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Micro alloying SWRH87B 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 wire rod to achieve the effect of remarkable benefit, good quality and good use.

Inactive Publication Date: 2009-12-09
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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  • Micro alloying SWRH87B hot rolled wire rod and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: furnace number 8B05481

[0033] Converter smelting, adding 179 tons of molten iron as raw material, 20.2 tons of pig iron for steelmaking, 4.5 tons of scrap steel, and working oxygen pressure of 7kg / cm for oxygen supply 2 , oxygen supply time 13 minutes and 35 seconds; lime addition 7900kg, light burnt dolomite 1664kg; Austrian ore 1761kg; endpoint carbon: 0.45%, phosphorus: 0.013%; tapping temperature 1613°C.

[0034] Deoxidation alloying, silicon calcium barium 300kg, silicon manganese 880kg, ferromanganese 1000kg, carbon ferrochrome 950kg.

[0035] For LF refining furnace, the flow rate of argon gas in the early stage is 510NL / min, the flow rate in the middle stage is 300NL / min, the flow rate of argon gas in the later stage is 100NL / min, the synthetic slag is added 600kg, the submerged arc slag is 300kg, and the outbound oxygen activity is 5.7ppm.

[0036] The tundish temperature is 1485°C, the crystallizer water volume is 1657L / min, and the casting sp...

Embodiment 2

[0038] Embodiment 2: furnace number 8A04945

[0039] Converter smelting, adding 117 tons of molten iron as raw material, 20.9 tons of pig iron for steelmaking, 4.7 tons of scrap steel, and working oxygen pressure of 7.5kg / cm for oxygen supply 2 , The oxygen supply time is 11 minutes and 33 seconds. The amount of lime added is 13980kg, lightly burned dolomite is 240kg; Austrian ore is 4.28kg; endpoint carbon: 0.52%, phosphorus: 0.013%; tapping temperature is 1590°C.

[0040] Deoxidation alloying, silicon calcium barium 300kg, silicon manganese 900kg, ferromanganese 1000kg, carbon ferrochrome 1000kg.

[0041] 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.

[0042] The tundish temperature is 1480°C, the crystallizer water volum...

Embodiment 3

[0044] Embodiment 3: furnace number 8B05468

[0045] 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; endpoint carbon: 0.57%, phosphorus: 0.01%; tapping temperature is 1600°C.

[0046] Deoxidation alloying, silicon calcium barium 330kg, silicon manganese 920kg, ferromanganese 1550kg, carbon ferrochrome 1000kg.

[0047] 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 12ppm.

[0048] The tundish temperature is 1479°C, the crystallizer water volume...

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Abstract

The invention provides a micro alloying SWRH87B hot rolled wire rod and a manufacturing method thereof, belonging to the technical field of hot rolled wire rod. In the invention, Cr and V micro alloying are adopted; double slag process high drawing carbon operation is used in a converter; end-point carbon is controlled at 0.40-0.60%, the steel tapping temperature is 1580-1620 DEG C, and the slag-blocked tapping is used; low nitrogen carburant is used for recarburization; Si-Ca-Ba is used for deoxidation; 600-800kg synthetic slag is added into each converter; oxygen activity is controlled below 10ppm by entering into an LF refining station, and the refined finishing slag sum of FeO and MnO is no more than 3%; inclusion modification treatment is carried out on the Ca-Si line; a billet in the size of 160mm*160mm is used, a casting mould is used for coordinating with final electromagnetic stirring (F-EMS); continuous casting machine whole protection, constant drawing speed casting and proper secondary cooling system are adopted; the initial rolling temperature is controlled at 1020-1150 DEG C which is conductive to welding the drawholes and increasing the probability of the drawholes welding; the water pre-cooling and phase transformation strengthening cooling technology is used to control the texture and the performance. The invention has the advantages that the aging time of the wire rod before the follow-up processing is shortened, the tensile strength thereof after aging time is larger than 1280MPa, and the area reduction rate is larger than 25%.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled wire rods, in particular to a microalloyed SWRH87B (High CarbonSteel Wire Rods 87B) hot-rolled wire rod and its manufacturing method, which is suitable for producing Φ18.9 and Φ21.6mm steel strands with a strength of 1860 MPa Wire and Φ8~11mm smooth steel wire use Φ13~16mm hot-rolled SWRH87B wire rod. 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 same time, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/12C22C38/18C22C38/24C21C5/28C21C7/06C21C7/076B22D11/115B22D11/18B21B37/74
CPCY02P10/20
Inventor 周德王全礼李永东陈明跃孔祥涛孙佳兰代旺喻黄海王莉张宝全黄细阳叶绍锋孙齐松丁宁李三凯赵福林郑权
Owner SHOUGANG CORPORATION
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