Chinese GB 9Cr18MoV and AISI 440C are the most-quoted martensitic stainless steels for industrial blades that need corrosion resistance. They are not identical — the Mo and V content make 9Cr18MoV the tougher of the two. Here is the engineering comparison.
An Indian pharma converter cutting 50 µm 304 stainless foil at 80 m/min was getting 7 days from a D2 slitter. The fix was a 9Cr18MoV stainless slitter. 35 days. The case study walks through the audit, the trial, and the FDA / GMP compliance angle.
A runnable cross-reference table for cold-work tool steel, high-speed steel, martensitic stainless and carbide grades. Find the equivalent of AISI D2, M2, M4, 440C, 9Cr18MoV, YG6X, YG8 and 30+ other grades across ASTM/AISI, JIS, DIN/EN/W.-Nr., GB, BS, AFNOR, UNI, SS and UNE.
AISI 440C is the standard martensitic stainless steel for industrial cutting tools, bearings and food-contact blades. High-carbon, 17 % Cr, hardened to HRC 58–60. Cross-reference to 9Cr18MoV, 1.4125, 11Cr17.