... Boiler,lowand Medium Pressure Boilers, high pressure --Chemical fertilizer equipment, petroleum cracking SpecificationsChina StandardSteel GradeStandardseamless steel tubesGB/T8162-199910, 20, 35 ... tubesGB9948-8610, 20, 12CrMo, 15CrMo, 1Cr2Mo, 1Cr5Mo, JIS G3441-1988for petroleum cracking api 5l x65 psl2 steel pipe