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Ultra-low carbon and nitrogen steel and preparing method

A technology of ultra-low carbon nitrogen steel and carbon nitrogen steel, which is applied in the field of ultra-low carbon nitrogen steel and its preparation, can solve the problems of poor denitrification ability of GOR, unstable nitrogen content control, large consumption of argon gas, etc., and achieve product performance The effect of high quality, shortened smelting time and low cost

Active Publication Date: 2016-08-31
四川罡宸不锈钢有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For denitrification, due to the large consumption of argon gas in GOR converter denitrification and the large fluctuation range, for example, the consumption of argon gas is about 10-14Nm3 / t steel, with an average of 12.5Nm3 / t steel, and the finished nitrogen is 0.45-0.055%, the lowest It is about 0.045%, which shows that the current GOR denitrification ability is poor and the nitrogen content control is unstable. Even if a large amount of argon is used (GOR blows argon throughout), it is still unable to ensure that the nitrogen content in the steel reaches a low level.

Method used

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  • Ultra-low carbon and nitrogen steel and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] An ultra-low carbon nitrogen steel, based on the total amount of ultra-low carbon nitrogen steel, C≤0.030, Si≤0.75, Mn≤2.00, P≤0.045, S≤0.030, Cr 18.00-20.00, Ni 8.00-12.00, N≤ 0.10, the rest is Fe, and the measurement unit is wt%.

[0037] The specific preparation method is as follows:

[0038] (1) Preparation of ingredients: preparation of raw materials required for smelting; Si≤0.180, alkalinity 1.45±0.3, converter cold material ratio of 10±3%;

[0039] (2) Intermediate frequency furnace or / and electric furnace smelting: temperature after slag removal ≥ 1520°C; C: 3.5~4.0%; Cr: range ±0.8% according to batching requirements; Ni: range according to batching requirements ±0.3%; Si: furnace GOR Blow 300 Sampling after oxygen is 0.20~0.50%, GOR sampling without oxygen blowing is 0.50~0.70%; furnace is 0.30~0.60%; S≤0.100%.

[0040] (3) GOR refining furnace: After the blast furnace molten iron is desulfurized, desiliconized and dephosphorized, it is blended into the GO...

Embodiment 2

[0052] An ultra-low carbon nitrogen steel, based on the total amount of ultra-low carbon nitrogen steel, C: 0.015-028, Si 0.4-0.75, Mn 1-1.3, P≤0.045, S≤0.005, Cr 18.00-18.40, Ni 8.00- 8.1, N 0-0.05, the rest is Fe, and the measurement unit is weight %.

[0053] The specific preparation method is as follows:

[0054] (1) Preparation of ingredients: preparation of raw materials required for smelting; Si≤0.180, alkalinity 1.45±0.3, converter cold material ratio of 10±3%;

[0055] (2) Intermediate frequency furnace or / and electric furnace smelting: temperature after slag removal ≥ 1520°C; C: 3.5~4.0%; Cr: range ±0.8% according to batching requirements; Ni: range according to batching requirements ±0.3%; Si: furnace GOR Blow 300 Sampling after oxygen is 0.20~0.50%, GOR sampling without oxygen blowing is 0.50~0.70%; furnace is 0.30~0.60%; S≤0.100%.

[0056] (3) GOR refining furnace: After the blast furnace molten iron is desulfurized, desiliconized and dephosphorized, it is ble...

Embodiment 3

[0069] An ultra-low carbon nitrogen steel, based on the total amount of ultra-low carbon nitrogen steel, C: 0.015, N: 0, Si≤0.75, Mn≤2.00, P≤0.045, S≤0.030, Cr 18.00-20.00, Ni 8.00- 12.00, the rest is Fe, and the measurement unit is wt%.

[0070] The C: 0.015-028, Si 0.4-0.75, Mn 1-1.3, P≤0.045, S≤0.005, Cr 18.00-18.40, Ni 8.00-8.1, N 0-0.05, the rest is Fe, and the measurement unit is weight % .

[0071] The specific preparation method is as in Example 2, and the difference is that in step (3) the first stage oxidation temperature in the GOR refining furnace is ≥1720°C, and the amount of argon blowing is ≥1000 .

[0072] The following test content is a round of ultra-low carbon tests in August, September, October and November respectively. The main purpose of the first three rounds of tests is to develop the ultra-low carbon smelting process for GOR production. Through the results of the first three rounds of tests, the GOR production ultra-low carbon smelting process can...

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Abstract

The invention belongs to the technical field of steel and iron materials, and particularly relates to ultra-low carbon and nitrogen steel and a preparing method. The preparing method is characterized in that according to the total quantity, the ultra-low carbon and nitrogen steel comprises, by weight percent, not larger than 0.030% of C, not larger than 0.75% of Si, not larger than 2.00% of Mn, not larger than 0.045% of P, not larger than 0.030% of S, 18.00% to 20.00% of Cr, 8.00% to 12.00% of Ni, not larger than 0.10% of N and the balance of Fe. The content of carbon and nitrogen in the steel is low, the method is simple, operation is easy, the cost is low, the product performance quality is high, the decarburization speed is improved, and the smelting time is shortened.

Description

technical field [0001] The invention belongs to the technical field of iron and steel materials, and in particular relates to an ultra-low carbon nitrogen steel and a preparation method thereof. Background technique [0002] In the two-step smelting process of stainless steel, AOD is used by many manufacturers as an argon-oxygen decarburization furnace. The blowing method of AOD is carried out by blowing a mixture of argon and oxygen on the side of the furnace. Therefore, the way and intensity of side blowing not only have an important impact on the physical and chemical phenomena in the molten pool, but also directly affect the life and production of the furnace lining. cost. [0003] The GOR gas-oxygen smelting technology from the Commonwealth of Independent States has been used in the construction of new plants and the renovation of old plants in Russia, Ukraine and other countries after more than ten years of exploration. Its advantage is that it has a wide choice of fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/40C22C38/02C22C38/04C22C33/04C21C7/10C21C5/34
CPCC21C5/34C21C7/10C22C33/04C22C38/001C22C38/02C22C38/04C22C38/40C22C38/58
Inventor 李六一向阳李渔肖猷斌王学平张建国
Owner 四川罡宸不锈钢有限责任公司