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18 8 stainless steel strength11/21/2023 Bolts, screws and springs: Especially in industrial and marine applications where corrosion resistance is important.However, manufacturers might need to make a decision between steel types 304L or 304H depending on the properties they require. (500 to 800 oC) What is 304 Stainless Steel Used for?ģ04 stainless steel is used in a variety of applications because of its flexibility and versatility. These include cooking pots, cutlery, kitchen appliances and sinks because of its resistance to corrosion and high tolerance for extreme temperatures. 304H stainless steel is often used in the food industry for a number of applications. It is often used to improve weldability in heavy gauge components.ģ04H is the high carbon form with a carbon content between 0.04 and 0.1%. When used in temperatures above 425 oC, 304L is not as likely to result in carbide precipitation, unlike 304H. The L and H grades relate to the carbon content of the 304 forms of steel, each of which has its own benefits and drawbacks.ģ04L is the low carbon version and has a maximum of 0.3% carbon. There are different grades of 304 stainless steel and the two key grades we will cover in this section are 304L and 304H. ![]() It is therefore important to know this measurement to avoid causing irreversible damage to a steel. When the steel is placed under stress at 205 MPa or higher it will become permanently deformed. The yield strength of 304 stainless steel is at 205 MPa. The tensile strength of 304 stainless steel is at a minimum of 515 MPa and can typical reach 625 MPa as a maximum. The tensile strength of a property describes the maximum amount of stress the steel can withstand before fracturing or breaking. Some of the standard mechanical properties of 304 stainless steel are shown in the table above, but we will look into the tensile strength, elongation A5, hardness and yield strength in more detail in the following section. Mechanical Properties Proof Stress 0.2% (MPa) Yet grade 304’s higher chromium content increases its durability in the presence of oxidizing agents, meaning 304 stainless steel is unlikely to rust. All stainless steel products have this protective layer which self-heals through oxidation, preventing oxidation of the internal structure. The low corrosivity of type 304 is largely due to the high chromium content, which forms a protective passivation layer–or patina–on the alloy’s surface. Chemical Composition UNS Noģ04 stainless steel’s composition promotes good resistance to corrosive media, inhibiting both corrosion and oxidation. Hence the 304 stainless steel is equivalent to EN 1.4301 and SU304. These same general principles apply to other global certifications, so though there’s some variation in vernacular, the different certifications agree on the chemical composition. However, the content of both chromium and nickel can vary upwards by about 2%. That terminology has persisted, so some still refer to 304 stainless steel as 18/8 steel. ![]() Specifying 304 Stainless steelģ04 is the SAE International grading for the composition initially branded as Staybrite 18/8 those figures derive from the ratio of chromium and nickel in the alloy. Although it may be replaced with 316 stainless steel in extremely corrosive environments–especially when severe pitting and crevice corrosion are an issue–304 stainless remains a go-to solution for engineers and manufacturers worldwide. Renowned for its excellent corrosion resistance, grade 304 serves a multitude of purposes, from household to industrial applications. Type 304 stainless steel is one of the most ubiquitous steel grades on the market.
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