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EN 10028-6 is a European standard for flat products made of weldable fine grain structural steels in the quenched and tempered condition. These steel plates are designed for use in high-pressure vessels and equipment. The grades covered under this specification offer enhanced toughness and high strength, making them suitable for critical applications in industries such as oil and gas, chemical processing, and power generation.



P335Q, P335QL1, P335QL2, P335QH: These are high-strength steel plates primarily used in pressure vessels. The "Q" stands for quenched and tempered, while the "L" refers to low-temperature toughness. P335QL1 and P335QL2 have higher toughness properties than P335Q. P335QH is designed for specific heat treatment.
P460Q, P460QL1, P460QL2, P460QH: These grades are known for their excellent strength and toughness. The P460 series is suitable for low-temperature applications, with the "QL" grades offering improved performance at sub-zero temperatures.



P500Q, P500QL1, P500QL2, P500QH: Offering a balance of high strength and toughness, these plates are often used in more demanding environments such as offshore platforms. The QL1 and QL2 grades provide better toughness at low temperatures.
P690Q, P690QL1, P690QL2, P690QH: These are some of the highest-strength steel grades in this specification, suitable for very high-pressure applications. They offer excellent weldability along with high tensile strength and toughness, making them ideal for heavy industrial use.


Grade Category Description
P335Q Quenched & Tempered Steel Suitable for high-pressure applications with enhanced strength and toughness.
P335QL2 Low-Temperature Steel Designed for use in extreme low temperatures with superior toughness.
P335QH High-Strength Steel Optimized for high-pressure vessels and provides excellent heat resistance.
P335QL1 Low-Temperature Steel Impact tested at low temperatures, suitable for cold environments.
P460Q Quenched & Tempered Steel High-strength steel for pressure vessels in high-temperature applications.
P460QH High-Strength Steel Superior heat resistance for use in demanding high-temperature environments.
P460QL1 Low-Temperature Steel Designed for low-temperature pressure vessels with enhanced strength and toughness.
P460QL2 Low-Temperature Steel Provides increased toughness in extreme cold conditions compared to QL1.
P500Q Quenched & Tempered Steel High-strength steel for pressure vessels in high-temperature applications.
P500QH High-Strength Steel Excellent heat resistance for high-temperature pressure vessel applications.
P500QL1 Low-Temperature Steel Designed for pressure vessels in low-temperature environments, offering good toughness.
P500QL2 Low-Temperature Steel Provides better low-temperature toughness and durability than QL1.
P690Q Quenched & Tempered Steel Extremely high-strength steel for pressure vessels under high temperatures.
P690QH High-Strength Steel Superior heat resistance and strength for high-pressure applications.
P690QL1 Low-Temperature Steel Suitable for low-temperature applications with high strength and toughness.
P690QL2 Low-Temperature Steel Enhanced toughness and strength for extreme cold environments.



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