🟧 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