1、INCHPOUNDMILT8504B 25 July 1991SUPERSEDING MILT8504A 22 September 1966MILITARY SPECIFICATIONTUBING, STEEL, CORROSIONRESISTANT (304), AEROSPACE VEHICLEHYDRAULIC SYSTEMS, ANNEALED, SEAMLESS AND WELDEDThis specification is approved for use by all Departments and Agencies of theDepartment of Defense.1.
2、SCOPE1.1 Scope. This specification covers requirements for specialquality, seamless andwelded corrosionresistant steel tubing in the annealed condition (see 6.1).1.2 Classification. The tubing shall be of the following types, as specified (see 6.2):a. Type I Seamlessb. Type II Welded and drawnNOTE:
3、Either type I or II may be supplied, unless a specific type is ordered.2. APPLICABLE DOCUMENTS2.1 Government documents2.1.1 Specifications and standards. The following specifications and standards form apart of this specification to the extent specified herein. Unless otherwise specified theissues o
4、f these documents shall be those listed in the issue of the Department ofDefense Index of Specifications and Standards (DODISS) and supplement thereto,cited in the solicitation. (see 6.2)SPECIFICATIONFEDERALQQP35 Passivation Treatments for Austenitic, Ferritic, and Martensitic CorrosionResisting Ste
5、elBeneficial comments (recommendations, additions, deletions) and any pertinent datawhich may be of use in improving this document should be addressed to:ASD/ENESWrightPatterson AFB OH 454336503, by using the selfaddressedStandardization Document Improvement Proposal (DD Form 1426) appearing at thee
6、nd of this document or by letter.AMSC N/A FSC 4710DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILT8504B2STANDARDFEDERALFEDSTD151 Metals; Test MethodsFEDSTD183 Contin
7、uous Identification Marking of Iron and Steel ProductsMILITARYMILSTD163 Steel Mill Products, Preparation for Shipment and StorageMILSTD753 CorrosionResistant Steel Parts; Sampling, Inspection and Testing for Surface PassivationAND10104 Tubing, Steel, CorrosionResistant, Round, Standard Dimensions fo
8、rMS33584 Tubing End Standard Dimensions for Flared(Unless otherwise indicated, copies of federal and military specifications, standards,and handbooks are available from the Standardization Documents Order Desk, Bldg4D, 700 Robbins Avenue, Philadelphia, PA 191115094.)2.2 NonGovernment publications. T
9、he following document(s) form a part of thisdocument to the extent specified herein. Unless otherwise specified, the issues of thedocuments which are DOD adopted are those listed in the issue of the DODISSspecified in the solicitation. Unless otherwise specified, the issues of documents notlisted in
10、 the DODISS are the issues of the documents cited in the solicitation (see 6.2).AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)ASTM A 262 Steels, Austenitic Stainless, DetectingSusceptibility to Intergranular Attack inASTM E 112 Estimating the Average Grain Size of Metals(Application for copies sh
11、ould be addressed to ASTM, 1916 Race Street, PhiladelphiaPA 19103.)AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)ANSI B 46.1 Surface Texture (Surface Roughness, Waviness, and Lay)(Application for copies should be addressed to ANSI, 1430 Broadway, New York, NY10018.)(NonGovernment standards and other p
12、ublications are normally available from theorganizations that prepare or distribute the documents. These documents also may beavailable in or through libraries or other informational services.)2.3 Order of precedence. In the event of a conflict between the text of this documentand the references cit
13、ed herein, the text of this document takes precedence. Nothing inthis document, however, supersedes applicable laws and regulation unless a specificexemption has been obtained.3. REQUIREMENTS3.1 Materials. Heating of material shall be accomplished in air or protective atmospherewhich will provide a
14、smooth gray surface free from carburization, nitriding, or otherdeleterious surface effects.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILT8504B33.1.1 Chemical composition. The chemical composition shall be as specified in table I.TABLE I. Chemi
15、cal composition of the tubing.Element Limits Check analysis tolerance 1/(percent) (under min. or over max.)Carbon 0.08 (max) 0.01 Manganese 2.00 (max) 0.04Phosphorus 0.04 (max) 0.005Sulfur 0.030 (max) 0.005Silicon 1.00 (max) 0.05Chromium 18.00 20.00 0.20 0.20Nickel 8.00 12.00 0.10 0.15Molybdenum 0.5
16、0 (max) 0.03Copper 0.75 (max) 0.031/ Individual determination may vary from the specified range to the extentshown in the check analysis column, except that elements in any heat shallnot vary both above and below the specified range.3.1.2 Grain size. The grain size of the steel in the asreceived con
17、dition shall bepredominantly no. 5 or finer, in accordance with ASTM E 112.3.2 Mechanical properties. The mechanical properties shall be as specified in table II.TABLE II. Mechanical properties of tubing.Elongation Nominal Nominal wall Ultimate tensile Yield strength in 2 inchesoutside thickness str
18、ength (psi) 0.2 percent (min) percentdiameter (inch) offset (min) (inch) (psi) Full section strip0.187 and 0.016 and less 115,000 (max) 30,000 35 35lessOver 0.016 75,000 100,000 30,000 40 35Over 0.187 0.012 and less 110,000 (max) 30,000 37 37to 0.500,incl.Over 0.012 75,000 100,000 30,000 40 35Over 0
19、.500 All 75,000 100,000 30,000 40 35Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILT8504B43.3 Performance3.3.1 Flarability. Tubing 0.125 inch outside diameter, and over, shall flare to therespective dimensions of MS33584, when tested as specified
20、 in 4.3.6. The flared zonesshall be uniform and smooth, and capable of forming pressuretight joints with standardfittings.3.3.2 Flattening. Tubing shall not develop cracks, tears, or other flaws when subjectedto the flattening test specified in 4.3.7.3.3.3 Bending. Tubing shall not develop cracks te
21、ars, breaks, or other flaws whensubjected to the bending test specified in 4.3.8.3.4 Corrosion resistance3.4.1 Resistance to acidified coppersulfate solution. The tubing shall exhibit noevidence of cracks due to intergranular attack when subjected to the examination afterexposure to boiling acidifie
22、d coppersulfate solution at the conditions specified inmethod E of ASTM A 262 and 4.3.9.3.4.2 Passivation treatment. Treatment of inner and outer surfaces by other thanpicking shall be followed by a passivation treatment in accordance with QQP35. Thesurfaces shall be passive to tests as specified in
23、 4.3.10.3.5 Surface conditions. Surface shall be smooth, have a grey metallic appearance andbe free from surface films, scale, flakes, or loose or adherent particles of foreign matter.All chemical bath residues shall have been removed by rinsing in flowing water,followed by thorough drying. Complian
24、ce shall be determined as specified in 4.3.2.3. 3.5.1 Surface roughness. Surface roughness shall not exceed an arithmetical averageroughness height rating (RHR) of 70 on inside surfaces or RHR 40 on outside surfaces,as defined by ANSI B 46.1. The maximum depth of individual surface discontinuitiessh
25、all not exceed the limits of table III. TABLE III. Limits of depth of discontinuities.Nominal wall thickness Maximum permissible depth of(inch) discontinuities(inch)0.020 and under 10 percent of nominal wall thickness0.021 through 0.030 0.0020.031 through 0.040 0.00250.041 through 0.050 0.0030.051 t
26、hrough 0.066 0.0040.067 through 0.085 0.0063.5.2 Discontinuities. Discontinuities of equal or less depth in the outer surfaces oftubes shall be removed by light belt polishing or buffing; except that discontinuitieshaving large root radii plainly visible to the unaided eye, whose surfaces blend smoo
27、thlyinto the normal tube surface, need not be removed. Passivation treatment shall followany surface polishing or buffing operation. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILT8504B53.6 Hydrostatic pressure resistance. When subjected to an i
28、nternal pressure P or15,000 pounds per square inch (psi), whichever is less, tubing shall show no bulging,leakage, or other defects, except that a diametric permanent set to 0.002 inch per inchof diameter is acceptable. Hydrostatic test pressure shall be calculated according to thefollowing formula:
29、P = S (D2 d2) (D2+ d2)Where: P = test pressure in psi.S = specified minimum tensile yield strength, psi.D = maximum permissible outside diameter (nominal OD plustolerance), inchd = maximum permissible inside diameter (computed as D less twicethe minimum permissible wall thickness), inch.3.7 Dimensio
30、ns and tolerances3.7.1 Dimensions. Tubing shall be furnished in the standard diameters and wallthickness specified in AND10104, as specified by the contract or purchase order. (see6.2).3.7.2 Tolerances. The outside diameter shall not vary from the nominal dimensions bymore than the permissible limit
31、s of table IV. Wall thickness variations shall not exceed+10 percent of the nominal wall thickness.TABLE IV. Outside diameter toleranceSize range, outside diameter Tolerance (inch) (inch)to 0.187 exclusive +0.003 0.0000.187 to 0.500 exclusive +0.004 0.000 0.500 to 1.500 exclusive +0.005 0.000 1.500
32、to 2.500 exclusive +0.010 0.000 2.500 to 3.000 exclusive +0.010 0.010 Over 3.000 thru 5.000 +0.015 0.0153.8 Weld bead. When tubing is fabricated by welding, it shall be so processed as toremove the bead or any dimensional indication of the presence of the weld.3.9 Straightness. In no portion of any
33、piece of tubing shall the departure fromstraightness exceed 0.060 inch in a length of 3 feet.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILT8504B63.10 Length3.10.1 Exact lengths. Tubing of all sizes may be ordered to exact lengths or in lengthse
34、xpressed as a multiple of a definite unit, with tolerances as specified in the contract orpurchase order (see 6.2). 3.10.2 Mill lengths. When exact or multiple lengths are not specified (see 6.2) tubing willbe accepted in mill lengths of 5 to 20 feet, but not more than 10 percent of any ordershall b
35、e furnished in lengths shorter than 12 feet.3.11 Identification of product. Tubing shall be marked in accordance withFEDSTD183. The following additional marking items shall be included:MILT8504B Nominal outside diameter Nominal wall thickness3.11.1 Marking of tubing less than 14 inch outside diamete
36、r. In lieu of continuousmarking, tubing less than 14 inch outside diameter may be bundled and each bundleidentified by metal tags, impression stamped with the legend specified inFEDSTD183 and 3.11, and securely attached near each end of the bundle.3.12 Workmanship. Surfaces shall be free from discon
37、tinuities, such as; seams, tears,laminations, pits, or other injurious defects of depth in excess of the limits as specifiedin table III. Centerless grinding and grit blasting of outer and inner surfaces shall not beacceptable. Light belt polishing or buffing shall be permissible.4. QUALITY ASSURANC
38、E PROVISIONS4.1 Responsibility for inspection. Unless otherwise specified in the contract orpurchase order, the contractor is responsible for the performance of all inspectionrequirements (examinations and tests) as specified herein. Except as otherwisespecified in the contract or purchase order, th
39、e contractor may use their own or anyother facilities suitable for the performance of the inspection requirements specifiedherein, unless disapproved by the Government. The Government reserves the right toperform any of the inspections set forth in the specification where such inspections aredeemed
40、necessary to ensure that the supplies and services conform to prescribedrequirements.4.1.1 Responsibility for compliance. All items must meet all requirements of sections 3and 5. The inspection set forth in this specification shall become a part of thecontractors overall inspection system or quality
41、 program. The absence of anyinspection requirements in the specification shall not relieve the contractor of theresponsibility of ensuring that all products or supplies submitted to the Government foracceptance comply with all requirements of the contract. Sampling inspection, as part ofmanufacturin
42、g operations, is an acceptable practice to ascertain conformance torequirements; however, this does not authorize submission of known defective material,either indicated or actual, nor does it commit the Government to accept defectivematerial.4.2 Classification of inspections. The inspection require
43、ments specified herein areclassified as quality conformance inspections (see 4.3).Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILT8504B74.3 Quality conformance inspection. Quality conformance inspection shall consist ofsampling plans A through J
44、specified herein. Samples shall be labeled completely withinformation identifying the purpose of the sample, name of product, specificationnumber, lot number, date of sampling and contract number.4.3.1 Inspection4.3.1.1 Inspection lot. A lot shall consist of one size and wall thickness from one heat
45、 ofsteel, and annealed in the same charge (batch anneal) or all tubing of the same sizeand heat annealed at the same temperature, time and atmosphere, without interruption,in a continuous furnace.4.3.2 Surface condition4.3.2.1 Conditioning of surface. A 1foot section shall be selected from each lot
46、oftubing and split lengthwise. Onehalf shall be immersed in an aqueous solution of 15percent nitric acid and 3 percent hydrofluoric acid by volume at 100F to 120F for 15minutes. After immersion, the specimen shall be washed and dried. The two halvesshall then be compared as to the appearance of inne
47、r and outer surfaces. Difference incolor and appearance, other than minor changes in shade and texture, shall be causefor rejection. 4.3.2.2 Loose material. Wads of firmly compacted clean white cloth or fibrous materialshall be forced through the bore of each of two sample tubes selected from each l
48、ot,and any soiled areas examined at 10 x magnification for the presence of grit, metallicflakes, or other detrimental materials. The presence of such particles shall be cause forrejection.4.3.2.3 Surface roughness. A 1foot section shall be selected from each lot of tubingand split lengthwise. The inner and outer surfaces of both halves shall be examined forsurface waviness and lay in accordance wi
