ASME SA516 Gr70 Hot rolled boiler steel plate

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Impact Temperature of SA516Gr70

The impact temperature of SA516Gr70 steel plate is a crucial performance indicator, determining its toughness and impact resistance in low-temperature environments.

SA516Gr70 steel plate has a low-temperature impact energy requirement ranging from -29℃ to -50℃. This means that under such conditions, the steel plate must maintain sufficient toughness to withstand impact loads. SA516Gr70 has high yield strength and tensile strength, with a tensile strength of approximately 482 MPa (70 ksi), ensuring stability and safety under high pressure. The yield strength varies depending on thickness but is generally not lower than 230 MPa, with some data indicating it can reach 930 MPa. For plates with a thickness of ≤50mm, the yield strength is typically no less than 260 MPa.

SA516Gr70 Steel PlateToughness

This steel plate maintains high impact toughness at low temperatures, effectively preventing brittle fracture in cold environments. For example, at -20℃, its impact toughness surpasses that of ordinary carbon structural steel, with an impact absorption energy of at least 26J.

Corrosion Resistance

SA516Gr70 steel plate exhibits good corrosion resistance, ensuring stable performance in various corrosive environments.

Weldability

SA516Gr70 steel plate has excellent weldability, allowing for high-quality welds using various welding techniques. This is essential for manufacturing large pressure vessels and structural components.

Specifications of SA516Gr70 Hot Rolled Steel Plate

SA516Gr70 steel plates are available in various specifications to meet the needs of different industries and applications. When selecting a plate, it is recommended to consider specific usage conditions and delivery states. Below are common specification ranges:

1. Thickness

Typically ranges from 8mm to 300mm, though other ranges such as 8mm to 200mm or 8mm to 150mm are also available.

The delivery condition varies by thickness:

For thickness ≤40mm (or ≤1.5 inches, approximately 40mm), plates are typically supplied in rolled condition but can also be ordered in normalized or stress-relieved condition.

For thickness >40mm, plates are supplied in the normalized condition.

2. Width

Common widths: 1500mm to 4020mm

Other ranges include 1600mm to 3900mm, 1800mm to 2500mm, and 2000mm to 2400mm.

3. Length

Standard lengths: 3000mm to 18000mm

Other available ranges: 6000mm to 14000mm, 7000mm to 12000mm.

4. Common Size Examples

8mm × 1500mm × 8000mm

10mm × 2500mm × 10000mm

12mm × 2200mm × 11200mm

Delivery Conditions of SA516Gr70 Steel Plate

1. Main Delivery Conditions

Hot Rolled (HR):

The plate is delivered directly after high-temperature rolling.

The surface is rougher, but it has good plasticity and toughness, making it easy to process and weld.

Controlled Rolled (CR):

Rolling is controlled by temperature and reduction parameters to achieve specific microstructure and properties.

This results in more uniform structure and better mechanical performance.

Normalized (N):

The plate is heated above the critical temperature and air-cooled.

This process eliminates residual stress and defects from rolling, improving strength, toughness, and weldability.

Tempered:

Used to further relieve stress and improve toughness and ductility.

Simulated Post-Weld Heat Treatment:

Evaluates changes in plate performance after welding, ensuring weld joint quality.

2. Delivery Condition Marking and Inspection

During delivery, the condition is clearly marked, and quality inspections are conducted according to relevant standards. The inspection includes:

Chemical composition analysis

Mechanical property testing (e.g., yield strength, tensile strength, elongation, etc.)

Non-destructive testing (e.g., ultrasonic testing, radiographic testing)

Surface quality checks

Special Version: SA516Gr70 (R-HIC)

SA516Gr70 (R-HIC) is a specialized version of SA516Gr70 designed for resistance to Hydrogen-Induced Cracking (HIC) and Sulfide Stress Corrosion Cracking (SSC). It is particularly suitable for pressure vessels used in acidic environments, such as those in the refining and chemical industries.

This steel plate undergoes special chemical composition control and heat treatment processes, significantly enhancing its resistance to hydrogen-induced cracking and sulfide stress corrosion cracking, ensuring safe operation in harsh environments.

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