What is ASTM A516 Gr 55 vs Grade 70 ?
As a leading ASTM A516 steel plate exporter, Gneesteel specializes in supplying high-quality ASTM A516 Grade 55 and ASTM A516 Grade 70 steel plates for pressure vessels and boilers to industries worldwide. A516 Gr 55 steel plates and A516 Gr 70 steel plates.
For more details on our products, explore our ASTM A516 steel plate category or check specific grades like A516 Grade 55, A516 Grade 60, A516 Grade 65, and A516 Grade 70.
Chemical Composition: ASTM A516 Gr 55 vs Grade 70
The chemical composition of A516 Gr 55 and ASTM A516 Gr 70 influences their performance in pressure vessel applications. Below is a detailed comparison of their chemical properties.
|
Element |
A516 Gr 55 (Max %) |
A516 Gr 70 (Max %) |
|---|---|---|
|
Carbon (C) |
0.24 (<12.5mm), 0.26 (12.5-50mm), 0.28 (50-100mm), 0.29 (100-200mm), 0.29 (>200mm) |
0.27 (all thicknesses) |
|
Silicon (Si) |
0.13–0.45 |
0.15–0.40 |
|
Manganese (Mn) |
0.79–1.30 |
0.85–1.20 |
|
Phosphorus (P) |
0.035 |
0.035 |
|
Sulfur (S) |
0.035 |
0.035 |
|
Nickel (Ni) |
Optional (0.40 max) |
Optional (0.40 max) |
|
Chromium (Cr) |
Optional |
Optional (0.30 max) |
|
Molybdenum (Mo) |
Optional |
Optional (0.08 max) |
Key Differences:
Carbon Content: A516 Gr 55 has a slightly higher maximum carbon content for thicker plates (>50mm), while A516 Gr 70 maintains a consistent 0.27% max across all thicknesses.
Manganese Range: A516 Gr 55 has a broader manganese range (0.79–1.30%), while A516 Gr 70 has a narrower range (0.85–1.20%), contributing to its higher strength.
Carbon Equivalent (Ceq): Both grades use the formula Ceq = [C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15] to ensure weldability. A516 Gr 70's tighter composition enhances its strength without compromising weldability.
For more details, check our A516 Grade 55 and A516 Grade 70 product pages.
Mechanical Properties: ASTM A516 Gr 55 vs Grade 70
The mechanical properties of A516 Gr 55 and A516 Gr 70 determine their suitability for specific applications. Below is a comparison of their yield strength, tensile strength, and elongation.
|
Property |
A516 Gr 55 |
A516 Gr 70 |
|---|---|---|
|
Thickness |
6–50mm, 50–200mm |
6–40mm, 40–100mm |
|
Yield Strength (Min MPa) |
205 (6–50mm), 205 (50–200mm) |
260 (6–40mm), 260 (40–100mm) |
|
Tensile Strength (MPa) |
380–515 |
485–620 |
|
Elongation (Min %) |
27% (6–50mm), 23% (50–200mm) |
21% (6–40mm), 17% (40–100mm) |
Key Differences:
Yield Strength: A516 Gr 70 has a higher minimum yield strength (260 MPa) compared to A516 Gr 55 (205 MPa), making it suitable for higher-pressure applications.
Tensile Strength: A516 Gr 70 offers a higher tensile strength range (485–620 MPa) than A516 Gr 55 (380–515 MPa), providing greater durability in demanding environments.
Elongation: A516 Gr 55 has higher elongation (up to 27%) compared to A516 Gr 70 (up to 21%), indicating better ductility for forming processes.
Impact Toughness: Both grades support optional Charpy V-notch testing (e.g., -20°C or -46°C) as per customer specifications, ensuring low-temperature performance.
Explore our ASTM A516 steel plate category for more information on mechanical properties.
If you need ASTM A516 Grade 55 or Grade 70 steel plates for pressure vessels, boilers, or storage tanks, we can provide full specifications, original mill test certificates, and stable delivery to support your project.Whether you prefer lower cost and easier welding with Gr 55, or higher strength and pressure resistance with Gr 70, GNEE have the right solution for you.We guarantee competitive pricing, reliable quality, and professional service for every order.Please feel free to send us your required size, thickness, and quantity - GNEE are ready to offer you our best offer at any time.
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