P460Q is a high-strength, weldable fine-grain steel grade standardized under EN 10028-6. It is specifically designed for use in pressure vessels, boilers, and high-load structural components.
Breakdown of the Designation
P: Indicates its intended use for Pressure purposes.
460: Represents the minimum yield strength of 460 MPa (for thicknesses ≤ 50mm).
Q: Stands for the Quenched and Tempered delivery condition, which optimizes its strength and toughness.
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P460Q Chemical Composition |
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Grade |
The Element Max (%) |
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C |
Si |
Mn |
P |
S |
N |
B |
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P460Q |
0.18 |
0.50 |
1.70 |
0.025 |
0.015 |
0.015 |
0.005 |
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Mo |
Cu |
Nb |
Ni |
Ti |
V |
Zr |
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0.50 |
0.3 |
0.05 |
0.5 |
0.03 |
0.06 |
0.05 |
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Grade |
P460Q Mechanical Property |
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Thickness |
Yield |
Tensile |
Elongation |
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P460Q |
mm |
Min Mpa |
Mpa |
Min % |
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6-50 |
460 |
550-720 |
19% |
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50-100 |
440 |
550-720 |
19% |
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100-150 |
400 |
500-670 |
19% |
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applications
Offshore and marine structures
P460Q is commonly used in offshore platforms, jackets, riser supports, and shipbuilding components due to its high strength, good toughness, and excellent weldability, which ensure structural integrity under harsh marine environments and dynamic loading conditions.
Pressure vessels and boilers
Thanks to its high yield strength and good creep resistance, P460Q is suitable for the fabrication of pressure vessels, storage tanks, and boiler components that operate under high pressure and temperature, helping to reduce wall thickness and overall weight.
Heavy engineering and construction machinery
It is widely applied in large cranes, hydraulic supports, and heavy-duty machine frames, where its high strength-to-weight ratio improves lifting capacity and structural stability while minimizing equipment weight.
Bridges and large-span structures
P460Q is used in the construction of long-span bridges, arch bridges, and steel trusses, providing high load-bearing capacity, good fatigue resistance, and reliable performance under variable weather and traffic loads.
application conditions
Low‑temperature environments
P460Q is suitable for use in regions where temperatures drop to -20℃ or lower, such as offshore areas, northern construction sites, and cold‑climate industrial facilities. Its excellent low‑temperature toughness ensures resistance to brittle fracture under these conditions.
High‑load and heavy‑duty working conditions
It is used in structures subjected to large static, dynamic, or cyclic loads, including crane booms, offshore platforms, and pressure vessels. Its high yield strength and fatigue resistance maintain structural stability under long‑term heavy loading.
Welding‑intensive fabrication conditions
P460Q performs well in projects requiring extensive welding, such as bridge construction and modular fabrication. Its low carbon equivalent reduces the risk of cold cracking, allowing welding in both workshop and on‑site environments.
Corrosive or harsh operating conditions
When combined with proper coatings or corrosion‑resistant treatments, P460Q is used in marine, offshore, and industrial settings where exposure to humidity, saltwater, or chemicals is common. Its durability ensures long service life under such conditions.
P460Q Steel Processing Flow
Raw Material Preparation: Select high-quality molten steel that complies with EN 10025-6 standards as the raw material. Conduct chemical composition testing (e.g., carbon, manganese, chromium content) and mechanical property pre-inspection to eliminate unqualified raw materials and lay a solid foundation for subsequent processing.
Smelting and Casting: Smelt the qualified raw materials in an electric arc furnace or converter, controlling the smelting temperature at 1600-1650℃ to ensure full fusion. Then cast the molten steel into ingots or continuous casting slabs through continuous casting technology, avoiding defects such as porosity and shrinkage.
Quenching and Tempering Treatment: Heat the cast slabs to 880-920℃ for quenching, hold for a certain time to make the steel fully austenitize, then cool rapidly with water or oil. Subsequently, temper at 550-650℃ to reduce internal stress, improve toughness, and form a stable tempered sorbite structure.
Hot Rolling and Forming: Perform hot rolling on the heat-treated steel slabs at 1100-1200℃, rolling them into plates, strips, or profiles of specified thickness and size. Conduct cold bending, stamping, or welding forming according to engineering needs, ensuring the forming accuracy and surface quality.
Final Inspection and Finishing: Carry out surface defect detection (e.g., ultrasonic testing, magnetic particle testing) and mechanical property verification (yield strength, impact toughness). Finally, perform derusting, coating, and cutting to obtain finished P460Q steel products that meet application requirements.
Variants based on Temperature Quality
Depending on the specific impact testing requirements, the grade may have different suffixes:
P460Q: Impact tested at -20°C.
P460QL1: Impact tested at -40°C.
P460QL2: Impact tested at -60°C.
For more details about GNEE's steel products, contact us at beam@gneesteelgroup.com. We look forward to working with you.
What is the delivery state of P460Q?
P460Q is usually delivered in the normalized state, which is the standard delivery state specified in the EN 10028 standard. The normalized state ensures uniform structure and stable mechanical properties of the steel.
Can P460Q be used in offshore oil and gas equipment?
P460Q can be used in some offshore oil and gas equipment, such as onshore pressure vessels and pipelines. For offshore platforms exposed to saltwater, additional anti-corrosion measures or marine-grade steels are needed.
What is the thermal conductivity of P460Q?
The thermal conductivity of P460Q is about 45 W/(m·K) at room temperature, similar to other low-alloy steels. This parameter is important for heat transfer calculation in boiler and heat exchanger design.
What is the coefficient of thermal expansion of P460Q?
The coefficient of thermal expansion of P460Q is about 11.5×10⁻⁶ /℃ (room temperature to 500℃). This value is used to calculate thermal deformation of equipment during heating and cooling processes.
How to store P460Q plates?
P460Q plates should be stored in a dry, well-ventilated warehouse to avoid moisture and rust. They should be placed on wooden pallets away from the ground and corrosive substances, and covered with waterproof cloth if necessary.
What is the impact energy requirement of P460Q?
The impact energy of P460Q (Charpy V-notch) is usually not less than 30 J at 20℃. This ensures the steel has sufficient toughness to resist sudden impact loads in service.
Can P460Q be welded with carbon steel?
Yes, P460Q can be welded with carbon steel using appropriate welding materials and processes. However, attention should be paid to the matching of weld strength and the control of welding heat input to avoid joint defects.
What is the application limit of P460Q in terms of temperature?
P460Q is suitable for working temperatures between -20℃ and 450℃. Beyond this range, its mechanical properties may degrade, so it is not recommended for use in extremely high or low temperature environments.
What inspection methods are used for P460Q after welding?
After welding, P460Q welds are usually inspected by non-destructive testing methods, such as ultrasonic testing (UT), radiography testing (RT) and magnetic particle testing (MT), to detect internal and surface defects.
What is the market demand for P460Q?
The market demand for P460Q is stable, mainly driven by the development of petrochemical, power generation and chemical industries. With the expansion of industrial infrastructure, its demand is expected to remain steady in the future.