EN10028-6 P690QL1 is a pressure vessel steel grade with high yield strength, primarily used in the fabrication of welded pressure vessels and industrial boilers where high strength and excellent toughness at low temperatures are required. This grade is part of the European standard for flat products for pressure equipment, and it is designed to withstand severe conditions typically found in petrochemical, chemical processing, and power generation industries.

Chemical Composition:

The chemical composition of EN10028-6 P690QL1 is strictly controlled to ensure the material's mechanical properties and weldability. The typical chemical composition is as follows:

· Carbon (C): ≤ 0.18%

· Silicon (Si): ≤ 0.60%

· Manganese (Mn): ≤ 1.70%

· Phosphorus (P): ≤ 0.025%

· Sulfur (S): ≤ 0.015%

· Nickel (Ni): ≤ 2.50%

· Chromium (Cr): ≤ 0.30%

· Molybdenum (Mo): ≤ 0.10%

· Copper (Cu): ≤ 0.30%

· Niobium (Nb): ≤ 0.05%

· Titanium (Ti): ≤ 0.03%

· Vanadium (V): ≤ 0.05%

· Boron (B): ≤ 0.005%

· Aluminum (Al): ≤ 0.020%

Mechanical Properties:

The mechanical properties of P690QL1 are characterized by its high yield and tensile strength, which are crucial for pressure vessel applications. The typical mechanical properties are as follows:

· Yield Strength: ≥ 690 MPa

· Tensile Strength: 770 - 940 MPa

· Elongation: ≥ 14%

· Impact Energy (at -40°C): ≥ 40J

Heat Treatment:

The steel plates are generally supplied in the quenched and tempered condition to achieve the desired mechanical properties. The heat treatment process involves heating the steel to a high temperature and then rapidly cooling it, followed by tempering at a lower temperature to reduce brittleness and improve toughness.

Low-Temperature Impact Test:

P690QL1 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 -40°C, demonstrating its suitability for cryogenic applications.

Available Dimensions:

TJC Steel Group offers EN10028-6 P690QL1 in a wide range of sizes to cater to various project requirements. The typical available dimensions are:

· Thickness: 6mm - 150mm

· Width: 1500mm - 4000mm

· Length: 3000mm - 18000mm

Main Applications:

The primary applications of P690QL1 include:

· Pressure vessels

· Industrial boilers

· Heat exchangers

· Storage tanks

· Columns and towers in petrochemical plants

· Pressure equipment in nuclear power plants

TJC Steel Group Supply Cases:

TJC Steel Group has a proven track record of supplying high-quality P690QL1 steel plates to various industries worldwide. One notable supply case involved the delivery of 500 metric tons of P690QL1 plates for a petrochemical plant in Southeast Asia. The plates were used to construct high-pressure reactors, where their superior strength and toughness were crucial for the safe operation of the facility.

In another instance, TJC supplied P690QL1 to a European power company for the construction of a new boiler unit. The steel plates were utilized in the production of the boiler's pressure parts, which required exceptional resistance to creep and fatigue at elevated temperatures.

TJC Steel Group's commitment to quality and customer satisfaction has made it a trusted supplier of P690QL1 and other high-grade steel products. Their extensive experience and state-of-the-art facilities ensure that clients receive materials that meet the highest international standards.

In conclusion, EN10028-6 P690QL1 is a premium-grade pressure vessel steel plate designed for applications requiring high strength and excellent toughness at low temperatures. TJC Steel Group's reliable supply and comprehensive range of sizes make it a preferred choice for critical applications in various industries.