80Kg grade steel plate with ultrahigh toughness and extreme thickness and manufacturing method of the steel plate
An ultra-high toughness, kilogram-level technology, which is applied in the field of 80-kg ultra-high toughness, extremely thick steel plates and its manufacturing, can solve the problems of uneven strength and toughness of extra-thick quenched and tempered steel plates
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[0056] The present invention will be further described below in conjunction with embodiments.
[0057] Table 1 shows the steel composition of the embodiment of the present invention, and Table 2, Table 3, and Table 4 are the manufacturing processes of the steel of the embodiment of the present invention. Table 5 and Table 6 show the properties of the steel in the example of the present invention.
[0058] From figure 1 As can be seen from Table 5 and Table 6, the microstructure of the steel plate of the present invention is fine tempered bainite + tempered martensite, and the average crystal cluster size is below 20 μm; excellent toughness, strong plasticity matching and welding Excellent performance.
[0059] To sum up, the present invention combines the combination design of steel plate alloy elements with the special quenching and tempering process (CR+QT) to obtain excellent ultra-thick (≥100mm) quenched and tempered steel plate strength, ultra-low temperature toughness and st...
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