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In the global industrial system, steel pipes, as "industrial blood vessels", undertake core functions such as transmission, support, and protection. Carbon steel pipes, stainless steel pipes and alloy steel pipes have formed completely different performance maps due to differences in composition and process. In the fields of automobile manufacturing, energy and chemical industry, aerospace, etc., the three have shown their strengths: carbon steel is the king for its cost-effectiveness, stainless steel is based on its corrosion resistance, and alloy steel breaks the deadlock with high strength. This article will take materials science as the anchor and combine the latest industry trends in 2025 to systematically analyze the performance boundaries and application logic of Class III steel pipes.