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. 2018 by Navistar, Inc. FEBRUARY 2018 Page 1 of 11 NAVISTAR, INC. Material, Parts, and Process Specificati
2、ons (MPAPS) NUMBER: MPAPS E-7 Former Designation: CEMS E-7 TITLE: Malleable Iron Castings CURRENT REV No.: 1802 DATE: Feb. 2018 WRITTEN/EDITED BY: W. Cook APPROVED BY: R. Goluch SUPERSEDES: Rev. February 2002 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION This specification ma
3、y 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.
4、1.0 APPLICATION Malleable iron castings provide good ductility and machinability. They are similar to nodular iron castings except that the graphite in malleable castings is present as temper carbon nodules. 2.0 SCOPE This specification covers the Corporations requirements for malleable iron casting
5、s. 2.1 Restricted Chemical Substances Effective January 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the MPAPS B-50 specification. 3.0 CONTENTS PAGE REFERENCE DOCUMENTS 1 GRADES AND REQUIRMENTS 1 QUALITY 3 METHODS OF TEST 3 SOURCE APPRO
6、VAL AND QUALITY CONTROL 4 DESIGNATION ON DRAWINGS AND PURCHASE ORDERS 4 PACKING AND SHIPPING 4 APPENDIX - GENERAL INFORMATION 5 4.0 REFERENCE DOCUMENTS Unless otherwise specified, the latest issue of all referenced standards shall apply. The following standards, specifications and regulations are re
7、ferenced in this specification. ISO 9001/TS 16949 Quality Management Systems- Requirements CFR Title 29, Part 1910 Occupational Safety and Health Standard NAVISTAR D-13 Supplier Packing and Shipping Standard NUMBER: MPAPS E-7 TITLE: Malleable Iron Castings CURRENT ISSUE REV: 1802 This document is re
8、stricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2018 by Navistar, Inc. FEBRUARY 2018 Page 2 of 11 NAVISTAR EDS-A16 Key Control Characteristics (KCC) NAVISTAR EPS-143 Brand
9、Identity Standards NAVISTAR EPS-91 Date Code NAVISTAR MPAPS B-50 Restricted Chemical Substances SAE J158 Automotive Malleable Iron Castings ASTM A247 Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings ASTM A602 Standard Specification for Automotive Malleable Iron Cas
10、tings ASTM E10 Standard Test Method for Brinell Hardness of Metallic Materials 5.0 CLASSIFICATION Malleable iron grades are classified on the basis of strength and hardness. 6.0 GRADES AND REQUIREMENTS Requirements for the grades defined in this specification cover castings of ferritic, pearlitic an
11、d tempered martensitic malleable iron. These requirements as shown in Table I are in close agreement with such National standards as SAE J158 and ASTM A602. Additional casting requirements or limitations such as chemical composition and tensile properties may be agreed upon by the purchaser and supp
12、lier. Typical properties are shown in the ”Appendix - General Information” section. Any additional product requirements must appear on the casting drawing. TABLE I - CASTING REQUIREMENTS Designation Condition Casting Hardness, BHN International grade Obsolete grade SAE J158 or ASTM A602 M3210 32510
13、per E-7 M3210 ferritic 163 max M4504 Type B per E-8 M4504 pearlitic-ferritic or tempered martensite 163-217 M5003 - M5003 187-241 M6003 - M5503 tempered martensite 187-241 Q Engineering Data on Malleable Cast Irons, BCIRA (British Cast Iron Research Association), 1976 A.5 Design Information (Continu
14、ed) STRENGTH1000 psiELONGATION %MPa Brinell Hardness Number Figure A1 Typical Tensile Properties Pearlitic/Martensitic Malleable Iron NUMBER: MPAPS E-7 TITLE: Malleable Iron Castings CURRENT ISSUE REV: 1802 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without
15、permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2018 by Navistar, Inc. FEBRUARY 2018 Page 9 of 11 A.5.1.2 Compressive Properties Ferritic Malleable Yield Strength = Y.S. (Tension) + 1100 psi (8 MPa) Pearlitic and Martensitic Yield Strength = T.S.
16、 (Tension) + 1300 to 2200 psi (9 to 16 MPa) A.5.1.3 Modulus of Elasticity: Ferritic Malleable E = 24 to 25 x 106 psi (165 to 172 GPa) Pearlitic and Martensitic E = 25 to 28 x 106 psi (172 to 193 GPa) Compression E c = 22 to 25 x 106 psi (152 to 172 GPa) Shear G = 9.5 to 11 x 106 psi (66 to 76 GPa) A
17、.5.1.4 Shear Properties: Ration of shear strength to tensile strength = 0.90 A.5.1.5 Torsional Properties: Ratio of torsional strength to tensile strength = 0.90 Ratio of torsional yield strength to tensile yield strength = 0.70 to 0.77 A.5.1.6 Fatigue Characteristics (based on Wohler rotating bendi
18、ng fatigue data): Smooth (unnotched) Ferritic Malleable FLun = 0.45 x Tensile Strength Pearlitic and Martensitic FLun = 0.40 to 0.45 x Tensile Strength Notched: (all grades) FLn = 0.60 x FLun A.5.1.7 Impact Properties: (Ferritic malleable) Transition Temperature (notched) TTn = -10C to +30C Transiti
19、on Temperature (unnotched) TTun = 50C lower than TTn NDT = 50C Notched impact value = 10 to 13 ft lbsf (13.6 to 17.6J) Unnotched impact value = 80 to 100 ft lbsf (108 to 136J) (Pearlitic malleable) Notched impact value = 3 to 9 ft lbsf (4.1 to 12.2J) A.5.1.8 Damping Capacity (energy lost in one vibr
20、ation cycle): Ferritic = 6.30% at 30 000 psi (207 MPa); 4.20% at 15 000 psi (103 MPa) Pearlitic = 4.55% at 30 000 psi (207 MPa); 3.30% at 15 000 psi (103 MPa) NUMBER: MPAPS E-7 TITLE: Malleable Iron Castings CURRENT ISSUE REV: 1802 This document is restricted and may not be sent outside Navistar, In
21、c. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2018 by Navistar, Inc. FEBRUARY 2018 Page 10 of 11 A.5.1.9 Poissons Ratio: = 0.26 A.5.1.10 Wear Properties A.5.1.10.1 Ferritic malleable iron (Grade M3210) is satisfactory i
22、n very moderate wear applications. Use should be limited to low bearing pressures and low speeds to avoid galling. A.5.1.10.2 For improved wear resistance, the pearlitic and martensitic grades are recommended. These grades provide satisfactory performance in lubricated bearing and dry bearing applic
23、ations such as gears, camshafts, etc. They have nongalling properties in metal-to-metal contact similar to gray iron. Wear resistance may be further improved by flame or induction surface hardening techniques. This improvement in wear resistance is generally in proportion to the hardness developed.
24、General surface hardnesses in the range Rockwell C55 to 60 are obtainable. (Note: Conventional measurements reflect the influence of both the graphite and matrix structure. The matrix microhardness may be some 5 to 7 points higher.) Response to induction or flame hardening is dependent upon a prior microstructure having a high percentage of combined carbon. The recommended grades for this processing are: M5003, M6003 and Q Editorial Changes; Added Contents of Appendix R. Goluch 2/13/2018
