1.Chemical composition:
SA516Gr60: carbon content ≤0.3, silicon content 0.13-0.45, manganese content 0.79-1.3, phosphorus content ≤0.035, sulfur content ≤0.035.
SA516Gr65: Carbon content ≤0.26, silicon content 0.15-0.4, manganese content 0.85-1.2, phosphorus content ≤0.035, sulfur content ≤0.035. Compared with SA516Gr60, the carbon content is lower, and the range of manganese content is different.
-SA516Gr70: Carbon content ≤0.31, silicon content 0.13-0.45, manganese content 0.79-1.30, phosphorus content ≤0.035, sulfur content ≤0.035. The carbon content is slightly higher than that of SA516Gr60, and the silicon content range is the same as that of SA516Gr65, but the manganese content range is the same as that of SA516Gr60.
SA516Gr70N: The chemical composition is basically the same as SA516Gr70, but the control of some trace elements may be more stringent to meet special performance requirements such as hydrogen resistance.
2. Mechanical properties:
-SA516Gr60: The tensile strength is between 415-550MPa, the yield strength is generally 240MPa, the elongation is usually between 20%-25%, the impact toughness is good, and the impact work is ≥27MPa at -46°C.
- SA516Gr65: Yield strength ≥240MPa, tensile strength between 450-585MPa, elongation ≥23%, impact function at -30°C or lower temperatures to maintain a high level.
SA516Gr70: Tensile strength of 70 thousand pounds per square inch, that is, greater than 482MPa. When thickness ≤50mm, yield strength ≥260MPa, tensile strength 485-620MPa, elongation ≥21%; When the thickness is > 50-≤ 200mm, the yield strength is ≥260MPa, the tensile strength is 485-620MPa, and the elongation is ≥17%.
SA516Gr70N: Similar in mechanical properties to SA516Gr70, but generally has better resistance to hydrogen induced cracking (HIC) and sulfide stress corrosion (SSCC).
3. Performance characteristics:
SA516Gr60: has good plastic deformation ability, can maintain good toughness in medium and low temperature environment, suitable for general medium and low temperature pressure vessel manufacturing.
-SA516Gr65: has high strength and excellent toughness, excellent hydrogen resistance, and can operate stably in a hydrogen environment for a long time.
SA516Gr70: has high yield strength and tensile strength, has good stability and safety under high pressure, and has good welding performance and corrosion resistance.
- SA516Gr70N: Based on the performance advantages of SA516Gr70, the hydrogen resistance is further enhanced, suitable for medium and low temperature pressure vessel environments with high requirements for hydrogen resistance.
4. Use:
- SA516Gr60 steel plate
- Mainly used in the manufacture of medium and low temperature pressure vessels. For example, in the petrochemical industry, it is used to make some small reactors and shells of storage containers that have not particularly high pressure requirements. In general industrial boilers, it can also be used to manufacture components such as POTS, which work at relatively moderate temperatures and pressures, and SA516Gr60 steel plates can meet their basic strength and toughness requirements.
-SA516Gr65 steel plate
- Widely used in pressure vessels and chemical equipment. In the petroleum refining unit, can be used to manufacture fractionating towers, heat exchangers and other equipment, these equipment need to withstand a certain pressure and temperature, while may be exposed to hydrogen and other corrosive media, SA516Gr65 steel plate hydrogen resistance makes it able to adapt to this environment. In some reaction containers and storage containers in the chemical industry, the advantages of high strength and good toughness can also be played.
- SA516Gr70 steel plate
- Commonly used in large pressure vessels and important structural components. In the petrochemical large container manufacturing industry, such as large spherical tanks, large liquefied petroleum gas storage tanks, etc., its high strength can withstand huge pressure. In the boiler industry, can be used to manufacture high temperature and high pressure boiler drum, header and other key components, these components need to withstand high pressure and temperature, SA516Gr70 steel plate high strength and good stability can ensure the safe operation of equipment.
- SA516Gr70N steel plate
- Mainly used against highly demanding environments with hydrogen embrittlement. In hydrogenation units in the petrochemical industry, such as hydrogenation reactors, hydrogenation refining units, etc., these equipment have been in a high temperature and high pressure environment containing hydrogen for a long time, the anti-hydrogen cracking (HIC) performance and anti-sulfide stress corrosion (SSCC) performance of SA516Gr70N steel plate can effectively prevent the steel plate from being damaged due to hydrogen embrittle and other reasons. To ensure the reliability and safety of the equipment.
5. Delivery status:
These four kinds of steel plates are generally delivered in a normalized state, and can also be normalized + tempering, normalized + quenching and other treatments according to different needs.
In general, with the increase of the number of grades, the strength of the steel plate gradually increases, and there are some slight differences in the chemical composition. SA516Gr70N is an improvement on the basis of SA516Gr70, with better hydrogen resistance. In practical applications, the appropriate steel plate material should be selected according to the specific use environment and requirements.
