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High-strength gray cast iron

一种灰铸铁、拉伸强度的技术，应用在灰铸铁领域，能够解决热疲劳寿命降低、传热率降低、机械加工性变差等问题，达到降低凝固温度、抑制铸造缺陷的效果

Active Publication Date: 2019-06-18
HYUNDAI MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this gray cast iron has problems of poor machinability due to an increase in ferrite structure and a decrease in heat transfer rate due to spheroidization of a part of graphite, resulting in a decrease in thermal fatigue life

Method used

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  • High-strength gray cast iron
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Examples

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Embodiment Construction

[0027] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should be further understood that when the terms "comprising", "including", "having" and the like are used in this specification to designate the existence of said features, regions, integers, steps, operations, elements and / or components, but do not exclude one or The presence or addition of various other features, regions, integers, steps, operations, elements, components and / or combinations thereof.

[0028] It should be understood that the term "vehicle" or "vehicular" or other similar terms as used herein generally includes motor vehicles such as passenger automobiles including sport utility vehicles (SUVs), buses, trucks, various commercial vehicles, Watercraft including boats, ships, aircraft...

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Abstract

Disclosed herein is a gray cast iron having high strength and reduced casting defects. The high-strength gray cast iron may include: an amount of about 3.10 to 3.50 wt % of carbon (C), an amount of about 2.10 to 2.40 wt % of silicon (Si), an amount of about 0.50 to 0.80 wt % of manganese (Mn), an amount less than or equal to about 0.10 wt % (not including 0%) of phosphorus (P), an amount less thanor equal to about 0.10 wt % (not including 0%) of sulfur (S), an amount of about 0.25 to 0.45 wt % of chromium (Cr), an amount of about 1.00 to 1.40 wt % of copper (Cu), an amount less than or equalto about 0.20 wt % (not including 0%) of nickel (Ni), and a balance of iron (Fe), all the wt % are based on the total weight of the gray cast iron. In particular, the gray cast iron may include a carbon equivalent (CEQ) of about 3.95 to 4.1% calculated by the Equation 1.

Description

technical field [0001] The present invention relates to gray cast iron. In particular, the gray cast iron can have high strength and reduced casting defects. Background technique [0002] Gray cast iron is a material widely used for components of vehicle internal combustion engines because of its relative cheapness and high performance. Due to the interrelationship between physical properties (such as tensile strength and fatigue strength), cost and productivity (such as machinability of the material used), gray cast iron is used in combination with various elements in appropriate proportions. [0003] The conventional 250MPa general-purpose gray cast iron FC250 is difficult to have high strength due to the excessive growth of graphite due to its relatively high carbon equivalent. [0004] Therefore, in recent years, high-strength gray cast iron having increased strength by reducing the carbon equivalent of gray iron to refine graphite and adding alloy elements such as Cu ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/08
CPCC22C33/08C22C37/06C22C37/08C22C37/10C21D2211/005C21D2211/009
Inventor 朴勋荣
Owner HYUNDAI MOTOR CO LTD
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