1、NAVISTAR, INC. CEMS (CORPORATE ENGINEERING MATERIAL SPECIFICATION) NUMBER: CEMS A-6, PART II TITLE: Low Carbon Steel, Flat Rolled and Structural Shapes - Part II. METALLIC COATED SHEET AND STRIP CURRENT ISSUE DATE: October 2008 WRITTEN/REVIEWED BY: Materials Engineering APPROVED BY: Materials Engine
2、ering SUPERSEDES ISSUE OF: April 2005 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 resp
3、onsible to consult appropriate safety and health practices and to determine the applicability of regulatory limits prior to use. Change Notice: Replaced “International Truck and Engine Corporation” with “Navistar, Inc.” per corporate directive; added CEMS B-50 requirement; deleted terne coating opti
4、on; editorial changes. CEMS A-6 is divided into three parts, as follows: Part I - covers uncoated base metal requirements for low carbon steel products Part II - Metallic Coated Low Carbon Steel Sheet/Strip (including galvanized and aluminized) Part III - Organic Coated Low Carbon Steel Sheet/Strip
5、Part II. METALLIC COATED SHEET AND STRIP 1.0 SCOPEPart II of this specification covers the Companys requirements for metallic coated steel sheet and strip. 2.0 INTRODUCTIONThis specification covers the requirements for metallic coated steel sheet and strip products, and describes a system for specif
6、ying such products on engineering drawings. Metallic coatings are designated by grade (Grade 1A for aluminum, or Grade 1GALV or Grade 6GALV for zinc) and by coating weight (in grams per square meter) for each class of coating within each grade. The coating weight/class applies equally to both sides
7、of the sheet for Grade 1A, but to only one side of the sheet for Grade 1GALV or Grade 6GALV. The use of terne coating per this specification is no longer permitted in Navistar products; contact Materials Engineering for guidance. 2.1 Restricted Chemical SubstancesEffective January 1, 2007, all produ
8、ct supplied to the requirements of this specification must comply with the requirements of the CEMS B-50 specification. 3.0 CONTENTS PAGE INTRODUCTION . 1 REFERENCE DOCUMENTS 2 CLASSIFICATION 2 GENERAL REQUIREMENTS 2 QUALITY. 6 METHODS OF TEST . 6 SOURCE APPROVAL AND QUALITY CONTROL 6 DESIGNATION ON
9、 DRAWINGS AND PURCHASE ORDERS . 7 PACKING AND SHIPPING . 7 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. OCTOBER 2008 Page 1 of
10、7 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: TITLE: Low Carbon Steel, Flat Rolled And CURRENT ISSUE DATE: CEMS A-6, PART II Structural Shapes Part II. Coated Sheet St
11、eel October 2008 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. CONTACT INFORMATION 7 APPENDIX - GENERAL INFORMATION Green Sheets 4.0 REFERENCE DOCUMENTSUnless otherwise specified the latest issue of all ref
12、erence standards shall apply. The following specifications, standards, and regulations are referenced in this specification: Quality System Standard ISO 9001 or TS-16949 CEMS B-50 ASTM A 792 NAVISTAR Manufacturing Std. MS-D-13 ASTM A 428 ASTM A 879 NAVISTAR CEMS A-6, Part I ASTM A 463 ASTM A 917 CFR
13、 Title 29, Part 1910 SAE J911 ASTM A 924 ASTM A 90 SAE J 1562 5.0 CLASSIFICATION Metallic coatings are classified by 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. Metall
14、ic Coating Types Grade Type of Coating 1A aluminum and aluminum alloy 1GALV 6GALV zinc and zinc alloy 6.0 GENERAL REQUIREMENTS 6.1 Base Metal Unless otherwise specified, material furnished to the requirements of this specification will meet applicable requirements of ASTM A 924 for sheet and strip p
15、roducts metallic coated by the Hot Dip Process, or ASTM A 917 for sheet and strip products metallic coated by the Electrolytic Process. Properties 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
16、 and/or purchase order, as described in CEMS A-6, Part I. Other qualities and Types may be specified on the engineering drawing or purchase order. 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 requ
17、ired for all material supplied as Grade 1GALV, and materials supplied as Grade 6GALV must meet minimum yield strength for the specified material type (e.g., Type 340X) as defined in CEMS A-6, Part I, unless otherwise specified on the drawing and/or purchase order or unless approved by the controllin
18、g Engineering Department. 6.2 Coating Class And Requirements 6.2.1 Grade 1A - Aluminum and Aluminum Alloy Coatings Unless otherwise specified, 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
19、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 corrosion resistance are involved. The Type 2 (T2) pure aluminum Suppliers are required to assume all patent liability. 2008 by Navistar, Inc. OCTOBER 2008 Page 2 o
20、f 7 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: TITLE: Low Carbon Steel, Flat Rolled And CURRENT ISSUE DATE: CEMS A-6, PART II Structural Shapes Part II. Coated Sheet
21、Steel October 2008 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. coating is used in applications where better corrosion resistance is needed without the heat resistance. The AZ coatings are an aluminum-zinc
22、 alloy used in special applications where high temperature galvanic corrosion protection is needed. Coating class and weight requirements are shown in Table II. TABLE II. ALUMINUM AND ALUMINUM ALLOY COATINGS * COATING WEIGHT BOTH SIDES * COATING CLASS OBSOLETE NAVISTAR DESIGNATION oz/ft2NOMINAL TRIP
23、LE SPOT TEST g/m2MINIMUM SINGLE SPOT TEST g/m2T1 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 150AZ-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
24、the variability involved 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
25、 Class T1 is specified and the Class of coating is not designated, Class T1-75 will be supplied. 6.2.2 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 Electr
26、olytic and Hot Dip Processes. The coating classification (similar to ASTM A 879 and/or SAE J 1562) 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
27、 each side of the sheet. 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
28、 of providing a Class A painted appearance*. The 7-character code is described below. Suppliers are required to assume all patent liability. 2008 by Navistar, Inc. OCTOBER 2008 Page 3 of 7 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduc
29、tion or networking permitted without license from IHS-,-,-NUMBER: TITLE: Low Carbon Steel, Flat Rolled And CURRENT ISSUE DATE: CEMS A-6, PART II Structural Shapes Part II. Coated Sheet Steel October 2008 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without per
30、mission from Corporate Technical Standards. Note: The prefix EG added to the 7-character code means that electrolytic coating is required. 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 nonvisibl
31、e 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 the type of zinc/alloy coating on the visible/exposed side of the sheet/panel 7thDesignates the intended use of the part as: E = exposed part* or U = unexposed part
32、 * Steel ordered for exposed applications will exhibit an Rasurface roughness of 0.5-1.6 m and a peak count greater than 40 peaks/cm, 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 CEMS A-6, Part I, Sec
33、tion 6.3.3) 6.2.2.1 Zinc/Zinc Alloy Coating TypesThe following types of zinc and zinc alloy coatings are covered by this specification 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
34、coating/bare surface X = preceded by two non-zero numeric characters; indicates a non-standard coating which will be described separately on the drawing or purchase order Examples: 60G60GU = 60 G 60 G Uminimum 60 g/m 2coating weight on unexposed side zinc minimum 60 g/m2weight exposed side zinc on e
35、xposed side application is an unexposed part 60A01AE = 60 A 01 A Eminimum 60 g/m2coating weight on unexposed side zinc-iron no minimum on exposed side zinc-Iron on exposed side application is an exposed part EG 70G00XE : EG = Electrogalvanized coating is required (70G00XE) 70 G 00 X Eminimum 70 g/m2
36、 coating weight on unexposed side zinc no coating on exposed side bare metal surface on exposed side application is an exposed part 6.2.2.2 Surface TextureThe hot dip zinc coating surface is normally spangled and unsuitable for painting (i.e., not a Class A surface relative to appearance). Treating
37、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 spangled and provide a smooth surface suitable for painting. Suppliers are required to a
38、ssume all patent liability. 2008 by Navistar, Inc. OCTOBER 2008 Page 4 of 7 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: TITLE: Low Carbon Steel, Flat Rolled And CURREN
39、T ISSUE DATE: CEMS A-6, PART II Structural Shapes Part II. Coated Sheet Steel October 2008 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. 6.2.2.2.1 Suffix U: All Hot Dip Coating classes identified with the s
40、uffix U (unexposed) will be supplied with minimized spangle surface. 6.2.2.2.2 Suffix E: All Hot Dip Coating classes identified with the suffix E (exposed) will be supplied with minimized spangle, extra smooth surface. 6.2.2.2.3 Option: Supplier may provide a better surface than specified. 6.2.2.2.4
41、 Grade 1GALV and Grade 6GALV- Electrolytic Deposition: Zinc and zinc alloy coatings deposited by the 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 proces
42、s, it may be specified by adding the prefix EG to the 7-character code designation. Example: EG60G60GE. TABLE III. ZINC/ZINC ALLOY COATINGS * - HOT DIP PROCESS COATING WEIGHT ONE SIDE ONLY COATING CLASS OBSOLETE NAVISTAR DESIGNATION oz/ft2* MINIMUM SINGLE SPOT TEST g/m2MAXIMUM SINGLE SPOT TEST g/m20
43、0 - 0 0 01 G01 or A01 No Min. No Max. 20 - 20 6040 A40 40 80 50 - 50 10060 G60 or A60 60 110 70 - 70 12090 - 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 WEIGHT
44、ONE SIDE ONLY COATING CLASS OBSOLETE NAVISTAR DESIGNATION oz/ft2* MINIMUM SINGLE SPOT TEST g/m2MAXIMUM SINGLE SPOT TEST g/m200 - 0 0 20 - 20 4030 - 30 5040 A40 40 70 50 - 50 8060 G60 or A60 60 90 70 - 60 110 90 - 90 13098 G90 98 140Suppliers are required to assume all patent liability. 2008 by Navis
45、tar, Inc. OCTOBER 2008 Page 5 of 7 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: TITLE: Low Carbon Steel, Flat Rolled And CURRENT ISSUE DATE: CEMS A-6, PART II Structura
46、l Shapes Part II. Coated Sheet Steel October 2008 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. * The type of zinc/alloy coating is indicated by a suffix letter following the Class designation. * Obsolete c
47、lasses are shown for reference only and should not be used in new design. 6.2.2.3 Coating Option: The supplier may substitute electrogalvanized coatings of the same type and weight for hot dip galvanized coatings at his option. 7.0 QUALITYCoated sheet and strip products will exhibit a uniform surface appearance, and be free from injurious defects such as blisters and bare spots detrimental to fabrication and/or function of the part. Material identified by an E suffix (exposed parts) shall be free
