ASTM A192 is for high-pressure, high-temperature applications like boilers, while ASTM A179 is for moderate- to low-temperature, lower-pressure applications like condensers and heat exchangers. The key dfference is the application:A192 is engineered for higher stress environments, whereas A179 is designed for efficiency and lower-stress thermal performance.
chemical compositions of A179 and A192 seamless steel pipes:
| Chemical Composition (%) | A179 Seamless Steel Pipe | A192 Seamless Steel Pipe |
|---|---|---|
| Carbon (C) | 0.06-0.18 | 0.06-0.18 (may have slight differences, depending on the standard) |
| Manganese (Mn) | 0.27-0.63 | 0.27-0.63 (may have slight differences, depending on the standard) |
| Phosphorus (P) | ≤ 0.035 | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 | ≤ 0.025 (stricter requirement) |
mechanical properties of A179 and A192 seamless steel pipes:
| Mechanical Properties | A179 Seamless Steel Pipe | A192 Seamless Steel Pipe |
|---|---|---|
| Tensile Strength (MPa) | ≥325 (usually range in 325-425) | ≥325 (minimum requirement, often higher in practice) |
| Yield Strength (MPa) | ≥190 | ≥180 (slightly lower minimum requirement, but typically higher) |
| Elongation (%) | ≥35 (or ≥30 in some standards for specific sizes/conditions) | ≥30-35 (depending on specific standard and heat treatment) |
| Hardness (HB) | Not specified in ASTM A179, but typically low due to carbon content and heat treatment | Not specified, but generally similar to or slightly higher than A179 due to stricter composition control |
