1、5 June i987 SUPERSEDING MIL-T-l391SD(MR) 27 April 1976 MILITARY SPECIFICATION TUBES, STEEL, SEAMLESS: FOR CANNONS AND RECOILLESS RIFLES This specification is approved for use within the Department of the Army, and is available for use by all Departments and Agencies of the Department of Defense. 1.
2、SCOPE 1.1 This specification covers seamless, thin-wall, steel tubes in the quenched and tempered condition for use in the manufacture of cannons and recoilless rifles. 2. APPLICABLE DOCUMENTS $ i- 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. The following standards form
3、 a part of this specification to the extent specified herein. otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation. STANDARDS Unless MILITARY
4、 MIL-STD-105 - Sampling Procedure and tables for Inspection by Attributes MIL-STD-109 - Quality Assurance Terms and Definitions (Copies of specifications, standards, handbooks, drawings, publications, and other Government documents required by contractors in connection wih specific acquisition funct
5、ions should be obtained from the contracting activity or as directed by the contracting activity. ) Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Director, US Army Laboratory Command, Material
6、s Technology Laboratory, ATTN: SLCMT-MSE, Watertown, MA 02172-0001 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC NO. A4087 /AREA FORGf DISTRIBUTION STATEMENT A Approved for Public Release; Distributio
7、n Unlimited. I- THIS DOCUMENT CONTAINS ) PAGES. Licensed by Information Handling ServicesMIL-T-13915E 2.2 Other publications. The following document(s) form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted shal
8、l be those listed in the issue of the DODISS specified in the solicitation. specified, the issues of documents not listed in the DODISS shall be the issue of the non-government documents which is current on the date of the solicitation. Unless otherwise AMERICAN SOCIETY FOR TESTING AND MATERIALS (AS
9、TM) ASTM A751 - Chemical Analysis of Steel Products, Standard Methods, ASTM D3951 - Commercial Packaging ASTM E8 - Tension Testing of Metallic Materials ASTM E10 - Brinell Hardness of Metallic Materials, Test for ASTM E23 - Notched Bar Impact Testing of Netallic Materials ASTM E381 - Rating Macroetc
10、hed Steel, Procedure for Practices, and Definitions for (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103. ) AEROSPACE MATERIAL SPECIFICATIONS (SAE) MIS 2301 - Aircraft Quality Steel Cleanliness (Magnetic
11、 Particle Inspection Procedure) (Copies should be obtained from the procuring activity or as direct.ed by the contracting officer. ) (Non-government standards and other publications are normally available from the organizations which prepare or which distribute the documents. documents also may be a
12、vailable in or through libraries or other informational services. These 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein (except for associated detail specifications, specification sheets or MS standards), the text of this spe
13、cification shall take precedence. Nothing in this specification, however, shall supersede applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Chemical composition. Unless otherwise agreed to by the contractor and the Procuring Contracting Officer, the c
14、hemical composition of the steel shall be within the limits proposed by the contractor. 3.2 Processing controls, 3.2.1 Orientation of tube to ingot. The tube shall be made so that its longitudinal axis shall be essentially concident with the longitudinal mis of the ingot. 2 9 4 Licensed by Informati
15、on Handling ServicesNIL-T-L37LSE FO m 7777706 OLL6576 2 = . 3.2.2 Straightening. Tubes may be cold straightened. After cold straightening, tubes shall be stress relieved at a temperature within 100oF below the tempering temperature but no lower than 9000F. 3.2.3 Welding. Tubes shall not be welded ex
16、cept on prolongations. All welds shall be in such a position so as not to affect the finished tube or test metal. r 3.3 Heat treatment. Heat treatment shall be performed on the whole tube, never on a portion only, and shall-at least consist of normalizing, austenitizing, agitated liquid quenching an
17、d tempering. Unless otherwise allowed, the tubes shall be quenched without any obstruction in the bore to permit free passage of the coolant through the bore. quenching and shall consist of heating the entire tube at a temperature not less than 1000oF for yield strength ranges up to 159,999 p.s.i.,
18、nor less than 9000F for yield strength ranges above 159,999 p.s.i. and holding at the temperature for a time appropriate to the thickness. tempering treatment employing different temperatures at opposite ends of the tube (differential tempering) may be used at the option of the contractor. Whenever
19、differential tempering is employed, or whenever tubes are retempered only (see 4.6.7.5), temperatures of 10000F or 9000F minimum are required, as noted above, unless otherwise allowed by the procuring contracting officer. Tempering shall follow A zone controlled 3.4 Mechanical properties. 3.4.1 Yiel
20、d strength. Yield strength shall be as specified on the applicable drawings, or in the contract or order. 3.4.2 Reduction of area. The minimum percent reduction of area for individual specimens shall be as specified in table I. 3.4.3 Charpy V-notch impact resistance. The minimum value for individual
21、 Charpy V-notch impact resistance specimens shall be as specified in table I for the average yield strength. 3.4.4 Hardness. The range of hardness of each tube end not tested for yield strength shall be within + 25 points Brinell of the average hardness of the corresponding ends of all tubes of the
22、same lot that are tested for yield strength. 3.5 Dimensions. Dimensions and dimensional tolerances shall be as specified on the applicable tube drawing. 3.6 Identification marking. Each tube shall carry positive identification through the various processes, so that it is possible to determine the or
23、iginal source of the finished part. end, by metal-die stamping, with the heat and drawing numbers, and the, manufactdurer s identification (supply code, name or registered trademark). Each tube shall be marked on either Licensed by Information Handling ServicesTABLE I. Mechanical properties. Yield s
24、trength Minimum percent Minimum foot-pounds (O. io percent reduction of Charpy V-notch impact offset) psi. area resistance at -400F + 20F - Transv. Long Transv. Long 60,000 - 69,999 70,000 - 79,999 80,000 - 89,999 g0,ooo - 99,000 100,000 - 109,999 110,000 - 119,999 120,000 - 129,999 130,000 139,999
25、40 40 40 40 40 40 40 35 50 50 50 50 50 50 50 45 55 50 45 40 35 35 35 30 85 80 70 60 50 50 45 40 140,000 - 159,999 30 40 160,000 - 180,000 25 35 20 30 15 20 3.7 Soundness. When specified, the soundness of steel to be used in the tubes shall be determined by a macrostructure equal to or better than th
26、e following conditions designated by ASTM E 381. 36 sq. in. and Less over 36 sq. in. S-3, R-2, C-2 S-3, R-3, C-3 3.8 Records. The contractor shall maintain records of the chemical and mechanical properties of each lot of tubes. 3.9 Cleanliness. The steel materlal to be used in fabrication of tubes s
27、hall meet the requirements of AMs 2301. 3.10 Workmanship. *The finish-machined, heat-treated tube shall be free from seams, cracks, flakes, injurious segregation and other defects detrimental to the application of the tube. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless ot
28、herwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performa
29、nce of the inspection . 4 Licensed by Information Handling ServicesMIL-T-13915E FO W 99977Ob OLLb.578 b W MIL-T-13915E requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such in
30、spections are deemed necessary to assure that supplies and services conform to prescribed requirements. 4.1.1 Responsibility for compliance. All items must meet all requirements of sections 3 and 5. become a part of the contractors overall inspection system or quality program. shall not relieve the
31、contractor of the responsibility of assuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Sampling in quality conformance does not authorize submission of known defective material, either indicated or actual, nor does it commi
32、t the Government to acceptance of defective material. The inspection set forth in this specification shall The absence of any inspection requirements in the specification 4.2 Quality Assurance terms and definitions. Quality Assurance terms and definitions used in this specification are in accordance
33、 with MIL-STD-109. 4.2.1 Lot. A lot shall consist of all the tubes of the same size, from the same heat-ee 4.2.3) of steel that are heat treated at the same time in the same batch furnace and quenched at the same time in the same tank or that pass consecutively through a continuous type of heat trea
34、ting process. 4.2.2 Tube. A tube for purposes of inspection and test is defined as the tube, the length of which is shown on the applicable tubing drawing, plus any prolongations as defined in 6.4.3 which are integral parts of the piece as heat treated. 4.2.3 Heat. The heat shall be the original mel
35、t from which the ingots are For remelt processes (electro-slag remelt and vacuum arc remelt) the poured. heat shall be this original heat, and not any of the smaller remelts. 4.3 Quality conformance inspection. Sample sizes for quality conformance inspection shall be as specified in table II. 4.3.1
36、Checktests. Unless otherwise specified, from any lot of tubes found acceptableunder prescribed inspection, the Government may designate any tube as a check tube. Such a tube becomes the property of the Government, and shall be tested at Government expense at a facility to be designated by the Govern
37、ment, and shall be subjected to any or all tests specified herein. the tube fails to comply with the requirements, two additional tubes shall be tested at Government expense. Failure of either of these tubes shall be cause for rejection of the lot. If both tubes comply with all requirements, the lot
38、 shall be accepted. However, it shall be understood that the paragraph titled “Special Reservation for Critical Defects“, of MIL-STD-105, shall apply to the check test procedure. If 4.4 Sampling. 4.4.1 Chemical analysis. At least one sample shall be taken from each heat The chemical analysis shall b
39、e performed in accordance to verify chemistry. with ASTH A751. chemical analysis ( see 6.3). A report shall be prepared detailing the results of the 5 Licensed by Information Handling ServicesMIL-T-13 9153 4.4.2 Tension and impact tests. The number of tubes selected from each lot for tests shall equ
40、al or exceed the sample sizes specified in table II. TABLE II. - Sample size. Lot size Sample size (minimum) 1-15 16-90 91 and over All 16 16 plus at least 10% of lot in excess of 90 a. If all tubes in a lot are not tested, the sample tubes shall include the extremes of the furnace charge locations
41、and the quenching order when the continuous-type of heat treating is employed. For remelts (see 4.2.3) only, the sample size shall be one tube per remelt ingot, or in accordance with table II, whichever provides the maximum testing. b. Two tensile specimens and two Charpy V-notch impact specimens sh
42、all be taken from each sample tube selected in accordance with 4.4.2. shall be taken from alternate tube ends so that at least 50 percent of the sample tubes shall be tested from end number 1 and 50 percent from end number 2 (see 6.4.1 and 6.4.2). tests shall be performed on each sample tube. Specim
43、ens At least two tensile and two Charpy V-notch impact 4.4.3 Hardness tests. Each tube shall be tested for hardness (see 4.6.3). 4.4.4 Macrostructure. When specified, each heat shall be examined for soundness (see 4.6.4). 4.4.5 Cleanliness. Samples shall be taken in accordance with AMs 2301. 4.5 Exa
44、minations. 4.5.1 Visual. All tubes shall be subject to examination for compliance with the Identification Marking (3.6), Workmanship (3.10) and Packaging (Section 5) provisions of this specification. 4.5.2 Dimensional. All tubes shall be subject to examination.for compliance with the dimension and t
45、olerance requirements specified on the applicable tube drawing, contract, or purchase order. 4.6 Tests. 4.6.1 Chemical composition. Tests shall be conducted in accordance with ASTM A751. 4.6.2 Tension and impact. 4.6.2.1 Location of specimens. Two tension and two impact specimens shall be taken from
46、 the locations indicated on the applicable drawing. When no location is shown on the drawing, specimens shall be taken so that the longitudinal center lines of the specimens, at midlength of the specimens, are tangent to a circle of 1/2 inch from the inside surface of the finished tube. Specimens fr
47、om the same end or ends of the tube or tubes shall all be taken in the same direction. 6 Licensed by Information Handling Servicest 4.6.4 Nacrostructure., When specified, discs for macro-examination specimens shall be prepared and evaluated in accordance with ASTM E 381. MIL-T-137L5E FO W 7779706 Ol
48、L65O 4 W MIL-T-13915E a. When the design of the tube precludes the use of transverse specimens, The specimens shall be taken with their longitudinal specimens shall be used. longitudinal center lines approximately parallel to the longitudinal axis of the tube. . b. Test specimens shall be taken from
49、 the 12, 6, 3, and 9 oclock positions consecutively, as may be necessary to obtain sufficient tests. Additional specimens,if required, may be taken from any oclock position provided that each additional specimen shall be taken from a position diametrically opposite the preceding specimen unless a specimen has previously been taken from the location. c. All specimens from quenched and tempered, or requenched and tempered tubes shall be from prolongations of the tubes and from metal at least one wall thickness from the end of the tube. After specimens have been taken in accordance with
