Research Article
Corrosion Study of Steel API 5A, 5L and AISI 1080, 1020 in Drill-Mud Environment of Iranian Hydrocarbon Fields
Table 2
Chemical composition of drill pipe and casing.
| | Steel | C | Mn | Si | P | S | Cr | Mo | Nb | V | Ti | Al | B | Fe |
| | API 5L-X46 | 0.3 max | 1.3 max | — | 0.04 max | 0.05 max | — | — | — | — | — | — | — | balance | | API 5L-X60 | 0.26 max | 1.35 max | — | 0.04 max | 0.05 max | — | — | 0.05 min | 0.02 min | 0.03 min | — | — | balance | | API 5L, Grade X52 | 0.21 max | 0.9 | 0.26 | 0.015 max | 0.05 max | — | — | — | 0.09 | — | 0.03 | — | balance | | API 5A, Grade K55 | 0.45 max | 1.3 | 0.26 | 0.015 max | 0.015 max | — | — | — | — | — | | — | balance | | API 5AX, Grade N-80 | 0.28 max | 1.48 | 0.26 | 0.015 max | 0.015 max | 0.2 | 0.1 | — | — | — | 0.007 | — | balance | | API 5AX, Grade P-110 | 0.28 max | 1.48 | 0.26 | 0.015 max | 0.015 max | 0.22 | 0.23 | — | — | — | 0.007 | — | balance | | API 5 AC, Grade C-90 | 0.29 max | 0.5 | 0.26 | 0.015 max | 0.015 max | 1.08 | 0.33 | — | 0.03 | — | — | 10−3 | balance | | API 5L, Grade A | 0.17 max | 0.5 | — | 0.02 | 0.02 | — | — | — | — | — | — | — | balance | | API 5L, Grade X60 | 0.05 max | 1.11 | 0.01 | 0.007 | 0.006 | — | — | 0.045 | — | — | 0.045 | — | balance |
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