1、NAVISTAR, INC. CEMS (CORPORATE ENGINEERING MATERIAL SPECIFICATION) NUMBER: CEMS H-1 TITLE: Powdered Metal Iron And Steel Structural Parts CURRENT ISSUE DATE: August 2008 WRITTEN/REVIEWED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES ISSUE OF: April 2002 PRINTED COPIES OF TH
2、IS DOCUMENT MUST BE VERIFIED 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
3、 and to determine the applicability of regulatory limits prior to use. Change Notice: Replaced “International Truck and Engine Corporation” with “Navistar, Inc.” per corporate directive; added CEMS B-50 requirement; corrected Table I hardness for FC-0208-60; editorial changes. 1.0 SCOPE This specifi
4、cation covers the Corporations requirements for structural parts produced from ferrous metal powders. The term “P/M parts” is used throughout this specification as the designation for powdered metal parts. Note: Requirements for powdered metal bearings, bushings and nonferrous metal parts are covere
5、d in CEMS C-5, Bearing and Bushing Alloys. 1.1 Restricted Chemical SubstancesEffective January 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the CEMS B-50 specification. 2.0 INTRODUCTION P/M structural parts covered herein refer to machi
6、ne components whose load carrying capability, strength, and density are the major design factors. Low to medium density parts, in which porosity and self-lubrication are paramount, are classified as porous sintered metal bearings and are covered separately in CEMS C-5. For applications involving com
7、bined functions such as structural and self-lubrication or wear, a Materials Engineer should be consulted. 2.1 Part Development And Specification (Structural Application) 2.1.1 A complete material specification for a P/M part cannot be written at the proposal stage. The engineer must refer to the de
8、sign guide in “Appendix - General Information” for detailed recommendations regarding the development of an effective material specification. 2.1.2 The design engineer should make a tentative material choice in cooperation with a P/M parts supplier and/or Materials Engineer using the materials liste
9、d in Table I. This table, based upon MPIF Standard 35, describes materials in terms of composition and strength. Since limits for the other mechanical properties cannot initially be specified, some typical mechanical properties for test bars are shown in “Appendix - General Information” as a guide.
10、Additional mechanical properties and design information are found in other MPIF or ASTM specifications. See “Mechanical Property equirements”, Section 6.2. RThis document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Sup
11、pliers are required to assume all patent liability. 2008 by Navistar, Inc. AUGUST 2008 Page 1 of 8 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: TITLE: CURRENT ISSUE DAT
12、E: CEMS H-1 Powdered Metal Iron And Steel Structural Parts AUGUST 2008 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. 2008 by Navistar, Inc. 2.1.3 Proto
13、type parts will be “de-rated” to assist in the development of minimum engineering properties for the specification of the proposed parts. In some cases, the de-rating will be done by specifying prototype parts with a lower strength value than the minimum specified for production parts. In other case
14、s, the de-rating will be done by specifying prototype material density lower than the minimum proposed for production parts. 3.0 CONTENTS PAGE REFERENCE DOCUMENTS 2 CLASSIFICATION 2 GENERAL REQUIREMENTS 2 QUALITY 3 SOURCE APPROVAL AND QUALITY CONTROL 4 DESIGNATION ON DRAWINGS AND PURCHASE ORDERS 4 P
15、ACKING AND SHIPPING 5 APPROVED SOURCES 5 4.0 REFERENCE DOCUMENTS Unless otherwise specified, the latest issue of all referenced standards shall apply. The following standards, specifications and regulations are referenced in this specification. Quality System Standard ISO 9001 or TS-16949 NAVISTAR C
16、EMS B-50 CFR Title 29, Part 1910 MPIF Standard 35 NAVISTAR Manufacturing Standard MS-D-13 MPIF Standard 40 NAVISTAR CEMS C-5 MPIF Standard 41 NAVISTAR CEMS HT-1 ASTM B 328 5.0 CLASSIFICATION Materials are classified by chemical composition and minimum strength. 6.0 GENERAL REQUIREMENTS Materials pur
17、chased to this specification will be identified, as shown in Table I, by a material designation code which is based on the Metal Powder Industries Federation (MPIF) system. Codes are based on chemistry and are further classified by strength factors using suffix letters. The prefix letters F, FC, FD,
18、 FL, FN, and FX designate carbon and alloy steels, and prefix letters SS designate stainless steels. The four digit numbers in the carbon and alloy steel (F) series indicate the amounts of carbon and major alloying elements. The three digit numbers in the stainless steel series (SS) indicate the typ
19、e of stainless steel. The suffix letters indicate the minimum yield strength value in the as-sintered condition or the minimum tensile strength value in the heat treated condition. Prototype parts must comply with the appropriate requirements listed in Section 7.1, “Qualification”. 6.1 New Materials
20、New or other P/M materials not included in Table I, for which the MPIF has assigned a material code, will be identified by that code. Refer to the latest issue of MPIF Standard 35. AUGUST 2008 Page 2 of 8 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for R
21、esaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: TITLE: CURRENT ISSUE DATE: CEMS H-1 Powdered Metal Iron And Steel Structural Parts AUGUST 2008 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Tech
22、nical Standards. Suppliers are required to assume all patent liability. 2008 by Navistar, Inc. 6.2 Mechanical Properties The properties of sintered metal parts cannot be readily evaluated and checked. Therefore, it is necessary that performance tests on prototype parts be supplemented by controlled
23、tests made in the laboratory to establish minimum acceptable mechanical property requirements of the parts. These tests will be completely described on the drawing* in terms of the test method, minimum load requirements, location of load application, or other test limits as necessary. *Common practi
24、ce is to specify a minimum crush load or breaking strength on the drawing for each part. 6.3 Impregnation Impregnation is prohibited unless it is specified on the drawing. No oil of any kind for any purpose will be permitted unless specified on the engineering drawing. When impregnation is required,
25、 only the vacuum method will be allowed and the impregnant (oil) will be identified on the drawing. 6.4 Dimensional TolerancesThe dimensions will be within limits for commercial practice of the P/M industry. Dimensional tolerances, when critical, will be specified on the drawing. Specific tolerances
26、 are subject to agreement between the purchaser and the supplier. 6.5 InspectionThe inspection of P/M parts involves the performance of all material property tests described herein and those tests described on the engineering drawing, as well as inspection for size and shape. Sampling details will b
27、e as agreed upon by the purchaser and supplier. 7.0 QUALITY Parts will be clean and free from scale, defects, flaws or any condition that would adversely affect performance. 7.1 Qualification Production material can be furnished under this specification only after engineering qualification unless wa
28、ived by the controlling engineering department. When requested by the appropriate purchasing department, the supplier will be required to furnish prototype samples to the controlling engineering department. The density of prototype parts will be 0.1 + 0.03 g/cm3lower than the minimum for the range s
29、pecified, unless otherwise specified. The prototype parts will be individually identified and will be accompanied by the following information. 7.1.1 Certification that all dimensions of each part are as specified. 7.1.2 Total weight of each part. 7.1.3 Actual density of each part. 7.1.4 Apparent ha
30、rdness of each part. 7.1.5 Total weight, break strength, microstructure and chemical composition for each of five (5) randomly selected parts representing the shipment. 7.1.6 Results of all tests specified on the drawing. 7.2 Whenever possible, prototype parts will be processed with production dies.
31、 Where high cost makes this impractical, the controlling engineering department may approve the testing of prototype parts machined from P/M slugs. Final approval will be granted only after receipt of acceptable production parts. AUGUST 2008 Page 3 of 8 Copyright Navistar International Corporation P
32、rovided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: TITLE: CURRENT ISSUE DATE: CEMS H-1 Powdered Metal Iron And Steel Structural Parts AUGUST 2008 This document is restricted and may not be sent outside Navistar, Inc. or
33、reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2008 by Navistar, Inc. 7.3 After final qualification of prototype parts, the engineering drawings parts should be reviewed to determine if any changes are necessary. 7.3.1 Confirm
34、 the description of the production material, including the identification of impregnation material if used, is correct 7.3.2 Add all specialized inspection requirements such as fracture tests, density, hardness and microstructure, with critical locations for testing indicated on the drawings 7.3.3 I
35、nclude a detailed description of necessary test fixtures. 7.3.4 Any change in formulation or processing will require engineering approval. 8.0 METHODS OF TEST 8.1 Density Test per ASTM B 328. For complex shapes with possible density variations, the section to be inspected will be designated on the e
36、ngineering drawing. 8.2 Hardness The reported apparent hardness will be an average of not less than six individual readings. 8.3 Special Tests Radial Crush, Gear Tooth Fracture, Transverse Fracture - Conduct these tests according to CEMS Test Method HT-1. For any other special test, see the engineer
37、ing drawing. 9.0 SOURCE APPROVAL AND QUALITY CONTROL 9.1 Supplier Requirements All suppliers to NAVISTAR are required to be registered to ISO 9001 Quality System Requirements. NAVISTAR will also accept TS-16949 registration as long as the supplier can also fulfill all AIAG PPAP (Production Part Appr
38、oval Process) documentation and approval requirements. Suppliers must maintain their certification with an accredited registrar and must furnish copies of registration certificates to their Corporate Buyer upon request. 9.2 ApprovalParts supplied against contracts or purchase orders citing this spec
39、ification shall be equivalent in all respects to those samples which were approved by the purchaser. No changes in formulation or processing practices are permitted without approval. In the event that changes in material, properties, processing practices, construction, color, or labeling of the prod
40、uct are required, the supplier shall notify Materials Engineering at TDTC and NAVISTAR Purchasing and Supplier Development of the proposed change(s). Test data indicating conformance to all requirements of this specification, test samples, and new or amended or updated Material Safety Data Sheet(s)
41、(MSDS), in accordance with CFR Title 29, Part 1910 shall be submitted with the request for change. 9.3 Process ControlThe supplier shall either perform and report results of tests on specific lots of parts produced using ISO 9001 or TS-16949 guidelines, or provide statistical evidence of the lot hav
42、ing been produced in a state of statistical control and with a process capable of providing all required properties. The part supplier and the plant metallurgist and/or the quality control manager of the using NAVISTAR plant may determine testing and reporting requirements on specific products. AUGU
43、ST 2008 Page 4 of 8 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: TITLE: CURRENT ISSUE DATE: CEMS H-1 Powdered Metal Iron And Steel Structural Parts AUGUST 2008 This doc
44、ument 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. 2008 by Navistar, Inc. 10.0 DESIGNATION ON DRAWINGS Material designation on drawings will include the material de
45、signation code, break strength and any other specific requirements not included in this specification. Examples: F-0000-15 CEMS H-1, Min Apparent Hardness RF40 Radial Crush Strength - 350 lbf (1.6 kN) min, vacuum impregnate with _oil. FN-0200-25 CEMS H-1, Carburize - Surface File Hard Fracture Stren
46、gth 9500 lbf (42.3 kN) min tested as shown. FN-0208-130HT CEMS H-1, Min Apparent Hardness RC 35, Min Part Weight - 180 g Microstructure will be essentially uniform tempered martensite. Fracture Strength 4000 lbf (17.8 kN) min tested as shown. 11.0 PACKING, SHIPPING AND IDENTIFICATION Packing, shippi
47、ng and identification shall be in accordance with Manufacturing Standard MS-D-13. Parts will be packaged in such a manner as to prevent damage or corrosion in transportation and handling. Packaging of oil-impregnated parts will insure that the oil is not absorbed from the parts. 12.0 APPROVED SOURCE
48、S 12.1 When a prototype development program results in successful parts, the supplier of these parts will be shown on the drawing as the approved source. Additional sources will be considered only after they have submitted satisfactory production parts that have been tested and approved by the controlling engineering department. 12.2 The purchasing department will consult with the controlling engineering department before purchasing parts from a supplier not listed on the drawing as an approved source. 13.0 TECHNICAL INFORMA
