A515 Grade 65 is for intermediate-to-high temperature pressure vessels, focusing on strength at heat, while A516 Grade 65 is for moderate-to-low temperature service, prioritizing superior notch toughness (impact resistance) at colder temperatures, though both share similar strength levels (min yield ~240 MPa, tensile ~450-585 MPa). The key distinction is application: A515 for heat, A516 for cold/impact.
Chemical Composition of ASTM A515 Grade 65
|
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 |
Chemical Composition of ASTM A516 Grade 65
|
C |
Mn 1) |
P 2) |
S 2) |
Si |
|---|---|---|---|---|
|
0.24 |
0.85 - 1.20 |
0.020 |
0.010 |
0.15 - 0.40 |
Mechanical Properties of ASTM A515 Grade 65
|
Thickness (mm) |
Yield Strength (Min Mpa) |
Tensile Strength (Mpa) |
Elongation (Min %) |
|---|---|---|---|
|
≤ 200 |
240 |
450-585 |
19 |
|
≤ 50 |
240 |
450-585 |
23 |
Mechanical Properties of ASTM A516 Grade 65
|
Grade |
Yield strength |
Tensile strength |
Elongation in 2" 1) |
Elongation in 8" 1) |
|---|---|---|---|---|
|
65 |
35 |
65 - 85 |
23 |
19 |
ASTM A515 Grade 65
Primary Use: Intermediate to higher temperature pressure vessels.
Key Feature: Higher carbon content (around 0.28-0.33%) gives it better high-temp strength.
Performance: Stronger and more durable at elevated temperatures.
ASTM A516 Grade 65
Primary Use: Moderate to lower temperature pressure vessels, with emphasis on toughness.
Key Feature: Optimized for better notch toughness (impact strength) in colder conditions.
Performance: Excellent weldability and performance in sub-zero to moderate temperatures.
Key Similarities (Grade 65 Specific)
Yield Strength: Minimum 240 MPa (35 ksi).
Tensile Strength: 450-585 MPa (65-85 ksi).
Application: Both used in welded boilers & pressure vessels.
In Simple Terms:
Choose A515 Gr. 65 if your vessel runs hot; choose A516 Gr. 65 if it runs cold and needs to resist shattering from impacts.
