1、i MIL-I-9bLBZ ME 9999706 01120972 T m MIL-1-46182 (MR) 23 February 1982 MILITARY SPECIFICATION IRON CASTINGS, SPHEROIDAL GRAPHITE (EXTRA TOUGH) This specification is approved for use by the Army Materials and Mechanics Reseach Center, Department of the Army, and is avail- able for use by all Departm
2、ents and Agencies of the Department of Defense. 1. SCOPE 1.1 Scopes. This specification covers the requirements for heat-treated spheroidal graphite iron castings for use where a spheroidal graphite iron (also known as ductile iron and nodular iron) with maximum notch toughness is required (see 6.1)
3、. 2. APPLICABLE DOCUMENTS 2.1 Government .dqcuments. 2.1.1 S,pecif icatipns ,and standar.ds. Unless otherwise specified (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 t
4、he solicitation, form a part of this specification to the extent specified herein. SPECIFICATIONS FEDERAL PPP-B-585 - PPP-B-601 - PPP-B-621 - PPP-(2-843 - MILITARY MIL-P-116 MIL-B-121 MI L-c- 13 2 MIL-L- 10 5 4 7 Boxes, Wood, Wi rebound Boxes, Wood, Cleated-Plywood Boxes, Wood, Nailed and Lock-Corne
5、r Cushioning Mater ia I, Cellulosic Preservation, Methods of Barrier Material, Greaseproofed, Waterproofed, Flexible Crate, Wood, Open: Maximum Capacity 2,500 Pounds Liners, Case, and Sheet, Overwrap; Water-Vaporproof, or Waterproof, Flexible Benef icial comments ( recommendations, additions, deleti
6、ons) and any pertinent data which may he of use in improving this document should be addressed to: Director, US Army Materials and Mechanics Research Center, ATTN: DRXMR-SSS, Watertown, MA O2172 by using the self -addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at th
7、e end of this document or .by ie.tter, , I NO DELIVERABLE DATA REQUIRED BY THIS DOCUMENT / AREA MECA / r THIS DOCUMENT CONTAINS PAGES. 5, Licensed by Information Handling ServicesMIM-4 6182 (MR) STANDARDS FEDEBAL FED. TEST METHOD STD. NO. 151 - Metals, Test Methods MILITARY MIL-STP-10 - Surface Roug
8、hness, Waviness, and Lay MIL-STD-105 ML-STD-i29 - Marking for Shipment and Storage MIL-STD-130 MIGSTD-271 MIL-STD-1188 - Commercial Packing of Supplies and Equipment - Sampling Procedures and Tables for Inspection by Attri- butes - Identification Marking of US Military Property - Nondestructiw Testi
9、ng Requirements for Metals (Copies of specifications and standards required by manufacturers in connec- tion with specific acquisition functions should be obtained from the contract- ing actid-ty or as directed by the contracting officer.) 2.2 Oter_gub2i.a-i.ons. The following documents form a part
10、of this speci- fication to the extent specified herein. The issues of the documents which are indicated as DoD adopted shall be the issue listed in the current DODISS and the supplement thereto, if applicable. ASTM A327 - Impact Testing of Cast Irons AS!M E8 - Tension Testing of Metallic Materials A
11、STM E10 - Brinell Hardness of Metallic Materials, Test for ASTM El86 - Standard Reference Radiographs for Heavy-Walled (2 - 4-l/2 ASTM E446 - Standard Reference Radiographs for Steel Castings Up to 2 imh - 51-114 mm) Steel Castings imhes (51 nun) In Thickness (Application for copies should be addres
12、sed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Industry association specifications and standards are generally available for refereme from libraries. They are also distributed among technical groups and using Federal agencies.) 2.3 Order. of preced
13、ence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specific- ation shall take precedence. 3. REQUIREMENTS 3.1 Matc2ri.al-s .and .pi;9c$ss,. Materials and process shall be such as to pro- duce graphite iron castings conforming to
14、the requirements of this specif ica- t ion. 2 Licensed by Information Handling ServicesMIL-I-Yb182 ME 7777906 0120974 3 MIL-I-46182 (MR) 3.2 Chemical c,ompqsition. Castings shall conform to the chemical require- ments shown in table I. TABLE I. Chemical requirements Silicon (Maximum) Phosphorus (Max
15、imum) Titanium (Maximum) 2.2% O. 05% O. 054 3.3 Mechanical proper,ties. Unless otherwise specif ied in the contract or order (see 6.2) , the mechanical properties of castings in the heat-treated condition shall be as shown in table II. TABLE II. Mechanical properties. Tensile strength psi (minimum)
16、Yield strength 0.2 percent offset psi (minimum) Elongation in 2 inches percent (minimum) 55,000 37,000 20. o Charpy V-notch 20% (-6.7OC) Impact strength 10 f t-lbs (minimum) Brinnel Ha,rdne,ss (maximum) 175 3.4 Corbition. Castinqs shall be furnished in the heat-treated condition (see 6.4). Heat trea
17、tment shall be such as to produce the mechanical proper- ties of 3.3. Heat treatment shall be performed on the whole casting, never on a part only. 3.5 Soundness. Castings shall be of uniform quality, free from shrinks, cold shuts, cracks, harmful porosity, or other defects which would make the cast
18、ing unsuitable for its intended use. Castings shall conform to the speci- fied class of Radiographic Standards for Steel Castings, ASTM E446 and ASTM E186. The area or section of castirQ to be radiographed shall be specified in the drawing, contract or order. 3.6 Curface of castings. Castings shall
19、be sandblasted, grit-blasted, or tumbled after; heat treatment and shall be free from harmful. defects. 3.7 Repairing of defects. Castings shall not be welded, plugged, or repaired in any manner without written permission from the procuring activity. Permission to repair defective castings, when gra
20、ted by the procur- ing activity, shall not relieve the contractor of his responsibility for meet- ing all requirements of the drawings or the specification. 3 Licensed by Information Handling ServicesMIL-f-46182 (MR) 3.8 piflensionq. The responsibility of furnishing castings that can be laid out and
21、 machined to the finished dimensions, within the specified tolerances as shown on the applicable drawings, shall rest with the contractor. Suffic- ient stock shall be allowed for shrinkage and, where required, for finishing; but castings of excessive size or weight shall not be furnished. 3.9 I.de,r
22、dne,ss. .fest+ Sampling of castings for hardness tests , shall be in accordance with the provisions of MIL-STD-105, inspection level II, and acceptance quality level (AQL) 1.5 percent. 4.3.1.4.3.1 When agreed upon by the Government and the contractor, the test specimens selected for tension and impa
23、ct tests may be used for hardness tests. 5 Licensed by Information Handling ServicesMIPI-46182 (MR) 4 , 4 4.4 . 1 4o.k ,clcc,es-tancpi .insgSe.c.tAoq. Yi4qaL ,and .liiqe-ns,iggla. cool in furnace to 1350 - 1275% (732 - 691C) and hold this temperature for 15 to 24 hours: cool in furnace to below 700%
24、 (371OC); the castings may then be cooled in air to Loom temperature, 6.5 Temper embrittiement in nodular. .cas.t i.rons. Some irons covered by this specification, heat treated in accordance with 6.4 are embrittled when given further heat treatment such as stress relieving at temperatures within the
25、 range 742 - 1112% (400 - 6OOOC). Maximum embrittlement is obtained in the temperature range 842 - 932q (450 - 5OO0C). reduce the notch toughness of the iron castings below minimum requirements of this specification. Therefore, for these irons, stress-relief heat treatment should be performed at tem
26、peratures not within the embrittlement temperature range and these irons should not be selected for service where these iron castings are heated in use to temperatures within the embrittlement tempera- tures range. This embrittlement may 6.6 Pr.e$aration .for .delivery .cri.teria. Criteria for use o
27、f the proper level of packaging and packing shall & as follows: 6.6.1 Lew-& A. This level shall be used for those items which are to be shipped to indeterminate destinations or stores under indeterminate conditions f or redistribution anywhere 6.6.2 Leil .i3,. This level shall be used for protection
28、 against damage dur- ing multiple domestic shipments, handling, and covered storage. 6.6.3 LevelC (industri.al). This level shall be used only when it is definitely known that the packaged item is to be shipped to domestic installations for immediate use at the first receiving activity. Custodian : Prepar i ng act i vi ty : Review activity: Project No. MECA-AO91 1 Army - MR Army - AR, CM Army - MR (WP#s DISC 004IA/ID 2062A FOR MC .US.E 0N.L.Y) 12 Licensed by Information Handling Services
