Steel plate for guide blades of large hydropower generating units and production method thereof

A technology for hydroelectric units and production methods, which is applied in the field of steel plates for guide vanes of large hydroelectric units, can solve the problems of long construction period and high cost, and achieve the effects of good strength and toughness matching, compact internal quality, and high purity

Inactive Publication Date: 2011-01-19
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 guide vanes of large-scale hydropower units use 20MnSi. At present, this steel plate mainly relies on forging production in China. The cost is high and the construction period is long, which can no longer meet the fast-paced needs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The steel plate for guide vanes of large hydropower units in this embodiment is smelted from the following components by weight percentage: C: 0.18%, Si: 0.65%, Mn: 1.30%, P: 0.012%, S: 0.003%, Alt ( Total aluminum): 0.020%, Cu: 0.12%, the rest is Fe and unavoidable impurities. The thickness of the steel plate in this embodiment is 202 mm.

[0030] The steps of the production method of steel plate for guide vane of large hydroelectric unit of the present invention are as follows:

[0031] (1) Smelting: The molten steel is smelted in an electric furnace first, and the molten steel in the furnace 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: 0.65%, Mn: 1.30% , P: 0.012%, S: 0.003%, Alt: 0.020%, Cu: 0.12%, when the temperature of molten steel reaches 1565°C, transfer to vacuum degassing furnace (VD furnace) for vacuum treatment; add Al wire 230m, CaSi block...

Embodiment 2

[0043] The steel plate for guide vanes of large hydropower units in this embodiment is smelted from the following components by weight percentage: C: 0.16%, Si: 0.60%, Mn: 1.25%, P: 0.010%, S: 0.003%, Alt ( Total aluminum): 0.028%, the rest is Fe and unavoidable impurities. The thickness of the steel plate in this embodiment is 226mm.

[0044] Large-scale hydroelectric unit guide vane of the present invention is as follows with the production method of rolling substituting forged steel plate with large thickness:

[0045] (1) Smelting: The molten steel is smelted in an electric furnace first, and the molten steel in the furnace 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: 0.60%, Mn: 1.25% , P: 0.010%, S: 0.003%, Alt: 0.028%, when the temperature of molten steel reaches 1560 ℃, transfer to vacuum degassing furnace (VD furnace) for vacuum treatment; add 260m of ...

Embodiment 3

[0057] The steel plate for guide vanes of large hydropower units in this embodiment is smelted from the following components by weight percentage: C: 0.21%, Si: 0.80%, Mn: 1.10%, P: 0.014%, S: 0.003%, Alt ( Total aluminum): 0.050%, Cu: 0.15%, the rest is Fe and unavoidable impurities. The thickness of the steel plate in this embodiment is 216 mm.

[0058] Large-scale hydroelectric unit guide vane of the present invention is as follows with the production method of rolling substituting forged steel plate with large thickness:

[0059] (1) Smelting: The molten steel is smelted in an electric furnace first, and the molten steel in the furnace 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: 0.80%, Mn: 1.10% , P: 0.014%, S: 0.003%, Alt: 0.050%, Cu: 0.15%, when the temperature of molten steel reaches 1580 ° C, transfer to vacuum degassing furnace (VD furnace) for vacuu...

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Abstract

The invention discloses a steel plate for guide blades of large hydropower generating units, which is smelted by the following components by weight: 0.18-0.21% of C, 0.60-0.80% of Si, 1.10-1.25% of Mn, not more than 0.020% of P, not more than 0.005% of S, not more than 0.15% of Cu, 0.020-0.050% of Alt and the balance Fe and inevitable impurities. The steel plate has the following advantages: (1) the steel plate has good strength and toughness matching, yield strength not less than 275MPa, Rm not less than 490MPa, 0-DEG C longitudinal impact energy not less than 27J, A50 not less than 14%, psi not less than 30% and HB not less than 145; (2) the steel plate is purer and has P not more than 0.020% and S not more than 0.005%; (3) the steel plate has denser internal quality and can meet the requirement of the JB / T1271-2002 forging detection standard; and (4) the maximum thickness of the steel plate can reach 226mm.

Description

technical field [0001] The invention relates to a steel plate for a guide vane of a large-scale hydroelectric unit, and at the same time relates to a production method of the steel plate. Background technique [0002] Large-thickness guide vanes for large-scale hydropower units use rolling instead of forged steel plates with a thickness of 186~226mm. They are mainly used for the manufacture of fixed guide vanes and disc components under the brackets for hydropower units. It requires high internal quality and a certain thickness, and also requires This kind of steel plate has good wear resistance, so it can meet the engineering needs. At present, the commonly used steel plates for guide vanes of large-scale hydropower units use 20MnSi. At present, this steel plate mainly relies on forging production in China. The cost is high and the construction period is long, which can no longer meet the needs of fast-paced. Contents of the invention [0003] The object of the present i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C33/04B22D23/10C21D8/02
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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