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High-strength and high-elongation nodular cast iron alloy and preparation method thereof

A technology of nodular cast iron and high elongation, which is applied in the field of casting alloys. It can solve the problems of high cost of heat treatment, difficulty in improving material properties, and insufficient stability of as-cast materials, so as to achieve good graphite shape, promote clean iron, and pearlescent The effect of fine body-slice spacing

Active Publication Date: 2020-11-13
HUBEI XINGYUAN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems with the above-mentioned materials: firstly, the as-cast material is not stable enough, and the mechanical properties deviate greatly; secondly, the cost of the heat treatment state is too high, and the cost performance is poor; finally, the current technological level has reached the upper limit, and it is difficult to improve the material performance. space, it is difficult to meet higher demands
However, the existing ductile iron alloy materials are difficult to meet the performance indicators of high strength and high elongation at the same time.

Method used

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  • High-strength and high-elongation nodular cast iron alloy and preparation method thereof
  • High-strength and high-elongation nodular cast iron alloy and preparation method thereof
  • High-strength and high-elongation nodular cast iron alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074]A heavy-duty tractor balance bridge support casting in this embodiment has a chemical composition ratio of C3.75%, Si2.76%, Mn0.52%, P0.035%, S0.018%, Mg0.056%, Cr0.095%, Ni0.065%, Mo0.15%, Cu0.75%, Sn0.02%, Al0.015%, Ti0.036%, V0.01%, Ba0.0025%, Ca0.0025%, RE0.002%, N0.003%, O0.0015%.

[0075] Prepare according to the following production process:

[0076] Step 1: Select high-quality pig iron with a carbon content of 4.5%, high-quality carbon, low-alloy and low-impurity briquette scrap, calcined high-purity silicon carbide, graphite-type low-sulfur carburizer, high-quality long-term special inoculant, high-magnesium spheroidized wire, Pearlitic inoculated filaments and high-strength ductile iron alloy additives are used as raw materials.

[0077] Step 2: Manufacture a special model for high-strength ductile iron castings and a sand box with adjustable temperature control film.

[0078] Step 3: The raw materials are smelted into molten iron in an intermediate frequenc...

Embodiment 2

[0090] A heavy-duty tractor balance bridge support casting of this embodiment has a chemical composition ratio of C3.55%, Si2.7%, Mn0.50%, P0.035%, S0.018%, Mg0.050%, Cr0.09%, Ni0.06%, Mo0.12%, Cu0.7%, Sn0.01%, Al0.01%, Ti0.035%, V0.008%, Ba0.002%, Ca0.002%, RE0.018%, N0.0025%, O0.0012%.

[0091] Prepare according to the following production process:

[0092] Step 1: Select high-quality pig iron with a carbon content of 4.5%, high-quality carbon, low-alloy and low-impurity briquette scrap, calcined high-purity silicon carbide, graphite-type low-sulfur carburizer, high-quality long-term special inoculant, high-magnesium spheroidized wire, Pearlitic inoculated filaments and high-strength ductile iron alloy additives are used as raw materials.

[0093] Step 2: Manufacture a special model for castings of high-strength ductile iron heavy-duty tractor balance bridge bracket and a sand box with adjustable temperature control film.

[0094] Step 3: The raw materials are smelted int...

Embodiment 3

[0106] An engine mount bracket casting in this embodiment has a chemical composition ratio of C3.80%, Si2.8%, Mn0.55%, P0.035%, S0.018%, Mg0.058%, Cr0. 1%, Ni0.07%, Mo0.15%, Cu0.8%, Sn0.02%, Al0.02%, Ti0.038%, V0.01%, Ba0.003%, Ca0.003%, RE0. 002%, N0.003%, O0.0015%.

[0107] Prepare according to the following production process:

[0108] Step 1: Select high-quality pig iron with a carbon content of 4.5%, high-quality carbon, low-alloy and low-impurity briquette scrap, calcined high-purity silicon carbide, graphite-type low-sulfur carburizer, high-quality long-term special inoculant, high-magnesium spheroidized wire, Pearlitic inoculated filaments and high-strength ductile iron alloy additives are used as raw materials.

[0109] Step 2: Manufacture a special model for castings of high-strength ductile iron heavy-duty tractor balance bridge bracket and a sand box with adjustable temperature control film.

[0110] Step 3: The raw materials are smelted into molten iron in an i...

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Abstract

The invention discloses a high-strength and high-elongation nodular cast iron alloy. The alloy adopts a special component ratio; and the alloy has a metallographic structure composed of austenite andpearlite. The invention further discloses a preparation method of the nodular cast iron alloy, and the nodular cast iron alloy with a metallographic structure composed of austenite and pearlite as a matrix structure is prepared through raw material selection, mold preparation, smelting, component adjustment, spheroidizing treatment, pouring and heat treatment. The nodular cast iron alloy has highstrength, good toughness, excellent fatigue strength and impact toughness and good processability, the indoor temperature tensile strength can reach 900 MPa or above, the yield strength can reach 600MPa or above, the elongation can reach 10% or above, and the manufacturing cost is low.

Description

technical field [0001] The invention belongs to the technical field of casting alloys, and in particular relates to a high-strength, high-elongation ductile iron alloy 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. Spheroidal graphite cast iron is obtained through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially improves plasticity and toughness, thereby obtaining higher strength than carbon steel. Ductile iron castings are used in all major industrial sectors where high strength, ductility, toughness, wear resistance, resistance to severe thermal and mechanical shoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C33/04C21C1/10C21D5/00
CPCC22C37/10C22C33/04C21C1/10C21D5/00
Inventor 冀元贵罗铖
Owner HUBEI XINGYUAN SCI & TECH
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