AUTOMOTIVE
Manufacturers in the automotive industry update their offer with solutions that guarantee technical, aesthetic and eco-friendly performances, meeting a new need for environmental sustainability. In this constantly evolving scenario, stainless steel plays a crucial role and is used increasingly often to manufacture various components in all transportation sectors.
In the automotive industry, stainless steel is used for the entire exhaust system – from the manifold to the external cold end – for its superior mechanical and physical properties of heat and corrosion resistance. Furthermore, its pleasant aesthetic appearance makes it the ideal choice for decorative trims, car boot frames, window frames, rear mirror shalls and frames and underbody car protection.
Acciai Speciali Terni’s strategic vision is based on a precise idea: constant commitment to finding new answers and solutions, to help client companies in improving quality thanks to new, high-performing, sustainable and competitive products. Thanks to an integrated approach with ELECTRO WELDED TUBES PRODUCTION and its long history of production experience, AST has indubitably positioned itself as a market reference for the transportation sector.
AST provides dedicated solutions to its clients. For this reason it has developed innovative steel grades for high-temperature applications and with improved formability that ensures excellent performances.
Furthermore, the company’s customer-oriented and reliable approach provides outstanding customer service, covering all the needs
OUR STAINLESS STEELSOLUTIONS FOR AUTOMOTIVE
AUSTENITIC
| 304 | ||||
| EN 1.4301 | ||||
| CHEMICAL ANALYSIS (APPROXIMATE) 1 | Norm | Typical value | ||
| C% | 0.07 | 0.04 | ||
| Cr | 17.5÷19.5 | 18.2 | ||
| Ni | 8-10.5 | 8.1 | ||
| Mo | ||||
| MECHANICAL PROPERTIES 2 | Value | Norm | Typical value | |
| Rm | 540÷750 | 650 | ||
| Rp0,2 | ≤230 | 270 | ||
| A% | ≤45 | 54 | ||
| RESISTANCE TO CORROSION 3 PREN (Pitting Resistance Equivalent Number) |
Min | Max | Med | |
| 18.8 | 21.3 | 20.1 | ||
| DELIVERY CONDITIONS Coils, sheets and strips |
Hot rolled thicknesses 1.85 to 6.5 mm Cold rolled thicknesses 0.35 4 to 5 mm Width up to 1520 mm Finish 1, 2D, 2B, BA, 2E, 2H |
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FERRITIC
| 409LI | ||||
| EN 1.4512 | ||||
| CHEMICAL ANALYSIS (APPROXIMATE) 1 | Norm | Typical value | ||
| C% | ≤0.03 | 0.01 | ||
| Cr | 10.5-12.5 | 11.5 | ||
| Ni | ||||
| Mo | ||||
| MECHANICAL PROPERTIES 2 | Value | Norm | Typical value | |
| Rm | 380÷560 | 420 | ||
| Rp0,2 | ≥220 | 250 | ||
| A% | ≥25 | 32 | ||
| RESISTANCE TO CORROSION 3 PREN (Pitting Resistance Equivalent Number) |
Min | Max | Med | |
| 11.2 | 12 | 11.6 | ||
| DELIVERY CONDITIONS Coils, sheets and strips |
Hot rolled, thickness 2.0 to 6.5 mm Cold rolled, thickness 0.354 to 3 mm Width up to 1520 mm Finish: 1, 2D, 2B Width up to 1520 mm Finish: 1, 2D, 2B, BA |
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SUPER FERRITIC
| 470LI | ||||
| EN 1.4613 | ||||
| CHEMICAL ANALYSIS (APPROXIMATE) 1 | Norm | Typical value | ||
| C% | < 0.03 | 0.01 | ||
| Cr | 22-25 | 24 | ||
| Ni | < 0.50 | |||
| Mo | < 0.50 | |||
| MECHANICAL PROPERTIES 2 | Value | Norm | Typical value | |
| Rm | 430-630 | 490 | ||
| Rp0,2 | > 250 | 330 | ||
| A% | > 18 | 30 | ||
| RESISTANCE TO CORROSION 3 PREN (Pitting Resistance Equivalent Number) |
Min | Max | Med | |
| 23.8 | 25.3 | 24.5 | ||
| DELIVERY CONDITIONS Coils, sheets and strips |
Hot rolled, thickness 5 to 6.5 mm Cold rolled, thickness 0.354 to 3 mm Width up to 1520 mm Finish: 1, 2D, 2B, BA and patterned |
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NOTES/NOTE
| 1 | Approx. chemical composition | Reference values are shown in the table |
| 2 | Mechanical properties | Legend: Rm [Tensile strength] Rp0.2% [Yield strength] A% [Elongation A80 (<3mm) / A5 (≥3mm)] Hardness: [ASTM A 370-05] |
| 3 | Indice di PREN | Corrosion resistance index The ability of stainless steel grades to resist pitting corrosion is expressed by a numeric indicator called PREN (Pitting Resistance Equivalent Number). PREN can be calculated using a mathematical formula, which uses mass-percentage of selected chemical elements found in stainless steel grades as input variables. PREN(Austenitic)=%Cr+3.3(%Mo)+16(%N) – PREN(Ferritic)=%Cr+3.3(%Mo) |
| 4 | The availability of the 0.35 mm thickness will be checked on request. | |
INNOVATIVE SOLUTIONS
There is an increasing demand in the sector for high mechanical performance of the steel used, especially for ferritic stainless steel. AST can offer the automotive industry a wide range of steel grades, specifically developed to meet the diverse needs of this market.
HIGH TEMPERATURE RESISTANCE
To achieve improved efficiency in emission control, the market is now steering towards higher operating temperatures for engines and exhaust systems. In order to operate at temperatures up to 1,000 °C, while ensuring corrosion resistance and excellent formability, AST developed the 441M ferritic grade.
FLEXIBILITY AND VERSATILITY
Our expertise in the supply of highformability materials meets a growing market need for innovative designs, reduced thickness and improved performance. Thus, the new 439MPS and 441PS ferritic grades were designed to guarantee maximum formability and ensure great versatility.
CORROSION RESISTANCE
Cars’ exhaust systems are always in contact with high-temperature gasses and moisture, as well as with a range of chemical compounds. Therefore, new urea tanks have been introduced to reduce CO2 emission. For this purpose Acciai Speciali Terni has fine-tuned stainless steel grades with increasingly high performances, especially in terms of corrosion resistance. Our 470LI superferritic and 444 ferritic steels guarantee excellent resistance to corrosion and contribute to curtailing pollution.
OTHER TRANSPORTATION
Cutting-edge technology allows AST to offer a vast range of steel for the transport sector (buses, trains, subways, lorries, vans, etc.) In the railway industry, for example, AST has developed new solutions in lighter weight steel for freight wagons. The mechanical resistance of special grades of stainless steel results in reduced gauges with a consequent reduction in the vehicle weight and lower fuel consumption. AST stainless steel is also widely used in structural contexts, for example, in bus frames. Other notable advantages are the easy workability and the high mechanical resistance which results in a reduction in the overall weight and high resistance to corrosion due to the self-passivation feature of steel when damaged.
