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Rolling method for improving charpy impact performance of thick-gauge bridge steel
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A technology of Charpy impact and thick gauge, which is applied in the field of rolling to improve the Charpy impact performance of thick gauge bridge steel, and can solve problems such as difficult to meet
Inactive Publication Date: 2019-02-01
ANGANG STEEL CO LTD
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[0002] Before the implementation of the new GB / T 714-2015 national standard for structural steel for bridges, the Charpy impact performance requirements of Q500qE steel plates in the national standard GB / T 714-2008 for structural steel for bridges implemented were ≥ 47J, and conventional low temperature controlled rolling was adopted. The method of production can meet the requirements, but after the implementation of the new version of GB / T 714-2015 national standard for bridge structural steel, the Charpy impact performance requirement is increased to ≥120J, and the conventional low temperature controlled rolling method is difficult to meet
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[0023] 1) The temperature of the billet out of the furnace is controlled between 1200-1230°C;
[0024] 2) After the steel billet is released from the furnace, it is descaled, and after descaling, it is stretched and rolled, and after the stretched rolling is completed, it is waited for temperature;
[0025] 3) When the temperature reaches 1000°C-1030°C, continue rolling, and when rolling to a thickness of 119mm-132mm, continue to wait for temperature;
[0026] 4) When the temperature reaches 920°C-940°C, continue rolling, and when rolling to a thickness of 80mm-88mm, continue to wait for temperature;
[0027] 5) When the temperature reaches 800°C-820°C, continue rolling until the thickness of the finished product is 44mm, and control the final rolling temperature between 750°C-770°C.
[0028] As shown in Table 1, the impact value of the product in this example is between 252 and 321J.
[0033] 1) The temperature of the billet out of the furnace is controlled between 1210-1240°C;
[0034] 2) After the steel billet is released from the furnace, it is descaled, and after descaling, it is stretched and rolled, and after the stretched rolling is completed, it is waited for temperature;
[0035] 3) When the temperature reaches 1020-1050°C, continue rolling, and when rolling to a thickness of 152-168mm, continue to wait for temperature;
[0036] 4) When the temperature reaches 930-950°C, continue rolling, and when rolling to a thickness of 101-112mm, continue to wait for temperature;
[0037] 5) When the temperature reaches 810-830°C, continue rolling until the thickness of the finished product is 56mm, and control the final rolling temperature between 760-780°C.
[0038] As shown in Table 2, the impact value of the product in this example is between 223J and 286J.
[0039] Table 2:
[0040] batch num...
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Abstract
The invention provides a rolling method for improving the charpy impact performance of thick-gauge bridge steel. According to the rolling method for improving the charpy impact performance of the thick-gauge bridge steel, after broadening rolling is performed, three-stage temperature control rolling is performed on a steel plate to improve austenite recrystallization tissue changes, and the charpyimpact performance of the steel plate is improved. Compared with the prior art, the rolling method for improving the charpy impact performance of the thick-gauge bridge steel has the beneficial effects that by means of the rolling method for improving the charpy impact performance of the thick-gauge bridge steel, the charpy impact performance value of the thick-gauge high-strength bridge beam steel plate is improved, the charpy impact performance value requirement (larger than or equal to 120 J) of the iron standard is met, the control process capacity of the charpy impact performance index is improved, and performance qualification rate guarantee is provided for mass production.
Description
technical field [0001] The invention belongs to the technical field of hot-rolled strips, and in particular relates to a rolling method for improving the Charpy impact performance of thick-gauge bridge steel. Background technique [0002] Before the implementation of the new GB / T 714-2015 National Standard for Bridge Structural Steel, the Charpy impact performance requirement of Q500qE steel plate in the implemented GB / T 714-2008 Bridge Structural Steel National Standard is ≥ 47J, and conventional low temperature controlled rolling is adopted. The method of production can meet the requirements, but after the implementation of the new version of GB / T 714-2015 national standard for structural steel for bridges, the Charpy impact performance requirement has been increased to ≥120J, and the conventional low-temperature controlled rolling method is difficult to meet. Contents of the invention [0003] The invention provides a rolling method for improving the Charpy impact perfo...
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