SA516 Gr70 Steel Plate

Description

SA516 Gr70 Steel Plate is a carbon manganese steel plate for medium and low temperature pressure vessels according to ASME/ASTM standards. Its core characteristics are high strength, excellent low-temperature toughness, and superior weldability. It is widely used in pressure-bearing equipment in the petroleum, chemical, and power plant industries. It is a type of Pressure Vessel Steel Plate. The A516 Pressure Vessel Steel Plate series also includes Grade 55, Grade 60, and Grade 65.

Features of SA516 Gr70 Steel Plate:

1. High Strength Grade: SA516 Gr70 Steel Plate has a tensile strength of 485~620 MPa (70 ksi) and a yield strength ≥260 MPa, making it the highest strength grade in the SA516 series, capable of withstanding high working pressures.

2. Excellent Low-Temperature Toughness: SA516 Gr70 Steel Plate undergoes normalizing treatment to refine the grain, maintaining high impact energy (≥34J) even at -30℃ and even -46℃, effectively preventing low-temperature brittle fracture.

3. Excellent weldability and machinability: Low carbon equivalent (typically ≤0.49%), strictly controlled sulfur and phosphorus content (P, S ≤0.035%), supports various welding processes, less prone to cold cracking after welding, and smooth forming and processing.

4. Corrosion resistance and tear resistance: Low sulfur and phosphorus design enhances resistance to lamellar tearing; derivative grades (such as Gr70N or HIC version) are specially smelted and possess resistance to wet hydrogen sulfide corrosion (HIC/SSCC), suitable for acidic oil and gas environments.

5. Heat treatment requirements: SA516 Gr70 Steel Plate thickness >40mm must be delivered normalized; thickness ≤40mm, if notch toughness is required, also requires normalizing to ensure uniform microstructure and stable performance.

6. Purity control: Smelted from fully killed steel; some high-end applications require vacuum degassing and calcium treatment to reduce non-metallic inclusions and improve Z-axis properties.

Applications of SA516 Gr70 Steel Plate:

SA516 Gr70 Steel Plate is a carbon steel plate for medium and low temperature pressure vessels. Its core application is in manufacturing pressure-bearing equipment that withstands medium and low temperatures and high pressures, requiring high weldability and toughness.

1. Petrochemical Industry: SA516 Gr70 Steel Plate is widely used in the manufacture of key equipment such as reactors, heat exchangers, separators, desulfurization towers, and hydrogenation reactors. In acidic environments containing hydrogen sulfide (wet H₂S), a hydrogen-induced cracking (HIC) resistant version of SA516 Gr70 is often selected to resist corrosion.

2. Energy and Power Industry: SA516 Gr70 Steel Plate is used in the manufacture of steam drums, superheater headers, high-pressure water pipes, and auxiliary structures of nuclear reactor pressure vessels for power plant boilers, adapting to high-temperature and high-pressure steam conditions.

3. Gas storage and transportation: SA516 Gr70 steel plate is the mainstream material for manufacturing spherical tanks, liquefied gas tanks (LPG), liquefied petroleum gas cylinders and LNG cryogenic storage tanks, with excellent low-temperature impact toughness to prevent brittle fracture.

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