what is Ferritic Stainless Steel 410 420 430 430F 440C

Ferritic steels are high chromium, magnetic stainless steels that have a low carbon content.

Known for their good ductility, resistance to corrosion and stress corrosion cracking, ferritic steels are commonly used in automotive applications, kitchenware and industrial equipment.

Types:

Group 1 (type 409/410L): These have the lowest chromium content of all stainless steels and are ideal for slightly corrosive environments where localized rust is acceptable. The least expensive of all stainless steels, type 409 was initially created for automotive exhaust systems silencers, but can now be found in automotive exhaust tubing and catalytic convertor casings. Type 410L is often used for containers, buses聽and LCD monitor frames.

Group 2 (type 430): The most commonly used ferritic steel, type 430 has a higher chromium content and is, consequently, more resistant to corrosion by nitric acids, sulfur gases and many organic and food acids. In some applications, this grade can be used as a replacement for austenitic grade 304. Type 430 is often found in interior appliances, including washing machine drums, kitchen sinks, cutlery, indoor panels, dishwashers and other cooking utensils.

Group 3 (type 430Ti, 439 and 441): Having better weldability and formability characteristics than Group 2 ferritic steels, Group 3 steels can be used to replace austenitic type 304 austenitic in a wider range of applications, including in sinks, exchange tubes, exhaust systems and welded parts of washing machines.

Group 4 (type 434, 436, 444): With a higher molybdenum content, these ferritic stainless steel grades have enhanced corrosion resistance and are used in hot water tanks, solar water heaters, exhaust system parts, electric kettles, microwave oven elements, as well as automotive trip. Grade 444, in particular, has a pitting resistance equivalent (PRE) to Grade 316, allowing it to be used in more corrosive outdoor environments

Group 5 (446, 445, 447): This group of specialty stainless steels is characterized by a relatively high chromium content. The result is steels with excellent corrosion and scaling (or oxidation) resistance. In fact, the corrosion resistance of Grade 447 is equivalent to that of titanium metal. Molybdenum is also commonly added to improve corrosion resistance. Applications for Group 5 steels are found in highly corrosive coastal and offshore environments.

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