A kind of steel for steel bar and its preparation method and steel bar
A technology for steel bars and billets, applied in the field of steel bars, can solve problems such as difficulty in meeting higher strength requirements
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[0040] As a third aspect of the present invention, there is provided a method for preparing steel for steel rods, wherein the steel for steel rods is the above-mentioned steel for steel rods provided by the present invention, and the preparation method includes:
[0041] Smelting the raw materials of the steel rods to obtain molten steel to be cast;
[0042] performing continuous casting on the molten steel to be cast to obtain a billet;
[0043] Carrying out full continuous rolling of the steel billet, wherein the starting rolling temperature is 1100°C to 1050°C, and the finishing rolling temperature is 950°C to 1000°C;
[0044] The rolled product is cooled.
[0045] The product obtained after cooling the rolled product can be sold directly or it can be further processed. The above preparation method is suitable for large-scale production in common iron and steel enterprises, and the product quality is easy to control.
[0046]During the continuous casting process, the cas...
Embodiment 1
[0055] In the present invention, a 110-ton oxygen top-bottom double-blown converter is used for smelting raw materials, and a 120-ton LF is used for refining. Steel for steel bar is prepared by the following method:
[0056] S1. Iron ore is smelted in a blast furnace to obtain molten iron in the blast furnace, and the weight of the molten iron in the blast furnace is 450 tons;
[0057] S2. Mix the blast furnace molten iron into the converter to obtain the initial molten steel, add ferroalloy to the ladle for alloying, and then perform LF refining on the alloyed molten steel, wherein 110 tons of oxygen top-bottom combined blowing converter is used for smelting Blast furnace molten steel and ferroalloys are smelted in a converter. The ferroalloys are ferrosilicon (FeSi75), ferromanganese (FeMn68C4.0), ferrochromium (FeCr50C1.0) and ferrovanadium (FeV50) (both have a purity of 99.7%), with a weight of 2000Kg, 3500Kg, 1500Kg, 220Kg; the rest is 102.78 tons of molten iron;
[005...
Embodiment 2
[0071] Other steps are with embodiment 1, difference is:
[0072] In step S2, the ferroalloys are ferrosilicon alloy (FeSi75), ferromanganese alloy (FeMn68C4.0), ferrochrome alloy (FeCr50C1.0) and ferrovanadium alloy (FeV50), with weights of 2100Kg, 3300Kg, 1460Kg and 220Kg respectively; the rest is 102.92 tons molten iron;
[0073] In step S5, the rolling start temperature is 1050°C, and the finish rolling temperature is 950°C; in step S6, the heating temperature is 900°C, and the holding time is 28min;
[0074] In step S7, the water cooling temperature is 50° C., and the duration is 30 minutes;
[0075] In step S8, the tempering temperature is 200° C., and the holding time is 100 minutes.
[0076] In step S9, the chemical composition and mass percentage of the round bar steel are: 0.20% C; 2.20% Mn; 1.50% Si; 0.68% Cr; 0.12% V; the balance is iron, wherein the mass ratio of Mn to Si is Mn:Si=1.47.
[0077] In step S10, the mechanical properties are:
[0078] Tensile str...
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Abstract
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