... MATERIAL:Q235B-Q345B,L175-L485,16MN,L290-L360,X42-X70 SY,GB,API5L PSL-1,2 DESCRIPTION:BLACK STEEL PIPEEXECUTIVE STANDARD ... :1.API SPEC 5L SPECIFICATION FOR LINE PIPE.2.SY/T5037(CHINESE STANDARD)FOR LOW PRESSURE LIQUID TRANSPORTION.3.GB ... CUSTOMERS REQUIREMENTS.6.STANDARD: API-5l GB/T9711.1-1997 SY/T5037-2000 GB/T19001-2000 GB/T 24001-2004 GB ...