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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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The produced Φ13mm wire rod can only produce 15.24mm strength 1860MPa grade steel strand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: furnace number 8B05482

[0024] Converter smelting, adding 180 tons of molten iron as raw material, 20.5 tons of pig iron for steelmaking, 4.6 tons of scrap steel, and working oxygen pressure of 7.5kg / cm for oxygen supply 2 , oxygen supply time is 13 minutes and 40 seconds; the amount of lime added is 7500kg, lightly burned dolomite is 1665kg; Austrian ore is 1765kg; end carbon: 0.40%, phosphorus: 0.015%; tapping temperature is 1610℃.

[0025] Deoxidation alloying, silicon calcium barium 300kg, silicon manganese 1000kg, ferromanganese 1000kg, carbon ferrochrome 970kg.

[0026] For LF refining furnace, the flow rate of argon gas in the early stage is 500NL / min, the flow rate in the middle stage is 340NL / min, the flow rate of argon gas in the later stage is 100NL / min, the synthetic slag is added 650kg, the submerged arc slag is 320kg, and the outbound oxygen activity is 6.2ppm.

[0027] The tundish temperature is 1485°C, the crystallizer water volume is 165...

Embodiment 2

[0031] Embodiment 2: furnace number 8A04946

[0032] Converter smelting, adding 184 tons of molten iron as raw material, 20.3 tons of pig iron for steelmaking, 5 tons of scrap steel, and working oxygen pressure of 7.6kg / cm for oxygen supply 2 , The oxygen supply time is 12 minutes and 33 seconds. The amount of lime added is 13900kg, lightly burned dolomite is 260kg; Austrian ore is 4.6kg; endpoint carbon: 0.58%, phosphorus: 0.015%; tapping temperature is 1590°C.

[0033] Deoxidation alloying, silicon calcium barium 350kg, silicon manganese 89kg, ferromanganese 1100kg, carbon ferrochrome 1000kg.

[0034] For LF refining furnace, the flow rate of argon gas in the early stage is 490NL / min, the flow rate in the middle stage is 330NL / min, the flow rate of argon gas in the later stage is 30NL / min, the synthetic slag is added 600kg, the submerged arc slag is 300kg, and the outbound oxygen activity is 9ppm.

[0035] The tundish temperature is 1480°C, the crystallizer water volume is...

Embodiment 3

[0039] Embodiment 3: furnace number 8B05478

[0040] Converter smelting, adding 176 tons of molten iron as raw material, 15.3 tons of pig iron for steelmaking, 20.6 tons of scrap steel, and working oxygen pressure of 7kg / cm for oxygen supply 2 , The oxygen supply time is 12 minutes and 23 seconds. The amount of lime added is 12600kg, lightly burned dolomite is 330kg; Austrian ore is 3070kg; end point carbon: 0.57%, phosphorus: 0.01%; tapping temperature is 1600°C.

[0041] Deoxidation alloying, silicon calcium barium 330kg, silicon manganese 920kg, ferromanganese 1550kg, carbon ferrochrome 1000kg.

[0042] For LF refining furnace, the flow rate of argon gas in the early stage is 520NL / min, the flow rate in the middle stage is 330NL / min, the flow rate of argon gas in the later stage is 90NL / min, the synthetic slag is added 600kg, the submerged arc slag is 300kg, and the outbound oxygen activity is 6.8ppm.

[0043] The tundish temperature is 1479°C, the crystallizer water volu...

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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%.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled wire rods, and in particular relates to a hot-rolled wire rod of Nb-containing microalloyed high-carbon steel and a manufacturing method, which is suitable for producing Φ18.9mm and Φ21.6mm steel strands with a strength of 1860MPa and Φ8 Φ13-16mm hot-rolled high-carbon steel wire rod for ~11mm smooth steel wire. Background technique [0002] Prestressed steel strands are widely used in the construction of infrastructure such as mines, coal mines, deep-water wharves, expressways, high-speed railways, high-rise buildings, airports, etc. Using steel strands instead of ordinary steel bars can increase the span of buildings, improve service life, Reduce project cost. Therefore, the promotion and application of this product in China has been very rapid in recent years. In 2000, the domestic consumption of this product was 100,000 tons, and the current demand has reached 2.5 million tons. At the sa...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/26C21C5/30C21C7/076C21C7/10B22D11/18B22D11/22C21D8/06
CPCY02P10/20
Inventor 王全礼周德李永东孔祥涛张永青叶少锋朱殷翔李三凯程四华丁宁孙齐松史昌
Owner SHOUGANG CORPORATION
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