Weather-resistant steel and preparing method thereof
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A technology for weathering steel and billet, applied in metal rolling and other directions, can solve the problems of increasing the cost and difficulty of smelting and the influence of steel forming properties, and achieve the effect of suitable promotion and use, reducing the difficulty of smelting, reducing the cost and
Inactive Publication Date: 2019-12-10
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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The Cr content in the weathering steel is high. Although the weathering performance of the steel is improved, the high content of Cr increases the cost and difficulty of smelting, and also adversely affects the formability of the steel.
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preparation example Construction
[0024] The present invention also provides a method for preparing the above-mentioned weathering steel, comprising the following steps:
[0025] a. Melt steel is smelted into steel slabs; the composition of molten steel is: by weight percentage, C: 0.06-0.08%, Si: 0.30-0.45%, Mn: 1.10-1.25%, P≤0.020%, S≤0.005%, Cu: 0.20~0.30%, Cr: 0.50~0.60%, Ni: 0.20~0.30%, Nb: 0.020~0.030%, Sb: 0.03~0.05%, Al: 018~0.20%, the balance is Fe and unavoidable impurities;
[0026] b. Hot rolling the steel slab smelted in step a. The temperature before hot rolling is 1220-1260°C. Rough rolling is carried out in 5 passes, the deformation of each pass is ≥ 20%, the whole length is descaled, and finally The rolling temperature is 840~880℃;
[0027] c. Pre-cooling after hot rolling;
[0028] d. The cooled steel is coiled, and the coiling temperature is 560-600° C., and the weather-resistant steel is obtained after coiling.
[0029] Wherein, in the above-mentioned preparation method of weathering st...
Embodiment 1～3
[0034] Embodiment 1~3 prepares weathering steel of the present invention
[0035] The specific operation steps are as follows:
[0036] a, by the composition shown in table 1, molten steel is smelted into billet;
[0037] b. Hot rolling the steel slab smelted in step a. The temperature before hot rolling is 1220°C. Rough rolling is carried out in 5 passes. The deformation of each pass is ≥ 20%. The whole length is descaled. The rolling temperature is 850~880℃;
[0038] c. Sparse cooling after hot rolling;
[0039] d. The cooled steel is coiled at a temperature of 600° C. to obtain weathering steel.
[0040] Comparative example 1, 2 prepares the weathering steel of existing composition
[0041] The weather-resistant steel with high Cr content was selected as Comparative Example 1, and the weather-resistant steel with high Sb content was selected as Comparative Example 2. The specific components are shown in Table 1 below. In Comparative Examples 1 and 2, the smelting and r...
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Abstract
The invention belongs to the field of ferrous metallurgy and particularly relates to weather-resistant steel and a preparing method thereof. For existing market demands, the weather-resistant steel low in cost and high in quality and the preparing method of the weather-resistant steel are developed. Chemical components of the weather-resistant steel include, by weight, 0.06-0.08% of C, 0.30-0.45%of Si, 1.10-1.25% of Mn, equal to or smaller than 0.020% of P, equal to or smaller than 0.005% of S, 0.20-0.30% of Cu, 0.50-0.60% of Cr, 0.20-0.30% of Ni, 0.020-0.030% of Nb, 0.03-0.05% of Sb, 0.18-0.20% of Al and the balance Fe and inevitable impurities. The preparing method of the weather-resistant steel comprises the steps of smelting, hot rolling, laminar cooling and reeling. The novel elementSb is introduced into the weather-resistant steel, the synergistic effect of the element Sb and the element Al is used for ensuring that the weather-resistant steel has good weather-resistant performance, the weather-resistant performance comparative to that of an S450AW grade can be achieved, and the strength of the weather-resistant steel is high and can reach 450 MPa or above. The content of high-cost alloy elements such as Cr is reduced, cost is reduced, the smelting difficulty is lowered, and the weather-resistant steel and the preparing method thereof are suitable for utilization and popularization.
Description
technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a weathering steel and a preparation method thereof. Background technique [0002] The harm of steel corrosion to various fields of national economy and national defense construction is a common and serious problem. Among them, atmospheric corrosion is the main form of steel structure corrosion, accounting for about half of all corrosion losses. Therefore, it is of great significance to the research and development of weathering steel. Weathering steel, also known as atmospheric corrosion-resistant steel, is widely used in construction, vehicles, containers, bridges and other fields. It is a type of low-alloy steel with good corrosion resistance in the atmosphere, and its C content is less than 0.2wt.%. Cu, Cr, Ni, P, Si, Mn, etc. are used as main alloying elements. Through a lot of research at home and abroad, it is now generally believed that after long-t...
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