API 5L PSL1 Gr.A high-frequency straight seam electric resistance welded pipes are API 5L Gr.A ERW steel pipes, and ERW is short for phrase High-frequency straight seam electric resistance welded.

Moreover, API 5L X56 helical seam submerged-arc welded steel pipes are also known as submerged-arc welded steel pipes, namely, API 5L X56 SSAW steel pipes.

St 52-3 square tubes application:St 52-3 square tubes can be used in gas and oil transportation,heating surface pipe, economizer, superheater, reheater tube, petrochemical industry, etc

e can according to your requirement for St37-2 steel pipes, St37-2 steel pipes demand quantity and destination port, give you the best price.