standards:
API SPEC 5CT - the standard American Petroleum Institute
use:
for oil well casing and tubing with the seamless steel pipe
produce steel grades:
J55, K55, N80, L80, P110, etc.
Tolerance:
| steel types |
diameter (D) |
wall thickness (S) |
| pipe cold drawing |
pipe outside diameter (mm) |
allow deviation (mm) |
allow deviation (mm) |
| <114.3 |
± 0.79 |
-12.5% |
| ≥ 114.3 |
-0.5%, +1% |
mechanical properties:
| standards |
Grade |
tensile strength (MPa) |
yield strength (MPa) |
elongation (%) |
hardness |
| API SPEC 5CT |
J55 |
≥ 517 |
379 ~ 552 |
table |
|
| K55 |
≥ 517 |
≥ 655 |
|
| N80 |
≥ 689 |
552 ~ 758 |
|
| L80 (13Cr) |
≥ 655 |
552 ~ 655 |
≤ 241HB |
| P110 |
≥ 862 |
758 ~ 965 |
|
chemical composition:
| standards |
Grade |
chemical composition (%) |
| C |
Si |
Mn |
P |
S |
Cr |
Ni |
Cu |
Mo |
V |
Als |
| API SPEC 5CT |
J55K55
(37Mn5) |
0.34 ~ 0.39 |
0.20 ~ 0.35 |
1.25 ~ 1.50 |
≤ 0.020 |
≤ 0.015 |
≤ 0.15 |
≤ 0.20 |
≤ 0.20 |
|
|
≤ 0.020 |
| N80
(36 Mn2V) |
0.34 ~ 0.38 |
0.20 ~ 0.35 |
1.45 ~ 1.70 |
≤ 0.020 |
≤ 0.015 |
≤ 0.15 |
|
|
|
0.11 ~ 0.16 |
≤ 0.020 |
| L80 (13Cr) |
0.15 ~ 0.22 |
≤ 1.00 |
0.25 ~ 1.00 |
≤ 0.020 |
≤ 0.010 |
12.0 ~ 14.0 |
≤ 0.20 |
≤ 0.20 |
|
|
≤ 0.020 |
| P110
(30CrMo) |
0.26 ~ 0.35 |
0.17 ~ 0.37 |
0.40 ~ 0.70 |
≤ 0.020 |
≤ 0.010 |
0.80 ~ 1.10 |
≤ 0.20 |
≤ 0.20 |
0.15 ~ 0.25 |
≤ 0.08 |
≤ 0.020 |
steel specifications:
| material: 27SiMn (GB/T17396-1998) |
material: 27SiMn (GB/T17396-1998) |
material: 27SiMn (GB/T17396-1998) |
material: 27SiMn (GB/T17396-1998) |
| specifications |
number (t) |
origin |
specifications |
number (t) |
origin |
specifications |
number (t) |
origin |
specifications |
number (t) |
origin |
| 83 * 13 |
20 |
Tianjin |
127 * 10 |
15 |
Tianjin |
168 * 20 |
27 |
Tianjin |
245 * 27 |
13 |
Steel |
| 83 * 14 |
23 |
Tianjin |
127 * 17 |
25 |
Tianjin |
168 * 32 |
19 |
Tianjin |
245 * 32 |
16 |
Tianjin |
| 89 * 16 |
9 |
Tianjin |
133 * 16 |
27 |
Tianjin |
180 * 21 |
8 |
Tianjin |
273 * 27 |
30 |
Steel |
| 95 * 9.2 |
113 |
Tianjin |
133 * 16 |
20 |
Tianjin |
180 * 22 |
17 |
Tianjin |
273 * 30 |
15 |
Steel |
| 95 * 10 |
21 |
Tianjin |
133 * 22 |
19 |
Tianjin |
180 * 25 |
10 |
Tianjin |
273 * 36 |
10 |
Steel |
| 95 * 15 |
10 |
Tianjin |
140 * 18 |
12 |
Tianjin |
180 * 40 |
25 |
Tianjin |
299 * 30 |
25 |
Steel |
| 102 * 14 |
7 |
Tianjin |
146 * 14 |
27 |
Tianjin |
194 * 21 |
13 |
Tianjin |
325 * 30 |
20 |
Steel |
| 114 * 9.2 |
127 |
Tianjin |
152 * 17 |
10 |
Tianjin |
203 * 26 |
23 |
Tianjin |
377 * 35 |
18 |
Steel |
| 114 * 10 |
22 |
Tianjin |
159 * 16 |
24 |
Tianjin |
219 * 22 |
9 |
Tianjin |
|
|
|
| 114 * 19 |
19 |
Tianjin |
159 * 21 |
25 |
Tianjin |
219 * 25 |
16 |
Tianjin |
|
|
|
| 121 * 14 |
30 |
Tianjin |
168 * 18 |
34 |
Tianjin |
232 * 31 |
9 |
Tianjin |
|