1、i$ MIL-N-BLLSLA 75 777970b 0422bb2 2 MI L-N- 81 19 1A (OS) 11 January 1972 SUPERSEDING 18 December 1964 MIL-N-81191 (WP) MILITARY SPECIFICATION NICKEL-TITANIUM ALLOYS, LOW MAGNETIC EFFECTS; BARS, PLATES, SHEETS, STRIPS, AND SHAPES (FOR SPECIAL PURPOSE TOOLS AND EQUIPMENT) This specification has been
2、 approved by the Naval Ordnance Systems Command, Department of the Navy. 1. SCOPE 1.1 Scope. This specification .covers three different nickel-titanium alloys having low magnetic pe.rmeability and having the capability of developing moderate to high mechanical properties by metallurgical processing,
3、 (See 6*1,) * 1.2 Classification. The nickel-titanium alloys covered by this speci- fication shall be furnished in the following nominal comDositions forms. and conditions, or combination of condition;, as specifid (see 6.2). Comnos i ti ons : 1-55% Ni - 45% Ti 2-56.5% Ni - 43.5% Ti 3-60% Ni - 40% T
4、i Forms : - B ar Plate Sheet Strip Shape Conditions : A-Cas t B-Hot worked C-Cold worked Licensed by Information Handling ServicesMIL-N-BLLSLA 75 77777Ob 0q22bb3 4 MIL-N-81191A (OS) D-Annealed E-Quench hardened F-Quench hardened and tempered 2, APPLICABLE DOCUMENTS 2,l The following documents of the
5、 issue in effect on date of invita- tion for bids or reqaiest for proposal, form a part of this specification to the extent specified herein, SPECIFICATIONS Mi lit ary * MIL-M-19595 Magnetic Effect Limits for Nonmagnetic Equip- ment Used in the Proximity of Magnetic Influ- ence Ordnance STANDARDS Fe
6、deral FED-STD- 4.8 FED-STD-151 Mi li t ary MIL-STD-105 Tolerances for Steel and Iron Wrought Products Metals ; Test Methods Sampling Procedures anc Attributes Tables for Inspection by MIL-STD-163 Steel Mill Products, Preparation for Shipment and Storage (Copies of standards required by contractors i
7、n 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 thAc specification to the extent specified herein. Unless otherwise indicated, the issue in eff
8、ect on date of invitation for bids or request for.proposa1 shall apply, 2 Licensed by Information Handling ServicesMIL-N-BLLSLA 75 = 7979706 0q22bb4 b MIL-N- 8119 1A (OS) American Society for Testing and Materials ASTM E 18 Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials AS
9、TM E 140 Standard Hardness Conversion Tables for Metals (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pa. 19103.) 3. REQUIREMENTS * 3.1 Chemical composition. The chemical composition of the alloys covered in this specif
10、ication shall conform to the requirements of - table I. Table I CHEMICAL COMPOSITIONS (PERCENT) Compos it i on nmb er- 1 2 3 Element Titanium 44.5 - 45.4 43 - 44 39 - 41 Iron, maximum 0.10 0.10 o .10 Other, maximum 0.1 0.1 0.1 Nickel Balance Ba 1 an ce Balance 3.1.1 The contractor shall furnish an a
11、nalysis of each lot showing the percent by weight of each of the elements specified in table I. 3.2 Hardness. Unless otherwise specified in the contract or order, the conditions (see 1.2) of the forms for the specified.alloy compositions shall conform to the Rockwell hardness requirements of table I
12、I. * 3.3 Magnetic effect. All forms of these alloys shall conform to the magnetic effect requirement of paragraph 3.2 in MIL-M-19595, 3.4 Microstructure, The microstructure of the forms of the specified alloy composition shall show a homogeneous distribution of the phases and, for all wrought forms,
13、 uniformly sized and equiaxed grains, 3 Licensed by Information Handling ServicesMIL-N-LL7LA 75 m 977770b OLI22bb5 m MIL-N-81191A (OS) Table II ROCKWELL HARDNESS REQUIREMENTS Condi ti on cast Hot worked2 Cold worked Anneal ed2 Quench hardened2 Quench hardened and tempered2 1 - 25 HRC, maximum 3 - 1
14、1 Compos i ti on numb e I 0- 1 45 HRC, maximum 3 35 HRC, maximum 40 - 47 HRC 30 - 47 HRC n 55 HRC , maximum 55 HRC, maximum -3 42 HRC, maximum 57 - 62 HRC 30 - 62 HRC 1 Hardness is %ot required.” 2See 6.3 for recommended temperature. 3Hardness shall be las required” by the procuring activity but sha
15、ll not exceed 40 HRC, 3,5 Macrostructure, The macrostructure of the forms of the specified alloy composition shall be dense, sound, free from pipes, fissures , sponginess, abnormal inclusions or segregations, or unusually numerous pinholes, 3.6 Dimensions and tolerances. Dimensions and tolerances fo
16、r shapes shall be as specified in the contract or order (see 6.2). For the com- mercial forms, tolerances shown in the following paragraphs of FED-STD-48 shall be applicable: Form and dimension Paragraph Bars, hot-worked: Diameter or distance across flats (round or square) la1 Distance across flats
17、(hexagon) 1 a2 Width and thickness (flats) ld3 Length 1 d4 Straightness (machine s traightened) 1 d5 Bars a cold-worked: Diameter or distance across flats (round. or square) 2dl Distance across flats (hexagon) 2d2 4 Licensed by Information Handling ServicesMIL-N-BLLSLA 75 M 9777706 Oq2266b T M MIL-N
18、- 81191A. (OS) Width and thickness (flats) Length Straightness Plates : Thickness Width and length Camber F 1 atnes s Sheets : Thickness Width Length Res quared Camber Flatness Strips (for widths not covered-by the strip tables, use paragraphs specified above for sheet) : Thickness Crown Width Lengt
19、h. Camber 2d3 1 d4 2 d5 4a3 4 a4 4a9 4d5 12a2 12a3 1 la6 lla10 lla12 lla13 14al 14a2 14a3 14a4 14a5 3.7 Identification. All forms or bundles in a lot shall be readily identifiable by bearing one of the following identifications , as speci- fied in the succeeding paragraphs: (a) Specification number
20、, composition number, condition and hardness, lot number, manufacturers name, trademark or symbol, and heat number (b Specification number, composition number, and condition and hardness. 3.7.1 Bars and shapes. or across parallel flats , and shapes of equivalent cross-sectional area shall be rubber
21、stamped or marked with a nonwater-soluble stamped on or near one end with the information specified in 3.7(b), Bars, three-fourths inch or larger in diameter ink or die 3.7.2 Bars and shapes. Bars, less than three-fourths inch in diameter or across parallel flats , and shapes of equivalent cross-sec
22、tional area shall be bundled and tagged at ,each end with firmly attached oil-proof or metal tags containing the information specified in 3.7(a). 5 Licensed by Information Handling Services_I MIL-N-BLLSLA 95 H 99997Ob OL-122bb7 L M MIL-N-81191A (OS) 3.7.3 Plates, sheets, and flat strips, Plates, she
23、ets, and flat strips shall be identified as specified in 3.7(b) using the stamping or marking procedures of 3.7.1. 3.7.4 Coiled sheets and strips. When sheets and strips are shipped in coils and the size permits, the loose ends of the coils shall be identified as specified in 3.7(a) using the stampi
24、ng or marking procedure of 3,7,1, fication shall be provided by the procedure of 3.7.2. On coiled strips too nrrow for stamping or marking, identi- 3.7.5 Shapes, forged. Each forging whether shipped loose or in bundles shall, whenever possible, carry the identification preferably of 3.7(a) or second
25、ly of 3.7(b) using either the marking or stamping pro- cedure of 3.7.1, forgings shipped in bundles, the bundles shall carry the identification of 3,7(a) using the identifying procedure of 3.7.2, When individual marking is not practical for small 3.8 Workmanship. All forms shall have uniform surface
26、 finishes, The surfaces shall be commercially smooth, free from scale, corrosion, cracks, scratches, seams, laps or folds, slivers, and any injurious defect which would limit or impair its serviceability for the intended use, 4, QUALITY ASSURANCE PROVISIONS * 4.1 Responsibility for inspection. Unles
27、s otherwise specified in the contract or purchase.order, the supplier is responsible for the perfor- mance of all inspection requirements as specified herein, otherwise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspec
28、- tion requirements specified herein, unless disapproved by the Government, The Government reserves the right to perform any of the inspections set forth in this specification where such inspections are deemed necessazy to assure supplies and services conform to prescribed requirements. Except as 4.
29、2 Lot, A lot shall consist of material of one form, size, condi- tion, and melt, or fractions thereof, processed and manufactured under the same conditions when submitted for inspection and acceptance. - 6 Licensed by Information Handling ServicesMIL-N-81191A (OS) 4.3 Sampling. 4.3.1 For chemical an
30、alysis, Sample lection and preparation shall be in accordance with method 111 of FED-STD-151. Sources, sizes, and number of samples shall be in accordance with either one of the two following procedures for the test of 4.5.1: (a) From the usable portion of each ingot, two individual samples shall be
31、 taken; each sample shall contain not less than 2 ounces of millings or drillings . (b) From each lot of the specified form, one composite sample containing a minimum of 50 grams of clean millings, drillings, or clippings shall be taken, the composite sample shall be formed from specimens from each
32、length. If the lot contains less than four lengths, * 4.3.2 For hardness testing. From each lot, a total of five specimens from five individual lengths selected at random shall be taken and pre- pared in accordance with-ASTM E 18. five lengths, a specimen shall be taken from each length. Testing sha
33、ll be in accordance with 4.5.2. If the lot consists of less than 4.3.3 For magnetic effects test. From each lot,-a total of five specimens shall be taken from five individual lengths selected at random, If the lot consists of less than five lengths, a specimen shall be taken from each length, (see 6
34、.2), the size of each specimen shall have a minimum volume of three-fourths cubic inch, Unless otherwise specified in the contract or order Testing shall be in accordance with 4.5.3, 4.3.4 For microstructural examination. From each lot a minimum of three metallagraphic Specimens shall be taken of tr
35、ansverse locations, where possible, from three individual lengths selected at random, If the lot consists of less than three lengths, a specimen shall be taken from each length. Testing shall be in accordance with 4.5.4, 4.3.5 For macrostructural examination. From each lot a minimum of three macrost
36、ructure specimens shall be taken from three individual lengths selected at random, If the lot consists of less than three lengths, a specimen shall be taken from each length, Each specimen shall be representative of the central cross-sectional area of the specified form and, where possible, shall in
37、clude the entire cross- sectional area of the related length, Testing shall be in accordance with 4.5.5. 7 Licensed by Information Handling ServicesMIL-N-LL7LA 75 M 7979706 0422bb9 5 M MIL-N-81191A (OS) 4.3.6 For visual and dimensional examination, 4.3.6.1 Bars, plates, shapes, and flat sheets and s
38、trips. Bars, plates, shapes, and flat sheets and strips shall be sampled in accordance with the provisions of MIL-STD-105, inspection 1-eve1 II, acceptable quality level (AQL) 1.5 percent defective, lot size shall be the number of units of product in the lot. Examination shall be in accordance with
39、4.4.1.1. For sampling purposes, the 4.3.6.2 Coiled sheets and strips, sampled in accordance with the provisions of MIL-STD-105, inspection level II, AQL 2.5 percent defective, shall be the number of coils in the lot, Examination shall be in accor- dance with 4.4.1.2. Coiled sheets and strips shall b
40、e For sampling purposes, the lot size 4.4 Inspection. 4.4.1 Visual and dimensional examination. 4,4.1.1 Bars, plates, shapes, and flat sheets and strips. material of 4.3.6.1 shall be visually examined to determine compliance The sampled with 3.7 and 3.8 and dimensionally examined to determine confok
41、ance to the applicable dimensional requirements of 3.6. Any unit of product not conforming to any of the requirements of 3.6, 3.7, and 3.8 shall be classed as defective. upon an AQL of 1.5 percent defectives, Acceptance or rejection of the lot shall be based 4,4.1.2 Coiled sheets and strips, The sam
42、pled material of 4.3.6.2 shall be visually examined to determine compliance with 3.7 and 3.8 and dimensionally examined to determine conformance to the applicable dimensional requirements of 3.6. A minimum of 10 percent of the area in each coil of the sample shall be examined, to any of the requirem
43、ents of 3.6, 3.7, and 3.8 shall be classed as defective. AQL of 2.5 percent defectives, Any coil not conforming Acceptance or rejection of the lot shall be based upon an 4,4,2 Packaging, packing, and marking examination. The entire lot Any bundle, lift, or shall be visually examined to assure compli
44、ance with the packaging, packing, and marking requirements of section 5. shipping container failing to conform to the requirements of section 5 shall be rejected. 8 Licensed by Information Handling ServicesMIL-N-LL7LA 75 = 777770b OY22b70 L MIL-N-8119 1A (OS) 4.5 Tests. * 4.5.1 Chemical analysis. Th
45、e sample(s) of 4.3.1 shall be analyzed in accordance with any of the acceptable procedures specified in method 111 or 112 of FED-STD-151. This analysis shall conform to the compositional requirements for the specified alloy in table I * 4.5.2 Hardness. Each specimen of the sample obtained in 4.3.2 s
46、hall be prepared and tested in accordance with ASTM B 18. hardness determinations shall be made on each specimen and the average for each specimen reported. ticable. table IV of ASTM E 140 shall be used and the results reported as HRC values, condition shall conform to the related requirement in tab
47、le II. Three Rockwell The HRC scale shall be used whenever prac- In the event that the superficial HRN scales have to be used, Each average hardness value for the specified alloy, form, and * 4.5.3 Magnetic effect test. Each specimen of the sample obtained in 4.3.3 shall have its magnetic effect det
48、ermined in accordance with para- graph 4.4.1 of MIL-M-19595 to assure compliance with the requireme; of 3.3 herein. * 4.5.4 Microstructural examination. Each specimen of 4.3.4 shall be polished, etched (a solution of 5 nil HNO3:l ml HF (48%):44 ml- distilled water is recommended), and examined at 10
49、0 to 200 magnifications on a metallograph to assure compliance with the requirements of 3.4. 4.5.5 Macrostructural examination, Each specimen of 4.3.5 shall be polished to a number Ometallographic paper finish, deep acid etched (an aqueous solution of HF:HNO3 or HNQ3 is recommended), and examined to assure compliance with 4.3.5. 4.6 Rejection criteria. Should any sample fail to comply with the specified requirements of this specification or should the lot fail to pass the examination of 4.4.1, the 1st shall be rejected, 5, PREPARATION FOR DELIVERY 5.1 Packaging
