... Pressure Boiler,low and Medium Pressure Boilers, high pressure --Chemical fertilizer equipment, petroleum crackingSpecificationsChina StandardSteel GradeStandardseamless steel tubesGB/T8162-199910, 20, 35 ... , 12CrMo, 15CrMo, 12Cr2MoISO 9329-2-1997 for high pressure --Chemical fertilizer equipmentASTM A161-94Seamless steel tubesGB9948-8610, 20, 12CrMo, 15CrMo, 1Cr2Mo ...