EN10028-6 P355QH is a pressure vessel steel plate grade that is widely used in the fabrication of pressure vessels and boilers for low temperature service. This grade is designed to provide excellent performance in environments where low temperatures are a critical factor, making it suitable for applications in the oil, gas, and petrochemical industries.

Chemical Composition:

The chemical composition of P355QH is strictly controlled to ensure the material's mechanical properties and weldability. The typical chemical composition is as follows:

· Carbon (C): ≤ 0.16%

· Silicon (Si): ≤ 0.50%

· Manganese (Mn): ≤ 1.50%

· Phosphorus (P): ≤ 0.025%

· Sulfur (S): ≤ 0.015%

· Aluminum (Al): ≥ 0.020%

· Niobium (Nb): ≤ 0.05%

· Titanium (Ti): ≤ 0.03%

· Vanadium (V): ≤ 0.05%

· Boron (B): ≤ 0.005%

· Chromium (Cr): ≤ 0.30%

· Copper (Cu): ≤ 0.30%

· Molybdenum (Mo): ≤ 0.08%

· Nickel (Ni): ≤ 0.30%

· Nitrogen (N): ≤ 0.012%

Mechanical Properties:

The mechanical properties of P355QH are characterized by its high strength and toughness, which are crucial for pressure vessel applications. The typical mechanical properties are as follows:

· Yield Strength: ≥ 355 MPa

· Tensile Strength: 480 - 620 MPa

· Elongation: ≥ 22%

· Impact Energy (at -20°C): ≥ 40 Joules

Heat Treatment:

P355QH steel plates are supplied in the normalized condition. Normalization is a heat treatment process that involves heating the steel to a temperature above its critical point, holding it for a specific time, and then cooling it in air. This process refines the grain structure and improves the mechanical properties of the steel.

Low-Temperature Impact Test:

P355QH is subjected to a low-temperature impact test to ensure its toughness at sub-zero temperatures. The material must meet the specified impact energy requirements at -20°C, demonstrating its suitability for low-temperature applications.

Available Dimensions:

TJC Steel Group offers P355QH pressure vessel steel plates in a wide range of sizes to meet the diverse needs of our customers. The typical available dimensions are:

· Thickness: 6mm - 300mm

· Width: 1500mm - 4000mm

· Length: 3000mm - 18000mm

Main Applications:

P355QH steel plates are primarily used in the fabrication of pressure vessels, boilers, and storage tanks that operate at low temperatures. Some of the typical applications include:

· Liquefied Petroleum Gas (LPG) tanks

· Cryogenic vessels

· Pressure equipment in chemical plants

· Oil and gas industry storage tanks

· Nuclear power plant components

TJC Steel Group Supply Cases:

TJC Steel Group has extensive experience in supplying P355QH steel plates to various industries worldwide. Our supply cases include:

· Supplying P355QH steel plates for a major oil refinery in the Middle East, where the material was used in the construction of high-pressure reactors.

· Providing P355QH steel for a European chemical company's cryogenic storage tanks, ensuring the material's suitability for low-temperature applications.

· Delivering P355QH steel plates to a North American gas company for the construction of their LNG storage facilities, meeting stringent safety and performance standards.

In conclusion, EN10028-6 P355QH is a high-quality pressure vessel steel plate that offers excellent mechanical properties and is well-suited for low-temperature applications. TJC Steel Group is a trusted supplier of P355QH steel plates, with a proven track record of delivering high-performance materials to meet the demands of the most challenging projects.