EN10028-6 P690QH is a high-strength quenched and tempered steel grade designed for use in pressure vessel applications where high performance at low temperatures is required. This grade is part of the European standard for flat products for pressure equipment, and it is widely recognized for its exceptional mechanical properties and reliability under extreme conditions.

Chemical Composition:

The chemical composition of P690QH is tightly controlled to ensure the necessary strength and toughness for pressure vessel applications. The typical chemical composition includes:

· Carbon (C): ≤ 0.18%

· Silicon (Si): ≤ 0.50%

· Manganese (Mn): ≤ 1.50%

· Phosphorus (P): ≤ 0.020%

· Sulfur (S): ≤ 0.010%

· Nickel (Ni): ≤ 1.50%

· Chromium (Cr): ≤ 0.30%

· Molybdenum (Mo): ≤ 0.10%

· Niobium (Nb): ≤ 0.06%

· Titanium (Ti): ≤ 0.05%

· Vanadium (V): ≤ 0.10%

· Boron (B): ≤ 0.005%

Mechanical Properties:

The mechanical properties of P690QH are characterized by its high yield strength and tensile strength, which are typically:

· Yield Strength: ≥ 690 MPa

· Tensile Strength: 770 - 940 MPa

· Elongation: ≥ 16%

Heat Treatment:

P690QH is supplied in the quenched and tempered condition, which is essential for achieving its superior mechanical properties. The heat treatment process involves heating the steel to a high temperature followed by rapid cooling, typically in water, and then tempering at a lower temperature to reduce brittleness and improve toughness.

Low-Temperature Impact Test:

P690QH is subjected to a Charpy V-notch impact test at -40°C, ensuring that the material maintains adequate toughness at low temperatures. The typical impact energy value is ≥ 40J.

Available Dimensions:

TJC Steel Group offers P690QH in a wide range of sizes to meet various project requirements. The available dimensions include:

· Thickness: 6mm to 300mm

· Width: 1500mm to 4020mm

· Length: 3000mm to 18000mm

Main Applications:

Due to its excellent mechanical properties and resistance to low-temperature environments, P690QH is commonly used in the fabrication of:

· Pressure vessels

· Storage tanks

· Reactors

· Heat exchangers

· Columns and separators in the petroleum and chemical industries

· Equipment for the liquefied natural gas (LNG) industry

TJC Steel Group Supply Cases:

TJC Steel Group has a proven track record of supplying P690QH steel plates to various industries worldwide. One notable supply case involved the delivery of 120 tons of P690QH steel plates for a large-scale LNG project in Asia. The plates were used to construct cryogenic pressure vessels, and TJC's ability to provide material that met the stringent requirements of the project was highly appreciated by the client.

In another instance, TJC supplied P690QH steel to a European chemical plant, where the material was used to manufacture high-pressure reactors. The steel plates were delivered in various sizes, with thicknesses up to 150mm, and the client commended TJC for the quality and consistency of the material.

In conclusion, EN10028-6 P690QH is a premium grade of pressure vessel steel that offers exceptional strength and toughness, making it suitable for demanding applications in harsh environments. TJC Steel Group's extensive experience in supplying P690QH ensures that clients receive high-quality material that meets their specific project needs.