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Tower material
2023-02-28
Generally, Q235, Q345 and Q420 steel are used for power tower. The letters Q and the numbers 235 and 345 of Q235 and Q345 steel respectively represent the letters and values of yield point.
*Yield point - The phenomenon that the load of the metal specimen does not increase during the tensile process, but the specimen continues to deform is called "yield". The stress at which yield occurs is called yield point or yield strength.
It is specified that Q235 steel shall be marked in red, Q345 steel shall be marked in white and Q420 steel shall be marked in green.
The quality grade of steel is divided into five grades of ABCDE, which increase from A to E. It is mainly due to the difference of impact temperature caused by different content of phosphorus and sulfur and other microelements. A - impact test is not required, B-20/C-0/D-20/E-40 (A does not require impact test, BCDE impact test temperature is+20 ° 0 ° - 20 ° 40 ° - 40 °).
*Q235 quality grade is divided into four grades: A, B, C and D. A to D indicates the quality from low to high.
*The quality grade of Q345 steel plate is divided into five grades: A, B, C, D and E
*A - Provide S, P, C, Mn, Si chemical composition and fu, fy δ 5（ δ 10) 1800 cold bending test can be provided according to the Buyer's requirements, but the carbon content and manganese content are not considered as the delivery conditions without the provisions of impact energy.
*B - Provide S, P, C, Mn, Si chemical composition and fu, fy δ 5（ δ 10) , 180 ° cold bending test. It also provides impact energy Ak ≥ 27J at+20 ℃
*C - In addition to the requirements of Class B, the impact energy Ak ≥ 27J at 0 ℃ is also provided.
*D --- In addition to the requirements of Class B, the impact energy Ak ≥ 27J at - 20 ℃ is also provided
*E - In addition to the requirements of Class B, the impact energy Ak ≥ 27J at - 40 ℃ is also provided.
*Yield point - The phenomenon that the load of the metal specimen does not increase during the tensile process, but the specimen continues to deform is called "yield". The stress at which yield occurs is called yield point or yield strength.
It is specified that Q235 steel shall be marked in red, Q345 steel shall be marked in white and Q420 steel shall be marked in green.
The quality grade of steel is divided into five grades of ABCDE, which increase from A to E. It is mainly due to the difference of impact temperature caused by different content of phosphorus and sulfur and other microelements. A - impact test is not required, B-20/C-0/D-20/E-40 (A does not require impact test, BCDE impact test temperature is+20 ° 0 ° - 20 ° 40 ° - 40 °).
*Q235 quality grade is divided into four grades: A, B, C and D. A to D indicates the quality from low to high.
*The quality grade of Q345 steel plate is divided into five grades: A, B, C, D and E
*A - Provide S, P, C, Mn, Si chemical composition and fu, fy δ 5（ δ 10) 1800 cold bending test can be provided according to the Buyer's requirements, but the carbon content and manganese content are not considered as the delivery conditions without the provisions of impact energy.
*B - Provide S, P, C, Mn, Si chemical composition and fu, fy δ 5（ δ 10) , 180 ° cold bending test. It also provides impact energy Ak ≥ 27J at+20 ℃
*C - In addition to the requirements of Class B, the impact energy Ak ≥ 27J at 0 ℃ is also provided.
*D --- In addition to the requirements of Class B, the impact energy Ak ≥ 27J at - 20 ℃ is also provided
*E - In addition to the requirements of Class B, the impact energy Ak ≥ 27J at - 40 ℃ is also provided.
Q345A，Q345B，Q345C，Q345D，Q345E。 This is the classification of grades, which mainly represents that the impact temperature is different, while Q345A grade does not impact; Q345B, impact at 20 ℃; Q345C, 0 degree impact;
