A kind of extra-thick quenched and tempered marine engineering eh40 steel and its preparation method

Abstract

The invention relates to extra-thick tempering EH40 steel for ocean engineering. A steel plate comprises the following chemical components by weight percent: 0.12 to 0.15 percent of C, 0.15 to 0.50 percent of Si, 1.30 to 1.60 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.0050 percent of S, 0.020 to 0.050 percent of Nb, 0.020 to 0.050 percent of V, 0.008 to 0.020 percent of Ti, 0.15 to 0.40 percent of Ni, 0.10 to 0.20 percent of Cr, and balance of Fe and unavoidable impurity elements. The manufacturing process of the steel plate comprises the steps of smelting, casting, reheating, rolling and tempering. The tempering process is used for substituting the normalizing process to produce a low-scaling-ratio extra-thick plate, so that the adverse effect caused by the center segregation can be avoided.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a quenched and tempered EH40 steel for marine engineering with a thickness of 100-120 mm and a preparation method thereof. Background technique [0002] With the rapid development of the world economy and the depletion of energy resources, the focus of resource development has shifted from the land to the ocean, and marine resources have become the object of competition among countries all over the world. The development prospects of marine engineering equipment for offshore oil and gas drilling and production operations and the derived military equipment and seaside equipment resources are broad. With the continuous development of marine equipment technology, offshore platforms and marine equipment are gradually developing towards large tonnage and deep sea, and there are higher requirements for steel used in marine engineering in terms of strength, low tempe...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a kind of EH40 steel for quenching and tempering marine engineering with a thickness of 100 mm to 120 mm and its preparation method in view of the above-mentioned prior art. Toughness value, low temperature strain aging resistance, good welding performance, bending performance, etc., and overcome the shortcomings of poor uniformity in the thickness direction of extra-thick plates

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