Variant of North American Industry Classification System (NAICS) 2022 Version 1.0 for Industrial production (based on the 2008 International Recommendations for Industrial Statistics)

• 1 - Industrial production
• 31-33 - Manufacturing
• 331 - Primary metal manufacturing
• 3312 - Steel product manufacturing from purchased steel

33121 - Iron and steel pipes and tubes manufacturing from purchased steel

This industry comprises establishments primarily engaged in the production of welded or seamless iron and steel pipes and tubes, and heavy, rivetted steel pipes, from purchased steel.