1、This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2014 by Navistar, Inc. JUNE 2014 Page 1 of 1 NAVISTAR, INC. CEMS (CORPORATE ENGINEERING MATERIAL SPECIFIC
2、ATION) NUMBER: CEMS H-1 TITLE: Powdered Metal Iron and Steel Structural Parts CURRENT ISSUE DATE: June 2014 WRITTEN/REVIEWED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES ISSUE OF: August 2008 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION This specif
3、ication may involve hazardous materials, equipment, and procedures. This specification does not purport to address all of the safety issues associated with its use. The user is responsible to consult appropriate safety and health practices and to determine the applicability of regulatory limits prio
4、r to use. Change Notice: Made VOID. This specification is VOID, and has been replaced by MPAPS H-1. For questions, contact MaterialsEngineeringN VOID This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers
5、are required to assume all patent liability. 2014 by Navistar, Inc. JUNE 2014 Page 1 of 1NAVISTAR, INC. CEMS (CORPORATE ENGINEERING MATERIAL SPECIFICATION) NUMBER: CEMS H-1, APPX TITLE: Powdered Metal Iron and Steel Structural Parts - Appendix CURRENT ISSUE DATE: June 2014 WRITTEN/REVIEWED BY: Mater
6、ials Engineering APPROVED BY: Materials Engineering SUPERSEDES ISSUE OF: August 2008 Conventional brazing techniques have little success on porous P/M parts, since the brazing material is absorbed into the pores of the metal. However, FX materials, which are infiltrated with copper, have self-brazin
7、g charac- teristics. Sometimes this property is used to join two parts which cannot be compacted as one piece. Also, parts finished by a coining operation which produces high density and low porosity are suitable for brazing operations. Spot welding, projection welding or any welding method may be u
8、sed with proper attention to the heat affected zone, where embrittlement may cause cracking. Carbon restriction as low as 0.05% max. may be necessary. FINISHING Iron base parts can be given an economical wear and corrosion resistant surface by steam treating or other oxidation processes. A chromizin
9、g treatment for iron P/M parts produces a silver-gray finish which is hard and wear resistant and has improved resistance to corrosion in industrial atmospheres. Commercial plating finishes can be applied to porous parts only after the pores are closed by coining, burnishing, buffing or plastic impr
10、egna- tion. Infiltrated and high density parts are easily plated by standard procedures. Mechanical plating can be used to apply a zinc, cadmium or cadmium-tin coating to P/M parts. IMPREGNATION Parts with a density up to about 6.8 g/cm# can be impregnated with oil or other lubricants to make them s
11、elf- lubricating. Plastic may also be used to fill the pores. The impregnation is done most effectively under vacuum conditions. DEVELOPMENT OF P/M MATERIALS SPECIFICATION Prototype parts must be provided for testing under service conditions to assure PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED
12、 FOR CURRENT REVISION This specification may involve hazardous materials, equipment, and procedures. This specification does not purport to address all of the safety issues associated with its use. The user is responsible to consult appropriate safety and health practices and to determine the applicability of regulatory limits prior to use. Change Notice: Made VOID. This specification is VOID, and has been replaced by MPAPS H-1, APPX. For questions, contact MaterialsEngineeringN VOID
