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High-strength high-toughness low-temperature-resistant ferritic nodular cast iron

A ductile iron, toughness technology, applied in the field of ductile iron materials, can solve problems such as no clear strength index

Inactive Publication Date: 2012-10-03
上海宏钢电站设备铸锻有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The result is that the ductile iron meets the impact requirements of the international standard -20°C and -40°C, but there is no clear strength index

Method used

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  • High-strength high-toughness low-temperature-resistant ferritic nodular cast iron

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Experimental program
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Embodiment Construction

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] A high-strength, strong-toughness, low-temperature-resistant ferritic ductile iron, the weight percentages of its components are as follows:

[0020] C 3.62~3.80%, Si 1.90~2.35%, Mn <0.20%,

[0021] RE 0.007~0.018%, Mg 0.043~0.060%, P<0.035%, S≤0.020%,

[0022] The remainder is iron and other impurity elements. In the impurity elements, Mo<0.010%, Ti<0.025%,

[0023] The silicon-carbon ratio is Si / C=0.50~0.63.

[0024] The component parameters of each embodiment are as follows:

[0025] .

[0026] In each of the examples, there are two kinds of co-cast test blocks of 40mm and 70mm.

[0027] The smelting and pouring process is as follows:

[0028] 1. 1. Charge ratio: (weight percentage of molten iron, the same below): 40% pig iron for ductile iron, 40% carbon scrap, and 20% ductile iron scrap.

[0029] Then add 1.0~1.30% recarburizer to ach...

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Abstract

The invention discloses high-strength high-toughness low-temperature-resistant ferritic nodular cast iron. The high-strength high-toughness low-temperature-resistant ferritic nodular cast iron comprises the following components in percentage by weight: 3.62 to 3.80 percent of C, 1.90 to 2.35 percent of Si, less than 0.20 percent of Mn, 0.007 to 0.018 percent of RE, 0.043 to 0.060 percent of Mg, less than 0.035 percent of P, less than or equal to 0.020 percent of S, and the balance of iron and other impurity elements, wherein in the impurity elements, Mo is controlled to be less than 0.010 percent, and Ti is controlled to be less than 0.025 percent; and the ratio of the Si to the C is 0.50-0.63. Through a lot of test and research, the Si-C ratio is reasonably controlled, low-temperature nodular cast iron can obtain relatively high tensile strength and yield strength, and the low-temperature impact toughness of -40 DEG C can also be ensured; and the ideal low-temperature impact toughness is obtained while the function of a silicon reinforced metallic matrix is exerted, so that the performance requirements are met, and the cost is also greatly reduced.

Description

technical field [0001] The invention relates to a ductile iron material, in particular to a ferrite ductile iron with high strength, toughness and low temperature resistance (-40°C). Background technique [0002] Wind is a green and renewable resource. As a clean energy in the 21st century, the total amount of wind power generation in the world has grown at an annual rate of 26% in the past 10 years, and there will still be a larger growth rate in the future. List "high-power wind turbines" as the main content of revitalizing the equipment manufacturing industry. Because wind turbines are installed in different wind farms, whether on land or at sea, the operating environment temperature varies greatly (the working environment temperature is -20°C to 40°C, and the living environment temperature does not exceed -40°C to 50°C). In wind power components, the hub, frame, base and other components are all made of low-temperature ductile iron, and are required to have low-temperat...

Claims

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Application Information

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IPC IPC(8): C22C37/10
Inventor 蒋毓良张伟徐德民吴铁明
Owner 上海宏钢电站设备铸锻有限公司
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