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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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 t...

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 temperatu...

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 ...

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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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