Production Process

product-553-338

Chemical Composition

Element	Content
Carbon (C)	≤ 0.25%
Manganese (Mn)	Melting analysis: 1.15% - 1.50%, Product analysis: 10.7% - 1.62%
Phosphorus (P)	≤ 0.035%
Sulfur (S)	≤ 0.035%
Silicon (Si)	Melting analysis: 0.15% - 0.40%, Product analysis: 0.13% - 0.45%
Molybdenum (Mo)	Melting analysis: 0.45% - 0.60%, Product analysis: 0.41% - 0.64%

Mechanical Properties of A533 - Gr.A.I

Mechanical Property	Value
Tensile Strength	550–690 MPa
Yield Strength	≥345 MPa
Elongation	≥18% (in 50mm)
Impact Toughness (Charpy V-notch)	≥41J at -18°C (0°F)

Advantages

Advantage	Description
High Strength	Tensile strength (550–690 MPa) and yield strength (≥345 MPa) meet demands for heavy-load structures.
Excellent Toughness	Charpy V-notch impact ≥41J at -18°C, suitable for low-temperature environments (e.g., nuclear applications).
Radiation Resistance	Optimized composition (Ni, Mo) reduces neutron irradiation embrittlement in reactor pressure vessels.
Good Weldability	Preheating + post-weld heat treatment (PWHT) minimizes cracking risks. Compatible with common welding methods.
Thermal Stability	Retains mechanical properties under high-temperature service conditions.
Standard Compliance	Certified under ASTM A533/A533M and ASME SA533, ensuring reliability for nuclear/pressure vessels.

Applications

Industry	Applications
Pressure Vessel Industry	Oil refinery, chemical plant, and power plant pressure vessels
Boiler Industry	Power generation and industrial production boilers
Nuclear Industry	Reactor pressure vessels and piping systems
Heavy Machinery Industry	Large - scale presses and forging equipment
Offshore Oil and Gas Industry	Offshore platform construction

Packaging

Packaging Aspect	Details
Surface Protection	Coated with anti-rust agent or protective film
Stacking and Bundling	Stacked neatly and bundled with steel straps or wire ropes
Support	Placed on wooden pallets or skids
Additional Protection	May be covered with waterproof tarp or plastic film
Labeling	Marked with steel grade, size, thickness, batch number, etc.

product-422-340

FAQ

Q: What is A533 Gr.A Cl.I steel used for?

A: Primarily for nuclear reactor pressure vessels (RPVs), heavy-walled pressure containers, and critical power plant components due to its high strength and radiation resistance.

Q: What heat treatment is required?

A: Supplied in quenched and tempered (Q&T) condition for optimal strength and toughness.

Q: Can A533 - Gr.A.I be welded easily?

A: Yes, it has good weldability, but proper welding procedures and pre - heating may be required.

Q: What standard does A533 - Gr.A.I follow?

A: It follows ASME SA533/SA533M standards for pressure - vessel - quality alloy steel plates.

Q:What is your minimum order quantity?

A:Usually 10 tons, special circumstances can be negotiated.

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