Is there any difference between PSL1 steel tube and PSL2 steel tube?

PSL is the abbreviation of product specification level. PSL1 and PSL2 of SUBMERGED arc welding tube of GB/T9711-2011 are roughly different as follows:

1. The delivery status of PSL1 steel pipe shall be chosen by the manufacturer, and the delivery status of PSL2 steel pipe shall meet the requirements of the steel name in the order contract.

2. PSL2 steel tube shall be fine grain killed steel, PSL1 is not specified.

3. The steel strip or steel plate used for manufacturing PSL2 steel pipe shall not have any repair welding seam, and the pipe body shall not be repaired welding;There is no such requirement for PSL1 steel pipe.

4. PSL1 and PSL2 steel tubes of the same strength grade have different chemical compositions.

5. Maximum steel grade L485/X70 for PSL1 steel pipe and L830M/X120M for PSL2 steel pipe.

6. The yield strength and tensile strength of PSL1 steel tube are only specified at the minimum value, not the maximum value, nor the buckling value;PSL2 steel tube not only specifies the minimum value of yield strength and tensile strength, but also specifies the maximum value of buckling ratio.

7. The body and weld of PSL2 steel tube are required to do impact test (CVN), while PSL1 steel tube is not required.The tube body of PSL2 steel tube requires drop weight test (DWT), while PSL1 steel tube does not.

The above is the main difference between PSL1 and PSL2 steel tubes. Although not comprehensive, it reflects that the quality requirements of PSL2 steel tubes are generally higher than those of PSL1 steel tubes. Moreover, PSL2 steel tubes often have additional technical requirements in detail when the contract is signed.