The 400 series group of stainless steels typically have an 11% chromium and 1% manganese increase, above the 300 series group. This stainless steel series tends to be susceptible to rust and corrosion under some conditions although heat-treating will harden them. The 400 series of stainless steels have a higher carbon content, giving it a martensitic crystalline structure that provides the end product with high-strength and high-wear resistance. The 400 series steels tend to be used in agricultural equipment, gas turbine exhaust silencers, hardware, motor shafts, and more.

Excellent Corrosion Resistance

One of the most important properties of 400 stainless steel is its excellent corrosion resistance. This alloy contains chromium, manganese, silicon, and carbon, which work together to provide superior resistance to a wide range of corrosive environments. Also, 400 stainless steel is resistant to intergranular corrosion, making it an ideal choice for high-temperature applications.

Good Formability and Weldability

400 stainless steel also has good formability and weldability. This alloy can be easily formed and welded using various methods, making it an ideal choice for many applications. Also, 400 stainless steel has good resistance to scaling and oxidation at high temperatures, making it a perfect choice for high-temperature environments.

Good Strength and Toughness

In addition to its excellent corrosion resistance, 400 stainless steel has good strength and toughness. This alloy contains a high percentage of chromium, which provides good strength and hardness. Additionally, 400 stainless steel has good impact resistance and can be heat treated to increase its strength and hardness.

Economical

Another advantage of 400 stainless steel is that it is an economical choice for many applications. This alloy is less expensive than other grades of stainless steel, making it an ideal choice for budget-conscious consumers. Additionally, 400 stainless steel is widely available and easily sourced from various suppliers.

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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