1、MIL-s - 13289E( Em) 20 September SUPERSEDING MIL-S-13281D (MR) 2 May i978 MILITARY SPECIFICATION STEEL, CARBON, ALLOY, AND HIGH STRENGTH LOW ALLOY FOR WELDED STRUCTURES (STRESS RELIEVED) II This specification is approved for use by the Army Materials and Mechanics Research Center, Department of the
2、Army, and is available for use by all Departments and Agencies of the Department of Defense. 3 1. SCOPE 1.1 Scope. This specification covers hot rolled and cold finished carbon, alloy, and high strength low alloy steels in the form of bar, shapes, plate, sheet, and strip intended primarily for use i
3、n welded structures which are to be stress relieved after weldi- (see 6.1). 1.2 Classification. The steel shall be furnished in the form, class, and grade, condition and finish, as specified. 1-2.1 - Form. The steel shall be furnished in the following forms, as specified: Bar, including round, squar
4、e, hexagonal, flat, or bar size shapes, 0 standard structural shapes; plate; sheet; and strip. (see 6.2). 1.2.2 Class and grade. The steel shall be furnished in the following classes and grades, as specified (see 6.2) : Class A - Carbon Steel Class B, Grade 1 - Carbon Steel or High Strength Low Allo
5、y Steel Class B, Grade 2 - High Strength Low Alloy Steel Class C - Alloy Steel Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Director, US Army Materials and Mechanics Research Center, ATTN: AM
6、XMR-SMS, Watertown, MA O2l72-OOOl by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. DISTRIBUTION STATEMENT A Approved for Public Release; Distribution Unlimited. - / THIS DOCUMENT CONTAINS /O PAGES Provided by
7、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-L328lE 95 999990b OlLb363 7 1.2-3 Condition. The steel shall be furnished in one of the following coonditions , as specified (see 6.2) : Hot rolled Cold Finished. Annealed No mal i zed 1.2.4 Finish. The stee
8、l shall be furnished in one of the following conditions as specified (see 6.2) : As hot rolled Descaled Descaled and oiled AS cold finished (cold rolled, cold drawn, machined or polished) 20 APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. Unless otherwise specified
9、 (see 6.2), the following specifications and standards of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DODISS) specified in the solicitation, form a part of this specification to the extent specified herein. STANDARDS FEDERAL FED-STD-48 - Toleran
10、ces for Steel Wrought Products, and for Centrifugally Cast Steel FED-STD-66 - Steel: Chemical Composition and Hardenability FED-STD-151 - Metals: Test Methods MI LI TARY MIL-STD-129 MIL-STD-163 - Marking for Shipment and Storage - Steel Mill products Preparation for Shipment and Storage (Copies of s
11、pecifications, standards, drawings, and publications required by contractors 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
12、 identified, the issue in effect on date of invitation for bids or request for to the extent specified herein. Unless a specific issue is proposal shall apply. 2 O O O Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-L328LE 95 799790b OZlb3b4 7
13、MIL-S-l3281E(MR) AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D 3951 - Practice for Commercial Packaging ASTM E 8 - Tension Testing of Metallic Materials ASTM E 290 - Semi-Guided Bend Test for Ductility of Metallic Materials O (Application for copies should be addressed to the American Soc
14、iety for Testing and Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103. ) (Technical society and technical association specifications and standards J are generally available for reference from libraries. They are also distributed among technical groups and using Federal agencies. ) 2.3 O
15、rder of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specification shall take precedence. 3. REQUIREMENTS 3.1 Chemical composition. Unless otherwise specified in the contract or order, the selection of the chemical co
16、mposition of the steel necessary to meet the requirements of this specification shall be the responsibility of the supplier. To obtain certain combinations of mechanical properties and welding characteristics or compatibility, the purchaser may specify the chemical compostion (see 6.2). 3.1.1 Cast o
17、r heat analysis. A cast or heat analysis of each heat of steel shall be furnished by the supplier showing the percentage of elements specified by the purchaser or declared by the supplier. 3.1.2 Product analysis. When chemical composition is specified (see 3.1), product analysis by the purchaser may
18、 be made on the finished material from each heat of steel subject to the product analysis tolerances of FED-STD-66. 3.2 Mechanical properties. 3.2.1 Tensile. Test specimens representing the steel shall conform to the properties shown in table I, after being stress relieved at the temperatures shown
19、in table I for each class and grade for at least 4 hours followed by furnace cooling to 6000F. (316OC.) or lower. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-n M 4 ?I .rl rl al W 0 ei U W * U W o rl U a a W W U o : 8 I .rl v * al rl rl m L H U
20、al rl P el L U 0 al a C 6“ i2 .rl id d 6 ;?, al E rl N C .r( 8 8 rl U M rl c4 flIL-S-L3281E 95 W 979990b OLL6365 O W MIL-S-l3281E(MR) r.r. dd O0 “ vivi NN nn NUY r.r. 22. vio Ne nn 52 ss O0 UYW nn NN O0 vz 22 4-4 rlrl I Id al 71 * a II 4 vi I-l I I I2 03 d I IVI I Id O N o03 Nd O N . al nn vio e or
21、below the permissible minimum thickness for plates ordered to thickness in inches (mm). (b) For shapes less than 3/8 inch (9.53mm) in nominal thickness, no more than 1/32 inch (0.79mm). 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-L32LE 75
22、 777970b OLlib3b7 4 I MIL-S- 13281E( MR) (c) For shapes over 3/8 inch (9.53mm) in nominal .thickness, no more than 1/16 inch (1.59mm). (1.59mm) deep, they can be removed, provided: The cross-sectional area of the piece at any location is not reduced by more than 1.5 percent; nor the total area of th
23、e chipped surface of the piece exceed 2 percent of the total surface area; and after any imperfection has been removed, the maximum depth of depression should not exceed 20 percent of the nominal thickness of the section. When the imperfections are more than 1/16 inch (a), The toes of angles, beams,
24、 channels and zees and the stems and toes of tees may be conditioned by grinding or chipping and welding. Prior to welding, the depth of depression, measured from the toe inward, shall be limited to the thickness of the material at the base of the depression, with a maximum depth limit of 1/2 inch (
25、12.7mm). (e) When repair is performed, the welds must be sound and the weld metal thoroughly fused on all surfaces and edges without undercut or overlap. The weld metal should project at least 1/16 inch (1.5%) above the rolled surface, and the projecting metal should be removed by grinding or chippi
26、ng and grinding to make it flush with the rolled surface. 3.7 Workmanship. as laminations, segregation and surface defects as is consistent with good commercial practice. The steel shall be clean and free of imperfections such 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless
27、 otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or order, the contractor may use his own or any other facilities suitable for the performance of
28、 the inspection requirements specified herein, 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
29、- Lot. Unless otherwise specified in the contract or order (see 6.2), a lot shall consist of all steel submitted for inspection at one time, of the same heat and same form, and if heat treated, subjected to the same heat treatment procedure. 4.3 Sampling. 4.3.1 Product analysis. When chemical compos
30、ition is specified (see 3.i), at least one sample shall be taken for chemical analysis. Sampling procedures shall be in accordance with FED-STD-66. furnish chips or drillings from the test specimens of the tensile test. When requested, the contractor shall -6 Provided by IHSNot for ResaleNo reproduc
31、tion or networking permitted without license from IHS-,-,-t - _. MIL-S-L32LE 75 W 9799706 0336368 6 W MIL-S- 13281E(MR) 4.3.2 Tensile test. Two test samples shall be taken from each lot, unless a the lot is less than 30 tons (27.2 metric tons) then one sample shall be taken. If one lot of steel is p
32、rocessed into more than one thichess. of a- particular form, and the thickness differs by 3/8 in. (9.5 mm) or more, one tensile test sample shall be taken from the thickest and thinnest material in the lot. Test specimens for material wider than 24 inches (600mm) shall be taken transversely. Test sp
33、ecimens for all other material shall be taken longitudinally. Location of sample shall be in accordance with table III. TABLE III. Location of tensile test specimens 1 Product diameter Location of Product or thickness test specimen axis a Round bars Under 1-1/2 inches (38*lm) Flat sections Under 1-1
34、/2 inches (38*1m Coincidence with central longitudinal axis of piece Midway between the flat surfaces (full thickness of material) Flat sections Over twice the greatest Midway between the center diameter or width of test and the edge of the specimen used section All Over 1-1/2 inches ( 38- b) One-fo
35、urth the diameter or thickness from the surface of the piece 4.3.3 Bend test. When cold bending properties are specified (see 6.2), the test samples shall be taken longitudinally and the number of samples shall be the same as for tensile testing (see 4.3.2). 4.3.4 Weldability tests. Sampling for wel
36、dability test and the number of samples shall be as agreed upon between the contractor and procuring activity (see 6.2). 4.4 Examination. 4.4.1 Visual and dimensional. A representative sampling of the steel shall be examined for compliance with the requirements for finish (1.2.4) identification mark
37、ing (3.5), and workmanship (3.7), and shall be measured for compliance with the requirements for dimensions (3.4) and conditioning (3.6). 4.4.2 Packaging. Pri.or to shipment, examination shall be made to determine compliance with the requirements of section 5. 4.5 Tests. 7 Provided by IHSNot for Res
38、aleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-l3281E( MR) 4.5.1 Test specimens. 4.5.1.1 Chemical composition. Specimens for chemical analysis shall be prepared in accordance with method 111 or 112 of FED-STD-151 for the applicable procedure. 4.5.1.2 Mechanical propert
39、ies. 4.5.1.2.1 Tensile properties. Specimens shall be prepared in accordance with ASTM E 8 and stress relieved as specified in 3.2.1 before testing. 4.5.1.2.2 Cold bending. When specified (see 6.2), specimens for cold bending shall be taken from a location midway between the center and the edge of t
40、he section being tested. 4.5.1.3 Weldability. Specimens for the weldability test shall be prepared as specified in the contract or order (see 6.2). 4.5.2 Test methods. 4.5.2.1 Chemical composition. Chemical composition shall be conducted in accordance with method 111 or 112 of FED-STD-151. 4.5.2.2 M
41、echanical properties. 4.5.2.2.1 Tensile tests. Tensile tests shall be conducted in accordance with ASTM E 8. 45.2.2.1.1 Yield strength. The yield strength shall be determined by either the offset method or the extension-under-load method as described in ASTM E 8. For the offset method, the set shall
42、 be 0.2 percent 0.002 in./in. (0.051/25.4 mm) of gage length). The limiting extension for the extension-under-load method is shown in table IV. TABLE IV. Extension-under-load testing Yield strength, ksi (MPa) Limiting extension under load - in./in. (mm/mm) of gage 0.0028 (0.0711) .O033 ( .0838) 25 (
43、172) 40 (276) 45 (310) .O035 ( -0889) 50 (345) 00037 ( -0940) 70 (483) -0043 ( -1092) 4.5.2.2.2 Bend test. When specified (see 6.2), cold bend test shall be performed in accordance with ASTM E 290. room temperature, in a vise or press through an angle of 180 degrees over the pin diameter specified i
44、n 3.2.2. The steel shall be bent slowly, at 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-S-L32LE 75 9747706 OLL6370 4 I F I I i I I h t MIL-S- 13281E (MR ) 4.5.2.3 Weldability test Weldability test shall be conducted as specified by the pro
45、curing activity (see 6.2). 4.6 Rejection. 4.6.1 Examination. If representative sampling for visual, dimensional or packaging fails to meet with the requirements of this specification when examined in accordance with 4.4, the lot shall be rejected, 4.6.2 Tests. If a test specimen fails to meet any of
46、 athe requirements of this specification, the lot represented by the specimen shall be rejected when tested in accordance with 4.5. 4.6.3 Retests. Retests shall be permitted in accordance with FED-STD-151. 5. PACKAGING 5.1 Preservation-packaging. Preservation-packaging shall be level A or C, as spec
47、ified (see 6.2). 5.1.1 Level Ag Material shall be packed in accordance with the requirements of MIL-STD-163. 5.1.2 Level C. Material shall be packed in accordance,with ASTM D 3951. 5.2 Packing. Unless otherwise specified in the contract or order, packing shall be level C (see 6.2). 5.2.1 Level C. Ma
48、terial shall be packed for shipment in such a manner as to insure acceptance and safe delivery in accordance with ASTM D 3951. 5.3 Marking for shipment. In addition to any special marking specified in the contract or order (see 6-21, marking for shipment shall be in accordance with the requirements
49、of MIL-STD-129 or ASTM D 3951, as applicable. 6. NOTES 6.1 Intended use. The hot rolled carbon, alloy, and high strength low alloy steels purchased under thi-s, specification are intended primarily for use in welded structures which are to be stress-relieved after welding. The classes and grades are limited to those shown in 1.2.2 with the mechanical properties and welding characteristics indicated in 3.2 and 3.3, respectively. The steel
