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Low-temperature high-toughness nodular cast iron for large thick-wall wind power casting and preparation method of low-temperature high-toughness nodular cast iron

A technology of ductile iron and thick-walled castings, which is applied in the field of metallurgy, can solve the problems of unfavorable casting cost control, etc., and achieve the effects of reducing cross-section sensitivity, pure material, and stable metallographic structure

Pending Publication Date: 2020-12-15
宁波日星铸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Bao Yulong added 1.0-1.5% nickel to ensure the low-temperature impact performance of the material in "A Preparation Method for Low-temperature and Corrosion-resistant Ductile Iron for Wind Power". This control method can indeed achieve low-temperature impact indicators, but nickel is a precious metal, and the price At 120,000-170,000 per ton, it is very unfavorable for casting cost control

Method used

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  • Low-temperature high-toughness nodular cast iron for large thick-wall wind power casting and preparation method of low-temperature high-toughness nodular cast iron
  • Low-temperature high-toughness nodular cast iron for large thick-wall wind power casting and preparation method of low-temperature high-toughness nodular cast iron
  • Low-temperature high-toughness nodular cast iron for large thick-wall wind power casting and preparation method of low-temperature high-toughness nodular cast iron

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Experimental program
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Effect test

Embodiment 1

[0052] The preparation process of the low-temperature high-toughness ductile iron for large thick-walled wind power castings in this embodiment is as follows:

[0053] (1) Raw materials are configured according to the following weight percentages: 80% pig iron, 20% scrap steel, 8% coke, 3% limestone, and 0.9% ferrosilicon. Add pig iron, scrap steel, coke, limestone, and ferrosilicon to the cupola at one time for smelting It is molten iron, and the tapping temperature is controlled at 1500°C.

[0054] Among them, the components of pig iron include: C4.60%, Si0.40%, Mn0.1%, P0.013%, S0.020%, As0.0003%, Pb0.0002%, Sn0.0003 %, Sb0.0004%, Zn0.0002%, Cr0.0041%, Ni0.0030%, Cu0.0030%, V0.010%, Ti0.012%, Mo0.0008%, B≤0.0007% (meet pig iron Components by weight percentage C≥4.00%, Si0.30-0.60%, Mn≤0.1%, P≤0.020%, S≤0.025%, As≤0.0008%, Pb≤0.0005%, Sn≤0.0005%, Sb≤ 0.0006%, Zn≤0.0003%, Cr≤0.0050%, Ni≤0.0060%, Cu≤0.0050%, V≤0.010%, Ti≤0.015%, Mo≤0.0010%, B≤0.0010%),

[0055] Scrap steel ...

Embodiment 2

[0075] In this embodiment, the preparation process of low-temperature high-toughness ductile iron for large thick-walled wind power castings is as follows:

[0076] (1) Raw materials are configured according to the following weight percentages: 85% pig iron, 15% scrap steel, 9% coke, 2.5% limestone, and 1.2% ferrosilicon. Add pig iron, scrap steel, coke, limestone, and ferrosilicon to the cupola at one time for smelting It is molten iron, and the tapping temperature is controlled at 1500°C.

[0077] Among them, the components of pig iron include: C4.60%, Si0.40%, Mn0.1%, P0.013%, S0.020%, As0.0003%, Pb0.0002%, Sn0.0003 %, Sb0.0004%, Zn0.0002%, Cr0.0041%, Ni0.0030%, Cu0.0030%, V0.010%, Ti0.012%, Mo0.0008%, B≤0.0007% (meet pig iron Components by weight percentage C≥4.00%, Si0.30-0.60%, Mn≤0.1%, P≤0.020%, S≤0.025%, As≤0.0008%, Pb≤0.0005%, Sn≤0.0005%, Sb≤ 0.0006%, Zn≤0.0003%, Cr≤0.0050%, Ni≤0.0060%, Cu≤0.0050%, V≤0.010%, Ti≤0.015%, Mo≤0.0010%, B≤0.0010%),

[0078] Scrap steel i...

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Abstract

The invention relates to low-temperature high-toughness nodular cast iron for a large thick-wall wind power casting and a preparation method of the low-temperature high-toughness nodular cast iron, and belongs to the technical field of metallurgy. The low-temperature high-toughness nodular cast iron for the large thick-wall wind power casting comprises the following components in percent by weight: 3.65-3.75% of C, 1.95-2.05% of Si, 0.15-0.25% of Mn, less than or equal to 0.025% of P, 0.005-0.015% of S, 0.035-0.047% of Mg, 0.002-0.006% of RE, 0.003-0.007% of Sb and the balance of Fe. Accordingto the low-temperature high-toughness nodular cast iron, expensive metal elements are not additionally added on the basis of QT400-18AL type cast iron, and on the premise that the strength of the cast iron is guaranteed, the low-temperature high-toughness nodular cast iron has good low-temperature high-toughness performance when applied to the large thick-wall casting.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a low-temperature high-toughness ductile iron for large thick-walled wind power castings and a preparation method thereof. Background technique [0002] Ductile iron is widely used in wind turbines. According to incomplete statistics, the installed capacity of wind power in the world exceeded 3000GW from 2014 to 2019. With the development of the wind power market, the total installed capacity of wind power is still growing. The installed capacity of wind turbines can be divided into onshore wind turbines and offshore wind turbines according to the area. Generally, the impact requirements of offshore wind turbines on castings are -20°C without notch impact, while onshore wind turbines require -40°C to -20°C without gap impact; for wind power Units with ductile iron castings that are used in low temperature environments all the year round need to use QT350-22AL hubs and bases with...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C22C33/10C21C1/10
CPCC21C1/10C21C1/105C22C33/10C22C37/04C22C37/10Y02P10/20
Inventor 杨麟王惠兵赵益锋王益利
Owner 宁波日星铸业有限公司
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