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Ultralow-temperature nodular cast iron and preparation method thereof

A ductile iron, ultra-low temperature technology, applied in the field of metal casting, can solve the problems of continuous improvement of the mechanical properties of ductile iron materials

Inactive Publication Date: 2020-11-03
FUXIN HONGSHUN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the chemical composition control and smelting process control disclosed in the current prior art, it is difficult to continuously improve the mechanical properties of ductile iron materials

Method used

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  • Ultralow-temperature nodular cast iron and preparation method thereof
  • Ultralow-temperature nodular cast iron and preparation method thereof
  • Ultralow-temperature nodular cast iron and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 Screening experiment of key parameters of the preparation method of low temperature ductile iron.

[0032] 1. Screening experiment of C element content: start from 3.5%, increase by 0.1% each time, see Table 2.

[0033] Table 2. The effect of different content of C elements on low temperature impact energy J.

[0034] C％ 3.5 3.6 3.7 3.8 3.9 Low temperature impact energy J 10.2 10.8 11.5 12.5 11.1

[0035] 2. Screening experiment of Si element content: start from 1.6%, increase by 0.1% each time, see Table 3.

[0036] Table 3. Effect of different contents of Si element on low temperature impact energy J.

[0037] Si% 1.6 1.7 1.8 1.9 2.0 Low temperature impact energy J 9.6 10.8 12.8 12.7 12.6

[0038] 3. Screening experiment of Mg element content: start the experiment from 0.030%, increase by 0.002% each time, see Table 4.

[0039] Table 4. The effect of different contents of Mg element on low temperatur...

Embodiment 2

[0060] Example 2 Production process of ultra-low temperature ductile iron.

[0061] The preparation method of ultra-low temperature ductile iron specifically includes the following steps.

[0062] Step 1, raw material preparation.

[0063] (1) Weigh Benxi Steel’s super-grade Q10 pig iron, Mn≦0.1%, S≦0.03%, P≦0.015%, Ti≦0.010%, Cr≦0.015% according to the burden ratio in Table 7, and return it to the furnace charge.

[0064] (2) Add pig iron to the 1-ton intermediate frequency furnace according to the charge ratio in Table 8, return the charge, and start smelting scrap steel. When molten iron appears in the intermediate frequency furnace, add carburant to continue smelting. When the temperature of the molten iron reaches 1450°C, the molten iron is pretreated.

[0065] Table 8. Charge ratio (mass percentage).

[0066]

[0067] Step 2, molten iron pretreatment.

[0068] 1) When the temperature of the molten iron reaches 1450°C, measure the S content of the molten iron to be...

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Abstract

The invention belongs to the technical field of metal casting, and particularly relates to ultralow-temperature nodular cast iron and a preparation method thereof. The ultralow-temperature nodular cast iron is composed of the following components of, in percentage by weight, 3.7%-3.8% of C, 1.8%-1.9% of Si, 0%-00.1 %of Mn, 0%-0.01% of S, 0%-0.015% of P, 0.035%-0.045% of Mg, 0.75%-0.85% of Ni, 0%-0.010% of Ti, 0%-0.015% of Cr, the balance Fe and other inevitable impurities in the production process. The preparation method of the ultralow-temperature nodular cast iron comprises the following steps of 1, raw material preparation; 2, pretreatment of molten iron; and 3, spheroidizing treatment and inoculating treatment. According to the preparation method of the ultralow-temperature nodular cast iron, the mechanical property of a produced casting meets the designed requirement in the environment of -70 DEG C, the tensile strength Rm is larger than or equal to 450 Mp, the elongation delta islarger than or equal to 20, and the impact energy KV2 is larger than or equal to 12 J; and the ultralow-temperature nodular cast iron provides support in the aspect of raw materials for equipment inthe field of rail transit, wind power, spaceflight and the like.

Description

technical field [0001] The invention belongs to the technical field of metal casting technology, and in particular relates to an ultra-low temperature ductile iron and a preparation method thereof. Background technique [0002] Ductile cast iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. It is based on its excellent performance that it has been successfully used to cast some complex stress, strength, toughness, and wear resistance. Parts with high performance requirements. The so-called "substituting iron for steel" mainly refers to ductile iron. Spheroidal graphite cast iron is obtained through spheroidizing and inoculating treatment, which effectively improves the mechanical properties of cast iron, especially improves the plasticity and toughness, so as to obtain higher strength than carbon steel. [0003] Low-temperature ductile iron materials have been widely used in high-end equipment manufac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C37/06C22C37/10C21C1/10C22C33/10
CPCC21C1/105C22C33/10C22C37/04C22C37/06C22C37/10
Inventor 海皓王建涛苗向东朱艳峰杨明昊
Owner FUXIN HONGSHUN MACHINERY
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