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EN10025 S235JR steel and Q235B steel are two common structural steel materials, and the following is the detailed difference between them:

1. Standards and countries: EN10025 S235JR is a European standard, while Q235B is a Chinese standard, which is applicable to different countries and regions. EN10025 S235JR is widely used in Europe, while Q235B is the common steel standard in China.

2. Chemical composition: The chemical composition of the two is different. The main chemical components of EN10025 S235JR steel include carbon (C), silicon (Si), manganese (Mn), phosphorus (P) and sulfur (S), while the main chemical components of Q235B steel include carbon (C), silicon (Si), manganese (Mn), phosphorus (P) and sulfur (S). The specific chemical composition can be checked according to the provisions of the respective standards.

3. Mechanical properties: The mechanical properties of the two are also slightly different. EN10025 S235JR steel has a tensile strength of 360-510 MPa and a yield strength of 235 MPa. The tensile strength of Q235B steel is 370-500 MPa, and the yield strength is 235 MPa. These values are general guidelines and may vary in practice due to differences in material handling and manufacturing processes.

4. Metallurgical properties: EN10025 S235JR steel and Q235B steel also have some subtle differences in metallurgical properties. This includes melting point, coefficient of thermal expansion, thermal conductivity, etc., but for most structural applications, these differences are not critical factors.

5. Application range: Due to different standards and performance characteristics, S235JR steel and Q235B steel are different in the application range. EN10025 S235JR steel is mainly used in structural engineering in Europe, such as buildings, Bridges and steel structures. Q235B steel is widely used in various structural projects in China, including buildings, Bridges, transportation equipment and so on.

It is important to note that the specific choice of steel depends on factors such as project requirements, applicable standards and design specifications. In practical applications, materials should be selected according to specific needs, and the corresponding standards and specifications should be followed.