1、MIL-S-BL593 (3) ME = 9999906 0322873 3 W MIL-S-81591 AMENDMENT 3 31 January 1983 SUPERSEDING AMENDMENT 2 18 December 1981 MILITARY SPECIFICATION STEEL, INVESTMENT CASTINGS, CARBON AND CORROSION-RESISTING This amendment forms a part of Military Specification MIL-S-81591, dated 9 September 1968, and i
2、s approved for use by all Departments and Agencies of the Department of Defense. PAGE 2 * Table Ia, Add “IC-416“ in its numerical order under Composition number and add under Conditions “Annealed or quenched and tempered.“ Delete “IC-322a“ and substitute “IC-17-4.“ 1 PAGE 5 * Table IIa, under Compos
3、ition number IC-303, delete chemical requirements and substitute the following: “Carbon - 0.16 1/, Manganese - 1.50, Silicon - 2.00, Nickel - 9.0-12.0, Chromium - 18.0-21.0, Copper - 0.5 and either (a) or (b). - (a) Molybdenum - 1.5, Phosphorus - 0.17, Sulfur - 0.04, (b) Molybdenum - 0.40-0.80, Phos
4、phorus - 0.040, Sulfur - 0.20-0.40 *) Selenium - 0.20-0.35 Table IIa, add Composition number “IC-416“ and include the following chemical requirements “Carbon - 0.15 1/, Manganese - 1.25, Silicon - 1.50, Nickel - 0.50, Chromium - 11.5-14.0, Rolybdenum - 0.50, Copper - 0.50, Zirconium - 0.50, and eith
5、er (a) or (b). (a) Selenium - 0.10-0.30, Phosphorous - 0.040, Sulfur - 0.03 (b) Phosphorous - 0.050, Sulfur - 0.15-0.35 l/ Elements expressed in maximum weight percentage unless otherwise indicated.“ Table IIa, footnote - 2/, delete “maz“ and substitute “max.“ PAGE 7 * Table IIIa, add Composition nu
6、mber “IC-416“ and include the following: “Annealed C25 max. AREA MCCA 1 of 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-WIL-S-BL571 (3) WE m 9977706 0122872 3 W MIL-S-81591 AMENDMENT 3 Minimum Prdperties of Test bar - li Quenched Hardness Yield
7、Tensile % Reduction % Elong. & Tempered of Strength Strength of Area - l/ For critical applications, relation of test bar values to properties of castings should be established by actual test. - 2/ At O. 2% offset .II PAGE 13 6.1.2, 1st Line. Add “IC-416“ after “IC-410.“ 6.1.2. Add in this paragraph
8、 “Composition No. IC-416 is intended for small parts for use at temperatures up to lOOOoF (538oC). Corrosion resistance is lower than that of IC-410 but machinabi 1 i ty is better.“ The margins of this amendment are marked with an asterisk to indicate where changes (additions, modifications, correct
9、ions, deletions) from the previous amendment were made. This was done as a convenience only and the government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irre
10、spective of the marginal notations and relationship to the last previous amendment. Custodians: Navy - AS Air Force - 99 Atmy - AR Sr US GOVERNMENT PRINTING OFFICE: 1983 O - b05 1U.l h94 2 Review activities: Army - AV, ME, MI Navy - MC User activities: Navy - OS Preparing activity: Navy - AS (Project No. MECA-0239) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
