🟧 Product Overview
ASTM A203 is a nickel‑alloy pressure vessel steel designed for low‑temperature service. The addition of nickel significantly improves impact toughness, ductility, and fracture resistance at sub‑zero temperatures, making A203 a preferred material for cryogenic and low‑temperature pressure vessels.
A203 includes Grades A, B, D, E, and F, with Grade E being the most widely used due to its excellent balance of strength and low‑temperature toughness.
🟧 Standards
ASTM A203 – Pressure Vessel Plates, Alloy Steel, Nickel
Related Standards: ASTM A516, ASTM A537, ASTM A387, 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 A203 Grade A
ASTM A203 Grade B
ASTM A203 Grade D
ASTM A203 Grade E
ASTM A203 Grade F
🟧 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 A203 Grade E – typical)
Element Max (%) C 0.20 Mn 0.90–1.50 P 0.025 S 0.025 Si 0.15–0.40 Ni 2.25–3.25
🟧 Mechanical Properties (ASTM A203 Grade E – typical)
Property Value Yield Strength ≥ 345 MPa Tensile Strength 550–690 MPa Elongation ≥ 18% Low‑Temperature Toughness Excellent (nickel alloy) Fracture 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
LNG storage tanks
Cryogenic pressure vessels
Low‑temperature industrial containers
Petrochemical equipment
Refrigeration and gas storage systems
High‑pressure welded structures
🟧 Why Use ASTM A203 Pressure Vessel Steel Coil
Nickel‑alloy steel for low‑temperature service
Excellent impact toughness at sub‑zero temperatures
High fracture resistance and ductility
Suitable for cryogenic and low‑temperature pressure applications
🟧 Why Choose WelSteels
Full range of nickel‑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
