What is the difference between stainless steel 40Cr round rod and 40Cr13 round rod

　　40Cr is the standard steel number of GB in China, 40Cr steel is one of the most widely used steel in the machinery manufacturing industry. It has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity after tempering.

　　Stainless steel 40Cr round rod hardenability is good, water quenching can be quenched to 28 ~ 60mm, oil quenching can be quenched to 15 ~ 40mm. In addition to tempering treatment, this steel is also suitable for cyaniding and high-frequency quenching treatment. When the hardness is 174 ~ 229HB, the relative machinability is 60%. Stainless steel 40Cr round rod is suitable for making medium-sized plastic molds.

　　Ferritic stainless steel: 15% ~ 30% chromium. Its corrosion resistance, toughness and weldability increase with the increase of chromium content, and the chloride stress corrosion resistance is better than other types of stainless steel, which belongs to this category Crl7. Cr17Mo2Ti, Cr25. Cr25Mo3Ti, Cr28 and so on. Ferritic stainless steel has good corrosion resistance and oxidation resistance because of its high chromium content.