🟧 Product Overview
ASTM A204 is a molybdenum‑alloy pressure vessel steel designed for elevated‑temperature service. Its Mo‑enhanced chemistry provides improved high‑temperature strength, creep resistance, and oxidation resistance compared with standard carbon steel pressure vessel grades.
A204 is available in Grades A, B, and C, with Grade B being the most widely used due to its balanced strength and toughness. It is commonly used in boilers, refinery heaters, petrochemical reactors, and high‑temperature welded pressure systems.
🟧 Standards
ASTM A204 – Pressure Vessel Plates, Alloy Steel, Molybdenum
Related Standards: ASTM A387, ASTM A516, ASTM A537, EN 10028, JIS G3103, GB Q345R/Q370R
🟧 International Pressure Vessel Steel Standards Comparison Table
Country Standard Common Grades China GB 713 / GB 19189 Q245R, Q345R, Q370R America ASTM A516 / A515 / A537 / A387 / A203 / A204 / A285 / A202 A516 Gr60/70, A515, A537, A387, A203, A204, A285, A202 Germany DIN 17155 HII, 19Mn6 Japan JIS G3103 P235GH, P265GH, P295GH, P355GH France NF A 36‑205 A42CP, A48CP Britain BS 1501 161‑430A/B International (EN) EN 10028 P235GH, P265GH, P355GH
🟧 Available Grades
ASTM A204 Grade A
ASTM A204 Grade B
ASTM A204 Grade C
🟧 Product Specifications & Available Sizes
Dimensions
Thickness: 3 – 20 mm
Width: 1000 – 2000 mm
Coil ID: 508 mm / 610 mm
Coil OD: 900 – 2000 mm
Coil Weight: 3 – 15 MT
Regular Sizes (mm)
Size Size 3.0 × 1500 × C 5.75 × 1800 × C 3.5 × 1500 × C 5.75 × 2000 × C 3.75 × 1500 × C 7.75 × 2000 × C 4.5 × 1500 × C 7.5–11.75 × 1500 × C
🟧 Chemical Composition (ASTM A204 Grade B – typical)
Element Max (%) C 0.20 Mn 0.90–1.50 P 0.025 S 0.025 Si 0.15–0.50 Mo 0.45–0.60
🟧 Mechanical Properties (ASTM A204 Grade B – typical)
Property Value Yield Strength ≥ 275 MPa Tensile Strength 450–585 MPa Elongation ≥ 18% High‑Temperature Strength Excellent Creep Resistance High
🟧 Physical Properties
Density: 7.85 g/cm³
Modulus of elasticity: 200 GPa
Thermal expansion: 12×10⁻⁶ /K
🟧 Manufacturing Processes
Hot rolling
Normalizing
Quenching & tempering (optional)
Pickling
Leveling
Slitting / Cutting to length
Surface oiling
🟧 Primary Industry Usage
Refinery heaters
Petrochemical reactors
High‑temperature pressure vessels
Industrial boilers
Heat exchangers
High‑pressure welded structures
🟧 Why Use ASTM A204 Pressure Vessel Steel Coil
Molybdenum‑alloy steel for elevated‑temperature service
Excellent creep resistance and oxidation resistance
Suitable for high‑temperature and high‑pressure environments
Available in three strength levels (A/B/C)
🟧 Why Choose WelSteels
Full range of alloy pressure vessel steel coils
Consistent dimensional accuracy
Custom coil cutting and slitting
SGS / BV inspection available
Export‑grade seaworthy packaging
Reliable delivery for global projects
