Pipe technology research and development, technical services; steel-plastic composite pipes, coated steel pipes, hot-dipped galvanized steel pipes. High-density polyethylene water supply pipes, polyvinyl chloride water supply pipes, high-voltage cable protection plastic pipes, agricultural irrigation pipes and accessories, modified polypropylene cable protection pipes, power conduits, steel strip pipes, corrugated pipes, underfloor heating pipes, fiber optic pipes, grate pipes, irrigation equipment research, production, and sales; goods or technology import and export (excluding goods or technology import and export prohibited by the state or involving administrative approval).