International standard system

The main international standards followed by the export of seamless steel pipes in the international standard system include:
American standards such as ASTM A53-98 (Seamless Steel Tubes for General Use), ASTM A192 (Seamless Steel Tubes for High Pressure Boilers), and ASME S192 (Boiler and Pressure Vessel Code) [1].
Japanese standards: JIS G3452-1998 (seamless steel pipes for pipelines) and JIS G3454-1998 (seamless steel pipes for high-pressure pipelines) [1].
German standard: DIN 1629-1984 (Technical delivery conditions for seamless steel pipes) [1].
These standards provide clear regulations on material chemical composition, mechanical properties, and dimensional tolerances to ensure the reliability of products under complex working conditions