The manufacturer of stainless steel seamless tubes produces a grade of stainless steel in accordance with the American ASTM standard (ASTM A276-2006 Stainless Steel Bars and Shapes). Characteristics and Applications: Due to a carbon content of approximately 0.31%, it has higher hardness after quenching than 2Cr13 (with a carbon content of approximately 0.20%), making it suitable for knife blades, nozzles, valve seats, valves, and more. However, with only 0.75% or less of the corrosion-resistant element NI, its corrosion resistance is limited, and thus Grade 420 is prone to rust.