1、MIL-C-24633A 40 = 7777906 0423466 7 (INCH-POUNDI MIL-C-24633A 74 April IqqO SUPERSEDING 10 April 1984 (See 6.7) MIL-C-24633 MILITARY SPECIFICATION CHAIN, STUD LINK, ANCHOR, LOW ALLOY STEEL, FLASH BUTT WELDED This specification is approved for use by all Departments and Agencies of the Department of
2、Defense. 1. SCOPE 1.1 ScoDe. This specification covers 3/4-inch through 4-3/4 inch, low alloy steel, flash butt welded, stud link anchor chain for use on ships. 1.2 Length. Chain shall be furnished as single shots, nominally 90 feet (15 fathoms) long (see 3.11). 2. APPLICABLE DOCUMENTS 2.1 Governmen
3、t documents. 2.1.1 SDecifications, standards. and handbooks. The following specifica- tions, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Inde
4、x of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA
5、5523, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 40 C DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlirniced. Pr
6、ovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-24633A SPECIFICATXONS MI LZTARY MIL-P-24380 f Paine, Anchor Chain, Solvent Type, Gloss Black. (Metric) STANDARDS MILITARY MIL-STD-271 - Requirements for Nondestruceive Teseing Methods. (Unless other
7、wise indicated, copias of federal and military cpeciEications, standards, and handbooks are available from the Standardization Documents Order Desk, Bldg. 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.) ochar Government documents, dzawings, and publications form il paz of this dosaunont to the
8、 extent speciEied herein. ara those cited in ths solicitation. 2.1.2 ther Government= documents, drawinns. and ublica tio The fhllowing Unless otherwise specified, the issues NAVAL SEA SYSTEMS COMMAND (NAVSEA) NAVSHIPS 0900-003-8000 - Metals, Surface fnspection Acceptance Standards. (Application for
9、 copies should be addressed Co ehe StandaxdizaEiorr Docmpnts Order Desk, Bldg. 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.) 2.2 on-GovernmenE.DublicReionc. The ol.lowng docwnent(s) form a part: o this decwnant to the extene speciPied herein. issues of tho documents which are DOD adopted are
10、 those listed in the issue of Ehe DQDISS cited in the solicitation. deeumanCs not lieitad in Ehe DODISS are the issues o the documents cited in the solicitation (see 6.2). Unless atherwise specified, the Unless atherniae speciied, the issues of AMERICAN SOCIETY FOR TECTXNG AND MATERIALS (ASTM) A 370
11、 - Standard Test Methods and DePinitons or Mechanical Testing of Steel Products. E 112 - Standard Test: Methods for DatermIning Average Grain Size. (DoD adopted) E 381 - Standard Method of Macroetch Testing, Inspection, and Rating Steel Products, Comprising Bars, BilleCs, Blooms, and Forgings. (DaD
12、adopted) (Don adopted) (Application for copies should be addressed 60 the American Sociecy for Tasting and Materials, 1916 Race Street, Philadelphia, PA 19103.) AMERICAN WELDXNG SOCIETY (AWS) AS.1 AS.5 A5.20 - Specification for Carbon Steel Electrodes for Flux Cored - Specficacion for Covered Carbon
13、 Steel Arc Welding - Specification for Low Alloy Steel Covered Arc Welding Electrodes. (Dol) adopted) Electrodes, (DoD adopted) Arc Welding, (DoD adopted) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-24633A 40 m 9797906 0423468 O m MIL-C-2
14、4633A AWS (Continued) A5.26 - Specification for Consumables Used for Electrogas Welding of Carbon and High Strength Low Alloy Steels. (DoD adopted) Shielded Arc Welding. (DoD adopted) Arc Welding. (DoD adopted) Qualification. A5.28 - Specification for Low Alloy Steel Filler Metals for Gas A5.29 - Sp
15、ecification for Low Alloy Steel Electrodes for Flux Cored B2.1 - Standard for Welding Procedure and Performance (Application for copies should be addressed to the American Welding Society, Inc., 550 NW LeJeune Road, P.O. Box 351040, Miami, FL 33125.) DET NORSKE VERITAS Certification Notes No. 2.6 -
16、Certification of Offshore Mopring Chain. (Application for copies should be addressed to Det Norske Veritas, Post Office Box 300, N-1322 Hovik, Oslo, Norway.) (Non-Government standards and other publications are normally available from These documents also the organizations that prepare or distribute
17、 the documents. may be available in or through libraries or other informational services.) 2.3 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes
18、applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection (see 6.4) in accordance with 4.3. 3.2 Material. Steel used in the manufacture of chain links and studs s
19、hall be ingot-cast process or continuous-cast process with a minimum reduction in area of 12:1, fully killed, and made to fine-grain practice. Sufficient croppage shall be taken from the top and bottom of each ingot or beginning and end of each continuously cast strand to ensure removal of harmful d
20、efects or segregation that would adversely affect the chain quality. Bar stock made from material at the top of the ingot or end of the continuously cast strand after cropping shall be iden- tified for testing. The bar stock for each heat of steel used in the manufacture of the links shall have an a
21、ustenite grain size of 5 or finer in accordance with ASTM E 112. links. same composition of material used in the first article sample in chemistry, quality and properties. The chain material shall be identified from steel mill to chain fabrication. Unidentified material shall be considered nonconfor
22、ming. Bar stock for links may be selected greater than the nominal chain size (link diameter! according to table.1, provided that the finished chain meets the dimensions and tolerances specified (see 3.3 and 4.5.7). greater than 0.75 times the bar stock tolerance. Studs shall be made of steel of the
23、 same composition used in the Studs shall be forgings. Material used in normal production shall be the Ovality of the bar stock shall be not 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL- G24633A TABLE I, Bar stock to1erances. I Permissible b
24、ar stock tolerance I (inches) I (inch) Chain size, inclusive 3/4 to 14/4 1-3/0 to 2-l./2 2-5/0 CO 3=1/2 3-5/0 to 4-3/4 Plus 3/64 Plus 1/16 Plus 3/32 Plus 1/8 3.2.1 paterial chemical composltioq, The chemical composition of the sfeel eknll be determined at the steel mill for each heat a steel and sha
25、l conowm to table II (see 4.6.1). rsfinerment shall be included, as necessary. alloying elements added ar limited by the manuacturer and the materia chemical composition shall be reported in the mill certification. Allaying elements to achieve required scrength and grain The material shall be analyz
26、ed for TABLE IX. Chemical comoosition ladle .analwie,. Element Crbll, c Silicon, Si Manganese, Mn Phosphorus, P Sulphur, S Weight: percent: (maximum) 0,33 0.37 1.94 o IO30 o ,050 3.2.2 Bateria1 mechanical Frauertieq. Che bar stock used in the manufac- ture of the chain links, aEter receiving identic
27、al heat: treatment: as the chain (see 3.15.4), shall passem the mechanical properties specified in tabla XII when tested (see 4.6.7 and 4.6.8). I Property Yield strength (0.2 percent ofsec) Ultimate tensile strength Elongaeion specimen gauge length - Reduction in area Specimen impact:, Charpy Veno t
28、ch, 4X specimen dameter overage for three specimens et 32*F 3.2.3 pecavered matarialq. Unless otherwise inesrpsratsd in the products covered by this sped fabricated using-materials produced from recovered praseisable without jeopardizing the intended use, 68 , ooo b/n2 99,600 lb/in2 18 percent: 45 p
29、ercent: 43 e-lb speciied herein, all materials ication shall be new and may be materials to the ruaximua extent: The term ffxecovemd materialsll means materials which have been-collacced or recovered rom solid waste and 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without l
30、icense from IHS-,-,-MIL-C-24633A L(0 W 7777706 0423470 7 m MIL-C-24633A reprocessed to become a source of raw materials, as opposed to virgin raw materials. None of the above shall be interpreted to mean that the use of used or rebuilt products is allowed under this specification unless otherwise sp
31、ecifically specified. 3.3 Link weiEht and dimensions. Link weight and dimensions shall be in accordance with table IV, figure 1, and figure 2 (see 3.2). Link tolerances shall be in accordance with figure 2 and table V. measured from every third link (see 3.11, 4.5.1, and 4.7.1). A maximum flash trim
32、 overage permitted after the flash butt weld is deburred shall be as specified in table V (see 3.15.2.1). The grip radius (G) of each end of the link shall be symmetrical to ensure proper fit and function in the chain handling equipment. Length over six links shall be 5 Provided by IHSNot for Resale
33、No reproduction or networking permitted without license from IHS-,-,-0-3/4 O-7/8 1 1-1/8 1 -I/ Stud size and shape, aligpent: and centering shall be in accordance with figure 2 (see 4.7.13). 3.6.1 Studq. The scud shall not have procrusions on either end OE the saddle. flash from the stud forging pro
34、cess. resulting from the stud pressing process shall be within ehe limits speciied in cable VXI. metor of the stud saddle shal. be radiused to prevenc sharp encry inta the link The stud shall ba pressed into the link body and shall hava no protruding Stud penecracion into the link body Stud insertio
35、n shall be measured in accodance with 4.5.5. The peri- body. TABLE: VIT, Stud tmnetratioq. Stud penetration at: midplane I Maximm (inch) o, 0% O, 07c u C - Link diameter (see Eigum 2). 3.7 Flmh butt weld usion. The flash butt weld shall be free of defects causing ultrasonic (UT) back ePlections equa
36、l Co or greater than the standard when moaeured in accordance wth 4.5.4. 3.8 JAnk and stud .interaq. Links and studs shall be free from harmful defocts such as laps, seams, pipes, cracks, ins, porosity, burms, flakes, slivors, scabs, forged in scale, nonmetallic inclusions and undue segregacon when
37、examined in accordancs with 4.5.5 and 4.7.14. 3.9 J3isian zone microstructure. The fusion zone of the flash buet: weld and scud weld urms r;kall have fine grain structure (grain size 7 or finer in accor- dance with ASTM E 112) and be free from Widmanstateen (needle-like) structure of any form when e
38、xamined in accordance with 4.5.9 and 4.5.10 (see 3.15.4) afmr hear; 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-24633A 40 = 7777906 OLI23474 b W MIL-C-24633A treating. examined in accordance with 4.5.9 for signs of overheating. zones shal
39、l be free of grain boundaries with intergranular fissuring and hot cracking. The stud weld fusion zones shall be free of cracks and fissures when examined in accordance with 4.5.10. The heat-affected zones on each side of the flash butt weld shall be The heat-affected 3.10 Stud weld. Magnetic partic
40、le inspection shall be performed on the stud weld (see 4.5.6), and the stud weld shall be free of cracks and fissures as speci- fied in 4.7.12. Stud weld size shall be in accordance with figure 3. Minimum iJ Dimension dimens ion designation (inches) H 0.1c I 0.2c J I 0.09c I/ C - Link diameter (see
41、figure 2). FIGURE 3. Stud weld dimensions. 3.11 Chain length. The chain shall be in 90-foot shots (15 fathoms) (see 1.2 and 6.2). constitute a 90-foot shot. from every third link shall be within the limits specified in table IV (see 3.3 and 4.5.1). end of the chain, shall be measured twice with diff
42、erent combinations of adjacent links totaling six links (see 4.7.1). A chain containing the number of links specified in table IV shall The overall length of six consecutive links measured By this method of measurement, every link, except three links at each 4.5. spec weld weld 3.11.1 Chain weight.
43、2. Each shot of chain shall be weighed in accordance with 3.12 Chain breaking load. fied (see table IV and 4.6.2). (see figure 3). The chain shall withstand the breaking load There shall be no cracking in the flash butt flash butt weld heat-affected zone, or in the area of the toe of the stud 9 Prov
44、ided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.13 Chain proof load, The chain shall withseand the proof load specied (see tablo IV) without: fraccure (sea 4.63). flash butt weld, flash butt: weld heat:eafected zone, or in the area of the toe o the atu
45、ci weld (see figure 3). taken OP all proof load teaita during both first: article and nominal produccion tostef. There shall. be no cracking in the Stzip chart: recordings of the applied load shell be 3.13.1 Chain sizing, Chain may be sized (lengthened) to meet: six=link length requirements by apply
46、ing a load n excess o the proof! load (see 4.6,3 and 4.7.1). the designated classiicaton society survyor recorded on strip charts, However, such sizing, shall not: be done withouf: the concurrence o Sizing loads applied shall be 3.13.2 , or portion thereof, will be haat: created more than twice. spe
47、ed shall be controlled, Each link shall be maintained at: a temperature between 1500F minim and 1750F maximum for a period detxmined as a resulc OE firm article production. ar quenched and tempered in such a manner thac differential cooling does not occur rolative to opposite sides of the links, for
48、 normal production. accummu1at:ing chain in areas with elevated temperaures that: may affect the air- cooling * “he stud of each link shall be permanently marked, in raised letters or lettersr indented with a blunt nose toolL, with WSN“ and the chain size in fractional inchaa on one side, and wLth t
49、he brand name or trade name OF the manufacturer on tha other side. The studs of both end links o each 90- foot shot shall be marked with serial numbers assigned by the manufacturer and tracsable to product:ion, test; inspection and certiicacion records (see 4.5=12). Markings shall be a minimum aE 5/32 inch in height: or 3/4 to l-l/. After satisfactory completion of all. tests and inspections, t
