Nb-containing micro-alloyed high-carbon steel hot-rolled wire rod and manufacturing method thereof

A technology of hot-rolled wire rod and micro-alloying, which is applied in the field of hot-rolled high-carbon steel wire rod, Nb-containing micro-alloyed high-carbon steel hot-rolled wire rod and manufacturing field, and achieves the effects of good use, good quality and remarkable benefits.

Inactive Publication Date: 2013-01-02
SHOUGANG CORPORATION
4 Cites 26 Cited by

AI-Extracted Technical Summary

Problems solved by technology

The produced Φ13mm wire rod can only produce...
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Abstract

The invention comprises an Nb-containing micro-alloyed high-carbon steel hot-rolled wire rod and a manufacturing method thereof. The invention belongs to the technical field of hot-rolled wire rods. The hot-rolled wire rod comprises the components of, by mass: 0.83-1.00% of C, 0.15-0.35% of Si, 0.6-0.9% of Mn, 0-0.50% of Cr, 0-0.15% of V, 0.01-0.20% of Nb, and balance of Fe. A converter is adopted; a double slag method is adopted; and high tensile carbon operation is adopted. Slag is blocked, and molten steel is tapped. Recarburization is carried out by using a low-nitrogen recarburizer. When steel is fetched from an LF refining station, an oxygen activity is controlled below 10ppm. In a refining final slag, a total amount of FeO and MnO is no higher than 3%. An inclusion modification treatment is carried out on a Ca-Si line. 160mm*160mm small billets are adopted. Terminal electromagnetic stirring is adopted in cooperation of a crystallizer. Full-protection and constant-pulling-speed casting is carried out by using a continuous casting machine. A reasonable secondary cooling system is adopted. An appropriate open rolling temperature is controlled, such that shrinkage cavity welding probability is increased. Pre-water-cooling and phase-transformation-strengthening cooling technology are applied for controlling tissue and performance. After aging, mechanical property tensile strength of the wire rod is higher than 1280MPa, and an area reduction is greater than 30%.

Application Domain

Technology Topic

Examples

  • Experimental program(4)

Example Embodiment

[0023] Example 1: Heat No. 8B05482
[0024] Converter smelting, raw material molten iron is added 180 tons, steel pig iron is 20.5 tons, scrap steel is 4.6 tons, and oxygen pressure is 7.5kg/cm 2 , The oxygen supply time is 13 minutes and 40 seconds; the amount of lime added is 7500kg, the lightly burned dolomite is 1665kg; the austenitic ore is 1765kg; the final carbon: 0.40%, phosphorus: 0.015%; the tapping temperature is 1610℃.
[0025] Deoxidation and alloying, silicon calcium barium 300kg, silicon manganese 1000kg, ferromanganese 1000kg, carbon ferrochromium 970kg.
[0026] In the LF refining furnace, the argon flow rate is 500NL/min in the early stage, 340NL/min in the middle stage, and 100NL/min in the later stage. The synthetic slag is added 650kg, the submerged arc slag is 320kg, and the out-station oxygen activity is 6.2ppm.
[0027] The tundish temperature is 1485℃, the water volume of the crystallizer is 1650 L/min, and the pulling speed is 1.85/min.
[0028] Start rolling temperature: 1090℃, finishing rolling temperature: 950℃, spinning temperature: 890℃.
[0029] Finished product composition: C: 0.83%; Si: 0.18%; Mn: 0.65%; S: 0.006%; P: 0.012%; Cr: 0.29%; V: 0.07%; Nb: 0.01%.
[0030] Tensile strength of wire rod: 1290MPa, area shrinkage rate of 36.5%.

Example Embodiment

[0031] Example 2: Heat No. 8A04946
[0032] Converter smelting, raw material molten iron is added 184 tons, steelmaking pig iron is 20.3 tons, scrap steel is 5 tons, and the oxygen pressure is 7.6kg/cm 2 , The oxygen supply time is 12 minutes and 33 seconds. The amount of lime added is 13900kg, light-burned dolomite is 260kg; Ores is 4.6kg; end carbon: 0.58%, phosphorus: 0.015%; tapping temperature is 1590℃.
[0033] Deoxidation and alloying, 350kg of silicon, calcium and barium, 89kg of silicon and manganese, 1100kg of ferromanganese, and 1000kg of carbon ferrochromium.
[0034] The LF refining furnace has an argon flow rate of 490NL/min in the early stage, 330NL/min in the middle stage, 30NL/min in the later stage, 600kg of synthetic slag added, 300kg of submerged arc slag, and an out-station oxygen activity of 9ppm.
[0035] The temperature of the tundish is 1480℃, the water volume of the crystallizer is 1659 L/min, and the pulling speed is 1.85/min.
[0036] Start rolling temperature: 1070℃, finish rolling temperature: 937℃, spinning temperature: 866℃.
[0037] Finished product composition: C: 0.87%; Si: 0.25%; Mn: 0.75%; S: 0.009%; P: 0.015%; Cr: 0.30%; V: 0.08%; Nb: 0.02%.
[0038] Tensile strength of wire rod: 1310MPa, area shrinkage rate of 38.7%.

Example Embodiment

[0039] Example 3: Heat No. 8B05478
[0040] Converter smelting, raw material molten iron is added 176 tons, steel-making pig iron 15.3 tons, scrap steel 20.6 tons, oxygen supply operating oxygen pressure 7kg/cm 2 , Oxygen supply time is 12 minutes and 23 seconds. The amount of lime added is 12600kg, light burnt dolomite is 330kg; the austenitic ore is 3070kg; the final carbon: 0.57%, phosphorus: 0.01%; the tapping temperature is 1600°C.
[0041] Deoxidation alloying, silicon calcium barium 330kg, silicon manganese 920kg, ferromanganese 1550kg, carbon ferrochrome 1000kg.
[0042] The LF refining furnace has an argon flow rate of 520NL/min in the early stage, 330NL/min in the middle stage, and 90NL/min in the later stage. The synthetic slag is added to 600kg, the submerged arc slag is 300kg, and the out-station oxygen activity is 6.8ppm.
[0043] The temperature of the tundish is 1479℃, the water volume of the crystallizer is 1655 L/min, and the pulling speed is 1.85/min.
[0044] Start rolling temperature: 1090℃, finish rolling temperature: 945℃, spinning temperature: 889℃.
[0045] Finished product composition: C: 0.95%; Si: 0.22%; Mn: 0.85%; S: 0.004%; P: 0.010%; Cr: 0.32%; V: 0.05%; Nb: 0.05%.
[0046] Wire rod tensile strength: 1340MPa, surface shrinkage 34.5%.
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PUM

PropertyMeasurementUnit
Tensile strength1290.0MPa
Tensile strength1310.0MPa
Tensile strength1340.0MPa
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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