Influence of tempering temperature on properties of differences between a573 grade 70 and a588 grade K steel

How to quickly judge whether the price of differences between a573 grade 70 and a588 grade K steel, weathering steel plate is reasonable? What are the factors influencing the price quotation of differences between a573 grade 70 and a588 grade K steel, weathering steel plate? First of all, the material composition of weathering steel plate is different, and the corresponding performance and price are also different. Therefore, when we talk about the price of differences between a573 grade 70 and a588 grade K steel, weathering steel plate, we should first make clear of the material composition. Secondly, the specification especially the thickness of the differences between a573 grade 70 and a588 grade K steel, weathering steel plate will affect the quotation. Generally, the thicker the weathering steel plate, the higher the price.

Low-alloy high-strength steel grades are designed to have quite good notch toughness for their intended structural use. The applicability of the notch toughness of specific grades of low-alloy high-strength steel is either based on existing use experience or combined with the results of the impact test of notched specimens. In order to meet the very strict requirements of certain applications, some differences between a573 grade 70 and a588 grade K steel, low-alloy high-strength steels produced have excellent notch toughness. For example, controlled hot rolling technology is usually used to produce low-alloy high-strength steel plates for the manufacture of welded line pipes. Such steel pipes need to meet the requirements of relevant standards for notch toughness.

S355J2 steel plate differences between a573 grade 70 and a588 grade K steel rolling process is controlled rolling process. In the rolling process, the ingot rolling temperature is 1000-1050℃; in the first stage, the low-speed and large reduction rolling process is adopted, the high-temperature stage is 950-1000℃, the rolling speed is 1.6-2.0m/s, the differences between a573 grade 70 and a588 grade K steel single reduction rate is 15-20%, and the cumulative reduction rate is 40-45%, so as to ensure sufficient deformation of ingot. In the first stage, the start rolling temperature is 910-930℃, and the finish rolling temperature is ≤ 870℃.

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