A smelting method for producing boron-containing high-toughness h-beam steel by blowing argon from a ladle
A smelting method and H-beam technology, applied in the field of iron and steel metallurgy, can solve the problems of high cost and high production cost of LF refining, and achieve the effect of good low temperature impact performance
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Embodiment 1
[0048] According to the above-mentioned smelting method, a 50t steel ladle is used based on the tapping amount of 50t steel per furnace.
[0049] 1. The chemical composition of steel is shown in Table 1
[0050] Table 1
[0051]
[0052] The balance is iron and trace impurities.
[0053] 2. Use 50t ladle for smelting
[0054] Before the converter is tapped, 150kg of fully pre-melted synthetic slag is first added to the bottom of the ladle, and the composition of the synthetic slag is SiO 2 : 2.19wt%, CaO: 60.48wt%, MgO: 10wt%, Al 2 o 3 : 11.15wt%, CaF 2: 14.86wt%, moisture + ash: 1.32%. During the tapping process, 50kg of pre-melted slag is added along with the steel flow;
[0055] Add silicon calcium barium 2.0kg / t steel to deoxidize the steel, and use silicon manganese and medium carbon ferromanganese for alloying;
[0056] 3. Use the manual argon blowing mode, feed the aluminum wire 15m after the argon blowing starts, and feed the wire at a speed of 3.0m / s; then ...
Embodiment 2
[0062] 1. The chemical composition of the steel is shown in Table 3
[0063] table 3
[0064]
[0065] The balance is iron and trace impurities.
[0066] 2. Use 50t steel ladle
[0067] Before the converter is tapped, 100kg of synthetic slag is first added to the bottom of the ladle. The composition of the synthetic slag is CaO: 69.68wt%, MgO: 7.94wt%, Al 2 o 3 : 10.00wt%, CaF 2 : 10.06wt%, moisture + ash: 2.32%. During the tapping process, 100kg of pre-melted slag is added along with the steel flow. Add silicon calcium barium 2.0kg / t steel, use silicon manganese, medium carbon ferromanganese for alloying.
[0068] 3. Use the manual argon blowing mode, feed the aluminum wire 30m after the argon blowing starts, and feed the wire at a speed of 4m / s; then add boron after stirring for 2 minutes at a large argon flow rate of 200L / min, and add boron at a flow rate of 120L / min Stir and feed boron-iron wire 15m with medium argon flow rate, feed wire speed 5m / s, stir and feed...
Embodiment 3
[0074] 1. The chemical composition of the steel is shown in Table 5
[0075] table 5
[0076]
[0077] The balance is iron and trace impurities.
[0078] 2. Use 50t steel ladle
[0079] Before the converter is tapped, 125kg of fully pre-melted synthetic slag is first added to the bottom of the ladle, and the composition of the synthetic slag is SiO 2 : 4.98wt%, CaO: 61.91wt%, MgO: 5.11wt%, Al 2 o 3 : 15.00wt%, CaF 2 : 10.00wt%, moisture + ash: 3%. During the tapping process, 75kg of pre-melted slag is added along with the steel flow. Add silicon calcium barium 2.0kg / t steel to deoxidize the steel, and use silicon manganese and medium carbon ferromanganese for alloying.
[0080] 3. Use the manual argon blowing mode, feed the aluminum wire 22m after the argon blowing starts, and feed the wire at a speed of 3.0m / s; then stir with a large argon flow rate of 280L / min for 1.5min and then add boron, with a flow rate of 100L / min Stir and feed the iron-boron wire 18m at a me...
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