1、NIL-C-L73LLB 75 W 7779706 OLL7352 7 MIL-C-19311B (OS) 16 March 1973 SUPERSEDING 7 December 1962 MIL-C-19311A (WEP) MILITARY SPECIFICATION COPPER-CHROMIUM-ALLOY FORGINGS, WROUGHT ROD, BAR, AND STRIP (COPPER ALLOY NUMBERS 182, 184, AND 185) This specification has been approved by the Naval Ordnance Sy
2、stems Command, ! Department of the Navy. 1. SCOPE *l. 1 Scope. This specification covers copper-chromium-alloy forgings and also wrought material in rod, bar, and strip form which have been solution heat treated, quenched, cold worked, as applicable, and precipi- tation heat treated. (See 6.1 .) “1.
3、2 Classification. The copper-chromium alloy shall be of the composi- tions designated in table I, as specified (see 6.2). 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issues in effect on date of invita- tion for bids or request for proposal form a part of this specification to the exte
4、nt specified herein. SPECIFICATIONS Military *MIL-C-3993 Copper and Copper Base Alloy Mill Products; Packaging of STANDARDS Federal FED-STD-146 Tolerances -. for Copper and Copper Base Alloy Mill Products A Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS
5、-,-,-MILG1911B (OS) FED-STD-151 Metals ; Test Methods FED-STD-185 Continuous Identification Marking,of Copper and Copper Base Alloy Mill Products Mi lit ary MIL-STD-105 Sampling Procedures and Table for Inspection by Attributes MIL-STD-129 Marking for Shipment and Storage (Copies of specifications,
6、standards, drawings, and publications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) “2.2 Other publications, The following documents form a part of this specification to the extent sp
7、ecified herein. Unless otherwise indi- cated, the issue in effect on date of invitation for bids or request for proposal shall apply. American Society for Testing and Materials (ASTM) B 193 B 249 B 342 Standard Method of Test for Resistivity of Electrical Conductor Materials Standard Specification f
8、or General Requirement for Wrought Copper and Copper Alloy Rod, Bar and Shapes Tests for Electrical Conductivity by Use of Eddy Currents B8 Tension Tests E 18 Rockwell Hardness Tests (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Phil
9、adelphia, Pa. 19103.) Consolidated Classification Committee Consolidated Freight Classification Rules (Applications for copies should be addressed to the Consolidated Clas- sification Committee, 202 Chicago Union Station, Chicago, Ill, 60606.) 2 Provided by IHSNot for ResaleNo reproduction or networ
10、king permitted without license from IHS-,-,-,I MIL-C-39333B 95 999990b 0337354 O MIL-C-19311B (OS) 3.2 Chemical composition. Chemical composition shall conform to one of the compositions shown in table I *Table I CHEMICAL COMPOSITLON (Percent maximum unless shown as a range or minimum) Copper (incl.
11、 silver) + Iron Chromium Silicon Le ad Arsenic Calcium Lithium Phosphorus Zinc Silver elements with specific limits Copper alloy No. 182 99.5 0.10 0.6-1.2 0.10 O .O5 - - - - - - Copper alloy No, 184 99.8 O. 15 0.40-1.2 0.10 O .O05 -0.005 O .O5 O .O5 0.7 - - Copper alloy No. 185 99.8 - O .40-1.0 o ,0
12、15 - - - - O .O4 -. 0.08-0.12 3.3 Heat treatment. The alloy shall be solution heat treated and artificially aged in such a manner as to produce material which will conform to all requirements of this specification. The solution heat treatment shall be performed in a neutral or slightly reducing atmo
13、sphere to minimize the surface layer of chromium oxide subscale. 3.4 Mechanical properties. After heat treatment and working to final form (for rod, bar, and strip), the mechanical properties shall conform to the requirements given in table II when tested in accordance with 4.3.3. 3 Provided by IHSN
14、ot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-19311B (OS) *Table II MECHANICAL PROPERTIES Dimensions (inches) Rounds-diameter 1.50 or less Over 1.50 to 2.00 incl, Over 2.00 to 2.50 incl, Over 2,50 to 3.75 incl. Hexagons or octagons - - across flats 0.590 to
15、1.25 incl, Over 1.25 to 3.00 incl, Rectangles“ Thickness Width Up to 1.00 incl. Al 1 Forging 0.5 percent extension under load. Tens i le strength, min. (psi) 63,000 59,000 57,000 53,000 63,000 55,000 Yield strength, min. (psi) 56,000 52,000 49,000 40,000 56,000 45,000 60,000 50,000 53,000 40,000 Elo
16、nga- tion in 2 inches, min. (%) 13 13 13 13 13 13 Rockwell B Hardness, min. 72 70 68 62 68 65 13 70 13 62 3.5 Electrical conductivity. “3.5.1 Electrical conductivity after heat treatment and working to final configuration shall not be less than 75 percent. 3.5.2 One hundred percent is defined as the
17、 conductivity of copper having a resistance of 0.15328 ohm per meter, gram at 20“ centigrade (68 Fahrenheit). 3.5.3 Conductivity shall be determined as specified in 4.3.4 on sam- ples taken from heat-treated forgings (or bars or strips) from each melt. Provided by IHSNot for ResaleNo reproduction or
18、 networking permitted without license from IHS-,-,-MIL-C-19311B (OS) 3.6 Forging dimensions. 3.6.1 The manufacturer shall be responsible for furnishing forgings that can be laid out and machined to the finished dimensions within the permissible variations shown on the applicable drawings and that wi
19、ll conform to such gauges as may be specified. Forgings of excessive size and weight shall not be furnished. 3.6.2 Forged-to-size portions of forgings shall conform to such dimensions and permissible variations as may be shown on the appIicable drawings and shall not be warped or distorted in such a
20、 manner as to adversely affect their appearance or serviceability. 3.7 Dimensional tolerances. The dimensions of the copper chromium alloy offered for delivery shall not vary from ordered dimensions by amounts greater than as follows: Dimensions Paragraph Diameter of round rods or llb (1) FED-STD-14
21、6 diameter across flats of hexagons and octagons Width of rectangular sections 2b (2) FED-STD-146 Thickness of rectangular Table III of this specification sections 3.8 Camber. Round, hexagonal, and octagonal rods shall be commerically straight and shall be suitable for use in automatic screw machine
22、s. 3.9 Rounding of corners of strip. 3.9.1 Strip stock, whose thickness is between 0.051 and 0.102 inch, inclusive and whose width does not exceed O ,102 inch with a width-to- thickness ratio of less than two-to-one, shall have corners rounded to a maximum radius of O ,016 inch. Provided by IHSNot f
23、or ResaleNo reproduction or networking permitted without license from IHS-,-,- . . - MIL-C-IIILB 45 W 777770b 011117357 b m MIL-C-19311B (OS) Table III THICKNESS TOLERANCES I+ FOR RECTANGULAR SECTIONS Thickness (inches) Up to 0.017 Over 0.017 to 0,026 Over 0.026 to 0.050 Over 0,050 to 0,090 Over 0,0
24、90 to O, 130 Over 0.130 to 0.188 Over 0,188 to 0,500 Over 0,500 to 1,000 Over 1,000 to 2,000 Over 2 .O00 to 4,000 IExpressed to the nearest 0.001 r up to O .O50 o ,001 0.0015 0.002 - - - - - - :h. Ove r O ,050 to 1.25 0.001 O ,0015 o ,002 O ,003 O .O03 O. 0045 O ,005 O ,006 O ,007 - Width Over 1.25
25、to 2.00 o ,001 0.0015 0.002 0.003 O. 0035 O .O05 O ,006 O ,007 O .O07 - .nches) Over 2 .o0 to 4.00 0.001 O ,0015 o ,002 O. 0035 O ,004 O. 006 O .O07 O ,008 o ,009 O, 50% Ove r 4.00 to 8.00 o ,001 O ,0015 o ,002 O. 0035 O ,005 O ,008 o. O09 0.010 o ,011 0.50%l Over 8.00 o ,002 O ,004 O. 005 o .o11 o
26、,012 O ,013 O. 014 O .SO% 3.9.2 Strip stock, whose thickness is less than 0,051 inch and which has a width-to-thickness ratio of less than two-to-one, shall have corners rounded to a maximum radius of 0.008 inch. “3.10 Identification marking. hhen specified, product identification marking shall be i
27、n accordance with FED-STD-185. 3 , 11 Workmanship. 3.11,l Rod, bar, and strip stock shall be clean and bright, with a good commercial finish and shall be free from injurious imperfections that would render the material unfit for its intended application. Rod, bar, and strip stock shall be cold worke
28、d to final form. 3.11.2 Forgings shall be of uniform quality and conditions, free from blisters, fins, folds, seams, laps, cracks, segregations, spongy areas, and other defects which would affect their suitability for the purpose intended. 6 Provided by IHSNot for ResaleNo reproduction or networking
29、 permitted without license from IHS-,-,-MIL-C-3733LB 75 a 7777706 0337358 8 W MIL-C-19311B (OS) 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsiblity for inspection. Unless otherwise specified ih the contract or purchase order, the supplier is responsible for the perfor- mance of all inspection requirem
30、ents as specified herein. Except as otherwise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspec- tion requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform an
31、y of the inspections set forth in this specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. “4.2 - Lot. A lot shall consist of material of the same form, composi- tion, and condition from a single furnace charge or crucible mel
32、t, 4.3 Sampling and tests. Unless otherwise specified and when applica- ble, the sampling plans and procedures shall be in accordance with the provisions of MIL-STD-105. 4.3.1 Sampling for visual and dimensional examination. Samples of forgings, rods, bars, and strip for visual and dimensional. exam
33、ination for acceptance shall be taken from each lot in accordance with the pro- visions of MIL-STD-105, inspection level II and acceptance quality level (AQL) 1.5 percent defective, “4.3.2 Chemical analysis. The samples shall be selected, prepared, and analyzed in accordance with method 111 or 112 o
34、f FED-STD-151. If another method of analysis is desired, it shall be as agreed upon by the contractor and procuring activity. “4.3.3 Mechanical properties. A minimum of one sample shall be randomly selected from each lot and each sample shall be subjected to a tensile and hardness test. Failure of o
35、ne sample to meet any. of the requirements of table II shall result in the rejection of the lot represented, Mechani- cal properties shall be determined as specified in ASTM E 8 and ASP4 E 18. “4.3.4 Electrical conductivity tests. A mnimum of two samples shall be randomly selected from each lot and
36、subjected to the conductivity test, Conductivity shall be determined by any method approved by the-procuring activity (preferably ASTM B 342, see 4.3.4.2). Failure of any of the samples to meet the requirements given in 3.5 shall be cause for rejec- tion of the lot represented. Samples from each mel
37、t, as specified in Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-19311B (OS) 3.5.3, shall be prepared for test by the methods specified in 4.3.4.1 or by any other method approved by the procuring activity. *4,3.4,1 Electrical conductivity of
38、forgings, rod, bar, or strip shall be determined by resistance measurements made on a sample- of finished item cut to such width and length as will afford satisfactory measure- ments (Asn1 B 193) * “4.3.4.2 Electrical conductivity measurements may be determined using an instrument employing eddy cur
39、rants (ASTM B 342). 4.3.5 Marking. Samples selected in accordance with 4.3.1 shall be examined for compliance with 3. II). 4.3.6 Workmanship. Samples selected in accordance with 4.3.1 shall be inspected as specified for compliance with 3.11. 5. PREPARATION FOR DELIVERY “5.1 Packing. Packing shall be
40、 level A, B, or C, as specified (see 6,2). *5, l. 1 Levels A and B. The material shall be packed in accordance with MIL-C-3993. “5.1.2 Level C. The products shall be separated by size, composition, and temper and packed in accordance with the manufacturers standard practice into containers of a type
41、 and size commonly used for the purpose, in such a manner as to insure acceptance by carrier for transportation at the lowest rate applicable and to afford maximum protection from nor- mal hazards of transportation. 5.2 Marking. Unless otherwise specified in the contract or order each bundle, shippi
42、ng container, and unpacked forging shall be marked with the name of the material, part number as specified on the drawings, alloy and condition of the forgings, this specification number, the gross weight and quantity, the name of the contractor, and the number of the contract or order. 8 Provided b
43、y IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-19311B (OS) “5.2.1 In addition to the marking specified in 5.2 and any special markings required in the contract or order, marking of the shipping cc&- tainers shall be in accordance with MIL-STD-129. 6. NO
44、TES “6.1 Intended use. Copper-chromium-alloy is intended for applications requiring high electrical conductivity and higher mechanical strength than is attainable with copper. Major usage is primarily for resistance welding electrodes, structural members in spot welding units, and for forming the cr
45、ucibles for electroslag melting. *6.2 Ordering data. Procurement documents should specify the following: (a) Title, number, and date of this specification (b) Size, shape, and quantity (c) Drawing number for forgings (d) Composition (see table I) (e) Level of packing (see 5.1) (f) Special marking, i
46、f required (see 5.2.1) (g) Inspection for workmanship, if required (see 3.11) (h) Where quantity is large, it may be desirable to require that the material be melt identified (i) Where application requirements mandate material properties that approach the attainable limits, melt identification becom
47、es necessary, *6.3 Preparation for delivery criteria. Criteria for use of the proper level of packaging and packing shall be as follows: Level A. This level shall be used for those items which are to be shipped to indeterminate destinations or stored under indeterminate cn- ditions for redistributio
48、n anywhere. Level B. This level shall be used for protection against damage during multiple domestic shipments, handling, and covered storage. . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-19311B (OS Level C. This level shall be used only w
49、hen it is definitely known that the packaged item is to be shipped to domestic installations for immediate use at the first receiving activity. “6.4 The margins of this specification are marked with an asterisk to indicate where changes (additions, modifications, corrections, dele- tions) from the previous issue were made. This was done as a convenience only and the Government
