1、MI L-S- 810S4A (OS) ri MIL-S-B1OSqA 13 m 7377706 0358377 m - 23 September 1976 SUPERSEDING MIL-S-81054 (Wep) 26 May 1964 /- / L- MILITARY SPECIFICATION STEEL: BARS AND FORGINGS, CHROMIUM-NICKEL-MOLYBDENUM-VANADIUM (FOR TORPEDO MK 46 MOD O) This specifcaticq is approved for use by the Naval Sea Syste
2、ms Command, Department of the Navy, and is available for use by all departments and agencies of the Department of Defense. 1, SCOPE 1.1 Scope, This specification covers chromium-nickel-molybdenum- vanadium steel bars and forgings. 1.2 Classification. 1.2.1 Type. Bars and forgings are of the followin
3、gs types in accord- ance with the methods of manufacturing (see 3.3.1.1) : s Type I - Air-melted steel Type II - Vacuum-melted steel 1.2.2 Grades. Forgings are classified in three grades in accordance with the methods of testing (see 3.3.1.2), 1.2.3 Composition. Bars and forgings are .classified in
4、two composi- tions in accordance with the percentage of sulphur and phosphorus (see 3 I 3.1.3) . 12.4 Condition. Bars and forgings are classified in two conditions in accordance with the methods of annealing (see 3,3.1,4). P Provided by IHSNot for ResaleNo reproduction or networking permitted withou
5、t license from IHS-,-,-MIL-S-L054A 13 m 7779706 03s3O O . MIL-S-81054A(OS) 2, APPLICABLE DOCUMENTS * 2.1 Issues of documents, The following documents of the issues in effect on the date of invitation for bids or request for proposals form a part of this specification to the extent specified herein,
6、event of conflict between this specification and other documents refer- enced herein, the requirements of this specification shall apply. In the ., SPECIFICATIONS Military MIL-1-6868 MI L-C- 16173 MI I,-U- 81055 STANDARDS Inspection Process, Magnetic Particle Corrosion Preventive Compound, Solvent C
7、utback, Co 1 d- App 1 i cat i on Ultrasonic Inspection, Immersion, of Wrought Metals, General Specifications for Federal FED-STD-151 Metals : Test Methods Mi li tary MIL-STD-129 Marking for Shipment and Storage “ (Copies of specifications, standards, drawings, and publications required by contractor
8、s in connection with specific procurement functions should be obtained from the procuring activity or as directed by the con- tracting officer.) *. 2.2 Other publications, The following documents form a part of this specification to the extent specified herein, the issue in effect on the date of inv
9、itation for bids or request for proposals shall apply. tion and other documents referenced herein, the requirements of this specification shall apply. Unless otherwise indicated, In the event of conflict between this specifica- 2 Provided by IHSNot for ResaleNo reproduction or networking permitted w
10、ithout license from IHS-,-,-MIL-S-81054A 13 7777706 0358383 2 MI L-S- 8105 4A-( OS) SPECIFICATIONS Aerospace Material Specification (AMs) AMs 2251 Tolerances - Alloy Steel Bars AMs 2300 Premium Aircraft Qual-ity Steel Cleanliness AMs 2301 Aircraft Quality Steel Cleanliness AMs 2898 Identification, F
11、orgings * the Society of Automotive Engineers, Inc, 400 Commonwealth Drive, Warren- dale, Pa, 15096,) (Copies of Aeorcpace Matecial Specifi.cations may be obtained from American Society for Testing and Materials (ASTM) * ASTM E 9 ASTM E 45 Compression Testing of Metallic Materials at Room Temperatur
12、e Determining the Inclusion Content of Steel I * ASTM E 112 Estimating the Average Grain Size of Metals * ASTM A 255 End-Quench Test for Hardenability of Steel * ASTM E 381 Macroetched Steel, Rating (Application for copies of the ASTM standards by serial designation and title should be made to the A
13、merican Society for Testing and Materials, 1916 Race Street, Philadelphia, Pa, 19103,) 3, REQUIREMENTS 3.1 Preproduction sample. When specified in the contract or order, a preproductibn samde shall be manufactured using the procedure pro- posed for the production lot. The sample shall consist of suf
14、ficient material rom each heat to perform the tests of 4.4 and shall be tested, as specified herein, for the purpose of determining, prior to starting production, that the suppliers production methods are capable of yielding bars and forgings that comply with the technical requirements of the contra
15、ct. production sample shall be at the contractors risk, Any production of steel prior to approval of the pre- 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-L059A L3 W 7999906 0358382 4 W MI L- S- 8 1054A (OS) 3.2 Basic reauirement s. 3.2.1
16、Materials and treatments of materials. Unless otherwise speci- fied in the contract or order, bars and forgings shall be manufactured and treated in accordance with the requirements specified herein. 3.2.2 Gages. The supplier shall Frovide whatever gages are necessary and adequate to assure that the
17、 bars and forgings will meet the requirements specified herein and the dimensions of the applicable. . drawings, 3.3 Physical characteristics, 3.3.1 Material. The bars and forgings shall b fine-grain, elec ric- furnace-grade steel and shall conform to the applicable requirements of this specificatio
18、n, 3.3.1.1 Type. 3.3,1.1,1 Type I, air-melted steel. Type I steel shall be manufac- tured in accordance with industry standards for electric-furnace-grade steel, 3.3.1.1.2 Type II, vacuum-melted steel. Type II steel shall be pro- duced by consumable-electrode, vacuum remelting or by vacuum-induction
19、 melting, Type II steel shall conform to composition A. 3.3.1,2 Grade. Forgings shall be provided in three grades and shall be classified as grade A, B, or C in accordance with the tests to which they have been subjected. The tests for bars and each grade of forgings shall be as specified in table I
20、, 3.3K1.3 Chemical composition. The chemical composition of the steel, as determined by a check analysis of the deliverable product, shall con- form to the requirements of table II. Steel is classified as composition A or B, in accordance with the percentage of sulphur and phosphorus it contains, Pr
21、ovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-BL054A 13 m 77777Ob 0358383 b m MIL-S- 8 1054A (OS) TABLE I. Required tests for each grade of steel, Tests Chemical U1 t r as oni c Magne tic part i cl e Grain flow Impact Grain size Decarburization
22、 Inclusion rating Hardenabi lity Tensi le Macroetch test Grade A X X X X X X X X X X X Forgings Grade B Grade C X X - - - X - - X X Element Percent by weight Carbon Manganes e Silicon Chromium Nickel Molybdenum Van ad i um Sulphur Phosphorous 0.33 - Ob38 Oe60 - 0.85 0.40 - 0.60 Oe65 - 0.90 1.65 - 2.
23、00 0.30 - 0,40 Ob17 - 0,23 0,010 Max. (comp A) 0.025 Max. (comp B) 0.025 Max. (comp A) 0,02C Max, (comp B) Bars X X - - - X X X X X TABLE II. Chemical composition of steel. Product analysis Under min, I Over max. 0 bo2 0.03 0.05 0.03 o .o5 0.02 o ,o2 - - 0.02 0.03 0.03 O ,O5 0.02 0.02 o I005 O, 005
24、o * O05 ob05 - *Sulphur plus phosphorus shall be 0.025 percent maximum. 3.3.1 ,4 Condi ti on . * 3.3.1.4.1 Condition A. Condition A steel shall be annealed to a maximum hardness of Rockwell 241 HB (100 HRB), in accordance with ASTM E 9. 5 Provided by IHSNot for ResaleNo reproduction or networking pe
25、rmitted without license from IHS-,-,-_ MIL-S-LO5YA 13 777770b 0358384 H MIL-S-81054A (OS) 3,3.1,4.2 Gondition B, Conditin B steel shall be normalized and tem- pered to a maximum hardness of 30 HRC (100 HRB). 3.3.1.5 Hardenability, The steel shall be hardenable to a Rockwell IrCtr hardness of 56 maxi
26、mum at 1 inch and 47 maximum at 1-1/2 inches from surface when tested in accordance with method ASTM A 225, using a normal- izing temperature of 1700“ ? 10 F. 3.3.1.6 Grain size. The austenitic grain size shall be predominantly No. 5 or finer. with a single grain as large as No. 3 permissible per AS
27、TM E 112. 3.3.1.7 Decarburization, 3.3.1.7.1 - Bars. Ground, turned, or polished bars shall be free from decarburization on ground, turned, or polished surfaces. Hot-rolled bars shall have decarburization no greater than that specified in table III, TABLE III. Decarburization limits for bar stock. N
28、ominal distance between Maximum depth of oguosite faces (inch) decarburization (inch) Up to 0.375 0.375 to 0,500 0.500 to 0,625 0.625 to 1.000 l,oo to 1.50 1.50 to 2.00 2,OO to 2.50 2,50 to 3.00 over 3,OO to 4,O inclusive 0,010 0.012 0,014 0.017 0.020 0,025 O. 030 0,035 O. 045 1The value specified a
29、s the maximum depth of decarburization is the sum of the complete plus the partial decarburization. 3.3.1.7.2 Forgings. Forgings, all grades, shall have a decarburization of 0,035 inch depth, maximum, This limit shall include partial and com- ple t e de carburi zat i on, 6 Provided by IHSNot for Res
30、aleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-BIOWA 13 m wmob 0358385 T I MIL-S- 81054A (OS) 3.3.1.8 Mechanical properties. After quenching in oil maintained at 25“ F and tempering for 2 hours, minimum, at a 125 k 5 F from 1575“ temperature of 700 F, minimum, the mate
31、rial shall have the following mechanical properties: a, Yield strength (0,2 percent offset) Longitudinal or transverse 190,000 psi, min. b, Ultimate strength, longitudinal or trans vers e 215,000 psi, min, c, Elongation in four diameters (1) For stock 6 inches or less in greatest thickness, longitu-
32、 dinal orientation 10 percent, min. (2) For stock over 6 inches in greatest thickness, trans- vers e o rient at i on 10 percent, min, d. Impact strength (V-not ch) 10 foot -pounds, min, 3.3.1.8.1 Bars shall be capable of meeting: longitudinal tensile strength-215,000 psi, min.; longitudinal yield st
33、rength (0,2% offset)- 190,000 psi, min.; and longitudinal elongation in 2 inches-lo%, based on a forged or rolled 4-inch round heattreated in accordance with 3,3,1,8, 3,3,1,9 Internal defects, When inspected in accordance with table I, internal defects of bars, forgings, and forging stock shall be i
34、n accord- ance with the following requirements, 3.3.1.9.1 Inclusion rating. This rating is based on specimens representing the worst area of inclusions in the deliverable product. The procedure for determining the inclusion ratings shall be performed in accordance with method A, of ASTM E 45. The in
35、clusion rating shall not exceed the average values listed in table IV. 3.3.1.9.2 Ultrasonic indications. Internal defects shall not exceed the criteria established for quality level I indications specified in MIL-S-81055, 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without
36、 license from IHS-,-,-TABLE IV. Inclusion rating. Inclus i on Material type I Material type II Thin series Heavy series Thin series Heavy series ,_ type1 A 2.0 2,O 1.5 1.0 = B 3.0 2.0 1,5 1 .o C 3. O 2.0 1.0 1.0 D 2.0 3.0 2.0 1.5 IASTM E 45. 3.3.1.9.3 Macroetch testing of bars, type I, composition B
37、. Visual examination of deep-acid-etched reforging stock in sizes up to and including 36 square inches shall be equal to or better than S2R1C2; sizes over 36 to and including 100 square inches shall be equal to or better than S2R2C3 of ASTM E 381. bars is required only if the manufacturers inspectio
38、n of the macro- structure at an earlier stage of processing such as forged bars, blooms, or billets has not been accomplished, 1/4 inch thick shall be selected to represent each heat of steel from which material is submitted for acceptance, Macroscopic examination of finished Two or more billet slic
39、es at least 3,3,1,10 Surface defects, The steel shall have no imperfections of a nature or degree that will be detrimental to the stamping, forming, machining, or fabrication of finished parts. 3.3.1.11 Tolerances, Unless otherwise specified, tolerances for bar specified by the applicable engineerin
40、g documents. 3.3.2 Forgings. 3.3.2.1 Process. Unless a specific process is designated, forgings shall be formed by any of the following processes : a. Smith (flat die) b, Hammer die c. Press die d, Hot upset e, Ring roll Provided by IHSNot for ResaleNo reproduction or networking permitted without li
41、cense from IHS-,-,- MIL-S-8L054A 13 9779906 0358387 3 - - MIL-S-81054A(QS 3.3.2.2 Grain flow. Forging stock shall be of such size and dimensions that the work accomplished in farming to finished shape shall result in approximately uniform grain size throughout. employed shall produce an internal gra
42、in flow pattern such that the direc- tion of flow in highly stressed areas shall be essentially parallel to the principal stresses, as specified in applicable engineering documents. The grain flow pattern shall be essentially ree from re-entrant and from sharply folded flow lines. The forging techni
43、ques 3.3.2.3 Welding. Forgings shall not be welded, except as indicated on applicable drawings approved by the procuring activity. 3.3.2.4 Flash. Forging flash shall be removed substantially flush Gouging or penetration below the forging - with the adjacent surfaces, surface shall not be permitted.
44、3.3,2,5 Cleaning. All forgings shall be thoroughly cleaned by tumbling, machining, shot or sand blasting, pickling, or other process approved by the procuring activity, 3.3.2.5.1 Cleanliness, Unless otherwise specified, the steel shall conform to the requirements of the following specifications: a,
45、b, Type II AMs 2300 Type I AMs 2301 on a heat qualification basis * 3.3.3 Identification marking. with the following information as applicable : Each bar or forging shall be identified it, b. Supplier identification c. Supplier heat number d. Type, composition, and condition e, Grade of forgings f.
46、g. Serial number (forgings only). Number and revision letter of this specification Drawing number of machined forging 3.3.3.1 Bars. The identification characters shall not be less than - three-eighths inch in height, shall be applied using a suitable marking fluid, and shall be capable of being remo
47、ved in hot alkaline cleaning solution without rubbing. The characters shall be sufficiently durable to withstand ordinary handling, 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted
48、 without license from IHS-,-,-4,3,1 Preproduction samples, The preproduction samples of steel bars and forgings (specified in the contract or purchase order) shall be manu- factured in accordance with 3.1 and 3,3, and shall be subjected to the tests detailed in 4,4 at an activty designated by the pr
49、ocuring activity. Acceptance of the preproduction sample shall be based on no defects in the sample. 4.3,l.l Chemical analysis, A minimum of one sample for chemical analysis shall be taken from each heat of steel represented in the forgings or bars. Samples shall be taken from any point midway between the surface and center of solid forgings or bar
