ASTM A240 304 is a specification that covers stainless steel plates, sheets, and strips made from chromium and chromium-nickel alloys. This particular specification is widely used for various applications due to the favorable properties of its stainless steel Type 304, which is the most commonly used grade in this context. The composition of ASTM A240 304 stainless steel typically includes around 18-20% chromium and 8-10.5% nickel. This composition gives it excellent corrosion resistance, making it suitable for use in environments where corrosion is a concern. The sheets made according to this specification are valued for their versatility and ease of shaping. They can be formed into different shapes using common manufacturing techniques like bending, cutting, and welding.
One of the notable aspects of ASTM A240 304 sheets is their corrosion resistance. They are particularly effective in mildly corrosive conditions, making them suitable for applications in industries such as food processing, where hygiene and corrosion resistance are crucial. The sheets also exhibit good heat resistance, although they may not be the best choice for extremely high-temperature environments. The finish of ASTM A240 304 sheets can vary, with options including smooth 2B finish, brushed #4 finish, and bright annealed BA finish. These finishes cater to different aesthetic and functional preferences.
ASTM A240 304 sheets find usage across various industries. They are commonly employed in food processing equipment due to their non-reactive nature, as well as in the chemical industry for their resistance to corrosive substances. Architecturally, these sheets are utilized for both structural and decorative elements, and their biocompatibility makes them suitable for medical equipment as well. Additionally, they are often found in kitchen appliances such as sinks and countertops due to their durability and ease of cleaning. These sheets are available in a range of sizes and thicknesses to accommodate different needs. It's important to ensure that sheets produced under this specification are certified to meet required mechanical and chemical properties. This typically involves testing for properties like tensile strength, yield strength, hardness, and chemical composition. To get the most accurate and up-to-date information about ASTM A240 304 sheets, it's recommended to consult the latest version of the ASTM A240 standard and liaise with stainless steel suppliers or manufacturers.
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Specification:
| Specification | ASTM A240 304 |
| Material | Chromium and Chromium-Nickel Stainless Steel |
| Grade | Type 304 |
| Composition | 18-20% Chromium, 8-10.5% Nickel, Iron, Carbon, and others |
| Corrosion Resist. | Excellent corrosion resistance in mild environments |
| Formability | Excellent, easily formed through bending, cutting, welding |
| Surface Finish | Various options including 2B, #4, and BA |
| Applications | Food processing, chemical industry, architecture, medical |
| Sizes | Various sizes available, thicknesses from 0.4 mm to 100+ mm |
| Heat Resistance | Good heat resistance for general-purpose applications |
| Certification | Sheets should be certified for mechanical and chemical properties |
Chemical Composition of ASTM A240 304 SHEETS
| Element | Composition Range |
| Chromium (Cr) | 18.0 - 20.0% |
| Nickel (Ni) | 8.0 - 10.5% |
| Carbon (C) | 0.08% max. |
| Manganese (Mn) | 2.0% max. |
| Silicon (Si) | 0.75% max. |
| Phosphorus (P) | 0.045% max. |
| Sulfur (S) | 0.03% max. |
Mechanical Properties of ASTM A240 304 SHEETS
| Property | Value |
| Tensile Strength | 75 ksi (515 MPa) min. |
| Yield Strength (0.2%) | 30 ksi (205 MPa) min. |
| Elongation | 40% min. |
| Hardness | Brinell 201 max. |
Advantages of ASTM A240 304 SHEETS
- Good general corrosion resistance and high strength
- Good sulfide stress corrosion resistance
- Resistance to chloride pitting and crevice corrosion
- Higher resistance to chloride stress corrosion cracking
- Easy to weld and conform
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