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Low-temperature impact resistant as-cast ductile iron with big section and production method thereof

A production method and large-section technology, which are applied in the field of low-temperature impact-resistant large-section as-cast ductile iron and its production field, can solve the problem of difficulty in ensuring material properties and stability, reduction in low-temperature impact toughness of castings, and reduction in brittle transition temperature of castings, etc. problems, to achieve the effect of improving the anti-recession ability, increasing the elongation, and improving the spheroidization effect.

Inactive Publication Date: 2009-02-11
辽宁隆达集团百星达铸造有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This formula is a conventional formula for the production of ordinary ductile iron. It is used to produce large-section ductile iron castings with special requirements for low-temperature impact performance at -20°C to -40°C. It is difficult to ensure excellent material properties and its stability
In addition, the upper limit of Si specified in this patent is too high, which is 3.0%, which will cause a sharp drop in the brittle transition temperature of the casting, resulting in a sharp drop in the low-temperature impact toughness of the casting, posing a safety hazard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The low-temperature impact-resistant large-section cast ductile iron produced at -20°C does not contain Ni in the composition, and its chemical composition is: C 3.6%, Si 2.0%, Mn 0.35%, S 0.02%, P 0.05%, Ti0.05%, Mg0.04%, Re0.02%, and the balance is Fe.

[0030] The production method of cast ductile iron with large cross-section and low temperature impact resistance at -20°C:

[0031] Adjust the temperature and tempering of the molten iron in the furnace to make its chemical composition reach: C 3.7%, Si 0.8%, Mn 0.38%, S 0.035%, P 0.05%, Ti 0.05%, and the balance is Fe;

[0032]First preheat the treatment bag to 500°C, remove the residual iron block at the bottom of the bag, and put nodulizer into the embankment or pit. Then cover rust-free iron filings or grass ash, soda, perlite slag collector, etc., control the temperature of the molten iron at 1380-1430°C, use the flushing method for spheroidization treatment, and at the same time perform one-time inoculation bef...

Embodiment 2

[0041] The low-temperature impact-resistant large-section cast ductile iron produced at -40°C does not contain Ni in the composition, and its chemical composition is: C 3.8%, Si 2.5%, Mn 0.35%, S 0.02%, P 0.05%, Ti0.05%, Mg0.06%, Re0.03%, and the balance is Fe.

[0042] The production method of cast ductile iron with large cross-section and low temperature impact resistance at -40°C:

[0043] Adjust the temperature and tempering of the molten iron in the furnace to make its chemical composition reach: C 3.9%, Si 1.2%, Mn0.38%, S≤0.035%, P≤0.05%, Ti≤0.05%, and the balance is Fe;

[0044] First preheat the treatment bag to 500°C, remove the residual iron block at the bottom of the bag, put nodulizer into the embankment or pit, and put the flat bottom bag on one side. It is covered with an inoculant whose particle size is equal to or smaller than that of the nodulizer, and then covered with rust-free iron filings or grass ash, soda, perlite slag collector, etc. Control the tem...

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Abstract

The invention discloses a large-section as-cast magnesium iron with low-temperature impact resistance and a production method thereof. Compared with the magnesium iron produced by the prior art, the large-section as-cast magnesium iron with the low-temperature impact resistance has high low-temperature impact ductility and high elongation, does not contain Ni and can meet the requirement of a large-section magnesium iron casting which has special requirements for resisting the temperature of minus 20 DEG C to minus 40 DEG C; the large -section as-cast magnesium iron with the low-temperature impact resistance produced by the method takes the plain cast iron as a raw material, has high ductility, the mechanical properties of the large-section as-cast magnesium iron meets or is superior to the requirements of GJS400-18-LT designtion in EN1563 standard.

Description

technical field [0001] The invention relates to as-cast nodular iron and a production method thereof, in particular to a low-temperature impact-resistant large-section cast nodular iron and a production method thereof. Background technique [0002] Large-section high-toughness ductile iron is widely used in wind power generation equipment, including large castings such as hubs and nacelle bases, and the weight of a single piece can reach 5 to 15 tons. Foreign countries generally adopt EN1563 material standards, usually the material grades are EN GJS 400-18-LT (this grade requires low-temperature impact performance at -20°C) and EN GJS350-22-LT (this grade requires low-temperature impact performance at -40°C) High-toughness ductile iron, the former is equivalent to the brand QT400-18-AL in the Chinese national standard GB1348-88, while the latter has no such brand standard in China. Component inspection requires taking co-casting test blocks for performance and metallographi...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08C21C7/00
Inventor 李瑞学宫俊波陈英
Owner 辽宁隆达集团百星达铸造有限责任公司
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