A kind of 390mpa grade steel plate for large-thickness marine engineering and its manufacturing method
A marine engineering and large-thickness technology, which is applied in the field of steel material preparation, can solve the problems of inability to meet the needs of large-thickness dimensions and high manufacturing costs, achieve fine and uniform grain structure, uniform product performance, and improve low-temperature toughness and yield The effect of intensity
Active Publication Date: 2018-02-27
ANGANG STEEL CO LTD
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Problems solved by technology
The manufacturing cost is high, and it cannot meet the demand for large thickness dimensions of steel used in marine engineering
Method used
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[0043] Below by embodiment the present invention will be further described.
[0044] The embodiments of the present invention carry out smelting, heating, rolling and cooling according to the composition ratio of the technical solution. The composition of the steel of the embodiment of the present invention and the comparative example is shown in Table 1. The main technological parameters of the steels of the embodiment of the present invention and the comparative example are shown in Table 2. Table 3 shows the tensile properties and impact energy values of the steel of the embodiment of the present invention and the comparative steel.
[0045] The composition (wt %) of steel of the embodiment of the present invention and comparative example of table 1
[0046] Example
C
Si
mn
P
S
Ni
Cu
Nb
Ti
als
V
N
1
0.08
0.33
1.50
0.014
0.002
0.34
0.24
0.04
0.013
0.031
0.03
0.003
2
0....
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Abstract
The invention provides a large-thickness 390 MPa level steel plate used for ocean engineering and a manufacturing method of the steel plate. The steel plate comprises, by weight, 0.06%-0.16% of C, 0.2%-0.5% of Si, 0.9%-1.6% of Mn, 0.1%-0.3% of Cu, 0.2%-0.5% of Ni, less than or equal to 0.02% of P, less than or equal to 0.02% of S, 0.03%-0.05% of Als, 0.002%-0.005% of N, 0.02%-0.05% of Nb, 0.01%-0.02% of Ti, 0.03%-0.06% of V, and the balance Fe and inevitable impurities. The manufacturing method comprises the steps of smelting, heating, rolling and cooling, specifically, rolling is controlled in two stages, and recrystallization zone rolling is conducted in the first stage; and cooling is conducted through a laminar cooling system with the cooling speed larger than 10 DEG C / s, the re-reddening temperature is controlled to be 400-450 DEG C, and then the steel plate is subjected to air cooling to the room temperature. The large-thickness 390 MPa level steel plate is small and uniform in grain structure and good in low-temperature impact toughness. The manufacturing method of the steel plate is easy to implement, the uniformity of product performance is good.
Description
technical field [0001] The invention belongs to the field of iron and steel material preparation, and in particular relates to a steel for marine engineering with low-temperature high impact toughness, large thickness and high strength and a manufacturing method thereof. . Background technique [0002] With the continuous development of marine equipment manufacturing technology, the demand for steel plates used is increasing, especially for steel plates with high strength, high and low temperature toughness and large thickness. Manufacture of high-strength toughness and large-thickness steel plates according to conventional production methods will inevitably require slabs with large-thickness sections as rolling conditions. In addition, it is necessary to carry out quenching and tempering heat treatment on the rolled steel plates, but this will inevitably increase production costs and reduce production. efficiency. [0003] In the method disclosed in "A Rolling Method of F...
Claims
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IPC IPC(8): C22C38/16C21D8/02
Inventor 周成严玲陈华张鹏黄松王勇海天
Owner ANGANG STEEL CO LTD