NAVISTAR MPAPS E06-501-2014 CARBON SCRAPER RING MATERIAL.pdf
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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 5 NAVISTAR, INC. Material, Parts, and Process Specifications
2、 (MPAPS) NUMBER: MPAPS E06-5019 Former Designation: TITLE: CARBON SCRAPER RING MATERIAL CURRENT REV No.: 1408 DATE: AUGUST 2014 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION This specifica
3、tion 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 t
4、o use. Change Notice: NEW 1.0 APPLICATION This specification covers material for a diesel engine cylindrical component known as a carbon scraper ring, protection ring, fire ring, or anti-polishing ring that is inserted in the upper part of an engine cylinder liner in the position of a top dead centr
5、e above the top land of the piston (Figure 1). Its functions and characteristics are: Scrapes off the hard carbon deposit which forms on the top land of the piston. Helps to prevent the inner cylinder wall from wearing and to keep lubricating oil consumption low level. Same heat expansion as a cylin
6、der liner by using same material. 2.0 SCOPE This specification covers material composition and properties requirements of the carbon scraper ring material for diesel engine cylinder liners 2.1 Restricted Chemical Substances Effective January 1, 2007, all product supplied to the requirements of this
7、specification must comply with the requirements of the MPAPS B-50 specification. 3.0 REFERENCE DOCUMENTS Unless otherwise specified, the latest issue of all referenced standards shall apply. The following Specifications, Standards, and Regulations are referenced in this specification. Quality System
8、 Standard ISO 9001 or TS-16949 CFR Title 29, Part 1910 NAVISTAR CEMS E-6 ISO 945 NAVISTAR Manufacturing Std. MS-D-13 NAVISTAR Engineering Design Std A-16 NAVISTAR MPAPS B-50 NUMBER: MPAPS E06-5019 TITLE: Carbon Scraper Ring Material REVISION: 1408 This document is restricted and may not be sent outs
9、ide 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 5 4.0 REQUIREMENTS 4.1 Chemical Composition (wt %) Figure 1 Alloyed cast gray iron: Carbon 2.9 - 3.7 Silicon 1.8
10、 - 2.8 Manganese 0.5 - 1.0 Phosphorous 0.05 - 0.4 Sulfur 0.12 MAX Chromium 0.4 MAX Boron 0.03 - 0.08 Copper 0.3 - 0.6 4.2 Microstructure The matrix structure shall consist of lamellar pearlite with free ferrite not exceeding 4% and with 3% to 8 % boron carbides preferably forming a continuous networ
11、k. Graphite: uniformly distributed graphite flakes type A and B, size 4 to 6 per ISO 945 4.3 Mechanical Properties Tensile Stress : min. 255MPa Fatigue strength: 182 MPa Coefficient of Thermal Expansion: 11.3x10-6 Hardness : HRB 94 - 104 Poissons ratio: 0.3 NUMBER: MPAPS E06-5019 TITLE: Carbon Scrap
12、er Ring Material 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 3 of 5 Figure 2 Microstructure 10
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