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 7 NAVISTAR, INC. Material, Parts, and Process Specifications
2、 (MPAPS) NUMBER: MPAPS A-6 Part II Former Designation CEMS A-6 Part II TITLE: Low Carbon Steel, Flat Rolled and Structural Shapes - Part II. METALLIC COATED SHEET AND STRIP CURRENT REV No.: 1408 DATE: AUGUST 2014 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES:
3、 Rev. 1402 Feb. 2014 PRINTED COPIES 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 consul
4、t appropriate safety and health practices and to determine the applicability of regulatory limits prior to use. Change Notice: Added Type M to Section 4.3.2.1; editorial changes. MPAPS A-6 is divided into three parts, as follows: Part I - Covers uncoated base metal requirements for low carbon steel
5、products Part II - Metallic Coated Low Carbon Steel Sheet/Strip (including galvanized and aluminized) Part III - Organic Coated Low Carbon Steel Sheet/Strip Part II. METALLIC COATED SHEET AND STRIP 1.0 SCOPE Part II of this specification covers the Companys requirements for metallic coated steel she
6、et and strip. 2.0 APPLICATION This specification covers the requirements for metallic coated steel sheet and strip products, and describes a system for specifying such products on engineering drawings. Metallic coatings are designated by grade (Grade 1A for aluminum, or Grade 1GALV or Grade 6GALV fo
7、r zinc) and by coating weight for each class of coating within each grade. The coating weight/class applies equally to both sides of the sheet for Grade 1A, but to only one side of the sheet for Grade 1GALV or Grade 6GALV. (Note: The use of terne coating per this specification is no longer permitted
8、 in Navistar products; contact Materials Engineering for guidance.) 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 REFERENCE DOCUMENTS Unless otherwise
9、 specified, the latest issue of all referenced standards shall apply. The following Specifications, Standards, and Regulations are referenced in this specification. Quality System Standard ISO 9001 or TS-16949 CFR Title 29, Part 1910 NAVISTAR Manufacturing Std. MS-D-13 NAVISTAR Engineering Design St
10、d A-16 NAVISTAR MPAPS B-50 NAVISTAR MPAPS A-6 Part I NUMBER: MPAPS A-6 Pt. II TITLE: Part II. METALLIC COATED SHEET AND STRIP Part II. METALLIC COATED SHEET AND STRIP REVISION: 1408 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate
11、 Technical Standards. Suppliers are required to assume all patent liability. 2014 by Navistar, Inc. AUGUST 2014 Page 2 of 7 ASTM A 90 ASTM A 428 ASTM A 463 SAE J911 SAE J810 ASTM A 792 ASTM A 879 ASTM A 917 ASTM A 924 SAE J1562 4.0 REQUIREMENTS 4.1 Classification Metallic coatings are classified by
12、the type of coating and the weight or thickness of the coated layer. Metallic coating types will be identified according to Grades shown in Table I for Navistar parts. TABLE I. Metallic Coating Types Grade Type of Coating 1A aluminum and aluminum alloy 1GALV 6GALV zinc and zinc alloy 4.2 Base Metal
13、Unless otherwise specified, material furnished to the requirements of this specification will meet applicable requirements of ASTM A 924 for sheet and strip products metallic coated by the Hot Dip Process, or ASTM A 917 for sheet and strip products metallic coated by the Electrolytic Process. Proper
14、ties of the material furnished shall conform to limits established for the Grade, Type, and quality of the sheet or strip specified on the Engineering drawing and/or purchase order, as described in MPAPS A-6, Part I. Other qualities and Types may be specified on the engineering drawing or purchase o
15、rder. When not otherwise specified on drawings or purchase orders, Commercial Steel (CS) will be supplied. A minimum yield strength of 22 ksi (150 MPa) is required for all material supplied as Grade 1 GALV, and materials supplied as Grade 6 GALV must meet minimum yield strength for the specified mat
16、erial type (e.g., Type 340X) as defined in MPAPS A-6, Part I, unless otherwise specified on the drawing and/or purchase order or unless approved by the controlling Engineering Department. 4.3 Coating Class And Requirements 4.3.1 Grade 1A - Aluminum and Aluminum Alloy Coatings Unless otherwise specif
17、ied, material supplied to this grade shall have coatings applied by the Hot Dip Process and shall meet applicable requirements of ASTM A 463 (Types T1 and T2) or ASTM A 792 (Type AZ). The Type 1 (T1) aluminum-silicon (5-11%) alloy coating is used in heat resisting applications where both heat and co
18、rrosion resistance are involved. The Type 2 (T2) pure aluminum coating is used in applications where better corrosion resistance is needed without the heat resistance. The AZ coatings are an aluminum-zinc alloy used in special applications where high temperature galvanic corrosion protection is need
19、ed. Coating class and weight requirements are shown in Table II. NUMBER: MPAPS A-6 Pt. II TITLE: Part II. METALLIC COATED SHEET AND STRIP Part II. METALLIC COATED SHEET AND STRIP REVISION: 1408 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission fr
20、om Corporate Technical Standards. Suppliers are required to assume all patent liability. 2014 by Navistar, Inc. AUGUST 2014 Page 3 of 7 TABLE II. ALUMINUM AND ALUMINUM ALLOY COATINGS * COATING CLASS OBSOLETE NAVISTAR DESIGNATION oz/ft2 COATING WEIGHT BOTH SIDES * NOMINAL TRIPLE SPOT TEST g/m2 MINIMU
21、M SINGLE SPOT TEST g/m2 T1 75 * T1 25 75 60 T1 120 T1 40 120 90 T2 200 - 200 180 T2 300 - 300 270 AZ-150 - 150 130 AZ-165 - 165 150 AZ-180 - 180 155 * On existing drawings where Grade 1A is specified and where type of coating T1/T2 is not shown, Type 1 will be supplied. * Due to the variability invo
22、lved in the Hot Dip Process, the coating weight is not always distributed uniformly from edge to edge or on both sides of the sheet, however it may be expected that not less than 40% of the single spot test limit will be found on either side. * On existing drawings where Grade 1A Class T1 is specifi
23、ed and the Class of coating is not designated, Class T1-75 will be supplied. 4.3.2 Grade 1GALV or Grade 6GALV -Zinc and Zinc Alloy Coatings This specification includes a system for specifying zinc and zinc alloy coatings on sheet and strip products, and applies to both the Electrolytic and Hot Dip P
24、rocesses. The coating classification (similar to ASTM A 879 and/or SAE J1562) is based upon the minimum and maximum single-spot coating weight on each side of the sheet. A 7-character alpha-numeric code is used to describe the zinc or zinc alloy coating and the coating weight on each side of the she
25、et. The classification and coating weight requirements are shown in Table III for Hot Dip coated steels and in Table IV for Electrogalvanize coated steels. The system includes a surface appearance quality requirement by identifying parts where the exposed surface must be capable of providing a Class
26、 A painted appearance* (refer to Appendix Section A.5 for definition of surface classifications). The 7-character code is described below. * Steel ordered for exposed applications will exhibit an Ra surface roughness of 0.5-1.6 m and a peak count greater than 40 peaks/cm, as measured in accordance w
27、ith SAE J911, using a 1.25 m bandwidth for determining peaks per cm and an appropriate traverse as per SAE J911. (See MPAPS A-6, Part I) NUMBER: MPAPS A-6 Pt. II TITLE: Part II. METALLIC COATED SHEET AND STRIP Part II. METALLIC COATED SHEET AND STRIP REVISION: 1408 This document is restricted and ma
28、y 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 7 Note: The prefix EG added to the 7-character code means that electrolytic coating is require
29、d. Characters: 1st and 2nd Designates the coating weight on the nonvisible side of the sheet or panel 3rd Designates the type of zinc/alloy coating on the nonvisible side of the sheet or panel 4th and 5th Designates the coating weight on the visible/exposed side of the sheet or panel 6th Designates
30、the type of zinc/alloy coating on the visible/exposed side of the sheet/panel 7th Designates the intended use of the part as: E = exposed part* or U = unexposed part * Steel ordered for exposed applications will exhibit an Ra surface roughness of 0.5-1.6 m and a peak count greater than 40 peaks/cm,
31、as measured in accordance with SAE J911, using a 1.25 m bandwidth for determining peaks per cm and an appropriate traverse as per SAE J911. (See MPAPS A-6, Part I) 4.3.2.1 Zinc/Zinc Alloy Coating Types The following types of zinc and zinc alloy coatings are covered by this specification: M = Zinc-Al
32、uminum-Magnesium Alloy (zinc with 6% aluminum and 3% magnesium) G = Zinc (essentially 99% pure zinc) A = Zinc-Iron Alloy (zinc with 8-12% bulk iron) N = Zinc-Nickel Alloy (zinc with 9-16% nickel) X = preceded by 00; indicates no coating/bare surface Examples: 60G60GU = 60 G 60 G U minimum 60 g/m 2 c
33、oating weight on unexposed side zinc minimum 60 g/m2 weight exposed side zinc on exposed side application is an unexposed part 60A01AE = 60 A 01 A E minimum 60 g/m2 coating weight on unexposed side zinc-iron no minimum on exposed side zinc-Iron on exposed side application is an exposed part EG 70G00
34、XE : EG = Electrogalvanized coating is required (70G00XE) 70 G 00 X E minimum 70 g/m2 coating weight on unexposed side zinc no coating on exposed side bare metal surface on exposed side application is an exposed part 4.3.2.2 Surface Condition The hot dip zinc coating surface is normally spangled and
35、 unsuitable for painting (i.e., not a Class A surface relative to appearance). Treating the surface during solidification provides a minimized spangle surface which can be further refined by a cold rolling skin pass to provide an extra smooth surface. Zinc-iron and all electrolytic coatings are not
36、spangled and provide a smooth surface suitable for painting. 4.3.2.2.1 Suffix U: All Hot Dip Coating classes identified with the suffix U (unexposed) will be supplied with minimized spangle surface. NUMBER: MPAPS A-6 Pt. II TITLE: Part II. METALLIC COATED SHEET AND STRIP Part II. METALLIC COATED SHE
37、ET AND STRIP 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 5 of 7 4.3.2.2.2 Suffix E: All Hot Di
38、p Coating classes identified with the suffix E (exposed) will be supplied with minimized spangle, extra smooth surface. 4.3.2.2.3 Option: Supplier may provide a better surface than specified. 4.3.2.2.4 Grade 1GALV and Grade 6GALV- Electrolytic Deposition: Zinc and zinc alloy coatings deposited by th
39、e electrolytic process have smoother surfaces with closer control of coating weight/thickness. In cases where Engineering requires the better appearance or closer control of the electrogalvanize process, it may be specified by adding the prefix EG to the 7-character code designation. Example: EG60G6
40、0GE. TABLE III. ZINC/ZINC ALLOY COATINGS * - HOT DIP PROCESS COATING CLASS OBSOLETE NAVISTAR DESIGNATION oz/ft2 * COATING WEIGHT ONE SIDE ONLY MINIMUM SINGLE SPOT TEST g/m2 MAXIMUM SINGLE SPOT TEST g/m2 00 - 0 0 01 G01 or A01 No Min. No Max. 20 - 20 60 40 A40 40 80 45 - 45 85 50 - 50 100 60 G60 or A
41、60 60 110 70 - 70 120 90 - 90 140 98 G90 98 160 * G115 120 No Max. * G140 145 No. Max. * G165 170 No. Max. * G185 195 No. Max. * G210 220 No. Max. TABLE IV. ZINC/ZINC ALLOY COATINGS * - ELECTROLYTIC PROCESS COATING CLASS OBSOLETE NAVISTAR DESIGNATION oz/ft2 * COATING WEIGHT ONE SIDE ONLY MINIMUM SIN
42、GLE SPOT TEST g/m2 MAXIMUM SINGLE SPOT TEST g/m2 00 - 0 0 20 - 20 40 30 - 30 50 40 A40 40 70 50 - 50 80 60 G60 or A60 60 90 70 - 60 110 90 - 90 130 98 G90 98 140 * The type of zinc/alloy coating is indicated by a suffix letter following the Class designation. * Obsolete classes are shown for referen
43、ce only and should not be used in new design. NUMBER: MPAPS A-6 Pt. II TITLE: Part II. METALLIC COATED SHEET AND STRIP Part II. METALLIC COATED SHEET AND STRIP REVISION: 1408 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Techni
44、cal Standards. Suppliers are required to assume all patent liability. 2014 by Navistar, Inc. AUGUST 2014 Page 6 of 7 4.3.2.3 Coating Option: The supplier may substitute electrogalvanized coatings of the same type and weight for hot dip galvanized coatings at his option. 4.4 Methods of Test Determina
45、tion of coating weight will be in accordance with the appropriate test method as shown below. Grade Coating ASTM Designation 1A Aluminum A 428 1GALV 6GALV Zinc A 90 5.0 QUALITY The supplier should be capable of providing statistical evidence that the material supplied has been manufactured within pr
46、ocess control limits established by the supplier for this product and that the process is capable of meeting all requirements of this specification. 5.1 Coated sheet and strip products will exhibit a uniform surface appearance, and be free from injurious defects such as blisters and bare spots detri
47、mental to fabrication and/or function of the part. The material identified by an E suffix (exposed parts) shall be free from such surface defects as might adversely affect the ability to obtain a uniform painted appearance satisfactory for the intended purpose. Unacceptable surface defects include,
48、but are not limited to, runs, sags scratches, zinc/aluminum stringers, coarse coating or zinc/aluminum ridges, zinc/aluminum flakes. Unacceptable base metal surface defects include rolled in scale, skin laminations, coil breaks, edge breaks, chatter marks, fluting, friction digs, holes, slivers, coa
49、rse grain (orange peel), pinchers, ragged edges, rolled in dirt, or stretcher strain and other defects defined within SAE J810. 6.0 SOURCE APPROVAL AND QUALITY CONTROL 6.1 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 P
