Steel plate for heavy-duty generator and manufacturing method thereof

A production method and generator technology, applied in the field of steel plate preparation, can solve the problems of unsatisfactory fast pace, high cost, and long construction period, and achieve the effect of internal compactness, high compactness, and short manufacturing cycle

Inactive Publication Date: 2012-07-18
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used steel plates for large-scale generators are S355J0 / Z35. This kind of large-thickness steel plates for large-scale generators currently mainly relies on forging production in China. The high cost and long construction period can no longer meet the fast-paced needs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The steel plate for large generators in this embodiment is smelted from the following components by weight percentage: C: 0.18%, Si: 0.28%, Mn: 1.15%, P: 0.012%, S: 0.003%, N: 0.005% , TAl (total aluminum): 0.030%, Nb: 0.025%, and the rest are Fe and unavoidable impurities. The steel plate thickness of this embodiment is 274mm.

[0029] The steps of the production method of steel plate for large generator of the present invention are as follows:

[0030] (1) Smelting: The molten steel is first smelted in an electric furnace. The weight of the molten steel is 100-110 tons, and then sent to the LF furnace for refining and adjusting the composition. Each element contains the following weight percentages: C: 0.18%, Si: 0.28%, Mn: 1.15% , P: 0.012%, S: 0.003%, N: 0.005%, TAl: 0.030%, Nb: 0.025%, when the temperature of molten steel reaches or exceeds 1565°C, transfer to a vacuum degassing furnace (VD furnace) for vacuum treatment, vacuum treatment Add Al wire 240m, CaSi bl...

Embodiment 2

[0040] The steel plate for large generators in this embodiment is smelted from the following components by weight percentage: C: 0.21%, Si: 0.35%, Mn: 1.10%, P: 0.010%, S: 0.003%, N: 0.006% , TAl (total aluminum): 0.050%, Nb: 0.020%, and the rest are Fe and unavoidable impurities. The thickness of the steel plate in this embodiment is 280 mm.

[0041] The steps of the production method of steel plate for large generator of the present invention are as follows:

[0042] (1) Smelting: The molten steel is smelted in an electric furnace first, and the weight of the molten steel is 100-110 tons, and then sent to the LF furnace for refining and adjusting the composition. Each element contains the following weight percentages: C: 0.21%, Si: 0.35%, Mn: 1.10% , P: 0.010%, S: 0.003%, N: 0.006%, TAl: 0.050%, Nb: 0.020%, when the temperature of molten steel reaches or exceeds 1575°C, transfer to a vacuum degassing furnace (VD furnace) for vacuum treatment, vacuum treatment Add Al wire 2...

Embodiment 3

[0052] The steel plate for large generators in this example is smelted from the following components by weight percentage: C: 0.16%, Si: 0.10%, Mn: 1.30%, P: 0.010%, S: 0.003%, N: 0.007% , TAl (total aluminum): 0.020%, Nb: 0.035%, and the rest are Fe and unavoidable impurities. The steel plate thickness of this embodiment is 278mm.

[0053] The steps of the production method of steel plate for large generator of the present invention are as follows:

[0054] (1) Smelting: The molten steel is smelted in an electric furnace first, and the weight of the molten steel is 100-110 tons, and then sent to the LF furnace for refining and adjusting the composition. Each element contains the following weight percentages: C: 0.16%, Si: 0.10%, Mn: 1.30% , P: 0.010%, S: 0.003%, N: 0.007%, TAl: 0.020%, Nb: 0.035%, when the temperature of molten steel reaches or exceeds 1555°C, transfer to vacuum degassing furnace (VD furnace) for vacuum treatment, vacuum treatment Add Al wire 240m, CaSi blo...

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Abstract

The invention discloses a steel plate for a heavy-duty generator. The steel plate is formed by smelting the following components according to weight percent: 0.18-0.21% of C, 0.10-0.30% of Si, 1.10-1.25% of Mn, less than or equal to 0.018% of P, less than or equal to 0.005% of S, less than or equal to 0.008% of N, 0.020-0.050% of TAL, 0.020-0.035% of Nb, less than or equal to 0.44% of Ceq, the balance of Fe and inevitable impurities. The delivery state of the invention is normalization. The steel plate for a 274-280mm heavy-duty generator which is milled instead of forged and produced by using the normalizing technique has a better toughness index after being fully stacked and grain refined. By using II type rolling control technique and rolling in two steps, the invention solves the problem that the size of the grain is uneven and the impact toughness is decreased and increases the thickness size of the producible steel plate.

Description

technical field [0001] The invention relates to a large generator steel plate and a preparation method of the steel plate. Background technique [0002] The thickness of steel plates for large-scale generators is 274-280mm, which are mainly used in the manufacture of generator components for hydropower units. It requires high internal quality, good lamellar tear resistance, and good welding performance for such steel plates to meet the requirements. Large-scale engineering needs. At present, the commonly used steel plates for large generators are S355J0 / Z35. At present, the large thickness steel plates for large generators mainly rely on forging production in China. The high cost and long construction period can no longer meet the fast-paced needs. Contents of the invention [0003] The object of the present invention is to provide a steel plate for large generators with large thickness, good compactness and lamellar tear resistance, and excellent cold working performance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C21C7/00C21D8/02B22D23/10
Inventor 韦明刘利香李红文赵文忠吕建会王全胜侯彩霞桑德广刘丹王飞何广霞
Owner WUYANG IRON & STEEL
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