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. AUGUST 2014 Page 1 of 14 NAVISTAR, INC. Material, Parts, and Process Specification
2、s (MPAPS) NUMBER: MPAPS A-0 PART II Former Designation: CEMS A-0 Part II TITLE: System of Steel Classification for Standard Steels CURRENT Rev. No.: 1408 DATE: August 2014 WRITTEN/REVIEWED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: CEMS A-0 Part II Feb. 2012 PRINTED COP
3、IES OF THIS 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
4、practices and to determine the applicability of regulatory limits prior to use. Change Notice: Changed to new MPAPS format; incorporated CEMS A-0 Part II Appendix into this spec; revised content of tables; revised Section 5.1; editorial changes. 1.0 SCOPE MPAPS A-0 consists of three major sections:
5、Part I Chemical Composition of Standard Steels Part II System of Steel Classification for Standard Steels Part III Classification System for Heat Treated Steels This part of the specification defines a system of steel classification. Wherever practicable, this classification system is to be used on
6、engineering drawings throughout the Company. In general, this specification is intended for non-heat-treated applications. Refer to Part I for more specific chemical composition requirements and steel cleanliness requirements for those steels covered in Part II. See Part III for specifying heat-trea
7、ted parts. Refer to Section A.0 - General Information at the end of this document for mechanical property tables listing expected minimum tensile properties for carbon steel grades and nominal tensile properties for alloy steel grades. 1.1 Restricted Chemical Substances Effective January 1, 2007, al
8、l product supplied to the requirements of this specification must comply with the requirements of the MPAPS B-50 specification. 2.0 INTRODUCTION This specification describes a system of steel classification which allows for specifying steels on engineering drawings by codes which have or can produce
9、 the desired mechanical properties. This system will be advantageous in a great majority of instances. The classification system is intended to apply in cases where options can by permitted at the manufacturing level. For sheet, structural products, and tubing, it is recommended that MPAPS A-6, A-10
10、, A-43, A-44, or other applicable specification be used. 2.1 Objectives - The major objectives of this specification are as follows: 2.1.1 To reduce the number of steels used within the Company by permitting standardization of steels. NUMBER: MPAPS A-0 PART II TITLE System of Steel Classification fo
11、r Standard Steels REVISION: 1408 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. AUGUST 2014 Page 2 of 14 2.1.2 To permit outside
12、suppliers of finished parts the maximum freedom in the selection of steels consistent with maintaining the desired mechanical properties. 2.1.3 To provide a system for the selection of equivalent steels, when necessary, without the necessity of obtaining the approval of the controlling design engine
13、ering department. 3.0 CONTENTS PAGE INTRODUCTION 1 CLASSIFICATION 2 GENERAL REQUIREMENTS STRAND CAST STEEL RESTRICTION 3 3 DESIGNATION ON DRAWINGS 4 ORDERING STEEL BY NAVISTAR CLASSIFICATION 5 STEEL ORDERED BY OUTSIDE SUPPLIERS 5 GENERAL INFORMATION 11 4.0 REFERENCE DOCUMENTS Unless otherwise specif
14、ied, 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 ASTM A 370 NAVISTAR Manufacturing Standard MS-D-13 CFR Title 29, Part 1910 5.0 CLASSIFICATION The
15、codes used for identification of classes will be composed of digits as described below. 5.1 Breakdown of Code Identification CODE BREAKDOWN: 1st Position Dash 2nd Position 3rd Position CODE CONTENT: 1 digit - 1 digit 2 digits PURPOSE OF CODE SEGMENTS: Refers to Steel Section of Navistar Material Spe
16、cifications. Example: 0 for A-0 2 for A-2 Dash always follows 1st position. Approximate carbon content. Example: 2 is in 0.20% carbon range: 4 is in 0.40% carbon range 00 thru 49 indicates carbon steel 15 indicates free machining steel EXAMPLE CODE: 0-201 0 - 2 01 MEANING: Steel Section MPAPS A-0 Ap
17、proximately 0.20% Carbon A Carbon Steel Class NUMBER: MPAPS A-0 PART II TITLE System of Steel Classification for Standard Steels REVISION: 1408 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are re
18、quired to assume all patent liability. 2014 by Navistar, Inc. AUGUST 2014 Page 3 of 14 Case Hardening. For applications which require case hardening, requirements will be specified on the engineering drawing per MPAPS A-40, along with the material requirement using the applicable steel code per this
19、 specification. Use of fully killed, fine grain steel is required, and sulfur is limited to 0.013% max. Welding Applications. For applications requiring welding, steels having 0.25% carbon or less are recommended. As the level of carbon in the steel increases, the weldability of the steel decreases,
20、 and special precautions may be necessary to insure sound welds. When welding of cold worked steels (Table 2) is required, it should be noted that the minimum mechanical properties specified are obtained by cold work and will not be maintained in the welded area. If the weld area is in a critically
21、stressed zone, refer to hot rolled minimum strength in Table 1 for property estimate. 5.2 The classification tables have 5 major headings as follows: 5.2.1 Column One: Code Each code used on an engineering drawing must have the same meaning throughout the Corporation. Therefore, the exact degree of
22、freedom permitted at the manufacturing level is defined precisely in the table. 5.2.2 Column Two: Description Of Class The explanation in this column covers the general engineering requirements of the code. 5.2.3 Column Three: Minimum Expected Yield Strength The minimum expected yield strength (for
23、the non-heat treated condition) is that of the lowest strength steel included in the code. This data is a guide for the engineer in the selection of a class to meet specific mechanical requirements. 5.2.4 Column Four: Recommended Steels The steels shown in this column cover the steels recommended by
24、 Materials Engineering and are grouped on the basis of yield strength. The code, not the actual steel, should be shown on the engineering drawing. 5.2.5 Column Five: Allowable Alternates Allowable alternate materials for the carbon steel grades may be used with permission of the Quality Control Mana
25、ger of the purchasing plant. These alternates must meet the minimum tensile properties and the restrictions of the code specified. When transverse properties or splitting strength are involved, sulfur and phosphorus will be restricted to the maximum of those of the recommended steels of the specifie
26、d code. 5.2.6 Choice of Table 5.2.6.1 Table 1 should be used in all cases where the condition of the steel (e.g., hot rolled, cold finished or semi-finished) is optional and the minimum mechanical properties therein indicated are adequate. 5.2.6.2 Table 2 should be used only where higher mechanical
27、properties, surface conditions, or other engineering considerations require the use of cold drawn steel only. Table 2 should not be used to obtain dimensional tolerances only. Where dimensional tolerance of cold drawn steel is desired and satisfactory mechanical properties can be met by a code in Ta
28、ble 1, this code should be used and dimensional tolerances placed on the drawing. This will allow the use of hot rolled, turned, or turned and polished steel, provided the dimensions are adhered to. NUMBER: MPAPS A-0 PART II TITLE System of Steel Classification for Standard Steels REVISION: 1408 Thi
29、s 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. AUGUST 2014 Page 4 of 14 5.2.6.3 Table 3 should be used only where special high tensi
30、le steels are required. 6.0 GENERAL REQUIREMENTS 6.1 Strand Cast Steel Restriction Strand Cast (SC) (i.e., continuous cast) steel shall not be applied for critical parts except when produced by an approved SC steel source. Critical parts are those that 1) require heat treatment, 2) are fabricated fr
31、om fine grained, fully killed micro-alloyed high-strength low-alloy (HSLA) steels, or 3) require refined manufacturing techniques indicative of high quality parts for critical applications. Approval of the strand cast steel source and a definition of the scope of the approval must be obtained prior
32、to the purchase of steel. Contact Materials Engineering for information on the strand cast approval process. 7.0 QUALITY All product supplied shall be clean and free from dirt, oils, sharp edges, or defects harmful to product performance. The supplier should be capable of providing statistical evide
33、nce that the material has been manufactured within process control limits established by the supplier for this product and that the process is capable of meeting the requirements of this specification. 8.0 METHODS OF TEST Not Applicable 9.0 SOURCE APPROVAL AND QUALITY CONTROL 9.1 Supplier Requiremen
34、ts 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 Approval Process) documentation and approval requirements. Suppliers must mainta
35、in their certification with an accredited registrar and must furnish copies of registration certificates to their Navistar Corporate Buyer upon request. 9.2 Approval Parts supplied against contracts or purchase orders citing this specification shall be equivalent in all respects to those samples whi
36、ch 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 product are required, the supplier shall notify Navistar Materials Eng
37、ineering and 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) (MSDS), in accordance with CFR Title 29, Part 1910 shall be submitted with
38、 the request for change. 9.3 Process Control The 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 having been produced in a state of statistical control and with a process ca
39、pable of providing all required properties. The part supplier and the quality control manager of the using NAVISTAR plant may determine testing and reporting requirements on specific products. NUMBER: MPAPS A-0 PART II TITLE System of Steel Classification for Standard Steels REVISION: 1408 This docu
40、ment 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. AUGUST 2014 Page 5 of 14 10.0 DESIGNATION ON DRAWINGS The steel classification code to appe
41、ar on engineering drawings will be selected from the authorized codes listed in Tables 1, 2 or 3. The code will appear in the material block on engineering drawings as follows: Examples: Steel, 0-201, MPAPS A-0, Part II Steel, 2-410, MPAPS A-0, Part II 10.1 Ordering Steel by Navistar Classification
42、The successful operation of this classification system depends upon, first, the selection of a code which will guarantee satisfactory engineering performances, and, second, the selection of a single steel from within this code which will best respond to all manufacturing operations, such as forging,
43、 machining, welding, and case hardening. In order to effect Company-wide standardization of materials, steel should be selected from the “Recommended Steels” column within the code whenever practicable. 10.1.1 The Quality Control manager of the plant ordering the steel will make the selection of ind
44、ividual steel, after consulting the various departments involved, from the standpoint of cost, inventory, processing, etc., to determine which steel within the code can be used to best advantage. The drawings and engineering specifications for individual parts should show only the code. 10.1.2 When
45、more than one plant is involved in the production of a part, it is the responsibility of the Quality Control manager of the originating plant to obtain the approval from other plants on the selection of material. In general, it should be the plant having the most critical operation (usually case har
46、dening or welding) who should decide upon the material which is most suitable for his operation. 10.1.3 The Quality Control manager is responsible for specifying the steel to be purchased. The purchase order must reference the specific steel grades defined in MPAPS A-0 Part 1. In no case should othe
47、r steels be substituted without the approval of the plant quality control manager, as different types of steel, even though satisfactory from the engineering performance standpoint, may respond differently to the manufacturing operations. 10.2 Steel Ordered By Outside Suppliers Outside suppliers of
48、semi-finished parts requiring welding, heat treating or machining in Navistar plants, must obtain approval of the specific steel from the Quality Control Manager of the purchasing plant. Outside suppliers furnishing finished parts may use any steel covered by the “Recommended Steels” column in Tables 1, 2 or 3 for the code shown on the drawing. The chemistry requirements of specific steel grades are defined in MPAPS A-0 Part 1. 11.0 TECHNICAL INFORMATION For further information related to the technical content of this specifica
