1. 400 SERIES STAINLESS By – Bhavya Steel

2. 400 SERIES STAINLESs • The 400 series group of stainless steels has an 11 percent chromium and 1-percent manganese increase, above the 300 series group. The 400 series is susceptible to rust and corrosion under some conditions. Heat-treating will harden the 400 series. The 400 series of stainless steels have higher carbon content, giving it a martensitic crystalline structure. This provides high strength and high wear resistance. Martensitic stainless steels aren’t as corrosion resistant as the austenitic types.

3. Common Applications • The 400 series includes both ferritic and martensitic steels. • Ferritic steels: non-hardening steels,  ideal for conditions in elevated temperatures. Typical applications for ferritic stainless steels include petrochemical, automotive exhaust systems, heat exchanges, furnaces, appliances and food equipment to name a few. • Martensitic steels: able to be hardened, ideal for a wide variety of common uses. Martensitic stainless steels are used extensively in cutlery, sport knives and multi-purpose tools.

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5. ADVANTAGES AND CHARACTERISTICS OF 400 SERIES STAINLESS STEEL Ferritic, or non-hardenablestainless steels, are classified in the 400 series. This series is known for: •  superior corrosion resistance • resistance to scaling at elevated temperatures • inherent strength greater than carbon steels • provide an advantage in many applications where thinner materials and reduced weight are necessary • Non-hardenableby heat treating • always magnetic Martensitic, or hardenable stainless steels, are classified in the 400 series. This series is known for: • higher levels of carbon than ferritics • ability to be heat treated to a wide range of hardness and strength levels • excellent corrosion resistance •  easily machined • good ductility

6. Types of Grades

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8. Types of Grades

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