What is PVQ steel plate could also say - What is pressure vessel quality steel?
So, what is PVQ steel plate exactly? PVQ is an acronym for Pressure Vessel Plate Quality. That means any steel plate using this designation is designed for use in pressure vessels. These pressure vessels are normally some type of closed container meant to hold any gas or liquid that is held at a pressure much different than its surrounding ambient pressure.
- PVQ = Pressure Vessel Quality: Mandates full mechanical certification, ultrasonic inspection traceability, heat batch marking and compliant Mill Test Certificate (MTC) per A20/A20M general requirements.
- Dual standard alignment: ASTM A612 (material specification) + ASME SA612 (BPVC Section VIII pressure vessel code accepted material).
- Production restriction: Standard maximum supplied thickness = 25 mm (1 in); coil-derived plates must undergo full post-processing (decoiling, leveling, cutting, testing) to qualify as A612 PVQ stock.
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Not sure which PVQ grade fits your vessel design specification? Send us your working pressure, operating temperature, required plate thickness and project drawing. Our metallurgical engineers will offer free grade selection guidance and factory-direct pricing within 12 working hours.
| Grade Category | Standard Steel Grades | Core Application Scenario |
|---|---|---|
| Carbon PVQ Plate | A516 Gr55/60/70, P265GH, Q245R, SA612 | General oil & gas storage tanks, steam boilers, normal pressure reactors |
| Low Temperature PVQ Plate | A516 Gr70 LT, P355NL1/P355NL2, 16MnDR | LPG tanks, cryogenic pressure vessels, low-temperature pipeline vessels |
| High Strength PVQ Plate | P355GH, A106 GrB Plate, Q345R | High-pressure heat exchangers, industrial reaction kettles, heavy-duty storage containers |
| Alloy PVQ Plate | 13CrMo44, 15CrMoR | High-temperature boiler drums, thermal power pressure equipment, high temp chemical reactors |
ASTM A612 is killed C-Mn-Si PVQ plate ≤25mm thick, high-strength for low/moderate temp welded vessels, featuring fine grain, great weldability and low-temperature notch toughness.
Full Name: Standard Specification for Pressure Vessel Plates, Carbon Steel, High Strength, for Moderate and Lower Temperature Service ASTM International.
Designation: ASTM A612 (inch-pound units) / ASME SA612M (metric units) ASTM International.
Current Version: ASTM A612/A612M-20 (approved May 1, 2020).
Scope: Covers killed carbon-manganese-silicon steel plates for welded pressure vessels in moderate and lower temperature service ASTM International.
Benefits of Using A612 PVQ Plate
The advantages of using the PVQ grades not just in pressure vessels. But also in any other design requiring higher strengths. Better "toughness" (as defined by Charpy V-Notch testing), and better grain structure resulting in superior Ultra Sound Testing results. These applications include turbine manufacturing, compressors, heat exchangers, and virtually hundreds of other applications.
Pressure vessel steel plate covers carbon steel and alloy steel grades, which are designed for use in making pressure vessels, boilers, heat exchangers and any other vessels and tanks that to store liquid or gas at high pressures. It includes applications like below or similar:
- Petrochemical sector: Fabrication of reactors, heat exchangers, separators, spherical tanks, oil & gas storage tanks, liquefied gas tanks.
- Power generation sector: Utility boiler steam drums, nuclear reactor pressure vessels.
- Cryogenic storage & transportation: LNG storage tanks, LPG storage tanks and other cryogenic liquid containment equipment.
- Hydraulic engineering: High-pressure penstocks for hydropower stations, turbine spiral casings and related structural components.
What is A612 PVQ steel plate made of?
PVQ stands for Pressure Vessel Quality, a specific grade of carbon and alloy steel plate designed for boilers, pressure vessels, heat exchangers, and pressure-bearing industrial equipment.ASTM A612 / SA-612 is the standard specification for PVQ steel plate.
Note A: For each reduction of o01 percentage point below the specified carbon maximum. an increase of o .06 percentage point manganese
above the specified maximum is permitted up to a maximum of 1.65 % for heat analysis (1.70 % for product analysis).
Note B: Applies to both heat and product analyses.
Note C: When analysis shows that the amount of an element is 0.02 % or lower, the value may be reported as #0.02 %.
A612 Delivery Heat Treatment Conditions
A612 PVQ plate supports three delivery states selected by engineering specification:
- As-rolled (default): No post-heat treatment, cost baseline for non-cyclic low-pressure equipment.
- Normalized: Heating to 890–930°C, air cooling; refines grain structure, elevates -40°C impact toughness for cryogenic LPG vessels.
- Stress-relieved (SR): 600–650°C soak + slow cooling; eliminates rolling residual stress for post-weld heat treatment (PWHT) sensitive projects.
- Combined normalized + stress-relieved: Specified for HIC-resistant sour service PVQ applications.
Mandatory PVQ Quality Tests
All A612 PVQ steel plate must complete the below audit before shipment (non-PVQ stock exempts several items):
- Batch tensile & Charpy impact testing per heat number.
- Ultrasonic Testing (UT): Class I/II/III per contract, full volume scan for internal laminations.
- Surface & edge visual inspection, grinding repair documented per SA20M.
- Permanent marking on every plate: Heat ID, thickness, grade, standard, manufacturer logo.
- Full MTC 3.1 / 3.2 certification including traceable chemical, mechanical, UT records.
- Optional supplementary PVQ tests: S17 vacuum degassing, NACE TM0284 HIC test, simulated PWHT tensile retest.
Limitations of A612 PVQ Plate
Thickness cap of 25 mm under ASTM base standard; heavy-wall vessels (>25 mm) specify A516 Gr70 instead.
Not suitable for sustained temperatures above 350°C due to accelerated yield strength degradation.
No inherent corrosion resistance; internal coating or alloy cladding required for H₂S sour media environments.
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Global Reputation: We are a trusted supplier to processors serving the world's leading energy companies.
Technical Expertise: Our technical team possesses in-depth knowledge of materials science and international pressure vessel codes.
Quality Certification: We hold relevant certifications and employ full-time certified welding inspectors to oversee production processes, ensuring every steel plate meets strict standards.
Specialized Inventory: We maintain one of the world's largest inventories of hydrogen-crack-resistant steel plates, available for immediate deployment to your projects.
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FAQ:
What are the mechanical properties of ASTM A612 carbon steel plate?
ASTM A612 carbon steel plate typically offers a yield strength of at least 345 MPa, tensile strength of 570–725 MPa, and elongation of no less than 16%, ensuring strong and ductile performance.
Is ASTM A612 steel plate good for welding in pressure vessel fabrication?
Yes, ASTM A612 steel plate has low carbon content and controlled composition, providing excellent weldability, although preheating may be required for thicker plates.
What is the composition of ASTM A612?
ASTM A612 steel plate is a high-strength low-alloy (HSLA) steel plate designed for welded pressure vessels. It has a nominal composition of carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, and copper.
What is PVQ steel plate? Why is it so important?
Pressure Vessel Quality (PVQ) steel ensures exceptional impact toughness and strict quality control, which is typically required for ASME vessels and high-pressure systems.
