Carbon Pressure Vessel Steel Plate is the primary material used for manufacturing boilers, pressure vessels, heat exchangers, and industrial pressure systems operating under moderate temperatures and pressures.
These steels are designed to provide:
Reliable strength under pressure cycling
Excellent weldability
Good impact toughness
Stable performance in medium‑temperature environments
Cost‑effective solutions for large‑scale equipment
This category includes the most widely used global grades such as A516, A515, A285, Q245R, Q345R, and P265GH.
🟪 2. Why Choose Carbon Pressure Vessel Steel?
Excellent weldability for fabrication
Good toughness for pressure applications
Suitable for moderate temperatures
Cost‑efficient for large vessels and boilers
Accepted by global standards (ASTM / ASME / EN / JIS / GB)
Available in normalized condition for enhanced performance
🟪 3. Product Categories
🟪 A. Medium‑Temperature Pressure Vessel Steel
(Used for boilers, storage tanks, heat exchangers, and general pressure vessels operating from ambient to medium temperatures.)
Included Grades
A516 (Gr 55 / 60 / 65 / 70)
A515 (Gr 60 / 65 / 70)
Q245R / Q345R
P235GH / P265GH / P295GH / P355GH
Key Notes
This is the most widely used category of pressure vessel steel worldwide.
A516 Grade 70 is the single most commonly used pressure vessel steel globally.
Designed for moderate temperatures (typically up to 400°C)
Excellent weldability and impact toughness
Suitable for petrochemical, power generation, and industrial boilers
🟪 B. Low‑Pressure Storage Tank Steel
(Used for atmospheric or low‑pressure storage tanks and non‑high‑temperature equipment.)
Included Grades
A285 (Grade A / B / C)
Key Notes
Used for low‑pressure storage tanks and non‑high‑temperature pressure systems
Offers lower cost and better formability
Suitable for welded storage tanks, low‑pressure vessels, and general industrial tanks
🟪 C. Normalized Carbon Pressure Vessel Steel
(Used when higher toughness, improved stability, and enhanced performance are required.)
Included Grades
A516N (Normalized A516)
Q345R (Normalized)
P355GH (Normalized)
Key Notes
Used for higher‑requirement boilers, pressure vessels, and heat exchangers
Better suited for low‑temperature impact requirements
Normalizing improves grain structure, toughness, and uniformity
Preferred for thicker plates and critical pressure components
🟪 4. Complete Grade List (ASTM / GB / EN / JIS)
ASTM / ASME
A516 (Gr 55 / 60 / 65 / 70)
A515 (Gr 60 / 65 / 70)
A285 (A / B / C)
GB / Chinese Standard
Q245R
Q345R
EN / JIS Equivalent
P235GH
P265GH
P295GH
P355GH
🟪 5. Mechanical Properties
Grade
Yield Strength
Tensile Strength
Elongation
Impact Toughness
A516 Gr 70
≥260 MPa
485–620 MPa
≥17%
27 J @ −20°C
A515 Gr 70
≥260 MPa
485–620 MPa
≥17%
Moderate toughness
A285 Gr C
≥205 MPa
380–515 MPa
≥17%
Standard toughness
Q345R
≥345 MPa
510–640 MPa
≥21%
27 J @ −20°C
P265GH
≥265 MPa
410–530 MPa
≥22%
27 J @ 20°C
🟪 6. Chemical Composition
Grade
C (%)
Mn (%)
Si (%)
P (%)
S (%)
Notes
A516 Gr 70
≤0.27
0.85–1.20
≤0.40
≤0.035
≤0.035
Most widely used PV steel
A515 Gr 70
≤0.31
0.60–1.00
≤0.40
≤0.035
≤0.035
Higher carbon, higher strength
A285 Gr C
≤0.28
0.60–1.50
≤0.30
≤0.035
≤0.035
Low‑pressure tank steel
Q345R
≤0.20
≤1.70
≤0.50
≤0.025
≤0.015
Chinese standard PV steel
P265GH
≤0.20
0.80–1.50
≤0.40
≤0.025
≤0.020
EN standard PV steel
🟪 7. Product Specifications
Thickness: 6 – 200 mm
Width: 1500 – 3000 mm
Length: Custom lengths available
Delivery Conditions:
Hot Rolled
Normalized
Stress‑Relieved
UT Testing (A / B / C / D) available
🟪 8. Applications
Industrial boilers
Pressure vessels
Heat exchangers
Storage tanks
Petrochemical equipment
Power plant components
Refinery pressure systems
🟪 9. Why Choose WelSteels
Full range of carbon pressure vessel steel grades
Stable mechanical properties and certified quality
