API 5L generally refers to line pipe–API 5L line pipe, the line pipe is to transport the oil, steam and water extracted from the ground to the oil and gas industry enterprises through the line pipe. The line pipe includes seamless pipe and welded steel pipe. The ends have flat ends, threaded ends and socket ends; the connection methods are welding, coupling connection, socket connection, etc.
| PSL | Delivery Condition | Pipe grade |
| PSL1 | As-rolled, normalized, normalizing formed | A |
| As-rolled, normalizing rolled, thermomechanical rolled, thermo-mechanical formed, normalizing formed, normalized, normalized and tempered or if agreed Q&T SMLS only | B | |
| As-rolled, normalizing rolled, thermomechanical rolled, thermo-mechanical formed, normalizing formed, normalized, normalized and tempered | X42, X46, X52, X56, X60, X65, X70 | |
| PSL 2 | As-rolled | BR, X42R |
| Normalizing rolled, normalizing formed, normalized or normalized and tempered | BN, X42N, X46N, X52N, X56N, X60N | |
| Quenched and tempered | BQ, X42Q, X46Q, X56Q, X60Q, X65Q, X70Q, X80Q, X90Q, X100Q | |
| Thermomechanical rolled or thermomechanical formed | BM, X42M, X46M, X56M, X60M, X65M, X70M, X80M | |
| Thermomechanical rolled | X90M, X100M, X120M | |
| The suffice (R, N, Q or M) for PSL2 grades, belongs to the steel grade |
1. The main production process of hot-rolled seamless steel pipe (main inspection process):
Tube blank preparation and inspection→tube blank heating→piercing→tube rolling→steel reheating→fixed (reduced) diameter→heat treatment △→finished tube straightening→finishing→inspection (non-destructive, physical and chemical, Taiwan inspection)→warehousing
2. The main production process of cold-rolled (drawn) seamless steel pipes:
Billet preparation→pickling lubrication→cold rolling (drawing)→heat treatment→straightening→finishing→inspection
