20#,45# ,st37,st52,ck45 seamless steel pipe
| OD | thickness | OD | thickness |
| mm | mm | mm | mm |
| 25 | 2.5-3-4-5-6 | 51 | 2.5-3-4-5-6-8-10-12-14-16 |
| 26 | 2.5-3-4-5-6 | 52 | 2.5-3-4-5-6-8-10-12-14-16 |
| 27 | 2.5-3-4-5-6-7-8 | 54 | 3-4-5-6-8-10-12-14-16 |
| 28 | 2.5-3-4-5-6-7-8 | 57 | 3-4-5-6-8-10-12-14-16 |
| 30 | 2.5-3-4-5-6-7-8 | 60 | 3.5-4-5-6-8-10-12-14-16 |
| 32 | 2.5-3-4-5-6-7-8-9-10 | 63.5 | 3.5-4-5-6-8-10-12-14-16 |
| 34 | 2.5-3-4-5-6-7-8-9-10 | 65 | 3.5-4-5-6-8-10-12-14-16 |
| 35 | 2.5-3-4-5-6-7-8-9-10 | 68 | 4-5-6-8-10-12-14-16 |
| 36 | 2.5-3-4-5-6-7-8-9-10 | 70 | 4-5-6-8-10-12-14-16 |
| 38 | 2.5-3-4-5-6-7-8-9-10-12 | 73 | 4-5-6-8-10-12-14-16 |
| 40 | 2.5-3-4-5-6-7-8-9-10-12 | 76 | 5-6-8-10-12-14-16 |
| 42 | 2.5-3-4-5-6-7-8-9-10-12-14 | 80 | 5-6-8-10-12-14-16 |
| 45 | 2.5-3-4-5-6-7-8-9-10-12-14 | 83 | 5-6-8-10-12-14-16 |
| 48 | 2.5-3-4-5-6-7-8-9-10-12-14 | 89 | 6-8-1-12-14-16 |
| 50 | 2.5-3-4-5-6-8-10-12-14-16 | 95 | 6-8-10-12-14-16 |