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High-hardenability alloyed gray iron die material and preparation method thereof

A high hardenability, mold material technology, applied in the direction of improving energy efficiency, process efficiency, etc., can solve the problems of lack, element coincidence strengthening effect is not obvious, white mouth tendency effect is not strong, etc., to achieve advanced ratio, The ratio is reasonable and the effect of improving the comprehensive performance

Inactive Publication Date: 2011-04-27
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The chemical composition of Chinese patent CN1693525 does not add any micro-alloying elements, so this alloy gray iron material lacks a strong effect of promoting graphitization and reducing whitening tendency, and can only be used as a general automobile cover alloy gray iron mold material use
[0010] The chemical composition of the relevant chemical composition of the mold material involved in the Japanese patent contains higher silicon content and lower molybdenum content. The strengthening mechanism of this mold material is mainly through the strengthening effect of silicon in the matrix and other alloying elements. On the other hand, the mold material does not add microalloying elements, so the coincident strengthening effect of elements is not obvious, and the effect of promoting graphitization and reducing whitening tendency is not strong

Method used

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  • High-hardenability alloyed gray iron die material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Chemical composition (wt%) is as follows:

[0059] C 2.8%, Si 1.7%, Mn 0.6%, P 0.05%, S 0.01%, Cr 0.35%, Cu 1.10%, Mo 0.6%, Ni 0.2%, V 0.10%, and the balance is Fe.

[0060] Ingredients are formulated according to the above chemical composition and placed in an intermediate frequency coreless induction melting furnace for melting, and the melting temperature is controlled at 1300°C. The poured φ30×150mm sample is subjected to surface medium-frequency induction quenching treatment with mobile induction hardening equipment, the output power is 20KW, the quenching temperature is controlled at 850°C, and the quenching method is air cooling.

[0061] Performance test: the surface hardness is 53HRC, the depth of the hardened layer is 2.73mm, and the tensile strength of the single-cast test bar is 460MPa.

Embodiment 2

[0063] Chemical composition (wt%) is as follows:

[0064] C 3.0%, Si 1.9%, Mn 0.7%, P 0.06%, S 0.015%, Cr 0.40%, Cu 1.15%, Mo 0.7%, Ni 0.4%, V 0.20%, and the balance is Fe.

[0065] Ingredients are formulated according to the above chemical composition and placed in an intermediate frequency coreless induction melting furnace for melting, and the melting temperature is controlled at 1400°C. The poured φ30×150mm sample is subjected to surface intermediate frequency induction quenching treatment with mobile induction hardening equipment, the output power is 24KW, the quenching temperature is controlled at 900°C, and the quenching method is air cooling.

[0066] Performance test: the surface hardness is 55HRC, the depth of the hardened layer is 2.66mm, and the tensile strength of the single-cast test bar is 473MPa.

Embodiment 3

[0068] The chemical composition (wt%) of the alloy gray cast iron is as follows:

[0069] C 3.3%, Si 2.0%, Mn 0.7%, P 0.07%, S 0.02%, Cr 0.50%, Cu 1.20%, Mo 0.9%, Ni 0.6%, V 0.30%, and the balance is Fe.

[0070] Ingredients are formulated according to the above chemical composition and placed in an intermediate frequency coreless induction melting furnace for melting, and the melting temperature is controlled at 1500°C. The poured φ30×150mm sample is subjected to surface intermediate frequency induction quenching treatment with mobile induction hardening equipment, the output power is 28KW, the quenching temperature is controlled at 950°C, and the quenching method is air cooling.

[0071] Performance test: the surface hardness is 56HRC, the depth of the hardened layer is 2.60mm, and the tensile strength of the single-cast test bar is 492MPa.

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Abstract

The invention provides a high-hardenability alloyed gray iron die material and a preparation method thereof. The high-hardenability alloyed gray iron die material comprises the following components in percentage by weight: 2.8-3.3 percent of C, 1.7-2.0 percent of Si, 0.6-0.9 percent of Mn, no more than 0.08 percent of P, no more than 0.03 percent of S, 0.3-0.5 percent of Cr, 1.0-1.2 percent of Cu, 0.6-0.9 percent of Mo, 0.2-0.6 percent of Ni, 0.1-0.3 percent of V and the rest of Fe. The preparation method comprises the following steps of: preparing materials according to the materials, melting the prepared materials in a medium frequency coreless induction melting furnace at melting temperature of 1300-1500DEG C; and using a mobile induction heating device to carry out surface medium frequency induction quenching treatment on an obtained cast, wherein output power is 20-28KW, quenching temperature is 850-950EG C, and air cooling is used after quenching;. The invention greatly increases the combination property of alloyed gray iron materials, thereby having good popularization and application prospects.

Description

technical field [0001] The invention belongs to the field of manufacturing technology of alloy gray iron materials, and relates to a high hardenability gray iron mold material for large automobile covering parts and a preparation method thereof, in particular to a high hardenability alloy gray iron mold material and its preparation method. Background technique [0002] The mold materials used in the manufacture of large-scale automobile panel molds are usually alloy gray iron materials. The mold materials for making automobile body panels need good performance, the most important is the strength index and hardenability index, because the automobile panel mold is in Failure forms such as fracture, deformation, wear, bonding, gnawing, and softening may occur during the service process. Therefore, the mold material should have high strength and high hardenability performance indicators to be resistant to deformation, wear, breakage, and durability. Fatigue and resistance to so...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08C21D1/42C21D1/18C21D5/00
CPCY02P10/20Y02P10/25
Inventor 续维周伟汪宏斌吴晓春
Owner BAOSHAN IRON & STEEL CO LTD
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