Steels coated with Alusi aluminum-silicon alloy: specific applications

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1 Automotive Worldwide Steels coated with Alusi aluminum-silicon alloy: specific applications Extract from the product catalogue -European edition Note: Information contained in this catalogue is subject to change. Please contact our sales team whenever you place an order to ensure that your requirements are fully met. Please contact us if you have a specific requirement that is not included in the range of products and services covered by this catalogue. We are also reachable by the address automotive.request@arcelormittal.com.

2 We are also reachable by the address Steels coated with Alusi aluminum-silicon alloy: specific applications Aluminized steels Applications Exhaust systems Alusi coating withstands temperatures of up to 650 C and even 800 C (ArcelorMittal 55+AS steel) without scaling or delamination and exhibits excellent corrosion resistance. For these reasons it is widely used in exhaust systems. For each major exhaust system component, there is an Alusi grade meeting performance requirements in service. Primary downpipe Catalytic converter Catalytic converter/ Front muffler/ Particle Filter muffler connection intermediate pipe Rear muffler Internal: C External: C Hot gas, Internal: condensates Aggression Hot gas, salt, mud Hot gas, salt, mud Hot gas, salt, mud salt, mud External: atmosphere, salt, mud Internal casing: ArcelorMittal 53+AS External casing: Grade ArcelorMittal 55+AS ArcelorMittal 55+AS ArcelorMittal 55+AS ArcelorMittal 55+AS ArcelorMittal 54+AS Pipe: ArcelorMittal 51+AS -ArcelorMittal 52+AS Temperature C C C C TM In the exhaust system application, a coating weight of 150 g/m² and the use of Easyfilm can further increase corrosion resistance. The ArcelorMittal 55+AS grade, specifically developed to guarantee coating integrity up to 800 C and to resist high-temperature oxidation, is recommended for parts upstream of the front muffler. Corrosion resistance comparison: Galvanised/galfan/Alusi in salt spray 2

3 High temperature cyclic oxidation comparison Secondary processing -Welding Most welding techniques (spot, seam, high frequency) and the MIG, MAG and TIG processes can be applied on Alusi without special equipment. Heat shields As a result of its very good reflectivity and resistance to high temperature and corrosion, the Alusi coating is suitable for use in the following applications: Engine heat shields, Underbody heat shields. The mechanical properties of the Alusi coating under ambient and high temperatures allow for the use of very thin coating layers, thus reducing material costs as compared to alternative rival solutions. Reflectivity -Thermal insulation Alusi coating offers excellent thermal insulation properties due to its high level of reflectivity. Its aluminized surface reflects about 80% of the radiation emitted by a heat source between 200 and 600 C. Alusi ArcelorMittal 54+AS Stiffness -Resistance to high temperature -Creep resistance At ambient temperature, Alusi sheet exhibits substantially higher stiffness than other solutions. At high temperature, Alusi retains excellent mechanical properties, lending it good creep resistance. This makes it suitable for use in the following environments: Engines, manifolds and catalytic converters, 3

4 Engines, manifolds and catalytic converters, Underbodies with very low clearance Creep resistance: Comparison Steel/Other indicative solution Mass savings: low gauge dimensions, down to 0.25 mm Alusi sheet can be provided in low gauge dimensions, resulting in lighter heat shields. ArcelorMittal can produce Alusi sheet in 0.25 mm thickness, allowing the design of heat shields with a weight reduction of 50% compared to a conventional solution with a thickness of 0.5 mm. Stiffness and improved drawability: the embossed aluminized steel solution To reduce gauge dimensions while maintaining sufficient component stiffness, ArcelorMittal offers embossed Alusi sheet. Embossing facilitates secondary processing by simplifying the range of equipment and reducing the number of drawing operations required to produce the component. Embossing also improves the vibratory behavior and increases the stiffness of the component. Embossed aluminized steels with a thickness of 0.25 mm are particularly competitive compared to alternative materials. The combination of improved drawability and stiffness makes it possible to design heat shields in Alusi 0.25 mm, generating significant reductions in material costs compared to other materials. Embossed Alusi heat shield in ArcelorMittal 54+AS 120 (thickness: 0.4 mm) Embossed Alusi heat shield in ArcelorMittal 54+AS 120 (thickness: 0.25 mm) 4

5 Alusi heat shield in ArcelorMittal 54+AS 120 (thickness: 2 x 0.3 mm) Alusi catalytic converter heat shield in ArcelorMittal 55+AS 120 (thickness: 0.5 mm) Fuel tanks and filters The excellent resistance of Alusi steel to the corrosion caused by gasoline, diesel and biodiesel fuels and its external corrosion resistance and deep-drawability recommend it for use in metal fuel tanks and fuel filters. The ArcelorMittal 56+AS grade-55 g/m² double-sided, for example-is ideal for this type of application. Alusi steels fully meet fuel permeation standards and recycling and biodiesel compatibility requirements. Fuel tank shell Corrosion resistance The corrosion resistance of Alusi coating has been demonstrated in a variety of fuel and atmospheric corrosion tests. The results show that the aluminized steel solution offers a metal fuel tank service life of 15 years. Welding Most welding techniques can be used to join shells (seam, Soudronic ) and other parts (MIG, MAG, braze-welding, etc.). Deep drawing /Fuel filter To cater to the demand in diesel filters made of Alusi steel, ArcelorMittal has developed the ArcelorMittal 56+AS grade with low coating TM weight and a final surface treatment (Easyfilm ), which preserves coating integrity and adhesion. 5

6 To cater to the demand in diesel filters made of Alusi steel, ArcelorMittal has developed the ArcelorMittal 56+AS grade with low coating TM weight and a final surface treatment (Easyfilm ), which preserves coating integrity and adhesion. This combination is compatible with biodiesel. Fuel filter Available grades ArcelorMittal quality Use ArcelorMittal 51+AS ArcelorMittal 52+AS ArcelorMittal 53+AS ArcelorMittal 54+AS Roll forming -Lock seaming Average drawing Difficult drawing Difficult drawing Very difficult drawing 600 < T < 800 C Extra-deep drawing ArcelorMittal 55+AS ArcelorMittal 56+AS ArcelorMittal 57+AS Thickness > 0.7 and < 1.5 mm Extra-deep drawing YS (MPa) UTS (MPa) ef (%) Lo = 80 mm Mechanical properties for thickness > 0.7 mm. (Mechanical properties for thickness < 0.7 mm: provided on consultation.) Alusi is also available in several strength grades. Please consult us for further details. ArcelorMittal Last update: r n (90 ) (90 )