Feature of ASME SA 516 Grade 70N NACE and HIC Plates
ASME SA 516 Grade 70N NACE and HIC plates are specialized types of steel plates used in pressure vessel and boiler applications, particularly in industries where resistance to hydrogen-induced cracking (HIC) and stress corrosion cracking (SCC) is crucial. These plates are typically used in environments where there is a high risk of exposure to hydrogen sulfide (H2S) and other corrosive substances. Here are some of the key features of ASME SA 516 Grade 70N NACE and HIC plates.
>> What is ASME SA 516 Grade 70N NACE and HIC Plates?
ASME SA 516 Grade 70N NACE and HIC plates refer to a specific type of steel plate that is designed for use in pressure vessel and boiler applications in industries where resistance to hydrogen-induced cracking (HIC) and stress corrosion cracking (SCC) is of utmost importance. These plates are built to meet stringent quality and safety standards to ensure the integrity and reliability of pressure vessels and boilers operating in corrosive and high-stress environments. Here’s a breakdown of the key elements:
ASME SA 516 Grade 70N: This designation refers to the specific grade of steel that conforms to the ASME (American Society of Mechanical Engineers) SA 516 standard. Grade 70 is a carbon steel grade commonly used for pressure vessel applications. The “N” in SA 516 Grade 70N signifies that the steel is normalized, which is a heat treatment process that refines the microstructure of the material to enhance its mechanical properties.
NACE: NACE, which stands for the National Association of Corrosion Engineers, has developed standards to address the corrosion resistance requirements for materials used in oil and gas industries and other applications where corrosive environments, such as those with hydrogen sulfide (H2S) exposure, are a concern. ASME SA 516 Grade 70N NACE plates are designed to meet the requirements of NACE MR0175, which is a standard specifying materials that are resistant to sulfide stress cracking in H2S-containing environments.
HIC: HIC, or Hydrogen-Induced Cracking, is a type of corrosion that can occur in steel exposed to hydrogen and tensile stress. ASME SA 516 Grade 70N NACE and HIC plates are engineered to be highly resistant to HIC, making them suitable for environments where hydrogen exposure is a significant concern. These plates have a low susceptibility to hydrogen-induced cracking.
>> Equivalent Grade of ASME SA 516 Grade 70N NACE and HIC Plates
The equivalent grades of ASME SA 516 Grade 70N NACE and HIC plates can vary depending on different international standards and designations. One commonly used equivalent grade is typically EN10028 P355N. The European standard EN10028 is often used as a reference for pressure vessel steel. The equivalent grade P355N has similar properties to ASME SA 516 Grade 70N in terms of its suitability for pressure vessel applications and its resistance to hydrogen-induced cracking (HIC).
The equivalent grade for ASME SA 516 Grade 70N NACE and HIC plates can vary depending on the specific requirements and standards used in different regions and industries. However, a common equivalent grade is often found in the EN 10028-3 standard, which is a European standard for pressure vessel steel. The equivalent grade in this standard is typically P355NH, which has similar properties and is suitable for pressure vessel applications and offers resistance to hydrogen-induced cracking (HIC) and stress corrosion cracking (SCC).
EQUIVALENT GRADE OF A516 GR.70N NACE MR-0175/0103 BOILER PLATES
|British Standard||European Norm||ASTM/ASME||DIN|
|BS1501-224-490A/B||EN10028 P355GH||A/SA516 – Grade 70||–|
>> Specifications of ASME SA 516 Grade 70N NACE and HIC Plates
ASME SA 516 Grade 70N NACE and HIC plates are manufactured to meet specific technical specifications to ensure their suitability for use in high-pressure and corrosive environments. These plates typically adhere to various standards and specifications, including the following:
ASME SA 516/SA 516M: ASME SA 516 is the American Society of Mechanical Engineers standard for carbon steel plates for pressure vessels. The “SA 516/SA 516M” designation refers to the specific standard.
Grade 70N: This designates the specific grade of carbon steel, indicating that it is normalized to improve its mechanical properties.
NACE MR0175: These plates are designed to meet the requirements of NACE MR0175, which is a standard set by the National Association of Corrosion Engineers (NACE). This standard outlines the materials that are resistant to sulfide stress cracking and stress corrosion cracking in environments containing hydrogen sulfide (H2S).
HIC (Hydrogen-Induced Cracking) Resistance: The plates are engineered to be highly resistant to HIC, which is a form of corrosion that can occur in steel exposed to hydrogen and tensile stress.
SCC (Stress Corrosion Cracking) Resistance: They are also designed to be resistant to SCC, which is a type of corrosion that affects metals under tensile stress in the presence of specific corrosive agents.
Normalized Steel: The plates are made from normalized steel, which is a heat treatment process involving heating the steel to a specific temperature and then cooling it in air. Normalizing refines the grain structure of the steel and enhances its mechanical properties, making it suitable for pressure vessel applications.
Charpy V-Notch Impact Testing: These plates typically undergo Charpy V-notch impact testing to assess their toughness, ensuring their suitability for low-temperature applications.
Size and Thickness: The specifications of these plates can vary in terms of size and thickness to accommodate different design and application requirements.
|Grade||ASME SA 516 GR.70N Boiler and Pressure Vessel Steel Plates|
|Supply Condition||As Rolled, Normalized Rolling, Furnace Normalizing, Vacuum Degassing, Simulated Post-Weld Heat Treatment or as per customer requirement.|
|Impact tested||52° C|
|Tempering||Notch toughness can be improved by quenched cooling from hot rolling or normalizing by the supplier. If such a faster cooling rate is agreed upon between purchaser and supplier then the steel is also to be tempered at 1200 F.|
|Applications||Used for weld fabrication of pressure vessels that require improved notch toughness for lower than ambient temperature service.|
|Process of Manufacturing||Hot-Rolled (HR)|
>> Chemical Composition of ASME SA 516 Grade 70N NACE and HIC Plates
The chemical composition of ASME SA 516 Grade 70N NACE and HIC plates typically falls within certain ranges to meet the required mechanical and corrosion-resistant properties. While exact compositions can vary slightly depending on the manufacturer and specific product, here’s a typical chemical composition for SA 516 Grade 70N:
- Carbon (C): 0.27% to 0.31%
- Manganese (Mn): 0.85% to 1.20%
- Phosphorus (P): 0.025% maximum
- Sulfur (S): 0.025% maximum
- Silicon (Si): 0.15% to 0.40%
- Iron (Fe): Balance (remainder of the composition)
CHEMICAL COMPOSITION OF A516 BQ GR.70N NACE AND HIC STEEL PLATES
>> Mechanical Properties of ASME SA 516 Grade 70N NACE and HIC Plates
The mechanical properties of ASME SA 516 Grade 70N NACE and HIC plates are essential for ensuring their performance and safety in pressure vessel and boiler applications. The following are typical mechanical properties for SA 516 Grade 70N:
Tensile Strength: The minimum tensile strength of SA 516 Grade 70N is typically around 70,000 psi (485 MPa) to 90,000 psi (620 MPa), depending on the thickness of the plate.
Yield Strength: The minimum yield strength of SA 516 Grade 70N is approximately 38,000 psi (260 MPa) to 45,000 psi (310 MPa), again depending on the plate’s thickness.
Elongation: The typical elongation at break is 17% to 21%. This measurement indicates how much the material can stretch before it fractures, reflecting its ductility.
Impact Resistance: SA 516 Grade 70N plates are typically tested for impact resistance using Charpy V-notch impact tests at various temperatures. The specific impact energy values can vary based on the thickness and heat treatment but are typically in the range of 27 to 38 joules (20 to 28 ft-lbf).
Hardness: The typical Brinell hardness for SA 516 Grade 70N is around 200 to 260 HB, which indicates the material’s resistance to indentation or deformation.
MECHANICAL PROPERTIES OF NACE MR-0175 RESISTANT STEEL PLATES
|Tensile strength (ksi)||Yield strength (ksi)||Elongation min, % 200 mm (8 in)||Elongation min, % 50 mm (2 in)|
|485-620 (70-90)||260 (38)||17||21|
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