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. 2008 by Navistar, Inc. AUGUST 2008 Page 1 of 13 NAVISTAR, INC. CEMS (CORPORATE ENGINEERING MATERIAL SPECI
2、FICATION) NUMBER: CEMS E-2 TITLE: Steel Castings CURRENT ISSUE DATE: August 2008 WRITTEN/REVIEWED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES ISSUE OF: February 2002 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION This specification may involve hazar
3、dous 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:
4、Replaced “International Truck and Engine Corporation” with “Navistar, Inc.” per corporate directive; added CEMS B-50 requirement; updated reference documents; corrected Table I; updated Table III; editorial changes. 1.0 SCOPE This specification covers the Companys requirements for steel castings. 2.
5、0 INTRODUCTION Cast steels offer a wide range of properties, achievable by heat treatment, and are readily weldable at most strength levels. They offer good impact resistance but are less castable and more expensive than the gray cast irons. 2.1 Restricted Chemical Substances Effective January 1, 20
6、07, all product supplied to the requirements of this specification must comply with the requirements of the CEMS B-50 specification. 3.0 CONTENTS PAGE REFERENCE DOCUMENTS 1 GENERAL REQUIREMENTS 2 QUALITY 8 METHODS OF TEST 10 SOURCE APPROVAL AND QUALITY CONTROL 11 DESIGNATION ON DRAWINGS AND PURCHASE
7、 ORDERS 12 PACKING AND SHIPPING 12 APPENDIX - GENERAL INFORMATION (Green Sheets) 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
8、Standard ISO 9001 or TS-16949 NAVISTAR EPS-91 NAVISTAR Manufacturing Standard MS-D-13 ASTM E 446 ASTM A370 NAVISTAR Manufacturing Standard MS-E-1A2 ASTM E 10 ASTM E 94 CFR Title 29, Part 1910 ASTM E 71 ASTM E 208 NAVISTAR CEMS AT-2 ASTM E 125 ASTM E 112 NAVISTAR EPS-143 ASTM E 709 SAE J435 NUMBER: C
9、EMS E-2 TITLE: Steel Castings CURRENT ISSUE DATE: 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. AUGUST 2008 Page 2 o
10、f 13 5.0 CLASSIFICATION OR DESIGNATION Steel castings are classified on the basis of strength and heat treatment process. 6.0 GENERAL REQUIREMENTS 6.1 Mechanical Properties The primary intent of this specification is to obtain castings with controlled mechanical properties. (Refer to Section 6.2 for
11、 chemical requirements.) All castings purchased to this specification will be supplied heat treated and have mechanical properties conforming to Tables I, IA and II. Other required heat treatments and/or properties will be specified on the drawing. All heat treat agreements and specifications will r
12、emain in effect until mutually changed or terminated. 6.1.1 Castings - Normalized Or Normalized And Tempered Grades SC-0, 1, 2, and SC-3 will be either normalized or normalized and tempered, unless otherwise specified. Normalizing and tempering is required for Grades SC-2R, 4, 5, 6 and 6R but these
13、grades may be supplied quenched and tempered with approval of the controlling design engineering department, after consultation with the materials engineer. After quenching and tempering, they will meet the mechanical properties required for normalized and tempered castings, unless otherwise specifi
14、ed on the drawing. Grades SC-2 and SC-6 will be assigned an R suffix designation when impact requirements are specified. Example SC-2R, SC-6R. 6.1.2 Castings - Quenched And Tempered Where quenching and tempering is required for Grades SC-3 through SC-6 the appropriate suffix letter shown in Tables I
15、 and IA (suffix letters A, B, C, or D) indicating the required mechanical properties will be added: Example: SC-6B. Note: A suffix letter need not be added to those castings which are quenched and tempered to meet normalized and tempered mechanical properties. See ”Castings - Normalized or Normalize
16、d and Tempered” above. 6.1.2.1 Quenched castings will be tempered at 425C (800F) minimum, except those used in abrasion resistant applications. Castings must be in a homogeneous state, achieved by either a normalizing operation or a longer austenitizing time, prior to quenching and tempering, unless
17、 otherwise specified. However, when castings are specified quenched and tempered, they are not required to meet the mechanical properties specified for normalized or normalized and tempered castings, prior to quenching and tempering. The purchaser and supplier will agree upon the necessary process a
18、nd material to assure mechanical properties, machinability and weldability requirements are acheived. 6.1.3 Tensile Requirements The tensile requirements specified for test bars pertain to standard tensile test specimens machined from keel blocks or test coupons having a thickness of 25 mm (1 inch).
19、 Casting tensile requirements will be determined on tensile test specimens taken from the center of sections up to 25 mm (1 inch) thick, inclusive and from the mid-radius of sections over 25 mm (1 inch) thick. See “Methods of Test”, Section 8.0. 6.1.3.1 If the foundry anticipates or finds that it ca
20、nnot meet the strength requirements throughout the casting as determined above, the foundry will request the controlling engineering department to identify significant sections on the drawing. When sections of a casting are deemed significant for reasons of stress, function or reliability, the contr
21、olling design engineering department must designate the location NUMBER: CEMS E-2 TITLE: Steel Castings CURRENT ISSUE DATE: 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 t
22、o assume all patent liability. 2008 by Navistar, Inc. AUGUST 2008 Page 3 of 13 of the significant section or sections on the drawing. The purpose of this procedure is to clearly establish that strength (or corresponding hardness) determinations be made in those required areas. 6.1.4 Hardness Hardnes
23、s requirements for casting will be met on finished machined surfaces. Therefore, it may be necessary to control hardness at or near the casting surfaces to a range different than specified herein, to compensate for stock removal. The plant metallurgist and supplier will agree upon the different hard
24、ness ranges. The conversion of hardness to tensile strength will be according to the Hardness Conversion Chart per NAVISTAR Manufacturing Standard MS-E-1A2, available from Corporate Technical Standards, TDTC, 2911 Meyer Road, P.O. Box 1109, Fort Wayne, IN 46801-1109. TABLE I - MECHANICAL PROPERTIES*
25、 Designation Tensile Strength, min ksiYield Strength, 0.2% offset, min ksi Elongation in 2 inches, % min Reduction of Area, % min Brinell Hardness Number HBW Navistar Grade Suffix Letter Obsolete Navistar Grade Required Heat Treatment test bars castingstest bars castingstest bars castingstest bars c
26、astingstest bars and castingsSC-0 187 max SC-1 65 52 35 28 24 19 35 28 131-187 SC-2 75 60 45 36 20 16 20 24 156-207 SC-3 normalized or normalized and tempered 85 68 45 36 16 13 24 19 170-229 SC-4 SC-5 SC-6 SC-7 90 72 60 48 16 13 35 28 187-241 SC-2R 75 60 45 36 20 16 30 24 156-207 SC-6R none SC-R nor
27、malized and tempered * 90 72 60 48 16 13 35 28 187-241 SC-3 A 100 80 70 56 10 8 15 12 207-255 SC-4 SC-5 SC-6 B SC-7 105 84 85 68 17 14 35 28 217-269 SC-4 SC-5 SC-6 C SC-7 120 96 95 76 14 11 30 24 255-302 SC-4 SC-5 D quenched and tempered * 150 120 125 100 9 7 22 18 302-363 * See ”Appendix - General
28、Information” for mechanical properties design criteria. * These grades may be quenched and tempered with approval of the controlling design engineering department. In such cases, the materials engineer should be consulted. * When castings and test bars are quenched and tempered, they do not have to
29、meet the mechanical properties specified for normalized or normalized and tempered castings and test bars prior to quenching and tempering. NUMBER: CEMS E-2 TITLE: Steel Castings CURRENT ISSUE DATE: August 2008 This document is restricted and may not be sent outside Navistar, Inc. or reproduced with
30、out permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2008 by Navistar, Inc. AUGUST 2008 Page 4 of 13 TABLE I A - METRIC EQUIVALENT OF TABLE I* Designation Tensile Strength MPa, minYield Strength, 0.2% offset MPa, min Elongation in 50 mm % min Redu
31、ction of Area, % min Brinell Hardness Number HBW Navistar Grade Suffix Letter Obsolete Navistar Grade Required Heat Treatment test bars castingstest bars castingstest bars castingstest bars castingstest bars and castingsSC-0 187 max SC-1 448 359 241 193 24 19 35 28 131-187 SC-2 517 414 310 248 20 16
32、 20 24 156-207 SC-3 normalized or normalized and tempered 586 469 310 248 16 13 24 19 170-229 SC-4 SC-5 SC-6 SC-7 620 496 414 331 16 13 35 28 187-241 SC-2R 517 414 310 248 20 16 30 24 156-207 SC-6R none SC-R normalized and tempered * 620 496 414 331 16 13 35 28 187-241 SC-3 A 689 552 483 386 10 8 15
33、 12 207-255 SC-4 SC-5 SC-6 B SC-7 724 579 586 469 17 14 35 28 217-269 SC-4 SC-5 SC-6 C SC-7 827 662 655 524 14 11 30 24 255-302 SC-4 SC-5 D quenched and tempered * 1034 827 862 689 9 7 22 18 302-363 *, *, * See footnotes for Table I 6.1.5 Impact Test Requirements (Grade SC-2R and SC-6R) These grades
34、 of steel castings purchased to this specification will meet the following impact test requirements unless otherwise specified. See ”Methods of Test”, Section 8. 6.1.5.1 The requirements for standard and subsize Charpy V-Notch specimens are shown in Table II. The standard size specimen will be used
35、except where the section thickness does not permit machining a 10 mm by 10 mm specimen. In such cases, subsize specimens as listed will be used. The subsize specimen selected will be as large as the particular section thickness permits. 6.1.5.2 Nil Ductility Transition Temperature - Optional Method
36、SC-2R and SC-6R Grades steel castings will have a maximum nil ductility transition temperature (NDTT) of -34C (-30F). This requirement may be used in lieu of the Charpy V-Notch impact requirement for material with section thickness 15.9 mm (0.625 inch) and greater. NUMBER: CEMS E-2 TITLE: Steel Cast
37、ings CURRENT ISSUE DATE: 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. AUGUST 2008 Page 5 of 13 TABLE II - GRADES SC
38、-2R however, grinding, machining, chipping and oxy-fuel gouging may be used. 6.6.1.2.1 Careful visual inspection of the prepared area to assure complete removal of defects is normally adequate. However, the use of magnetic particle or dye penetrant inspection of the cavity may be desirable or be spe
39、cified for specific castings or areas of castings. 6.6.1.2.2 Before welding, the prepared cavity and the immediate area will be clean of all residue from the oxy-fuel or arc-air gouging, and free of oil, water, heavy scale, etc. which could adversely affect the quality of the weld repair. 6.6.1.2.3
40、All side walls of prepared cavities will be a minimum of 20 degrees from a line normal to the casting surface so that side wall fusion can be obtained during welding. 6.6.1.3 Arc welding will be used for all repair welds in steel castings. Shielded metal-arc, gas metal-arc and flux-cored arc welding
41、 processes are satisfactory; prior approval must be obtained for other arc welding processes. 6.6.1.4 Electrode selection will be such that the properties of the resulting weld will be at least equal to the specified minimum properties of the casting. 6.6.1.5 Areas of castings that have been repair
42、welded will be inspected to the same quality level, using the same method of inspection as specified or used for nonrepair welded castings. 6.6.1.6 Only personnel who have proven their ability through tests or other effective means will be used for preparing and repair welding of steel castings. 6.6
43、.2 Other Machining errors or casting defects encountered during machining may be weld repaired only after a procedure has been developed, suitable for the casting grade involved and approved by the controlling design engineering department. 7.0 QUALITY 7.1 General Castings will be clean and free of
44、severe rust, corrosion and all scale. Unless otherwise specified, superficial rust and corrosion is permissible but surface finish texture must be satisfactory for the intended use. Castings will not be covered with any substance which hides defects nor will they be painted unless authorized by the
45、purchaser. Casting suppliers will not subcontract castings without approval of the Purchasing Department and the Plant Metallurgist and/or Quality Control Manager of the using plant. 7.2 Soundness Castings will be free from injurious defects. They will meet the following requirements for soundness,
46、unless otherwise specified. See “Sampling Procedure” (Section 7.3) and “Methods of Test” (Section 8.0). 7.2.1 Castings will exhibit a surface quality of machined surfaces which is suitable for intended use. 7.2.2 In general, soundness of the casting except item (1) above will meet ASTM E 446, severi
47、ty level 3, using Vol. II reference radiographs (1 MV X-rays and Iridium 192 radiation). Soundness may NUMBER: CEMS E-2 TITLE: Steel Castings CURRENT ISSUE DATE: August 2008 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technic
48、al Standards. Suppliers are required to assume all patent liability. 2008 by Navistar, Inc. AUGUST 2008 Page 9 of 13 alternately be checked according to former ASTM E 71 where Class 3 is the acceptable level. This definition does not imply that radiographic certification is required unless so stated, but rather that a particular quality level is expected. For critical castings, soundness should be verified b
