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.
wilsonpipeline Stainless stocks the following products in 400 Series stainless steel:
Stainless Steel 400 Series Products
Super Duplex Stainless Steel FlangesDuplex S31803 F51 flange,Duplex Steel S31803 SO Flange,NSI ASME JIS DIN super duplex stainless steel flanges,etc.More Information
Stainless Steel FlangesStainless Steel Welding Neck Flange (WN),316L Stainless Steel Flange,317 Stainless Steel Flange,347 Stainless Steel Flange,etc. More Information
Stainless Steel Pipe FittingsDUPLEX S32750 (SAF 2507) Pipe Elbow,904L Pipe SR/LR Elbow,Stainless Steel 304 Elbow,347H PIPE FITTING,etc. More Information
Stainless Steel Pipes304L 316L Large Diameter Stainless Steel Seamless Pipes,316L/321/304 Cold Drawn Seamless Tube GOST 9941-91,ASTM A269 STPG42 G3456 SCH4O Seamless Stainless Steel Pipes AP/BA Welded Cold Drawn Pipe More Information
GasketsSerrated gasket with outer ring SS316,Spiral serrated metal gasket,Basic type serrated gasket,etc.More Information
Please contact us directly with technical questions .
he 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.
The table below shows common types of 400 series steel:
400 Series Applications
Type 405 a ferritic steel, used especially for welding applications
Type 408heat-resistant; poor corrosion resistance; 11% chromium, 8% nickel.
Type 409cheapest type; used for automobile exhausts; ferritic (iron/chromium only).
Type 410 martensitic (high-strength iron/chromium). Wear-resistant, but less corrosion-resistant.
Type 416easy to machine due to additional sulfur
Type 420Cutlery Grade martensitic; Excellent polishability.
Type 430 decorative steel, used for automotive trim; ferritic. Good formability, but with reduced temperature and corrosion resistance.
Type 440 a higher grade of cutlery steel, with more carbon in it, which allows for much better edge retention when the steel is heat-treated properly.
Type 446 For elevated temperature service
Advantages and Characteristics of 400 Series Stainless Steel
Ferritic, or nonhardenable stainless 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
nonhardenable by 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
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