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High-hardness alloyed nodular iron die material and preparation method thereof

A mold material and alloy ball technology, applied in the field of alloy ductile iron material manufacturing process, can solve problems such as wear and adhesion, and achieve the effect of improving comprehensive performance

Active Publication Date: 2011-08-31
宝武特种冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this kind of automobile panel mold material is prone to fracture, deformation, wear,

Method used

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  • High-hardness alloyed nodular iron die material and preparation method thereof
  • High-hardness alloyed nodular iron die material and preparation method thereof
  • High-hardness alloyed nodular iron die material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] See Table 1 for chemical composition. According to the chemical composition in Table 1, the ingredients were placed in an intermediate frequency induction melting furnace for melting, the melting temperature was controlled at 1400°C, and the temperature was kept for 0.8 hours after complete melting. The poured Y-shaped sample is subjected to surface intermediate frequency induction quenching treatment with a mobile induction hardening equipment, the output power is 24KW, the quenching temperature is controlled at 880°C, the quenching time is controlled at 2min / mm (thickness of ductile iron), and the quenching cooling method is air cooled.

[0043] Performance test: the surface hardness is 61HRC, the depth of the hardened layer is 2.78mm, and the tensile strength is 740MPa. See Table 2.

Embodiment 2

[0045] See Table 1 for chemical composition. According to the chemical composition, the ingredients are placed in a medium-frequency coreless induction melting furnace for melting. The melting temperature is controlled at 1300 ° C, and the temperature is kept for 0.5 hours after complete melting. The poured Y-shaped sample is subjected to surface intermediate frequency induction quenching treatment with a mobile induction hardening equipment, the output power is 20KW, the quenching temperature is controlled at 850°C, the quenching time is controlled at 2min / mm (thickness of ductile iron), and the quenching cooling method is air cooled.

[0046] Performance test: the surface hardness is 60HRC, the depth of the hardened layer is 2.71mm, and the tensile strength is 733MPa.

Embodiment 3

[0048] See Table 1 for chemical composition. According to the chemical composition, the ingredients are placed in a medium-frequency coreless induction melting furnace for melting. The melting temperature is controlled at 1500 ° C, and the temperature is kept for 0.9 hours after complete melting. The surface of the cast Y-shaped sample is quenched with a mobile induction hardening device, the output power is 28KW, the quenching temperature is controlled at 950°C, the quenching time is controlled at 4min / mm (thickness of ductile iron), and the quenching cooling method is air cooled.

[0049] Performance test: the surface hardness is 63HRC, the depth of the hardened layer is 2.85mm, and the tensile strength is 752MPa.

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Abstract

The invention relates to a high-hardness alloyed nodular iron die material which comprises, by weight, 3.4-3.9% of C, 2.0-2.5% of Si, 0.2-0.4% of Mn, less then 0.02% of P, less then 0.02% of S, 0.4-0.6% of Cr, 0.7-1.0% of Cu, 0.4-0.6% of Mo, 0.6-1.0% of Ni, and the balance Fe. The preparation method includes the following steps of proportioning a material according to the above chemical components, placing the material to an intermediate frequency coreless induction melting furnace for melting at a melting temperature of 1300 DEG to 1500 DEG; casting the alloyed nodular iron; carrying out a surface intermediate frequency induction quenching treatment on the alloyed nodular iron via a movable induction heating device with an output power of 20 to 28 kW and at a quenching temperature of 850DEG to 950 DEG; and air-cooling the alloyed nodular iron after quenching. Through the novel proportioning of the chemical components, the alloyed nodular iron die material becomes suitable for the manufacture of large-scale automobile panels in mass production, and is excellent in strength and hardenability.

Description

technical field [0001] The invention relates to the field of manufacturing technology of alloy ductile iron materials, in particular to a high-strength nodular iron mold material for large automobile covering parts and a preparation method thereof. Background technique [0002] Alloy cast iron mold materials are usually divided into alloy gray iron mold materials and alloy ductile iron mold materials. The mold materials used to manufacture large automobile panel molds are usually alloy cast iron mold materials. When producing automobile panels in small and medium batches, alloy gray iron mold materials are generally used for the panel mold materials, and alloy ductile iron mold materials are mostly used for mass production of automobile panels. For the production of mold materials for automobile body panels used in mass production, the most important performance indicators of the panel mold are strength index, hardenability and hardenability index, because the automobile pan...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08C21D5/00C21D1/18
Inventor 续维吴晓春汪宏斌周伟薛厂
Owner 宝武特种冶金有限公司
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