P460Q is a kind of pressure vessel steel with high strength and good toughness. It is mainly used in the manufacture of pressure vessels and boilers, meeting strict safety and performance requirements in industrial applications.
Chemical Composition and Mechanical Property
| Grade | C% | SI% | Mn% | P% | S% | N% | B% | Cr% | Mo% | Cu% | Nb% | Ni% | Ti% | V% | Zr% |
| P460Q | 0.18 | 0.5 | 1.7 | 0.025 | 0.015 | 0. 015 | 0.005 | 0.5 | 0.5 | 0.3 | 0.05 | 1 | 0.03 | 0.08 |
0.05 |
| Steel Grade | Yield Strength, for product in mm, Mpa | Tensile Strength, Mpa | Elongation, %, min | ||||
| P460Q | t≤50 | 50<t≤100 | 100<t≤150 | t≤100 | 100<t≤150 | 19 | |
| 460 | 440 | 400 | 550-720 | 500-670 | |||
typical dimensions
Thickness range– 6 mm to 150 mm– Thickness tolerances comply with EN 10029 Class A or Class B.
Width range– 1500 mm to 3000 mm– Some mills can provide widths up to 3500 mm by special order.
Length range– 6000 mm to 12000 mm– Custom lengths are available according to customer requirements.
Typical dimensions for plates– 10 × 2000 × 8000 mm– 20 × 2500 × 10000 mm– 40 × 3000 × 12000 mm– 80 × 3000 × 12000 mm
Process Characteristics of P460Q Steel
Precise Heat Treatment Control: The quenching and tempering process is accurately regulated with strict temperature and holding time control. This ensures uniform microstructure transformation, stable mechanical properties, and reliable low-temperature toughness without obvious performance fluctuation.
High Compatibility of Microalloying: The microalloying process adopts trace element matching, which enhances strength while maintaining good weldability and ductility. It avoids brittleness caused by excessive alloying and balances multiple performance indicators.
Efficient and Stable Forming Process: The hot rolling and cold forming processes are highly adaptable. They can be adjusted according to different product specifications, with high forming accuracy and low defect rate, suitable for mass production of various components.
Rigorous Quality-Oriented Control: Full-process quality monitoring is implemented from smelting to finishing. Strict process parameters and defect detection ensure consistent product quality, meeting the high requirements of heavy-duty engineering applications.
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.
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How to test the mechanical properties of P460Q?
The mechanical properties of P460Q are tested through tensile tests, impact tests and hardness tests. Tensile tests measure yield and tensile strength; impact tests evaluate toughness; hardness tests reflect wear resistance and strength.
Is P460Q a low-alloy steel?
Yes, P460Q is a low-alloy high-strength steel. It contains a small amount of alloying elements (less than 5%) to improve its strength and toughness compared with ordinary carbon steel, while maintaining good processability.
What is the maximum thickness of P460Q plates?
The maximum thickness of P460Q plates can reach more than 100 mm, depending on the manufacturer's production capacity and customer requirements. Thicker plates may need special heat treatment to ensure uniform properties.
Can P460Q be used in high-pressure water vapor environments?
Yes, P460Q is suitable for high-pressure water vapor environments, such as in boiler drums and steam pipes. Its high strength and corrosion resistance can withstand the erosion of high-pressure water vapor for a long time.
What is the difference between P460Q and P420Q?
The main difference is yield strength: P460Q has a minimum yield strength of 460 MPa, while P420Q is 420 MPa. P460Q also has better tensile strength and toughness, suitable for higher-pressure applications.
Does P460Q need surface treatment?
P460Q may need surface treatment such as sandblasting or pickling to remove oxide scales and rust before use. This improves the adhesion of coatings and prevents corrosion, extending the service life of the equipment.
What is the density of P460Q?
The density of P460Q is about 7.85 g/cm³, the same as ordinary carbon steel and most low-alloy steels. This density value is widely used in weight calculation and structural design of equipment.
Can P460Q be machined easily?
P460Q has good machinability under proper conditions. Using suitable cutting tools and parameters, it can be turned, milled, drilled and other machining operations. Its hardness and strength are moderate for machining.
What is the fatigue resistance of P460Q?
P460Q has good fatigue resistance, which is important for equipment subjected to cyclic loads. Proper heat treatment and surface finishing can further improve its fatigue life, ensuring long-term stable operation.
Is P460Q resistant to corrosion?
P460Q has basic corrosion resistance in ordinary environments, but not in harsh corrosive media like strong acids and alkalis. In such environments, corrosion-resistant coatings or alloy steels should be used.