ASTM A240 316L is a specification issued by the American Society for Testing and Materials (ASTM) that outlines the requirements for chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and general applications. The "316L" designation indicates a low carbon variant of the popular 316 stainless steel grade, which offers enhanced corrosion resistance and improved weldability. The ASTM A240 316L specification covers a range of dimensions, tolerances, mechanical properties, and testing requirements for these stainless steel products. The material is characterized by its composition of chromium, nickel, molybdenum, and a relatively low carbon content, which contributes to its excellent resistance to corrosion in various corrosive environments, including those involving acids, chlorides, and other aggressive chemicals.
The specification defines the chemical composition limits of ASTM A240 316L, including ranges for elements such as chromium, nickel, molybdenum, carbon, manganese, silicon, phosphorus, sulfur, and nitrogen. These composition requirements ensure the desired corrosion resistance, strength, and formability of the material. Mechanical properties, such as tensile strength, yield strength, and elongation, are also specified by ASTM A240 316L. These properties are important considerations for the selection and application of the material in different engineering and industrial contexts.
In addition to mechanical properties, the specification details various testing procedures that the material must undergo to ensure its compliance with the standard. These tests include tension testing, hardness testing, intergranular corrosion testing, and more. These tests help ensure the integrity and quality of the stainless steel products manufactured according to ASTM A240 316L. Overall, ASTM A240 316L plates, sheets, and strips find use in a wide range of applications, including chemical processing equipment, pharmaceuticals, food processing, marine environments, and architectural components, where their combination of corrosion resistance, durability, and versatility makes them a valuable material choice. Manufacturers and users refer to the ASTM A240 316L specification to ensure that the products they produce or utilize meet the required standards for performance and quality.
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Specification:
| Property | Requirement |
| Thickness Range | 0.1875" - 4" (4.76mm - 101.6mm) |
| Width Range | 24" - 72" (609.6mm - 1828.8mm) |
| Length Range | 96" - 240" (2438.4mm - 6096mm) |
| Finish | Hot Rolled, Cold Rolled, Annealed |
| Testing | Tension Test, Hardness Test, Intergranular Corrosion Test, etc. |
Chemical Composition of ASTM A240 316L PLATES
| Element | Composition Range (%) |
| Chromium | 16.0 - 18.0 |
| Nickel | 10.0 - 14.0 |
| Molybdenum | 2.0 - 3.0 |
| Carbon | 0.030 max |
| Manganese | 2.00 max |
| Silicon | 0.75 max |
| Phosphorus | 0.045 max |
| Sulfur | 0.030 max |
| Nitrogen | 0.10 max |
Mechanical Properties of ASTM A240 316L PLATES
| Property | Minimum Value |
| Tensile Strength | 70 ksi (485 MPa) min |
| Yield Strength | 25 ksi (170 MPa) min |
| Elongation | 40% min |
| Hardness | 95 HRB max |
Advantages of ASTM A240 316L PLATES
- 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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Applications Industry
| Pharmaceutical Equipment | Chemical Equipment |
| Sea Water Equipment | Heat Exchangers |
| Heat Exchangers | Gas Processing |
| Condensers | Specialty Chemicals |
| Pulp and Paper Industry | Pharmaceuticals |
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