... WT: SCH 40 SCH80 SCH160 2-60mmExecutive standards: GB, ASME API 5L, ASTM A106/A53, Despite of the above standards, we ... standard of DIN, JIS and so on, and also develop new products according to the requirements of our clients.Surface: black ... cracking, chemical fertilizer equipment, drawing-oil-equipment and structure purposes. API 5L X42/X52/X60/X70 Pipe