Ferrite is a carbon solid solution in α-Fe, often represented by the symbol "F." In stainless steel, "ferrite" refers to the carbon solid solution in α-Fe, which has a very low carbon solubility. It can only dissolve about 0.0008% carbon at room temperature and has a maximum carbon solubility of 0.02% at 727°C. Ferrite maintains a body-centered cubic lattice structure and is often represented by the symbol "F.
Due to its low carbon content, ferrite exhibits properties similar to pure iron, including good ductility and toughness, with an elongation (δ) of approximately 45% to 50%. It has lower strength and hardness, with a tensile strength (σb) of approximately 250 MPa and a Brinell hardness (HBS) of about 80.
Ferritic stainless steel, in the context of stainless steel in its service state, primarily consists of a ferritic microstructure. Its chromium content ranges from 11% to 30%, and it has a body-centered cubic crystal structure. The iron content of stainless steel is not related to whether it is ferritic stainless steel or not. Ferritic stainless steel depends solely on whether, in its service state, it consists mainly of a ferritic microstructure, which is magnetic.
Austenite is a carbon solid solution in γ-Fe, often represented by the symbol "A." It maintains the face-centered cubic crystal lattice of γ-Fe. It has a relatively high carbon solubility, dissolving about 0.77% carbon at 727°C and up to 2.11% carbon at 1148°C. Austenite is a microstructure that can be stable only at temperatures higher than 727°C. Austenite is ductile and is the microstructure required for most steel grades when subjected to hot working at elevated temperatures. Austenite is non-magnetic.
Due to its low carbon content, ferrite exhibits properties similar to pure iron, including good ductility and toughness, with an elongation (δ) of approximately 45% to 50%. It has lower strength and hardness, with a tensile strength (σb) of approximately 250 MPa and a Brinell hardness (HBS) of about 80.
Ferritic stainless steel, in the context of stainless steel in its service state, primarily consists of a ferritic microstructure. Its chromium content ranges from 11% to 30%, and it has a body-centered cubic crystal structure. The iron content of stainless steel is not related to whether it is ferritic stainless steel or not. Ferritic stainless steel depends solely on whether, in its service state, it consists mainly of a ferritic microstructure, which is magnetic.
Austenite is a carbon solid solution in γ-Fe, often represented by the symbol "A." It maintains the face-centered cubic crystal lattice of γ-Fe. It has a relatively high carbon solubility, dissolving about 0.77% carbon at 727°C and up to 2.11% carbon at 1148°C. Austenite is a microstructure that can be stable only at temperatures higher than 727°C. Austenite is ductile and is the microstructure required for most steel grades when subjected to hot working at elevated temperatures. Austenite is non-magnetic.
Post time: Nov-16-2023