1. The steel grades involved are A25, A, B, X42, X46, X52, X56, X60, X65, X70, X80 and any intermediate steel grade (the intermediate grade between two adjacent standard grades with steel grades higher than X42 shall be negotiated by the supply and demand parties).
2. For PSL1 grade pipes, A25 to X70 grade steel is supplied.
3. For PSL2 grade pipes, B to X80 grade steel is supplied.
4. Without the permission of the purchaser, the supplier shall not replace the ordered steel pipes of X52 grade or below with steel pipes of X60 or above.
5. Class II steel (ClⅡ) is rephosphorus steel, which has better thread processing performance than Class I steel (ClⅠ) in most cases. The reason is that Class II steel has a higher phosphorus content than Class I steel, making it more difficult to bend.
