poured.

When a heat consists of two usable plates, two of the sample ingots shall be selected from the second usable plate poured. When a heat consists of a single usable plate, any three ingots at random may be selected. If there are less than three ingots in the heat, samples shall be taken representing the top and bottom of all ingots.

Strand cast heats: Samples shall be taken from semi-finished or finished product having at least a reduction in cross-section from the cast strand, or samples of the as-cast strand similarly reduced, representing the front, middle, and back of both strands when two strands are cast, or of an inside strand and an outside strand when more than two strands are cast.

When a single strand is cast, six samples having at least a reduction from the cast strand, or samples of the cast strand similarly reduced, representing both ends of the first, middle, and last usable cuts blooms of the strand or product shall be taken.

Product qualification: Samples shall be taken at random from not less than 10 percent of the pieces of each lot. A lot shall be all product of one size from one heat in one shipment.

Not less than three nor more than ten samples shall be selected from a lot, except that if the quantity in the lot is three pieces or less, one sample shall be taken from each piece.

Mechanical tests: Sample s from each lot of bars, wire and shapes rolled, extruded or forged and from each lot of forgings, shall be selected for the tests specified in 4. Test specimens shall be taken from the selected pieces as follows: Bars, wire, and shapes: One longitudinal tension test specimen shall be taken from each sample item and tested as specified in 4. One tension test specimen shall be taken from a prolongation on each end of each forging. The test specimens shall be taken midway between the center and outside of the cross section of the forging.

Under pounds: For forgings weighing less than pounds two tension test specimens shall be taken from two sample forgings to represent the lot. One tension test specimen shall be taken from one forging and the remaining tension test specimen from the other forging. Test specimens shall be taken from suitable prolongations of the forgings, as specified by the procuring activity see 6. For each forging weighing less than pounds submitted individually, one tension specimen shall be taken. Multiples: Where forgings are made in multiples from a single forging, that is, forged in one piece and machined apart, individual tests of each forging need not be made, but tests of the large forging shall govern.

The specimens shall be ground and polished all over. Specimens, since they represent annealed material, may be annealed and pickled after machining. Precipitated carbides test: A minimum of one sample shall be selected from each lot for the test specified in 4. Examination: Dimensional and visual surface inspection: All material shall be subject to dimensional and visual surface inspection to determine whether the material conforms to this specification.

Lots containing defective material shall be rejected. Reinspection: Lots rejected on account of dimensional or visual surface defects may be resubmitted for inspection in accordance with 4.

Tests: Chemical analysis: Samples selected in accordance with 4. If any sample fails to conform to Table II, the entire lot shall be rejected. The tensile specimens shall be prepared in accordance with ASTM A , form and dimension as applicable.

No lot will be accepted if the yield strength of any one specimen is below the minimum yield strength shown in Table III. Hardness test: The number of hardness tests shall be sufficient to establish the uniformity of hardness of the material in each lot.

Failure of any sample to meet the requirements of this specification shall be cause for rejection of the lot. Macrostructure test: The specimens for the macrostructure test shall be cut from the ends of the selected sample and shall represent the full cross section bar, billet, wire, shape, or forging. The surfaces of the specimens to be examined shall be prepared for etch testing. The prepared specimens shall first be cleaned and heated in water to the same temperature as the acid etching solution.

Fresh acid shall be used for each lot of specimens. After etching, the specimens shall be washed in running water or steam and any deposit removed by scrubbing.

The dried specimen shall then be dipped in cold concentrated nitric acid, washed in cold water, and dried. If the specimen fails to conform to 3. Intergranular corrosion tests precipitated carbides : Specimens selected as specified in 4. Rejection and retest: Failure of a specimen to meet a test requirement shall be cause for rejection of the lot.

At the discretion of the procuring activity, retest will be permitted see 6. A retest sample of three specimens shall be tested to replace each failed specimen of the original sample. If one of the retest samples fails, the lot shall be rejected with no further retesting permitted.

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