A515 Gr 65 is a carbon steel plate specified under the ASTM A515 standard for pressure vessel plates, tailored for intermediate and higher-temperature service. These plates are normalized to enhance their mechanical properties, making them suitable for applications such as boilers, heat exchangers, and pressure vessels operating at elevated temperatures.
ASTM A515 GR 65 Chemical Composition (Product and Ladle Analysis)
|
Element |
Product Analysis Max (%) |
Ladle Analysis Max (%) |
|---|---|---|
|
Carbon (C) |
0.28-0.33 |
0.28-0.33 |
|
Manganese (Mn) |
0.98 |
0.90 |
|
Phosphorus (P) |
0.035 |
0.035 |
|
Sulfur (S) |
0.035 |
0.035 |
|
Silicon (Si) |
0.13-0.45 |
0.15-0.40 |
Carbon Equivalent (Ceq):
The carbon equivalent is calculated using the formula:
Ceq = [C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15]%.
This ensures the weldability and suitability of ASTM A515 Gr.65 for pressure vessel applications.
Mechanical Properties of ASTM A515 Grade 65
A515 Gr 65 offers a balanced combination of strength and ductility, making it a preferred choice for moderate to high-temperature applications. The following table outlines its key mechanical characteristics:
|
Thickness (mm) |
Yield Strength (Min Mpa) |
Tensile Strength (Mpa) |
Elongation (Min %) |
|---|---|---|---|
|
≤ 200 |
240 |
450-585 |
19 |
|
≤ 50 |
240 |
450-585 |
23 |
These properties ensure that ASTM A515GR.65 steel plates can withstand high-pressure conditions while maintaining structural integrity.
Applications of ASTM A515 Grade 65 Steel Plate
ASTM A515 Gr.65 is widely used in industries requiring robust materials for high-temperature and high-pressure environments. Common applications include:
Boilers and Pressure Vessels: Ideal for fabricating boilers and pressure vessels due to its strength and heat resistance.
Heat Exchangers: Used in heat exchangers for efficient heat transfer under elevated temperatures.
Power Generation: Employed in power plants for components exposed to high temperatures.
Petrochemical Industry: Suitable for storage tanks and processing equipment in petrochemical plants.
Comparison with Other ASTM A515 Grades
|
Property |
A515 Grade 60 |
A515 Grade 65 |
A515 Grade 70 |
|---|---|---|---|
|
Carbon Content (Max %) |
0.24-0.31 |
0.28-0.33 |
0.30-0.35 |
|
Manganese (Max %) |
0.98 |
0.98 |
1.30 |
|
Yield Strength (Min Mpa) |
220 |
240 |
260 |
|
Tensile Strength (Mpa) |
415-550 |
450-585 |
485-620 |
|
Elongation (Min %, 200mm) |
21 |
19 |
17 |
ASTM A515 Grade 60: Offers lower strength but higher ductility, suitable for less demanding applications.
ASTM A515 Grade 70: Provides higher strength, ideal for high-pressure and high-temperature environments.
ASTM A515 Gr.65: Strikes a balance between strength and ductility, perfect for moderate-temperature services.
Comparison with ASTM A516 Grades
For a broader perspective, we compare ASTM A515 Gr.65 with ASTM A516 grades, which are designed for moderate and lower-temperature services:
|
Property |
A515 Grade 65 |
A516 Grade 55 |
A516 Grade 60 |
A516 Grade 65 |
A516 Grade 70 |
|---|---|---|---|---|---|
|
Temperature Service |
Intermediate/High |
Moderate/Low |
Moderate/Low |
Moderate/Low |
Moderate/Low |
|
Carbon Content (Max %) |
0.28-0.33 |
0.18-0.26 |
0.21-0.27 |
0.24-0.29 |
0.27-0.31 |
|
Yield Strength (Min Mpa) |
240 |
205 |
220 |
240 |
260 |
|
Tensile Strength (Mpa) |
450-585 |
380-515 |
415-550 |
450-585 |
485-620 |
|
Elongation (Min %, 200mm) |
19 |
27 |
25 |
23 |
21 |
ASTM A516 Grade 55: Best for low-temperature applications with high ductility.
ASTM A516 Grade 60: Similar to A515 Grade 60 but optimized for lower temperatures.
ASTM A516 Grade 65: Matches A515 Gr 65 in strength but is designed for lower-temperature service.
ASTM A516 Grade 70: Offers higher strength, suitable for more demanding low-temperature applications.
For high-temperature applications, ASTM A515GR.65 outperforms A516 grades due to its normalized structure and enhanced heat resistance.
