16Mo3 is a European molybdenum-alloyed steel (EN 10028-2) with added Molybdenum for better high-temperature strength and corrosion resistance, while A516 Grade 70 is an American carbon-manganese steel (ASTM A516) for general pressure vessels, offering good strength but less inherent heat resistance than 16Mo3. The key difference is 16Mo3's molybdenum content, making it superior for elevated temperatures, whereas A516 Gr 70 is a robust, general-purpose choice for moderate conditions, often used in boilers and pressure vessels.
Chemical Composition
|
16Mo3 Chemical Composition |
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|
Grade |
The Element Max (%) |
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|
C |
Si |
Mn |
P |
S |
Al(min) |
N |
|
|
16Mo3 |
0.12-0.20 |
0.35 |
0.40-0.90 |
0.025 |
0.015 |
|
0.012 |
|
Cr |
Cu |
Mo |
Nb |
Ni |
Ti |
V |
|
|
0.30 |
0.30 |
0.25-0.35 |
|
0.30 |
|
|
|
|
A516 Grade 70 Chemical Composition |
Percentage % |
Composition |
Percentage % |
|
C |
0.10/ 0.22 |
Cu |
0.3 |
|
Si |
0.6 |
Ni |
0.3 |
|
Mn |
1/ 1.7 |
Mo |
0.08 |
|
P |
0.03 |
Nb |
0.01 |
|
S |
0.03 |
Ti |
0.03 |
|
Al |
0.02 |
V |
0.02 |
|
Cr |
0.3 |
|
|
Mechanical Property
|
Grade |
|
16Mo3 Mechanical Property |
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|
Thickness |
Yield |
Tensilmie |
Elongation |
Impact Energy(KV J) min |
|||
|
16Mo3 |
mm |
Min Mpa |
Mpa |
Min % |
-20° |
0° |
+20° |
|
≤ 16 |
275 |
440-590 |
22 |
f |
f |
31 |
|
|
16> to ≤40 |
270 |
440-590 |
22 |
f |
f |
31 |
|
|
40> to ≤60 |
260 |
440-590 |
22 |
f |
f |
31 |
|
|
60> to ≤100 |
240 |
430-580 |
22 |
f |
f |
31 |
|
|
100> to ≤150 |
220 |
420-570 |
22 |
f |
f |
31 |
|
|
150> to ≤250 |
210 |
410-570 |
22 |
f |
f |
31 |
|
|
Property |
ASTM A516 GR 70 |
|
|---|---|---|
|
Tensile Strength |
485–620 MPa (70–90 ksi) |
|
|
Yield Strength (min) |
260 MPa (38 ksi) |
|
|
Elongation (min, 200 mm) |
17% |
|
|
Elongation (min, 50 mm) |
21% |
|
|
Hardness (HB, typical) |
140–200 HB |
|
|
Impact Toughness (Charpy V-notch) |
Meets ASTM requirements at -46°C |
Key Differences
Alloy Content: 16Mo3 contains Molybdenum (0.25-0.35%), which improves high-temperature performance and corrosion resistance, whereas A516 Gr 70 is primarily carbon-manganese with no specified Mo content.
Standards: 16Mo3 follows European EN 10028-2 standards, while A516 Gr 70 follows American ASTM A516 standards.
Application Temperature: 16Mo3 is better suited for higher temperatures (up to 600°C) due to its molybdenum content, while A516 Gr 70 is for low to moderate temperature service.
Mechanical Properties: A516 Gr 70 offers good strength (Tensile: 485-620 MPa) and toughness, but 16Mo3's alloy provides superior heat resistance.
When to Use Which
Choose 16Mo3 for applications requiring better heat resistance, such as in high-temperature boilers or vessels exposed to corrosive environments.
Choose A516 Grade 70 for general pressure vessel applications where moderate temperatures and good strength/toughness are required, common in oil, gas, and petrochemical industries.
