What is the available thickness of P500Q plates？

What is the available thickness of P500Q plates?

P500Q plates (EN 10028-6) are available in a wide range of thicknesses, typically from 6 mm up to 300 mm (or even 400 mm), depending on the supplier, with common ranges often cited as 6mm to 300mm, designed for pressure vessel and boiler applications requiring quenched and tempered (Q&T) properties for high strength and toughness.

P500Q is a high-performance material that requires sophisticated workshop controls. Because its strength is "built-in" via heat treatment at the mill, the welding and forming processes must be meticulously managed to avoid destroying the tempered properties of the steel. It is a "workhorse" for shops certified to handle high-strength alloy welding.

Key Characteristics

Controlled Heat Input: Welders must strictly monitor the cooling time  to prevent softening the Heat Affected Zone 

Preheat Sensitivity: Usually requires preheating (100°C–150°C) to facilitate hydrogen diffusion and prevent cold cracking.

Surface Preparation: Typically supplied shot-blasted and primed to ensure a clean surface for high-quality welds.

Machinability: Despite its hardness, it can be cut and drilled with high-speed carbide tooling.

Decoding the Name

P: Tells the shop it requires Full Traceability (Heat numbers and MTCs).

500: Dictates the choice of Filler Metal (must match or exceed 500 MPa yield).

Q: Warns the shop that Hot Forming above the tempering temperature is prohibited without re-heat treatment.

Comparison

Vs. P355GH: P355GH is a "Normalised" steel; P500Q is "Quenched and Tempered." P500Q is nearly 45% stronger but requires much more stringent welding procedures.

Vs. ASTM A514: While A514 is a structural Q+T steel, P500Q is specifically refined for pressure-bearing applications with tighter chemical tolerances.

Common Application

Pressure Manifolds: Complex welded headers for oil and gas distribution.

Steam Drums: The core component of high-pressure industrial boilers.

High-Pressure Autoclaves: Used in aerospace and composite manufacturing.

Thickness: 6MM to 300MM,

Width: 1500mm to 4050mm,

Length: 3000mm to 15000mm

What temperature is P500Q?

P500Q refers to a grade of steel (EN 1.8873) designed for high-temperature pressure vessels, where the 'Q' signifies a quality level for low-temperature toughness, specifically tested to withstand impacts at -20°C (with QL1 for -40°C, QL2 for -60°C) while maintaining mechanical strength, with melting points for the material itself around 1460°C.

What is the hardness of P500Q?

P500Q (EN 1.8873) is a specialty nickel alloy steel, often supplied pre-hardened with a typical hardness range of 100-150 HB (Brinell), though values like 190 GPa (around 1400 MPa) are listed for Modulus of Elasticity, not hardness. For specific applications like mold steels, it can offer hardness in the range of 54-58 HRC (Rockwell C) after heat treatment, making it suitable for durable tooling.

What is the maximum thickness typically available for P500Q?

For P500Q (a high-strength, weldable structural steel for offshore/pressure vessels), maximum thicknesses often reach 150 mm, but can exceed this to 600 mm or more, depending on the supplier and specific agreements, with common ranges being up to 100-160mm for standard supply, requiring special orders for very thick plates.

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

1How does P500Q compare to P355QL1?

P500Q offers about 40% higher yield strength than P355QL1. This allows for significantly thinner wall designs in pressure vessels, which reduces total weight and welding time. However, P355QL1 is specifically designed for much lower temperatures (-40°C), whereas standard P500Q is only certified down to -20°C.

2Is P500Q considered a weldable material?

Yes, P500Q (EN 10028-6 P500Q) is specifically a weldable fine-grain steel designed for pressure equipment and high-temperature applications, known for its good weldability due to its quenched and tempered (Q&T) condition, making it suitable for critical welded structures.

3What does 500 mean In P500Q steel ?

In P500Q steel (EN 10028-6), the "500" signifies a minimum yield strength of 500 Megapascals (MPa), a key mechanical property indicating its load-bearing capacity, while the "Q" denotes quenching and tempering (Q&T), a heat treatment process for enhanced strength, and also implies Charpy impact testing at -20°C with 27 Joules of energy. This grade is a weldable, fine-grain steel used for high-temperature applications like pressure vessels.

4What are the primary welding risks for P500Q?

Welding P500Q (likely a type of steel) carries core risks like electric shock, intense UV/IR radiation burns (arc eye/skin), fires/explosions from sparks/hot slag, and respiratory hazards from metal fumes/gases (manganese, chromium, etc.), impacting eyes, skin, lungs, and nerves, requiring strict PPE (helmets, gloves, ventilation) for safety, as common to most arc welding but intensified by specific material fumes.

5What is the typical delivery condition for P500Q?

For P500Q steel, the typical delivery condition is +QT (Quenched and Tempered), as it's a high-strength, weldable fine-grain steel for pressure vessels and boilers, meaning it undergoes water quenching and tempering to achieve its excellent mechanical properties, though as-rolled delivery with simulated testing is also possible, notes ASM International and JOIN-WIN STEEL.

6What is the density of P500Q?

The density of P500Q steel (EN 1.8873), a nickel alloy steel, is approximately 7.9 g/cm³ (grams per cubic centimeter), which converts to about 7900 kg/m³ or 490 lb/ft³, consistent with most steels due to its primary iron content, with the nickel alloying element slightly influencing the value.

7What are the typical applications for P500Q?

P500Q typically refers to a high-strength, weldable, fine-grain steel plate (EN 10028-6 P500Q) used for manufacturing pressure vessels, boilers, and critical components in the petroleum, chemical, and power industries, requiring excellent toughness and strength, especially at low temperatures, for applications like gas storage facilities and reactor vessels. It's heat-treated (Quenched & Tempered) for these demanding conditions, providing superior performance over standard steels.

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