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A technology of steel billet and molten steel, applied in the field of preparation of 30MnSi billet, can solve the problems of low purity of molten steel, low comprehensive qualification rate, low production efficiency, etc., so as to improve the purity and pourability, improve the quality of casting billet, and avoid alloying. The effect of component segregation
Pending Publication Date: 2022-08-09
YANCHENG LIANXIN IRON & STEEL CO LTD
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[0004] The purpose of the present invention is to provide a kind of preparation method of 30MnSi steel slab, to solve the production efficiency of existing 30MnSi prestressed concrete steel bar mentioned in the above-mentioned background technology is lower, the purity of molten steel is lower, and cost is higher, comprehensive qualified low rate problem
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preparation example Construction
[0017] see figure 1 , the present invention provides an embodiment: a preparation method of a 30MnSi billet, the steps are:
[0018] Step 1: First add molten iron into the electric arc furnace, add scrap steel one after another at the beginning of smelting, add scrap steel in the middle of smelting, and smelt through 120t electric arc furnace of molten iron and scrap steel. stone as a slag-forming agent;
[0019] Step 2: Oxygen blowing smelting is carried out in an electric arc furnace, and the temperature is increased by electric arc in the later stage of smelting, and the tapping temperature at the smelting end is controlled at 1610 ° C ~ 1630 ° C, and the mass percentage of the molten steel composition at the smelting end is: C: 0.08% ~ 0.10%, S , P: ≤0.015%, according to the ratio of molten iron to scrap to determine the amount of oxygen blowing and electricity consumption;
[0020] Step 3: The molten steel at the end point of the electric arc furnace smelting is formed ...
example 1
[0027] Example 1: 30MnSi steel billet 165mm*165mm, mass percentage chemical composition: 0.29%C, 0.92%Si, 1.07%Mn, 0.022%P, 0.020%S, 0.02%Ni, 0.11%Cr, 0.08%Cu.
[0028] Low magnification structure of the billet: grade 0 for central crack, grade 0 for central looseness, grade 0.5 for intermediate crack, grade 0 for corner crack, grade 0 for subcutaneous crack, and grade 0 for non-metallic inclusions.
example 2
[0029] Example 2: 30MnSi steel billet 165mm*165mm, mass percentage chemical composition: 0.30%C, 0.90%Si, 1.17%Mn, 0.018%P, 0.021%S, 0.04%Ni, 0.10%Cr, 0.08%Cu.
[0030] Low magnification structure of the billet: grade 0 for central cracks, grade 0 for central looseness, grade 0 for intermediate cracks, grade 0 for corner cracks, grade 0 for subcutaneous cracks, and grade 0 for non-metallic inclusions.
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Abstract
The invention discloses a preparation method of a 30MnSi steel billet, which comprises the following steps: step 1, firstly adding molten iron into an electric arc furnace, successively adding waste steel at the beginning of smelting, adding the waste steel in the middle period of smelting, smelting in the 120t electric arc furnace through the molten iron and the waste steel, controlling the molten iron ratio to be 40-80%, and using quicklime and light-burned dolomite as slag formers; 2, oxygen blowing smelting is carried out in an electric arc furnace, the temperature is increased through an electric arc in the later period of smelting, the tapping temperature at the smelting end point is controlled to be 1610-1630 DEG C, molten steel at the smelting end point comprises, by mass, 0.08%-0.10% of C, smaller than or equal to 0.015% of S and smaller than or equal to 0.015% of P, the ratio of molten iron to scrap steel is adjusted according to the cost of the molten iron and the purchase price of the scrap steel, and a high-speed water flow cooling crystallizer is developed; and integrated technologies such as a large-capacity intermediate tank, a high liquid level, large-ladle and medium-ladle full-protection pouring, tundish automatic continuous temperature measurement, crystallizer cooling through high-speed water flow, crystallizer electromagnetic stirring, liquid level automatic control, continuous straightening, aerial fog uniform cooling and flame cutting are adopted, and the comprehensive qualified rate of casting blanks is increased.
Description
technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a preparation method of a 30MnSi steel billet. Background technique [0002] 30MnSi is mainly used for high-strength wires, coils, etc. It is generally used in prestressed pipe piles. It can be made into PC steel rods, which are mainly used in the construction industry and are the main steel in prestressed concrete pipe piles (mainly used for engineering foundations). The product quality is easy to guarantee and other advantages, it is widely used in the construction industry. 30MnSi prestressed concrete steel rod has the advantages of high strength, material saving and convenient use. It is mainly used for the pipe pile foundation of coastal and river construction projects and high-rise buildings, and is widely used. Low carbon, energy saving, environmental protection and low cost are the goals pursued by the iron and steel metallurgy industry. [0003] The ...
Claims
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Application Information
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