The yield strengths of J55 and K55 are in the same class, but the tensile strength of K55 is slightly higher than that of J55, which means that K55 is more suitable for use in higher tensile requirements, especially in harsher well conditions. In oil and gas extraction, depending on the depth and geological conditions of the well, choosing the right casing material is critical to ensuring safety and efficiency.
J55 Chemical composition (%)
| Composition | P | S |
|---|---|---|
| Min | - | - |
| Max | 0.03 | 0.03 |
J55 Mechanical properties
| Tensile Strength σb Mpa |
Yield Point σs Mpa |
Elongation at break or elongation δ % |
|---|---|---|
| ≥414 | 276~552 | ≥0.5 |
K55 Chemical composition (%)
| Composition | P | S |
|---|---|---|
| Min | - | - |
| Max | 0.03 | 0.03 |
K55 Mechanical properties
| Tensile Strength σb Mpa |
Yield Point σs Mpa |
Elongation at break or elongation δ % |
|---|---|---|
| ≥655 | 379~552 | ≥0.5 |
