The carbon content of 304H (UNS S30409) is restricted to 0.04–0.10%, which provides optimal high temperature strength.
Carbon content ģ04, 304H and 304L all possess the same nominal chromium and nickel content and thus possess the same corrosion resistance, ease of fabrication and weldability. It is also a common coil material for vaporizers.Įarly SpaceX Starships used SAE 301 Stainless Steel in their construction, before moving over to SAE 304L for the SN7 test tank and Starship SN8 in 2020. 304 stainless steel is also used in the architectural field for exterior accents such as water and fire features. Applications ģ04 stainless steel is used for a variety of household and industrial applications such as food handling and processing equipment, screws, machinery parts, utensils, and car headers.
įor more severe corrosion conditions, when 304 stainless steel is too sensitive to pitting or crevice corrosion by chlorides or general corrosion in acidic applications, it is commonly replaced by 316 stainless steel. It is considered resistant to pitting corrosion in water with up to about 400 mg/L chlorides at ambient temperatures, reducing to about 150 mg/L at 60 ☌.ģ04 stainless steel is also very sensitive at room temperature to the thiosulfate anions released by the oxidation of pyrite (as encountered in acid mine drainage) and can undergo severe pitting corrosion problems when in close contact with pyrite- or sulfide-rich clay materials exposed to oxidation. It is subject to pitting and crevice corrosion in warm chloride environments and to stress corrosion cracking above about 60 ☌. It is also specified in European norm 1.4301.Ĭhemical Composition Type 304 Stainless Steel Chemical Composition, %ģ04 stainless steel has excellent resistance to a wide range of atmospheric environments and many corrosive media. The Japanese equivalent grade of this material is SUS304. In the unified numbering system it is UNS S30400. In the commercial cookware industry it is known as 18/8 stainless steel.
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Outside the US it is commonly known as A2 stainless steel, in accordance with ISO 3506 for fasteners. It is specified by SAE International as part of its SAE steel grades. Hatfield at Firth-Vickers in 1924 and was marketed under the trade name "Staybrite 18/8". It has a higher corrosion resistance than regular steel and is widely used because of the ease in which it is formed into various shapes. It is magnetic, but less magnetic than steel. It is less electrically and thermally conductive than carbon steel. The steel contains both chromium (between 18% and 20%) and nickel (between 8% and 10.5%) metals as the main non- iron constituents. SAE 304 stainless steel is the most common stainless steel.