1. Rockwell hardness of 304 stainless steel
304 stainless steel is a commonly used austenitic stainless steel with good corrosion resistance and processing performance. Rockwell hardness is a common method to measure the hardness of a material. The hardness value of the material is determined by measuring the indentation depth. The Rockwell hardness of 304 stainless steel is usually between HRB70-90, and the specific value depends on the heat treatment state and test conditions of the material. Generally speaking, the hardness of 304 stainless steel is moderate, which can meet certain strength requirements and has good plasticity, which is easy to process and shape.
2. Rockwell hardness of Inconel 625
Inconel 625 is a nickel-based high-temperature alloy known for its excellent high-temperature corrosion resistance and good mechanical properties. Compared with 304 stainless steel, the Rockwell hardness of Inconel625 is usually higher. According to relevant information, the Rockwell hardness of Inconel625 can reach about HRC30-45. This high hardness enables Inconel625 to maintain good strength and wear resistance in harsh environments such as high temperature and high pressure.
3. Reasons for the hardness difference
The difference in Rockwell hardness between 304 stainless steel and Inconel625 is mainly due to their material composition and microstructure. 304 stainless steel is mainly composed of iron, chromium, nickel and other elements, and its austenite structure gives it good plasticity and toughness. Inconel625 contains higher nickel, chromium, molybdenum, niobium and other elements, and the addition of these elements enhances the strength and hardness of the alloy. In addition, the microstructure of Inconel625 is more complex, with a higher dislocation density and stronger interatomic bonding force, which increases its hardness.
