Table 1 Nominal composition of representative carbon and low alloy steels as well as CRA for oilfield applications
From: Materials and corrosion trends in offshore and subsea oil and gas production
Alloy designation | Standard nominal composition (wt%) | SMYS | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|  | Cr | Mo | Ni | W | N | Fe | Nb or (Nb + Ta) | Ti (Al) | Cu | C | Si | Mn | MPa (ksi) |
Carbon and low alloy steels | |||||||||||||
 API 5L-X65Q (PSL 2) | – | – | – | – | – | bal. | § | § | – | 0.18 (max.) | 0.45 (max.) | 1.70 (max.) | 450 (65) |
 ASTM A694 F65 | – | – | – | – | – | bal. | – | – | – | 0.30 (max.) | 0.15–0.30 | 1.60 (max.) | 450 (65) |
 ASTM A508 Gr. 4 | 1.50 to 2.0 | 0.40 to 0.6 | 2.80–3.90 | – | – | bal. | – | – | – | 0.23 (max) | 0.40 (max) | 0.20 to 0.40 | 690 (100) |
 UNS K32047 | 1.50 to 1.90 | 0.50 to 0.65 | 3.00–3.50 | – | – | bal. | – | – | – | 0.14 to 0.20 | 0.15–0.38 | 0.10 to 0.14 | 690 (100) |
 10GN2MFA | 0.30 (max.) | 0.40 to 0.70 | 1.80–2.30 | – | – | bal. | – | – | – | 0.08 to 0.12 | 0.17–0.37 | 0.80 to 1.10 | 414 (60) |
 UNS K21590 | 2.00 to 2.50 | 0.90 to 1.10 | 0.25 (max) | – | – | bal. | – | – | – | 0.11 to 0.15 | 0.10 (max) | 0.30 to 0.60 | 517–586 (75–85) |
 UNS G43200 | 0.40 to 0.60 | 0.20 to 0.30 | 1.65–2.00 | – | – | bal. | – | – | – | 0.17 to 0.22 | 0.15 to 0.35 | 0.45 to 0.65 | 414 (60) |
Precipitation-hardened low alloy steels | |||||||||||||
 ASTM A707-L5 | 0.60 to 0.90 | 0.15 to 0.25 | 0.70 to 1.00 | – | – | bal. | – | – | 1.00 to 1.30 | 0.07 (max.) | 0.35 (max.) | 0.09 (max.) | 517 (75) |
Solution annealed nickel-based alloys | |||||||||||||
 UNS N06625 | 20.0 to 23. 0 | 8.0 to 10.0 | 58.0 (min.) | – | – | 5.0 (max.) | (3.15 to 4.15) | – | – | 0.10 (max.) | 0.50 (max.) | 0.50 (max.) | 290–414 (42–60)a |
Precipitation-hardened nickel-based alloys | |||||||||||||
 UNS N07718 | 17.0 to 21.0 | 2.80 to 3.30 | 50.0 to 55.0 | – | – | bal. | (4.87 to 5.20) | 0.80 to 1.15 | 0.23 (max.) | 0.045 (max.) | 0.010 (max.) | 0.35 (max.) | 827–965 (120–140) |
 UNS N07725 | 19.0 to 22.5 | 7.00 to 9.50 | 55.0 to 59.0 | – | – | bal. | 2.75 to 4.00 | 1.00 to 1.70 | – | 0.030 (max.) | 0.20 (max.) | 0.35 (max.) | 827 (120) |
 UNS N07716 | 19.0 to 22.0 | 7.00 to 9.50 | 59.0 to 63.0 | – | – | bal. | 2.75 to 4.00 | 1.00 to 1.60 | 0.23 (max.) | 0.030 (max.) | 0.20 (max.) | 0.20 (max.) | 827–965 (120–140) |
 UNS N06059 | 22.0 to 24.0 | 15.0 to 16.5 | bal. | – | – | 1.50 (max.) | – | (0.1 to 0.40) | – | – | 0.10 (max.) | 0.50 (max.) | 450 (65ksi)b |
 UNS N06680c | 20.5 | 6.5 | bal. | 6.5 | – | 0.1 (max.) | 3.5 | 1.5 | – | 0.010 (max.) | – | – | 550–665 (80–95) |
 UNS N06686 | 19.0 to 23.0 | 15.0 to 17.0 | bal. | 3.0 to 4.0 | – | 5.0 (max.) | – | – | – | 0.010 (max.) | 0.08 (max.) | 0.75 (max.) | 760 (110)d |
Duplex and super duplex stainless steels | |||||||||||||
 UNS S32205 | 21.0 to 23.0 | 2.50 to 3.50 | 4.50 to 6.50 | – | 0.08 to 0.20 | bal. | – | – | – | 0.03 (max.) | 0.2 to 0.70 | 2.0 (max.) | 450 (65) |
 UNS S32750 | 24.0 to 26.0 | 3.0 to 5.0 | 6.0 to 8.0 | – | 0.24 to 0.32 | bal. | – | – | – | 0.03 (max) | 0.8 (max.) | 1.2 (max.) | 550 (80) |
 UNS S32760 | 24.0 to 26.0 | 3.0 to 4.0 | 6.0 to 8.0 | 0.50 to 1.0 | 0.20 to 0.30 | bal. | – | – | 0.5 to 1.0 | 0.03 (max.) | 1.0 (max.) | 1.0 (max.) | 550 (80) |
 UNS S39274 | 24.0 to 26.0 | 2.50 to 3.50 | 6.0 to 8.0 | 1.5 to 2.5 | 0.24 to 0.32 | bal. | – | – | 0.20 to 0.80 | 0.03 (max.) | 0.8 (max.) | 1.0 (max.) | 550 (80) |
Austenitic and highly alloyed austenitic stainless steels | |||||||||||||
 UNS S31603 | 16.0 to 18.0 | 2.0 to 3.0 | 10.0 to 14.0 | – | – | bal. | – | – | – | 0.03 (max.) | 1.0 (max.) | 2.0 (max.) | 182 (27)a |
UNS S31254 | 19.5 to 20.5 | 6.0 to 6.5 | 17.5 to 18.5 | – | 0.18 to 0.22 | bal. | – | – | 0.50 to 1.0 | 0.020 (max.) | 0.80 (max.) | 1.0 (max.) | 310 (45) |
Martensitic and precipitation hardened-martensitic stainless steels | |||||||||||||
 UNS S41000 | 11.5 to 13.5 | – | – | – | – | bal. | – | – | – | 0.15 (max.) | 1.0 (max.) | 1.0 (max.) | 550 (80)e |
 UNS S17400 | 15.0 to 17.5 | – | 3.0 to 5.0 |  | – | bal. | 0.15 to 0.45 | – | 3.0 to 5.0 | 0.07 (max.) | 1.0 (max.) | 1.0 (max.) | 724 (105)f |
