1、I INCH - POUND I MIL-S-46850D 22 March 1991 SUPERSEDING MIL-S-46850C (MI) 30 September 1986 MILITARY SPECIFICATION STEEL: BAR, PLATE, SHEET, STRIP, FORGINGS, AND EXTRUSIONS, 18 PERCENT NICKEL ALLOY, MARAGING, 200 KSI, 250 KSI, 300 KSI, AND 350 KSI, HIGH QUALITY This specification is approved for use
2、 by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers steel bars, plate, sheet, strip, forgings and extrusions containing 18 percent nickel and capable of attaining high ultimate tensile properties by means of a relatively low temperature heat t
3、reating process. 1.2 Classification. The steels covered in this specification are classified by type and grade as follows (see 3.1 and 6.2). Type Type I - Air arc melted (AM) steel. This steel shall be produced by basic air melting. Type II - Vacuum degassed (W) steel. This steel shall be produced b
4、y the vacuum degassing process. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, U.S. Army Missile Command, ATTN: AMSMI-RD-SE-TD- ST, Redstone Arsenal, AL 35898-5270 by using the Stand
5、ardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 9515 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IH
6、S-,-,-MIL-S-46850D Type III - Vacuum arc remelt (VAR) steel. This steel shall be produced by multiple melting using the vacuum consumable electrode process in the final remelt cycle. (VIM/VAR). This steel shall be produced by multiple melting using the vacuum induction melt to make the vacuum arc co
7、nsumable electrode for the final remelt cycle. Type IV - Vacuum induction melt, vacuum arc remelt The specific grades of mill product covered by this specification are as follows : Grade 200 -200 ksi nominal tensile strength 250 -250 ksi nominal tensile strength 300 -300 ksi nominal tensile strength
8、 300A -300 ksi nominal tensile strength 350 -350 ksi nominal tensile strength NOTE: ksi = 1000 pounds per square inch 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document
9、to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2) . STANDARD S FEDERAL FED-STD-48 FED-STD-151
10、FED-STD-183 MILITARY MIL-STD-129 MIL-STD-163 Tolerances for Steel Wrought Products, and for Centrifugally Cast Steel Metals: Test Methods Continuous Identification Marking of Iron and Steel Products Marking for Shipment and Storage Steel Mill Products Preparation for Shipment and Storage 2 Provided
11、by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-46850D MIL-STD-414 - Sampling Procedures and Tables for Inspection by Variables for Percent Defective (Unless otherwise indicated, copies of the federal and military specifications, standards, and handbook
12、s are available from the Naval Publications and Forms Center, Standardization Documents Order Desk, Bldg. 4D, 700 Robbins Ave., Philadelphia, PA 19111-5094.) 2.2 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specifi
13、ed, the issues of the documents which are DoD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING
14、AND MATERIALS (ASTM) ASTM A 700 ASTM E 8 ASTM E 10 ASTM E 18 ASTM E 23 ASTM E 45 ASTM E 92 ASTM E 112 ASTM E 140 ASTM E 381 ASTM E 399 - Packaging, Marking, and Loading Methods for Steel Products for Domestic Shipment, Standard Practices for (Metric), Standard Test Methods for Standard Test Method f
15、or Hardness of Metallic Materials, Standard Test Methods for Materials, Standard Test Methods for Steel, Standard Practice for Standard Test Methods for Test Methods for Metals Steel Products, Comprising Bars, Billets, Blooms, and Forgings, Standard Method of Metallic Materials, Standard Test Method
16、 of - Tension Testing of Metallic Materials - Brinell Hardness of Metallic Materials, - Rockwell Hardness and Rockwell Superficial - Notched Bar Impact Testing of Metallic - Determining the Inclusion Content of - Vickers Hardness of Metallic Materials, - Determining Average Grain Size, Standard - St
17、andard Hardness Conversion Tables for - Macroetch Testing, Inspection, and Rating - Plane-Strain Fracture Toughness of (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) 3 Provided by IHSNot for ResaleNo reproduct
18、ion or networking permitted without license from IHS-,-,-MIL-S-46850D AEROSPACE MATERIAL SPECIFICATIONS (AMs) AMs 2300 - Premium Aircraft - Quality Steel Cleanliness - Magnetic Particle Inspection Procedure AMs 2310 - Qualification Sampling of Steels, AMs 2808 - Identification, Forgings Transverse T
19、ensile Properties (Application for copies should be addressed to the Society of Automotive Engineers, 400 Commonwealth Drive, Warrendale, PA 15096.) (Non-Government standards and other publications are normally available from the organizations that prepare or distribute the documents. These document
20、s also 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 applicabl
21、e laws and regulations unless a specific exemption has been obtained. 3. PiEQUIREMENTS 3.1 Material (see 1.2). Mill products shall be manufactured by the air arc melted (AM) process, vacuum degassed (W) process, vacuum arc remelt (VAR) process, or the Vacuum Induction Melt, Vacuum Arc Remelt (VIM/VA
22、R) process as specified. Sufficient discard shall be taken from each ingot to insure freedom from piping and undue segregation. 3.2 Material conditions. Unless otherwise specified, the material shall be furnished in the solution-annealed (A), descaled, and oiled condition. Solution annealing shall b
23、e accomplished by heating at 816 5 5OC for 1 hour per inch of thickness, followed by air cooling to room temperature (see 6.4) . If required (see 6.2), the surface condition shall be (1) as forged or rolled, (2) pickled, (3) ground or blast cleaned, (4) cold finished or (5) ground and polished. 3.3
24、Chemical composition. 3.3.1 Chemical composition (percent by weight). The chemical composition of bar, plate, sheet, strip, forgings and extrusions shall be as specified in table I. Individual determinations may vary from the specified range to the extent shown in the product analysis column except
25、that the elements in any melt shall not vary above and below the specified range. 3.3.2 Melt analysis. The contractor shall furnish an analysis of the melt of each lot showing the percentage of each of the elements designated in table I. 4 Provided by IHSNot for ResaleNo reproduction or networking p
26、ermitted without license from IHS-,-,-rno Ln Ba, rlld a rl& 4(3 R“ moolnmomcJoo ln “(v ddd000Q000 0000000000 +1+1+1+1+1+ + + + + ln55!3 OlncJWd E E a“md0 x x x -4 -4 dd IdIda I ccx . 1111 omwmoorld mm00 I E 4 li a m wd.=rdoooooo dd m55 -5 -4 122 0ln“cod E (TIQIOO x x . d IlII mm0 omwmood Odd doo co0
27、30000000 rl a, o C II li Id m IzPw0000000 d I a, o 4 rl m Id ammo0 & d . I I9 I a, o C Id rl III lnlnmoodd I 000d00d400 m Izcomooooooo rl a, m rn c, rn a, d rlc wo U H fi 5 moo 0cJm O00 . O00 moo O00 0cJm . O00 moo 0“V) O00 . O00 moo O00 0“m O00 . 5 -2 5 c o -ri OU0 & Ud o -4 Id NU Provided by IHSNo
28、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-46850D 3.4 Hardness of annealed steel. The hardness of solution-annealed steel shall not be higher than Rockwell C32 or equivalent for grade 200, Rockwell C34 or equivalent for grade 250, Rockwell C36 or equivalen
29、t for grade 300 and 300A, or Rockwell C38 or equivalent for grade 350 material. 3.5 Response to heat treatment. Grades 200, 250, 300, and 300A, when received in the solution annealed condition, shall conform to the following requirements for mechanical properties after aging for 3 to 6 hours 2 10 mi
30、nutes at 482 & 5OC followed by air cooling to room temperature (see 6.4). Grade 350, when received in the solution annealed condition, shall conform to the following mechanical properties after aging at 510 2 5OC for 3 to 6 hours - + 10 minutes followed by air cooling to room temperature (see 6.4).
31、3.5.1 Mechanical properties. Except for fracture toughness properties and impact (see 3.5.3), the mechanical properties of maraged bar, plate, forgings and extrusion products shall conform to table II. Except for fracture toughness properties and impact (see 3.5.3), the mechanical properties of mara
32、ged sheet and strip products shall conform to table III. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-S-46850D 95 M 9999706 0468954 3 M MIL-S-46850D H H O Cr) Cr) O Co hl O hl -r O O hl hl 2 Co N Co hl “d ln O U) O U) O Co O N I c A .yu 9 -
33、4 - O a3 Cr) O oc LI O0 PC - -ri 05 c c,& .-ix &W mu 7 W hl I4 hl r( v) r( U) hl a .-i -4 m LI a, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-46850D TABLE III. Longitudinal mechanical properties of sheet and strip products. L/ Mechanical Pr
34、operties Types I, II, III, and IV Grade 200 Grade 250 Grade 300 Grade 350 I I I I Tensile yield strength (ksi) at not less than O. 2 percent offset 200 240 280 330 Elongation, in 2 inches, minimum percent Under O. loo“ nominal thickness 4.0 3.0 2.0 1.0 O .100“ to O .380“ thickness 5.0 4.0 3.0 1.8 -
35、1/ Tensile bars shall be taken parallel to the primary working direction of the material. 3.5.2 Hardness of maraged steel. The hardness of material maraged in accordance with 3.5 shall not be lower than Rockwell C42 or equivalent for Grade 200 material, Rockwell C48 or equivalent for Grade 250 mater
36、ial, Rockwell C52 or equivalent for Grade 300 and 300A material, or Rockwell C56 or equivalent for Grade 350 material. Failure to meet the hardness requirement shall be cause for rejection. 3.5.3 Fracture toughness. The plane strain fracture parameter (KIc) shall be determined from each steel suppli
37、ers mill lot of material which has been heat treated in accordance with paragraph 3.5. The fracture toughness parameter requirements shall be not less than the following: GRADE KIc (ksi - in 1/2) 200 250 300 & 300A 350 100 75 60 25 3.5.4 Transverse mechanical properties. If required (see 6.2) mill p
38、roducts are of sufficient size to allow long transverse propert determination, measurements shall be made in accordance with ASTM E 8 the requirements of AMs 2310 for premium quality steels. These long transverse mechanical properties shall be not less than 90 percent of , and ies and with those spe
39、cified in tables II and III. Long transverse is the direction which is perpendicular to both the longitudinal (the direction of maximum extension during rolling) and the short transverse (the direction of maximum contraction during rolling) directions. 8 Provided by IHSNot for ResaleNo reproduction
40、or networking permitted without license from IHS-,-,-b “J-L-s-YLOD 95 m 99999Ob 04b895b 7 m MIL-S-46850D 3.6 Grain size. 3.6.1 Grade 200 material (Types I, II, III and IV). In accordance with the applicable ASTM E 112 chart, the grain size shall be predominantly five or finer with grains as large as
41、 three permissible provided all are not found in a continuous band or localized area within the material. 3.6.2 Grade 250 material (Type I, II, III and IV). The grain size of sheet material shall be predominantly six or finer with grains as large as four permissible in accordance with the applicable
42、 ASTM E 112 chart. The grain size of plate material up to 0.625 inches in thickness shall be predominantly five or finer with occasional grains as large as three permissible. The grain size of plate material over 0.625 inches thick and all bar material shall be subjected to negotiation with the manu
43、facturer. 3.6.3 Grade 300 and 300A material (Type I, II, III and IV). The grain size of this material for all sizes shall be predominantly six or finer with grains as large as four permissible in accordance with the applicable ASTM E 112 chart. 3.6.4 Grade 350 material (Type I, II, III and IV). The
44、grain size of this material for all sizes shall be predominantly six or finer with grains as large as four permissible in accordance with the applicable ASTM E 112 chart. 3.7 Macrograph standards. If required (see 6.2), the macrograph standard of bars, plates, billets and slabs made from type I and
45、II material shall be equal to or better than S2, R2 and C2 of ASTM E 381. 3.8 Inclusion content. The size and frequency of inclusions in type I, II, III and IV material shall not exceed the Jernkontoret limits specified in tables IV, V, VI and VI1 for grades 200, 250, 300, 300A and 350 respectively.
46、 I TABLE IV. Inclusion rating of grade 200 material. Type E* D C B A Thin Series 2.5 2.0 1.5 1.5 1.5 Thick Series 3.5 2.5 2.0 2.5 2.0 * Type E are titanium nitrides and shall be rated by the same method as Type B. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license
47、 from IHS-,-,-I MIL-S-46850D 95 E 9999906 0468957 9 = MIL-S-46850D TABLE V. Inclusion rating of grade 250 material. Type E* D C B A Thin Series 3.0 2.5 1.5 2.0 2.0 Thick Series 2.0 2.0 1.0 1.5 1.5 * Type E are titanium nitrides and shall be rated by the same method as Type B. TABLE VI. Inclusion rat
48、ing of grade 300 and 300A material. * Type E are titanium nitrides and shall be rated by the same method as Type B. TABLE VII. Inclusion rating of grade 350 material. * Type E are titanium nitrides and shall be rated by the same method as Type B. 3.9 Tolerances. Tolerances shall conform to the appli
49、cable limits of FED-STD-48. 3.10 Identification. Each bar, plate, sheet, strip, or extrusion shall be identified in accordance with FED-STD-183. The marking shall include the heat number, composition designation, physical condition and this specification designation. Each forging shall be identified by ink marking in accordance with AMs 2808. 3.11 Workmanship. The bar, plate, sheet, st
