When purchasing martensitic stainless steel grades such as 420J1, 420J2 or 4Cr13, suppliers typically provide a Mill Test Certificate (MTC). The grade, chemical composition and test results on the certificate should match both the purchase requirements and the material delivered. For blades, cutting

IntroductionMartensitic stainless steels are known for their high hardness, excellent wear resistance, and moderate corrosion resistance. But not all martensitic stainless steels are the same—carbon content plays a critical role in determining their properties and suitability for different applicati