Insert material for heat-resisting ductile iron stamping die

A technology of stamping die and heat-resistant ductile iron, applied in the field of heat-resistant ductile iron mold material, can solve the problem of high cost of die steel, and achieve the effects of low fatigue crack length, good comprehensive performance and reasonable composition design

Inactive Publication Date: 2010-06-16
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the problem of high cost of existing die steel, and provide a heat-resistant nodular cast iron stamping die insert material suitable for stamping and forming thicker steel plates at high temperatures

Method used

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  • Insert material for heat-resisting ductile iron stamping die
  • Insert material for heat-resisting ductile iron stamping die
  • Insert material for heat-resisting ductile iron stamping die

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] refer to figure 1 , the components of the heat-resistant ductile iron stamping die insert material according to the present invention and the content by weight percentage (wt.%) are: C: 2.6%, Si: 5.5%, Mn: 0.8%, Cr: 0.6% , the balance being Fe. It is smelted in an alkaline intermediate frequency induction furnace. First, pig iron and scrap steel are melted in the furnace, and then alloy is added to adjust the alloy composition. After the iron alloy is cleared, the slag on the surface of the molten iron is removed, and finally it is poured out of the furnace. Its spheroidizing treatment is the same as that of general nodular cast iron, that is, the punching method is adopted. The molten iron temperature is about 1450°C to 1500°C, and the spheroidizing temperature is about 1350°C to 1450°C. A rare earth magnesium nodulizer is used in an amount of 0.4-1.6% of the total amount (wt.%) of the molten iron. Using green sand casting.

[0036] The shape and distribution of g...

Embodiment 2

[0038] refer to figure 2 , the components of the heat-resistant ductile iron stamping die insert material according to the present invention and the content by weight percentage (wt.%) are: C: 2.6%, Si: 5.5%, Mn: 1.0%, Cr: 0.8% , the balance being Fe. It is smelted in an alkaline intermediate frequency induction furnace. First, pig iron and scrap steel are melted in the furnace, and then alloy is added to adjust the alloy composition. After the iron alloy is cleared, the slag on the surface of the molten iron is removed, and finally it is poured out of the furnace. Its spheroidizing treatment is the same as that of general nodular cast iron, that is, the punching method is adopted. The molten iron temperature is about 1450°C to 1500°C, and the spheroidizing temperature is about 1350°C to 1450°C. A rare earth magnesium nodulizer is used in an amount of 0.4-1.6% of the total amount (wt.%) of the molten iron. Using green sand casting.

[0039] The morphology and distributio...

Embodiment 3

[0041] refer to image 3 , the components of the heat-resistant ductile iron stamping die insert material according to the present invention and the content by weight percentage (wt.%) are: C: 2.6%, Si: 5.0%, Mn: 0.6%, Cr: 0.8% , the balance being Fe. It is smelted in an alkaline intermediate frequency induction furnace. First, pig iron and scrap steel are melted in the furnace, and then alloy is added to adjust the alloy composition. After the iron alloy is cleared, the slag on the surface of the molten iron is removed, and finally it is poured out of the furnace. Its spheroidizing treatment is the same as that of general nodular cast iron, that is, the punching method is adopted. The molten iron temperature is about 1450°C to 1500°C, and the spheroidizing temperature is about 1350°C to 1450°C. A rare earth magnesium nodulizer is used in an amount of 0.4-1.6% of the total amount (wt.%) of the molten iron. Using green sand casting.

[0042] The morphology and distribution...

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Abstract

The invention discloses an insert material for a heat-resisting ductile iron stamping die, aiming at overcoming the problem that the conventional die steel has high cost and providing a die material of a thicker steel plate which is stamped and formed under high temperature. The die material comprises the following components in percentage by weight: 2.4 to 2.9 percent of C, 4 .0 to 6.0 percent of Si, 0.3 to 1.2 percent of Mn, 0.3 to 1.2 percent of Cr and the balance of Fe. A preparation method of the die material comprises the following steps of: smelting by adopting an alkaline medium-frequency induction furnace, firstly clearing pig iron and steel scraps in the furnace, then adding alloys, adjusting the content of the alloys, taking away the furnace slag on the surface of iron liquid after iron alloy is cleared, and finally discharging from the furnace and pouring. The material has the properties of more than 505MPa of tensile strength and below 0.20g / m<2>h of oxidation speed after the heat preservation for 150 hours at 800 DEG C, belongs to a heat-resisting material, and has below 1.2mm of fatigue crack length after circulating 2000 times at 25 to 800 DEG C, thereby being superior to the performance of heat-resisting gray pig iron.

Description

technical field [0001] The invention relates to a heat-resistant ductile iron mold material, more specifically, the invention relates to a heat-resistant ductile iron stamping die insert material. Background technique [0002] The materials for making heat-resistant molds are mainly heat-resistant steel, stainless steel, heat-resistant cast iron, etc. Cast iron is widely used to make glass molds and steel ingot molds because of its excellent casting performance and easy processing performance, cheap price and convenient manufacture. Commonly used cast iron heat-resistant mold materials at home and abroad are mainly gray cast iron, low alloy cast iron and nodular cast iron. [0003] When the die is punching a thicker hot steel plate, the die is frequently in contact with the high-temperature steel plate, and suffers from oxidation, growth, thermal fatigue, wear and other effects. This requires such molds to have properties such as anti-oxidation, anti-growth, anti-thermal f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10
Inventor 于思荣朱先勇苏建国刘耀辉刘家安孙钰
Owner JILIN UNIV
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