Preparation method and application of 700 MPa grade ultra-fine grain high-strength weathering steel
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An ultra-fine-grained, weathering steel technology, applied in the metallurgical field, can solve the problems of high energy consumption, increased production line length, hot-rolled surface quality and product specifications that cannot meet the requirements of downstream users, etc. Effect
Inactive Publication Date: 2017-11-21
UNIV OF SCI & TECH BEIJING +1
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Problems solved by technology
[0005] The traditional rolling process has the disadvantages of increased production line length, complex equipment composition, high operation and maintenance costs, and high energy consumption.
And because the production line is too long (above 400m), the temperature at the entrance of fine rolling cannot be accurately controlled, resulting in unstable final product performance
In addition, the surface quality and product specifications of the hot-rolled sheets produced by traditional single-slab rolling or semi-endless rolling cannot meet the requirements of downstream users, and hot-rolled sheets after pickling generally need to undergo subsequent cold-rolling and annealing processes before they can be supplied. , so that the production process is complicated, the production efficiency is reduced, and the production cost is increased.
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Embodiment 1
[0089] The present embodiment provides a kind of preparation method of 700MPa grade ultra-fine grain high-strength weathering steel applied in ESP production line, such as Figure 1-Figure 4 shown. Its technological process is as follows:
[0090] Firstly, tundish molten steel is prepared: the initial raw materials are melted to obtain molten iron, and then refined in BOF converter, LF furnace, and RH refining furnace in sequence to obtain the tundish molten steel.
[0091] Then said tundish molten steel is dropped into such as figure 1 ESP line shown.
[0092] In the ESP production line, the finished thin slab is obtained through the steps of continuous casting→rough rolling→intermediate slab treatment→finish rolling→laminar cooling→coiling.
[0093] The tundish molten steel passes through the straight arc continuous casting machine 2 to form a continuous casting slab with a thickness of 90mm.
[0094] The continuous casting slab directly enters the 3-stand rough rolling ...
Embodiment 2
[0123] The method used in this example is basically the same as Example 1, except that the composition of the initial raw materials, the mass fraction, the relevant process parameters in the preparation method, and the product specifications, The average grain size and mechanical properties are different.
[0124] The composition, mass fraction and related process parameters in the preparation method of the initial raw materials are shown in Table 2-1 below. The product specifications, average grain size and mechanical properties of the 700MPa grade ultra-fine-grained high-strength weathering steel are shown in Table 2-2 below.
[0125] Table 2-1 Composition, mass fraction of initial raw materials and relevant process parameters in the preparation method
[0126]
[0127] According to the preparation method of the present invention and the application of the composition, mass fraction of initial raw materials and relevant process parameters in the preparation method in the...
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Abstract
The invention relates to a preparation method and application of 700 MPa grade ultra-fine grain high-strength weathering steel. The preparation method includes the steps that a continuous casting blank directly enters an M rack rough rolling unit at a high pulling speed and is subject to M-gate continuous high reduction (50%-60%) rough rolling, austenite grains are greatly refined, after rough rolling is carried out, an intermediate billet is quickly heated by an induction heating furnace to the temperature needed by a finish rolling inlet, and meanwhile a reverse temperature field is formed; and then the blank sequentially passes through a finish rolling unit, a laminar cooling part and a reeling machine, and the microstructure characteristics that the surfaces and core parts are thick and 1/4 thickness parts are thin are finally formed. In the production process, finish rolling and rough rolling are both full-endless rolling. By means of the preparation method, an ultra-fine grain high-strength weathering steel strip with the weather fastness equal to that of corten-A can be obtained, the effects of replacing thick parts with thin parts and replacing cold with heat are achieved, and the automotive body weight is small; and meanwhile, the service life of an automotive sheet is prolonged, the production efficiency is improved, the production cost is reduced, energy consumption is reduced, emission is reduced, and resource-saving and environment-friendly production is achieved. The preparation method and application belong to the technical field of metallurgy.
Description
technical field [0001] The invention belongs to the technical field of metallurgy. In particular, it relates to a preparation method and application of a 700MPa ultra-fine-grained high-strength weathering steel. Background technique [0002] Weathering steel is a low-alloy steel made by adding a certain amount of alloy elements to ordinary steel. The main alloy components are Cu, P, Cr, Ni and other elements. It has the characteristics of toughness, plastic extension, forming, welding and cutting, abrasion, high temperature, and fatigue resistance of high-quality steel; its weather resistance is 2 to 8 times that of ordinary carbon steel, and its paintability is 1.5 to 10 times that of ordinary carbon steel. At the same time, it has the characteristics of rust resistance, corrosion resistance and life extension of components, thinning and consumption reduction, labor saving and energy saving. Compared with other lightweight materials such as aluminum alloys and plastics, a...
Claims
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