16MnCr5 / 1.7131 Pipe: A medium-carbon alloy steel pipe, 16MnCr5 (1.7131) offers excellent case hardening properties for improved surface wear resistance. Commonly used in automotive and engineering applications, it provides a durable surface layer while maintaining toughness in the core. Ideal for components like gears, shafts, and mechanical parts that require strength and resilience.