ASME SA516 Grade 70N Carbon Steel Disc Forged Circle Plate For Pressure Vessel
ASME SA516 Grade 70N Carbon Steel Disc / Forged Circle / Round Blanks
ASME SA516 Grade 70N is a specification for carbon steel plates intended for moderate and lower temperature service. Commonly used in pressure vessels, boilers and petrochemical industries due to its good weldability and formability. The "N" indicates that it has been normalized, which enhances mechanical properties and toughness. The specification covers other grade such as Gr.55, Gr.60, Gr.65, Gr.70.
| Grade | ASTM | ASME | EN | JIS | BS |
|---|---|---|---|---|---|
| Grade 60/70 | A516 | SA516 | 10028-3 | G3103 | 1501-224 Gr 490 |
| Element | Grade 60 (%) | Grade 70 (%) |
|---|---|---|
| Silicon (Si) | 0.15 – 0.40 | 0.15 – 0.40 |
| Chromium (Cr) | 0.40 max | 0.40 max |
| Vanadium (V) | 0.02 max | 0.02 max |
| Copper (Cu) | 0.20 max | 0.20 max |
| Carbon (C) | 0.27 max | 0.28 max |
| Manganese (Mn) | 0.79 – 1.30 | 1.00 – 1.60 |
| Phosphorus (P) | 0.035 max | 0.035 max |
| Sulfur (S) | 0.025 max | 0.025 max |
| Molybdenum (Mo) | 0.08 max | 0.08 max |
| Nickel (Ni) | 0.40 max | 0.40 max |
| ASTM A516 | Grade 55 [380] |
Grade 60 [415] |
Grade 65 [450] |
Grade 70 [485] |
| Tensile strength, ksi [MPa] | 55–75 [380–515] | 60–80 [415–550] | 65–85 [450–585] | 70–90 [485–620] |
| Yield strength, min,a ksi [MPa] | 30 [205] | 32 [220] | 35 [240] | 38 [260] |
| Elongation in 8 in. [200 mm], min, % b | 23 | 21 | 19 | 17 |
| Elongation in 8 in. [50 mm], min, % b | 27 | 25 | 23 | 21 |
| a Determined by either the 0.2 % offset method or the 0.5 % extension-under-load method. b See Specification A20/A20M for elongation adjustment. |
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Manufacturing Process
Forging: Circle plates or round blanks are typically produced through a forging process, which improves the material's mechanical properties compared to cast or rolled products.
Heat Treatment: Normalizing is a standard process to relieve stresses and improve toughness.
Installation and Fabrication
Welding: The plate is often welded to other components during fabrication. Good weldability aids in creating strong joints.
Machining: It can be machined into various shapes and sizes as required for specific applications.
One-Time Use: In many cases, once fabricated into a component (like a vessel or tank), it is a long-term investment for industrial plants.
Application
1. Pressure Vessels
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Application: Used in the construction of pressure vessels that store liquids and gases under pressure.
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Reason: Its strength and toughness make it suitable for withstanding high pressure.
2. Boilers
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Application: Employed in boiler fabrication, where high temperatures and pressures are commonplace.
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Reason: The material can handle extreme conditions without deforming or failing.
3. Storage Tanks
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Application: Used to create storage tanks for chemicals, oil, and other hydrocarbons.
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Reason: Its resistance to corrosion and high performance at various temperatures makes it ideal for long-term storage.
4. Piping Components
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Application: Fabrication of fittings, flanges, and other components that are part of piping systems.
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Reason: The material’s weldability allows for easy integration into piping systems.
5. Industrial Equipment
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Application: Used in various machinery and equipment that require durability and strength.
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Reason: Suitable for components exposed to harsh working environments.
6. Marine Applications
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Application: In some cases, it can be used for marine vessels, particularly in tanks and pressure systems.
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Reason: Its toughness is advantageous in varying conditions at sea.
7. Power Generation
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Application: In steam and gas turbines, particularly in components that are subject to high pressure and temperature.
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Reason: High yield strength and good impact toughness are critical in these applications.
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