A kind of low-temperature-resistant hot-rolled H-shaped steel and its preparation method
An H-beam, low-temperature-resistant technology, applied in the field of low-temperature-resistant hot-rolled H-beam and its preparation, can solve the problems of not too high strength level, low low temperature toughness, and insufficient use of V, and achieve excellent strength and toughness matching and The effect of low temperature resistance, low production cost and stable alloy recovery rate
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Embodiment 1
[0047] Embodiment 1: according to the chemical composition requirement of steel in the present invention, the chemical composition obtained is shown in Table 1:
[0048] Table 1 Chemical composition of the steel in Example 1 (wt.%)
[0049]
[0050] End point of converter smelting [S]: 0.020%, [P]: 0.010%. The slag is blocked and the steel is tapped, and the thickness of the slag layer in the bag is 50mm. Add Al-Mn-Fe 4kg / t steel when placing steel. Add metal manganese, ferrosilicon, vanadium nitrogen for alloying.
[0051] Ladle into the station to add lime 8kg / t steel. Calcium carbide 2.5kg / t steel, aluminum particles, silicon calcium barium 3.0kg / t steel for slagging deoxidation. The basicity of refining process slag and final slag is 2.5. After taking the initial sample, fix the oxygen at 19ppm, feed the titanium wire 90m, and feed the wire speed ≥ 3m / s. The refining time is 31 minutes. Feed 150m of solid core calcium wire for calcification before soft blowing, a...
Embodiment 2
[0061] Embodiment 2: According to the chemical composition requirement of steel in the present invention, the chemical composition obtained is shown in Table 3:
[0062] Table 3 Chemical composition (wt.%) of the steel of Example 2
[0063]
[0064] End point of converter smelting [S]: 0.0:15%, [P]: 0.012%. The slag is blocked and the steel is tapped, and the thickness of the slag layer in the bag is 70mm. The amount of aluminum-manganese ferro-manganese added is 2.5kg / t steel when putting steel. Add metal manganese, ferrosilicon, vanadium nitrogen for alloying.
[0065] Ladle into the station to add lime 12kg / t steel. Calcium carbide 1.5kg / t steel, aluminum particles, silicon calcium barium 2.0kg / t steel for slagging deoxidation. The basicity of refining process slag and final slag is 3.0. After taking the initial sample, fix the oxygen at 15ppm, feed the titanium wire 80m, and feed the wire speed ≥ 3m / s. The refining time is 31 minutes. Before soft blowing, feed so...
Embodiment 3
[0070] Embodiment 3: According to the chemical composition requirement of steel in the present invention, the chemical composition obtained is shown in Table 5:
[0071] Table 5 The chemical composition (wt.%) of the steel of Example 3
[0072]
[0073] End point of converter smelting [S]: 0.016%, [P]: 0.010%. The slag is blocked and the steel is tapped, and the thickness of the slag layer in the bag is 60mm. The amount of Al-Mn ferro-manganese to be added is 3.5kg / t of steel. Add metal manganese, ferrosilicon and ferrovanadium for alloying.
[0074] Ladle into the station to add lime 10kg / t steel. Calcium carbide 2.0kg / t steel, aluminum particles, silicon calcium barium 2.5kg / t steel for slagging deoxidation. The basicity of refining process slag and final slag is 2.1. After taking the initial sample, fix the oxygen at 9ppm, then feed the titanium wire 60m, and the feeding speed is ≥3m / s. The refining time is 31 minutes. Before soft blowing, 120m of solid core calci...
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