Ferro Fundido

For Passenger Car and Light Truck

Underbody Structural Components

Prepared by

Light Truck Frame Project Team

Auto/Steel Partnership

2000 Town Center, Suite 320

Southfield, Michigan 48075-1123

1999

The following companies are members of the Auto/Steel Partnership:

AK Steel Corporation

Bethlehem Steel Corporation

DaimlerChrysler Corporation

Dofasco Inc.

Ford Motor Company

General Motors Corporation

Ispat Inland Inc.

LTV Steel Company

National Steel Corporation

Rouge Steel Company

Stelco Inc.

U.S. Steel Group, a Unit of USX Corporation

WCI Steel, Inc.

Weirton Steel Corporation

This publication was prepared by:

Auto/Steel Partnership

Light Truck Frame Project Team

2000 Town Center, Suite 320

Southfield, Michigan, 48075-1123

First Edition, December 1999

This publication is for general information only. The material contained herein should not be

used without first securing competent advice with respect to its suitability for any given

application. This publication is not intended as a representation or warranty on the part of

Auto/Steel Partnership - or any other person named herein - that the information is suitable

for any general or particular use or freedom from infringement of any patent or patents.

Anyone making use of the information assumes all liability arising from such use.

For more information or additional copies of this publication, please contact the

Auto/Steel Partnership, 2000 Town Center, Suite 320, Southfield, MI 48075-1123 or

phone: [phone], fax: [phone], web site: www.a-sp.org

Copyright 1999 Auto/Steel Partnership. All Rights Reserved.

V

Table of Contents

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VII

Executive Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VIII

1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.1 Definition of Basic Corrosion Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.2 Crevice Corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

1.3 Pitting Corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

1.4 Galvanic Corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

1.5 Cosmetic Corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

2.0 Steel Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2.1 Current Method for Specifying Low-Carbon Steel . . . . . . . . . . . . . . . . . . . . . . . 2-1

2.2 Current Method For Specifying High-Strength

and Ultra High-Strength Steel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

2.3 Former Methods for Specifying Low-Carbon Steel . . . . . . . . . . . . . . . . . . . . . . 2-2

3.0 Coatings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3.1 Application Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3.2 Conversion Coatings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3.3 Hot Melt Wax Coatings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3.4 Electrocoat (E-Coat) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

3.5 Metallic Coatings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

3.6 Organic Coatings . . .