Marine 40kg heat mechanical control rolling thick plate steel and manufacturing method thereof

Abstract

The invention discloses a TMCP-type F40 steel with excellent low-temperature toughness and a manufacturing method thereof. The TMCP-type F40 steel comprises the following chemical components in percentage by weight: 0.010-0.12 percent of C, 0.3-2.0 percent of Mn, less than 0.6 percent of Si, less than 0.0030 percent of S, less than 0.015 percent of P, 0.010-0.120 percent of Nb, 0.005-0.030 percent of Ti, less than 0.120 percent of V, less than 0.060 percent of Al, less than 0.60 percent of Mo, less than 1.2 percent of Cu, less than 1.5 percent of Ni, less than 1.2 percent of Cr, less than 0.0040 percent of B, less than 0.01 percent of Ca, 0.003-0.010 percent of N, 0.001-0.006 percent of O, less than 0.0001 percent of Mg, and the balance of Fe and other inevitable impurities. The manufacturing method comprises the steps of smelting by a revolving furnace or an electric furnace, external refining, casting, slabs reheating as well as rolling control and cooling control. The product has excellent toughness, intensity and welding performance.

Description

technical field [0001] The invention relates to a steel material and a manufacturing method thereof, in particular to a marine 40-kilogram thermomechanically controlled rolled thick plate steel and a manufacturing method thereof. Background technique [0002] With the development of the shipbuilding industry, the requirements for the performance of ship plates are getting higher and higher. In addition to the increasing demand for steel plates with high strength, high surface quality, excellent toughness and weldability, the requirements for materials are also becoming more stringent. Classification societies of various countries have different technical requirements for ship plates, but the differences are not significant. According to the ship regulations of various countries' classification societies, ship plate steel is usually divided into general strength grades and high strength grades. General strength grades are divided into four quality grades of A, B, D and E, hi...

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Problems solved by technology

[0020] The purpose of the present invention is to provide a TMCP type F40 steel with excellent low temperature toughness and its manufacturing method through reasonable composition design and process design, so as to effectively reduce the production and manufacturing costs, increase the manufacturability of production, and make the product have high Strength level, high impact toughness and good welding performance, to solve the above-mentioned poor performance of products existing in the prior art, low efficiency of manufacturing methods and difficulty in meeting actual needs

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