1、i MIL-T-16286E (SI0 19 September 1377 SUPERSEDING MILITARY SPECIFICATION TUBE, STEEL, SEAMLESS, MARINE MIL-T-l6286D(SHIPS 1 February 1973 (See 6.7) BOILER APPLICATION This specification is approved for use by the Naval Sea Systems Command and is available for use by all Departments and Agencies of t
2、he Department of Defense. 1. SCOPE 1.1 Sco e. This specification covers requirements for various classes of seamless 1.2 Classification. Tubes shall be one of the following classes as specified (see steel tubed use as water tubes and superheater tubes in high pressure steam generators. 6.2.1 and 6.5
3、): Class a - Low carbon steel Class c - 18 percent chromium -8 percent nickel austenitic corrosion-resisting steel (stabilized) Class d - Carbon - 1/2 percent molybdenum steel Class e - 2-1/4 percent chromium - 1 percent molybdenum steel Class g - Medium carbon steel 2. APPLICABLE DOCUMENTS 2.1 Issu
4、es of documents. The following documents, of the issue in effect on date of invitationforbiz or request for proposal, form a part of this specification to the extent specified herein. SPECIFICATIONS FEDERAL PPP-B-601 - Boxes, Wood, Cleated-Plywood. PPP-B-621 - Boxes, Wood, Nailed and Lock-Corner. PP
5、P-C-650 - Crates, Wood, Open and Covered. MIL-P-116 - Preservation-Packaging, Methods of. MILITARY STANDARDS FEDERAL FED-CTD-151 - Metals, Test Methods. FED-STD-183 - Continuous Identification Marking of Iron and Steel Products. MIL-CTD-105 - Sampling Procedures and Tables for Inspection by Attribut
6、es. MIL-STD-129 - Marking for Shipment and Storage. MIL-CTD-271 - Nondestructive Testing Requirements for Metals. . MILITARY Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Ship
7、 Engineering Center, SEC 6124, Department of the Navy, Washington, DC 20362 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC 4710 Provided by IHSNot for ResaleNo reproduction or networking permitted witho
8、ut license from IHS-,-,-MIL-T-L628bE 47 9999906 0443865 O * Classes Carbon Manga- Silicon Chromium Molybde- Sulfur Phospho- Nickel (see 1.2) nese num imax) rus (ma%) Percent Percent Percent Percent Percent Percent Percent Percent MIL-T-16286E (SH) (Copies of specifications, standards, drawings, and
9、publicatims required by contractors in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) the extent-ified herein. invitation for bids or request for proposal shall apply. 2.2 Other ublications. The following .doc
10、uments form a part of this specification to Unless otherwise indicated, the issue in effect on date of AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) A262 - Susceptibility to Intergranular Attack in Stainless Steel. E8 - Tension Testing of Metallic Materials. E18 - Rockwell Hardness and Rockwell
11、superficial Hardness of Metallic E213 - Ultrasonic Inspection of Metal Pipe and Tubing for Longitudinal E309 - Eddy-Current Testing of Steel Tubular Products with Magnetic Saturation. E426 - Electromagnetic (Eddy-Current) Testing of Seamless and Welded Tubular Materials. Discontinuities. Products, A
12、ustenitic Stainless Steel and Similar Alloys. (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) NATIONAL CLASSIFICATION BOARD National Motor Freight Classification.Classes and Rules. (Application for copies shoul
13、d be addressed to the ATA Tariff Section,l616 P Street, N.W., Washington, Dc 20036.) UNIFORM CLASSIFICATION COMMITTEE Uniform Freight Classification Ratings, Rules and Regulations. (Application for copies should be addressed to the Uniform Classification Committee Agent, G. F. Earl, Tariff Publicati
14、on Officer, Room 1106, 222 South Riverside Plaza, Chicago, Illinois 60606,) available for reference from libraries. They are also distributed among technical groups and using Federal agencies.) (Technical society and technical association specifications and standards are generally 3. REQUIREMENTS a
15、ci/ d- e g 0.06-0,18 0.27-0.63 0.25 max - - 0.058 0.048 - .O8 max 2.00 rnax .75 max 17.0-20.0 - .O30 .O40 9.0-13.0 .lo-0.20 0.30-0.80 .10-0.50 - 0.44-0.65 .O45 .O45 - .27 max 193 max ,10 min - - .O58 .O48 - .15 max .30-0.60 .50 max 1.90-2.60 .87-1.13 .O30 .O30 - -Chemical composition of class c stai
16、nless steel, grade TP-321 and TP-347 (see 6.5) are identical except for the stabilization elements as specified below: ia) Grade TP-321 shall have a titanium content of not less than five times the carbon content and not more than 0.60 percent. 2 Provided by IHSNot for ResaleNo reproduction or netwo
17、rking permitted without license from IHS-,-,-MIL-T-Lh28bE 47 9777706 0443866 2 Class MIL-T-16286ECCH) (b) Grade TP-347 shall have a niobium (columbium) plus tantalum content of not less than eight times the carbon content and not more than 1.00 percent. seamless tubes conforming to this specificatio
18、n, except as specified herein. 3.2 Manufacture. Tubes shall be made by any process or processes which will produce Yield point Ultimate Elongation in (min) tensile strength 2 inches - 1/ (min) (min) 3.3 Heat treatment. Tubes shall be heat treated following the hot finishing or cold drawing operation
19、. 3.3.1 Class a and d tubes shall be heat treated at a temperature of 1200F or higher. 3.3.2 Class c tubes shall be solution annealed at a minimum of 2000F followed by quenching in water or rapidly cooling by other means. Following the solution anneal, the tubes shall be given a stress relief anneal
20、 for stabilization within the temperature range of 1500F to 1650OF. 3.3.3 Class e tubes shall be full annealed, isothermal annealed, or normalized and tempered. Tempering temperature shall be 1250OF or higher. Normalizing may be accomplished by cooling in air or in a cooling chamber of a controlled
21、atmosphere furnace. 3.3.4 Class g tubes shall be given a subcritical anneal, a full anneal or a normalizing heat treatment after the final drawing process. 3.4 Finish. Tubes shall be free from mill scale. A tight furnace oxide, not to exceed 0.001 inch (maximum), is acceptable Slight surface imperfe
22、ctions may be removed by grinding, provided the wall thickness is not reduced below the minimum specified wall thick- ness and the ground areas are well faired into the remaining portion of the tube. The grinding medium shall be 180 grit or finer. Special precautions shall be taken with class c tube
23、s to insure that the grinding medium has only been used previously on class c tubing rruiterial and contains no foreign metallic particles. 3.5 Mechanical properties. Tubes shall conform to the mechanical propertis specified in table II. TABLE II. Mechanical properties. YWhen no definite yield point
24、 is exhibited, yield strength shall be determined at an extension under load of 0.005 inch per inch gage length or a 0.2 percent offset yield strength shall be used. ZTension test for class a tubes not required. mechanical properties may be assumed for class a tubes: (a) Yield point, minimum, lb/in
25、: 26,000. (b) (c) Elongation in 2 inches, minimum percent: 35. ?/These values apply to full section test specimens and longitudinal strip tests 5/16 inch and thicker. In the case of strip tests of thickness less than 5/16 inch, the minimum elongation shall be determined by the following formulas, as
26、 applicable: (a) Class c: E=56t + 17.50. (b) Classes d, e, and g: E=48t + 15.00. For purposes of design, the following 2 Ultimate tensile strength, minimum, lb/in2: 47 , 000. Where: E = elongation in 2 inches in percent, and t = actual thickness of specimen in inches. 3.5.1 Hardness. Hardness of tub
27、es shall not exceed the maximum hardnesses of table III. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-L628bE 47 9999906 0443867 4 1 i) Classes a C d e 9 Minimum L/ Max i mum No requirement Rockwell B-77 Rockwell 8-70 Rockwell 8-90 Rockwell
28、 B-65 Rockwell B-80 Rockwell B-68 Rockwell 8-85 Rockwell 8-68 Rockwell 8-79 LMinimum requirements provided for information only. 3.5.2 Intergranular corrosion. Class c tuhes shall be free from precipitated 3.6 Dimensional characteristics, which result in intergranular corrosion, Hot finished tubes C
29、old drawn tubes - Wall thickness Outside diameter, inches Outside diameter, inches inches 4 and under Over 4 i-1/2 and under Over 1-1/2 Variation in wall thickness, percent I 0.095 and under Over 40 20 22 Under O O O - - carbides Over 0.095 to 0.150, inclusive Over 0.150 to 0,180, inclusive Over 35
30、35 20 22 Under O O O O Over 33 33 20 22 Under O O O O Size Cold drawn tubes i inches) 0s (inches) I Under (inches) Outside diameter Tolerances 20 28 O I O lover 0.180 I Over 1 28 I Under O LWall thickness readings shall be taken with either pointed or ball type micrometers or by other means of compa
31、rable accuracy. the thickness of existing tight furnace oxide permitted in 3.4. Wall thickness readings shall not include 3.6.2 Length, The length shall be not less than but may be 0.188 inch (3/16 inch) more than that specified (see 6.2.1). 3.6.3 Outside diameter. The outside diameter shall conform
32、 to the sizes specified (see 6.2.l), within the tolerances shown in table V. TABLE V. Outside diameter tolerances. nder 1 ver 1-1/2 to 2 exclusive ver 4 to 7-1/2 inclusive ver 7-1/2 to 9 inclusive 0,004 ,006 .O08 .o10 .o12 .O15 .O15 ,015 O. 004 ,006 . 008 ,010 ,012 .O15 .O25 ,045 4 Provided by IHSNo
33、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-Lb2bE Lt7 777790b 0443b b H Size Hot finished tubes Outside diameter Tolerances - (inches) (inches) Under (inches) 4 and under 1/6 4 1/3 2 Over 4 to 7-1/2 inclusive 1/64 3/64 Over 7-1/2 to 9 inclusive 1/64 1/16 MI
34、L-T-16286E (SHI TABLE V. Outside diameter tolerances. (Continued) ,7 Flaring and flatteninq. 3.7.1 Flarinq. When subjected to the flaring test specified in 4.4.4, the test spec after flaring shall show no tears or ruptures in the test area, the depth of which exceeds 10 percent of the specified mini
35、mum wall thickness. The depth of tears or ruptures shall be verified by 1OX magnification and a calibrated reticle. 3.7.2 Flattenin . When subjected to the flattening test specified in 4.4.5, the specimen after the fisst flattening step shall show no tears or cracks on the inside, outs or end surfac
36、es men de 3.8 Eddy current, hydrostatic pressure, and ultrasonic. 3.8.1 H drostatic Each length of tuhe shall be subjected to a hydrostatic pressure test +.pressure as speci ied in 4.4.6 and shall show no evidence of leaks. subjected to a hydrostatic pressure test, preferably, prior to eddy current
37、or ultrasonic testing. Tubes shall be 3.8.2 Eddy current and ultrasonic. Each length of tube with specified minimum wall thickness of 0.12aandbelow shall be subjected to an eddy current test as specified in 4.4.7. Each length of tube with a specified minimum wall thickness greater than 0.120 inch sh
38、all be subjected to an ultrasonic test as specified in 4.4.7. No tube shall produce a signal equal to or greater than the calibration notch. 3.9 Lot identification number. For each lot of tubes as defined in 4.2.2, the manu- facturer sml assign a lot identification number which shall be marked on th
39、e tubes as specified in 3.10.1. 3.10 Identification markin . Tubes supplied shall be marked on each end or continuously marked for identification in acczrdance with FED-STD-183. 3.10.1 Marking information. Each tube 1 inch and over in outside diameter and over 3 feet in length shall be clearly and l
40、egibly marked by painting or stenciling the following information at intervals not greater than 3 feet: (a) Name, trademark or brand name of the manufacturer. (b) Specification number (MIL-T-16286). (c) Class letter. (d) Outside diameter, wall thickness and length. (e) Contract number. (f) Lot ident
41、ification number (see 3.9). (9) Heat number. (h) Date of manufacture (month/year), numerically, date to be preceeded by letter 9 (e.g. 9-1-77. 3.10.2 Ta s and wire. Tubes less than 1 inch in outside diameter or less than 3 feet Tags and securing wire for tubing shall in length shaking fluid shall no
42、t be harmful to the tube and shall not rub off or smear in normal handling. The fluid shall not be affected by solvents used in subsequent cleaning and preservation operations by the contractor. For class c tubes, the marking fluid shall not contain any harmful metal, or metal salts, such as zinc, l
43、ead or copper which cause corrosive attack on heating. 5 . . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-16286E (SHI 3.11 Workmanship. Tubes shall be of proper dimension with ends cut square, free of burrs, and shall not deviate from straig
44、htness by more than 0.060 inch in 3 feet of length. Tubes shall be free from laminations, scale, and rust. A tight furnace oxide, not to exceed 0.001 inch (maximum), is acceptable. Tube surfaces shall conform to 3.4 and shall not contain defects such as laps, seams, tears, cracks, grooves, scratches
45、, indentations, abrasions or pits with depths equal to, or greater than, 10 percent of the specified minimum wall thickness or which reduce the wall thickness below the specified minimum wall thickness. Where defects are encountered, distribution shall be random so as not to provide a potential circ
46、umferential or longitudinal failure path. shall provide in each tubece 5.2.1) a certificate of compliance (see 4.6). 3.12 Certificate com iiance. For each lot of tubes (see 4.2.21, the manufacturer 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the c
47、ontract, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless di
48、sapproved by the Government. any of the inspections set forth in the specification where such inspections are eemed necessary to assure supplies and services conform to prescribed requirements. The contractor shall provide and maintain an inspection system in accordance with the data ordering docume
49、nts included in the contract or order (see 6.2.2). 4.2 4.2.1 Sample unit. The sample unit shall be that length of tubing drawn from a single 4.2.2 Lot. For purposes of sampling,a lot shall consist of tubes or sample units of The Government reserves the right to perform 4.1.1 Inspection system. Samplinq for guality conformance inspection. billet OK tube hollow. the sam
