ASTM A192 is designed for high-pressure service in boilers, while ASTM A106 is a more general-purpose carbon steel pipe for high-temperature, high-pressure applications. The key difference is that ASTM A192 is specifically for high-pressure boiler tubes, emphasizing strength and reliability in extreme steam conditions, whereas A106 is a versatile material used in industries like oil and gas, with applications like pipelines and pressure vessels.
Chemical Composition Comparison Table
| Chemical Composition (%) |
A192 Seamless Steel Pipe |
A106 Grade B Seamless Steel Pipe |
| Carbon (C) |
0.06-0.18 (with strict control for high-temperature performance) |
≤0.30 (typically lower in practice for Grade B, but max allowed is 0.30) |
| Manganese (Mn) |
0.27-0.63 |
0.29-1.06 |
| Phosphorus (P) |
≤0.035 |
≤0.025 |
| Sulfur (S) |
≤0.025 (stricter control for cleanliness and high-temperature resistance) |
≤0.025 |
| Silicon (Si) |
Not specified (but typically low) |
0.10 min (often 0.10-0.35) |
Mechanical Properties Comparison Table
| Mechanical Properties |
A192 Seamless Steel Pipe |
A106 Grade B Seamless Steel Pipe |
| Tensile Strength (MPa) |
≥325 (minimum, often higher due to strict composition control) |
≥415 (Grade B minimum, frequently exceeds this in practice) |
| Yield Strength (MPa) |
≥180 (but typically higher due to manufacturing standards) |
≥240 (Grade B minimum, often higher) |
| Elongation (%) |
≥30-35 (depending on pipe size and heat treatment) |
≥30 (for longitudinal strip specimens under standard test conditions) |
| Hardness (HB, typical) |
Low, due to low carbon and strict composition control |
Medium, due to higher carbon and silicon content |
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