🟧 Product Overview

ASTM A533 is a high‑strength alloy steel used for pressure vessels and critical welded structures operating under high pressure and elevated temperatures. It is widely applied in nuclear power, petrochemical equipment, industrial boilers, and heavy‑duty pressure systems.

A533 is produced in Classes A, B, C, D, and E, each offering different combinations of strength, toughness, and alloy composition. Class B is the most commonly used grade for pressure vessel applications.

🟧 Standards

• ASTM A533 – Alloy Steel Plates for Pressure Vessels
• Related Standards: 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 A533 Class A
• ASTM A533 Class B
• ASTM A533 Class C
• ASTM A533 Class D
• ASTM A533 Class E

🟧 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 A533 Class B – typical)

Element	Max (%)
C	0.25
Mn	1.15–1.50
P	0.025
S	0.025
Si	0.15–0.40
Ni	0.40–1.00
Cr	0.15–0.30
Mo	0.45–0.60

🟧 Mechanical Properties (ASTM A533 Class B – typical)

Property	Value
Yield Strength	≥ 345 MPa
Tensile Strength	550–690 MPa
Elongation	≥ 18%
Impact Toughness	Excellent (heat‑treated alloy steel)

🟧 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
• Pickling
• Leveling
• Slitting / Cutting to length
• Surface oiling

🟧 Primary Industry Usage

• Nuclear pressure vessels
• High‑pressure boilers
• Petrochemical reactors
• Industrial pressure systems
• Heavy welded structures
• High‑temperature and high‑pressure components

🟧 Why Use ASTM A533 Pressure Vessel Steel Coil

• Alloy steel with superior strength and toughness
• Excellent performance under high pressure and elevated temperatures
• Suitable for critical and safety‑related pressure applications
• Multiple classes available for different performance requirements

🟧 Why Choose WelSteels

• Full range of 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