ASTM A515 Grade 65 Pressure Vessel Steel Plate

ASTM A515 Grade 65 is a carbon steel plate designed for intermediate and high-temperature pressure vessel applications, suitable for service conditions ranging from 400°C to 650°C. Compliant with the ASTM A515 standard, it offers excellent oxidation resistance and creep strength, making it widely used in critical components such as: Heat exchanger tube sheet,Boiler shells for power plants.

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Product Description

1.What is the chemical composition of ASTM A515 Grade 65 steel plate used for heat exchanger tube sheets and petrochemical reactor shells?

A515 grade 65 Chemical Composition
Grade	The Element Max(%)
Grade	C	Mn	P	S	Si
A515 grade 65	0.28-0.33	0.98	0.035	0.035	0.13-0.45

2.What are the main differences between A515 Gr.65 and A516 Gr.60?

Property	A515 Grade 65	A516 Grade 60
Standard Application	Intermediate/high-temperature service (up to 650°C)	Low-temperature pressure vessels (down to -46°C)
Tensile Strength	450-585 MPa	415-550 MPa
Yield Strength	≥240 MPa	≥220 MPa
Key Composition	Higher Mn (0.90-1.50%) for elevated temp strength	Controlled low Mn (0.85-1.20%) for toughness
Impact Test Requirement	Not mandatory (unless specified)	Required (Charpy V-notch @ -46°C)
Typical Use Cases	Petrochemical reactors, boiler components	Cryogenic storage tanks, LNG equipment
Cost Factor	Higher (alloy-adjusted)	More economical

3.What are the advantages of A515 Grade 65 steel?

Outstanding High-Temperature Performance

Long-term service temperature up to 650°C, with significantly superior oxidation resistance and creep strength compared to standard carbon steels.
15-20% higher high-temperature strength retention than A516 Gr.60 (based on ASTM data).

High Cost-Effectiveness

40-60% lower material cost versus stainless steel (e.g., 304/316), ideal for large-scale storage tanks/boiler fabrication.
Easier processing than comparable high-temperature steels (e.g., Cr-Mo steels), reducing manufacturing man-hours.

Excellent Process Adaptability

Suitable for hot forming, welding (preheat to 150-200°C required), and heat treatment, fully compatible with standard pressure vessel manufacturing processes.
Available in normalized delivery condition to optimize microstructure.

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