What is the Yield strength of P500Q?
The yield strength (ReH) for P500Q steel is typically 500 MPa for thicknesses up to 50mm, but decreases to around 440 MPa for thicker sections (100-150mm), as it's a quenched and tempered (QT) structural steel where strength varies with thickness, offering a minimum of 500 MPa for standard sizes.
P500Q is a safety-critical material used in environments where failure could be catastrophic. Consequently, it is one of the most heavily tested grades in the pressure vessel industry. Every plate is typically subjected to ultrasonic testing and rigorous mechanical verification to ensure there are no internal defects that could lead to a burst under pressure.
Key Characteristics
Ultrasonic Integrity: Typically tested to EN 10160 Class S1E1 or better to ensure no internal laminations.
Z-Direction Quality: Often available with Z-testing (Z15, Z25, Z35) to resist lamellar tearing in complex joints.
Documentation: Always accompanied by an EN 10204 3.1 or 3.2 certificate for full traceability.
Fracture Toughness: Specifically tested via Charpy V-notch to ensure it won't shatter under sudden impact or pressure surges.
Decoding the Name
P: Mandatory for Statutory Inspection requirements.
500: The benchmark for Safety Factor calculations.
Q: Confirms the material has undergone Secondary Refining and heat treatment.
Comparison
Vs. P355QL1: P355QL1 provides better safety in arctic temperatures (-40°C), while P500Q provides a higher safety margin against over-pressurization at standard temperatures.
Vs. P500NH: P500NH is normalized; P500Q is Q+T. P500Q generally offers better impact toughness and higher yield-to-tensile ratios.
Common Application
Nuclear Secondary Containment: Critical piping and vessels in power plants.
Gas Storage Spheres: Often located near populated areas, requiring the highest safety grades.
Subsea Separators: Pressure units located on the seafloor where repair is impossible.
Thickness: 6MM to 300MM,
Width: 1500mm to 4050mm,
Length: 3000mm to 15000mm
What is the fundamental definition of P500Q steel?
P500Q steel is a European standard (EN 10028-6) weldable, fine-grain structural steel designed for high-temperature applications, known for its Quenching & Tempering (Q) heat treatment, providing good strength and toughness, with "P" for pressure vessel/plate and "500" indicating a minimum yield strength of 500 MPa. Its designation signifies excellent formability and weldability for critical components like boilers and pressure vessels, offering enhanced mechanical properties.
What 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.
What 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.
|
Grade/ Material |
Element |
Composition( Max-A, Min-I) |
|
DIN EN 10028-6 P500Q |
C |
A:0.18 |
|
Mn |
A:1.70 |
|
|
Si |
A:0.60 |
|
|
P |
A:0.025 |
|
|
S |
A:0.015 |
Mechanical Properties( Mpa)
|
Grade/ Material |
Tensile Test |
MPa |
|
DIN EN 10028-6 P500Q |
Tensile Strength |
590-770 |
|
Yield Strength |
I:500 |
|
|
Elongation |
I:17% |
|
|
Impact Test( if any) |
-20℃ |
1What Is The Difference Between P500Q And P500QL1 steel ?
The main difference between P500Q and P500QL1 steel lies in their impact toughness requirements, specifically the test temperature for Charpy V-notch impact tests, with the 'L1' designation indicating a lower, more demanding test temperature for improved brittle fracture resistance, crucial for cold-weather applications, while 'Q' signifies quenched and tempered, and 'L' (in QL) also points to low-temp toughness. Both are high-strength, weldable steels, but P500QL1 offers superior performance in extremely cold conditions compared to P500Q.
2Is preheating required when welding P500Q?
Yes, preheating is generally required when welding P500Q (a type of high-strength/abrasion-resistant steel), as it's crucial for preventing hydrogen-induced cracking, reducing thermal stress, and achieving proper metallurgical structure, though specific temperatures depend on thickness, code, and welding procedure. P500Q's chemistry and thickness demand slower cooling rates, which preheating provides, preventing brittleness in the Heat Affected Zone (HAZ).
3What role does Nickel (Ni) play in this grade?
In P500Q grade steel (EN 1.8873), Nickel (Ni) acts as a primary alloying element, significantly enhancing mechanical strength, toughness, creep resistance, and corrosion resistance, stabilizing the austenitic structure for high-temperature use, and improving hardenability, making it ideal for demanding applications needing a balance of durability and corrosion protection.
4Does P500Q require Post-Weld Heat Treatment (PWHT)?
P500Q (a type of low-alloy steel) generally does require PWHT, especially for thicker sections or in critical applications, to relieve stresses, prevent hydrogen cracking, and meet code requirements (like ASME for pressure vessels/piping when over certain thickness, e.g., 19mm/3/4" for B31.3), though exemptions might exist for very thin walls or specific conditions where high temperatures aren't a concern, making it material-specific and code-driven.
5What 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.
6What is the American (ASTM/ASME) equivalent to P500Q?
P500Q (EN 1.8873) is a European standard for a pressure vessel quality (PVQ) steel, often a Chromium-Molybdenum alloy, and while there isn't a single exact ASTM equivalent, ASTM A516 Grade 70 (for general PVQ) or perhaps a specialized ASTM A387 Grade 11 or 22 (for Cr-Mo applications) would be close matches for similar strength and application, but you must verify specific chemical composition and mechanical properties for final material selection.
7What is the price of P500Q steel ?
The price of P500Q steel varies significantly by supplier, quantity, and specifications, but generally falls in the range of $800 to $1600 per ton (USD) for pressure vessel plates, with some listings showing even broader ranges like $700-$1200/ton, while general steel plate prices might be lower. Expect prices to fluctuate with market conditions, so direct quotes from suppliers are essential for current rates.
If you want to learn more about P500QGNEE's products, you can send an email toinfo@gneesteels.com . We are more than happy to assist you.
