DLA MIL-W-21425 B-1975 WIRE STEEL HIGH CARBON SQUARE UNCOATED FOR MECHANICAL SPRINGS《机械弹簧方未上漆的高碳钢圈》.pdf

1、MXL-W-ZL425B 75 W 7777406 OLL7bb4 4 MIL-W-21425B MILITARY SPECIFICATION WIRE, STEEL, HIGH CARBON, SQUARE, UNCOATED, FOR MECHANICAL SPRINGS (GENERAL PURPOSE) 30May 1975 SUPERSEDING MIL-W-2 1425A 23 April 1962 This specification is approved for use by all departments and agencies of the Department of

2、De fense. 1. SCOPE 1.1 Scope. This specification covers three types of uncoated, squake (0.050 to 0.500 inches in width), high-carbon steel wire (see 6.1). 1.2 Classification. Wire shail be of the following types, as specified (see 6.2): Type 1 Type II Type III1 Oil tempered spring wire for the manu

3、facture of springs which require no subsequent hardening. Hard drawn wire for the manufacture of springs which require no subsequent hardening. Soft (0.55 to 0.75 carbon) wire for the manu- facture of springs which are to be hardened after cold forming, furnished in two conditions as follows (see 6.

4、1.3): Condition A - Annealed at finished size Condition B - Annealed and ightly drawn. 1If a condition letter is not specified for type III wire, either condition A or condition B may be selected at the option of the spring manufacturer. . m Provided by IHSNot for ResaleNo reproduction or networking

5、 permitted without license from IHS-,-,-MILW-21425B 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on the date of invitation for bids or request for proposals form a part of this specification to the extent specified herein. STANDARDS Federal FED-STD-66 Steel: Chemical Co

6、mposition and Hardenability FED-STD- 1 5 1 Metals; Test Methods Military “MILSTD-129 Marking for Shipment and Storage MILSTD-163 Steel Mill Products, Preparation for Shipment and Storage (Copies of specification, standards, drawings, and publications required by contractors in connection with specif

7、ic procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) “2.2 Other publications. The following document forms a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in effect on date of invitation

8、 for bids or request for proposal shall apply. American Society for Testing and Materials (ASTM) Standards A 318 Tension Testing of Steel Spring Wire (Application for copies should be addressed to the American Society for Testing and Materials, 1901 Race Street, Philadelphia, PA 19 103.) 3. REQUIREM

9、ENTS 3.1 Process. The steel for the manufacture of the wire shall be made by the open-hearth, basic oxygen, or electric-furnace method. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-2L425B 75 7799706 OlL7bbb MIL-W-2 1425B 3.2 Chemical compo

10、sition. The composition of the steel shall be as shown in table I, subject to the variations for check analysis given in table 4 of FED-STD-66. Table I CHEMICAL COMPOSITION (LADLE ANALYSIS). I and III . . . 0.55-0.75 0.60-1.201 0.10-0.30 0.040 II . . . . . . . . 0.45-0.75 0.60-1.203 0.10-0.30 0.040

11、0.050 0.050 For type III wire, manganese shall be between 0.80 and 1.20 percent for widths 3/16 inch Not varying more than 0.20 percent in any one lot. 3Not varying more than 0.30 percent in any one lot. an larger. *3.3 Defects. The wire shali be free from cracks, pipes, and other detrimental imperf

12、ections (see 6.1). “3.4 Surface. All wire shall be smooth and free from rust. Type I and type III, condition A, wire shali be free from excessive surface oxidation and shall be oiled or given an equivalent protective coating. Type II and type III, condition B, wire shall be free from scale or surfac

13、e oxidation and shali be oiled. 3.5 Uniformity of form. Ali wire shall be sufficiently uniform in quality and temper to permit manufacture of springs. The wire shall not be wavy or kinked. 3.6 Dimensions. The wire shall be of the size specified, subject to the tolerances given in tables II and III.

14、3.7 Wrapping properties. The wire shall be free from cracks after wrapping around a mandrel of the size shown in table IV. Unless otherwise specified (see 6.4), the wrapping test shall not be required for wire of widths over 0.3 12 inch or for type III material. 3 Provided by IHSNot for ResaleNo rep

15、roduction or networking permitted without license from IHS-,-,-Table II TOLERANCES FOR WIDTH AND OUT-OF-SQUARE (All dimensions are in inches) Tolerance Out-of- Width plus and square 0.050 to 0.071, Incl. . 0.0015 0.0020 0.072 to 0.375, incl. . 0.0030 0.0040 minus maximum 0.376 to 0.500, incl. . 0.00

16、45 0.0060 Table III CORNER RADII (All dimensions are in inches) Comer radius Minimum Maximum Width c 0.050 to 0.125,incl 0.012 0.017 0.251 to 0.312, hcl. . 0.030 0.040 0.126 to 0.188,hcl , . . , . , . . 0.025 0.189 to 0.250, inc. . 0.025 0.035 0.313 to 0,500, inci. . 0.035 0.045 0.020 Table IV MANDR

17、EL SIZE FOR WRAPPING TEST (All dimensions are in inches) Wire width I Diameter of mandrel 0.050 to 0.162, incl. . . 0.163 to 0.312, hd Diagonal of wire Twice the diagonal of wire Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-2 1425B 3.8 Mecha

18、nical properties. 3.8.1 Type I wire. Type I wire shal be quenched and tempered to obtain the tensile strength specified in table V. Table V Width - (in.) 0.050 0.054 0.062 0.072 0.080 0.091 0.105 0.120 0.135 0.148 0,162 0.177 0.192 0.207 0.225 (1.250 0.312 0.375 0.437 0.500 TENSILE STRENGTH, TYPE I

19、WIRE Tensile strength (pi) Minimum 253,000 247,000 241,000 235,000 230,000 225,000 220,000 215,000 210,000 205,000 200,000 195,000 190,000 188,000 185,000 183,000 180,000 175,000 170,000 165,000 Maximum 283,000 277,000 271,000 265,000 260,000 255,000 250,000 240,000 235,000 230,000 225,000 220,000 2

20、15,000 213,000 2 1 o ,000 208,000 205,000 200,000 195,000 190,000 For widths other than those show in table V, tensile strength shaii be deterrnin- ed by interpolation. 3.8.2 Type II wire. Type II wire shall be cold drawn to obtain the tensile strength specified in table VI. 3.8.3 Type II wire. 3.8.

21、3.1 Condition A. Type III, condition A, wire shall be annealed at finished size and shal have no cold work in the finished condition. The maximum tensile strength shall be 95,000 psi. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-M1L-W-2 1425B Tabl

22、e VI TENSILE STRENGTH, TYPE II WIRE Width (in.) Tende strength (psi) Minimum I Maximum 0.050 0.054 0.062 0.072 0.080 0,091 0.105 0.120 0.135 0.148 0.162 0.177 0.192 0.207 0.225 0.250 0.312 0.375 0.437 0.500 243,000 237,000 232,000 227,000 221,000 216,000 210,000 206,000 203,000 200,000 195,000 192,0

23、00 190,000 186,000 182,000 174,000 167,000 162,000 1 5 6,000 152,000 279,000 272,000 266,000 261,000 254,000 248,000 241,000 237,000 234,000 230,000 225,000 221,000 218,000 214,000 210,000 200,000 19 3 ,O O0 187,000 180,000 176,000 For widthsother than thoseshown in table VI, tensile strength shall

24、be determin- ed by interpolation. *3.8.3,2 Condition B. Type III, condition B, wire shall be annealed and shall be given at least one pass through dies or rolls after the last annealing treatment. The minimum tensile strength shall be 100,000 psi and the maximum, 130,000 psi. 3.8.3.3 When heattreate

25、d. Type III wire, when heattreated, shall develop the properties of table V. *3.9 Cast. Type II wire shall be properly cast. When tested as specified in 4.5.4, wire shall lie substantially flat on itself and shall not spring up and show a wavy condition. 3.1 O Coil sizes and weights. Unless otherwis

26、e specified, wire shaii be furnished in the coil diameters and weights specified in table VI1 for the appropriate wire size. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-2 1425B Table VI1 APPROXIMATE COIL DIAMETERS AND WEIGHTS Approx. mean

27、 Approx. coil coil diameter weights (in.) I (lb) Wire Wire size type (in.) I II and III 0.050-0.080 0.081-0.160 0.161-0.375 0.376-0.500 0.050-0.0625 0.063-0.1875 O. 188-0.375 0.376-0.500 24,22, 16 54,48,42,36,30 60,54,48,42,36 72,60,54 22,16 30, 28,26,24,22 36, 30, 28,26,24,22 36,30 28,26 75-300 125

28、-600 150-600 150-600 75-300 125-600 150-600 3.11 Identification marking. Each coil shall have two substantial tags, printed with the name or trademark of the manufacturer, the specification number, the size, the type, and the condition. “3.12 Workmanship. The wire shall be substantially uniform in q

29、uality and temper and shall not have imperfections of a nature or degree, for the grade and quality ordered, that will be detrimental to the forming or fabrication of finished parts. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purc

30、hase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or order, the supplier m.ay use his own or any other faciiities suitable for the performance of the inspection requirements specified herein,

31、unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.2 Lot. A lot shall consist of wire of the same si

32、ze, type, condition, and composition, manufactured from the same heat of steel. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-2 1425B 4.3 hmpling. *4,3.1 Sampling for chemical tests. When specified, three samples shall be taken from each heat

33、 for chemical tests, Specimens for chemical analysis shall be in the form of wire clippings, free from oil, dirt, or other foreign material and shall be representative of the full cross section of the wire. (It is preferable that the product check analysis be performed earlier, such as in the rod or

34、 billet stage.) *4.3.2 Sampling for other tests. Five sample coils shall be selected at random from each lot. Specimens shal be taken from one end of each sample coil for tensile, cast (type II and type III, condition B), and wrapping tests. 4.4 Inspection. 4.4.1 Contractors inspection. The contract

35、or shall determine that all wire offered for Government acceptance or delivery conforms to the requirements of the contract and to all applicable documents. 4.5 Tests, 4.5.1 Chemical tests. Chemical tests shall be made in accordance with FED-STD-151, method 1 1 1.2. The samples shall be analyzed for

36、 conformance to 3.2. 4.5.2 Tensile test, Tensile strength tests shall be made in accordance with ASTM A 31 8. The test specimen shall be straight, and the length of the specimen between the jaws of the testing machine shall be not less than 10 inches. Unless otherwise specified, the crosshead speed

37、of the testing machine shall be not less than 1/4 inch per minute and not more than 5 inches per minute. 4.5.3 Wrapping test, Wire small enough to be wrapped by hand may be tested by bending one end of the wire over itself to form a loop with ends crossing at right angles, the shorter end being seve

38、ral inches long, and then tightly winding the longer end five complete turns about the other with turns close together. For larger wire or optionally for wire of any size, the wrapping may be done by any hand or power device which will wrap the wire closely about a mandrel of the required diameter (

39、see 3.7) for five complete turns. The sample shall be considered to have failed if any cracks occur in the wire after the first complete turn, A test shall be repeated if a crack occurs in the first turn (since the wire may be bent locally to a radius less than that specified). 8 Provided by IHSNot

40、for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-ZLq25B 75 m 7779706 OLL7672 3 m MIL-W-21425B *4.5.4 Cast test (type II and type III, condition B). A sample consisting of approximately two full turns of wire carefully cut and removed from a coil shall be placed on

41、 a flat surface and examined for conformance to 3.9. 5. PREPARATION FOR DELIVERY 5.1 Levels of packaging and packing, Material shall be prepared for shipment at the levels specified in procurement documents (see 6.2). 5.1.1 Level A. Level A packaging and packing shall be in accordance with MIL-STD-1

42、63. 5.1.2 Level C. Level C packaging and packing shall be in accordance with commercial practice to insure carrier acceptance for safe delivery at the destination at the lowest rate. As a minimum, the shipment shall meet the requirements of carrier rules and regulations applicable to the mode of tra

43、nsportation. “5.2 Marking. In addition to any marking required by the contract or order, marking shall be in accordance with requirements of MIL-STD-129. 6, NOTES 6.1 Intended use. This specification covers general purpose carbon steel spring wire intended for springs not subjected to severe repeate

44、d stress, Other quality wire, such as music spring wire or valve spring quality wire, should be used where freedom from surface defects and decarburization are required to insure maximum fatigue life for springs operating under repetitive stress. 6.1.1 Type I. The mechanical properties of type I wir

45、e are obtained by heat treatment. Springs formed from type I wire are used without further heat treatment, except for suitable low-temperature treatment to relieve residual stresses caused by coiling. Springs formed from type I wire can generally be held to closer dimensional tolerances than springs

46、 formed from type II wire. 6.1.2 Type II. The mechanicd properties of type II wire are obtained by cold working. Springs formed from type II wire are used without further heat treatment, except for suitable low-temperature treatment to relieve residual stresses caused by coiling. Provided by IHSNot

47、for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-2 1425B 6.1.3 Type III. Type III wire is a soft, spheroidized annealed wire used where springs must be formed of soft wire, Type III, condition A, wire is generally suitable for more severe deformation than type III

48、, condition B, wire. Springs should be heattreated to specified mechanical properties after forming. The composition of type III is the same as type I. 6.2 Ordering data. Procurement documents should specify the following: a, Title, number, and date of this specification b. Type of wire c. For type

49、III wire, the condition (see 1.2). d, Width of wire. e. Quantity of wire. f. Coil size and weight of wire where desired (see 3.10) g. Level of packaging (see section 5). 6.3 Transportation information. Transportation information applicable to this item is as follows: Wire, steel, plain Carload minimum weight 40,000 pounds Motor volume minimum weight 36,000 pounds. 6.4 Wrapping test. Wi