P690QL1 steel plate

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.

Thickness: 6MM to 300MM,

Width: 1500mm to 4050mm,

Length: 3000mm to 15000mm

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 Equivalent: Ceq = 【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%

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:

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.