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Method for vermicular cast iron by using mixed vermiculizer

A technology of vermicular graphite cast iron and vermicularizing agent, which is used in high wear resistance vermicular graphite cast iron castings, detection of sulfur content in molten iron before furnace, and high-strength fields, which can solve the problem of high ferrite content, poor stability and low tensile strength. And other issues

Inactive Publication Date: 2012-11-28
丹阳市锦雄机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the root cause of poor stability and low creep rate in the production of vermicular graphite cast iron is that the composition of the vermicular agent cannot be coordinated with the change of sulfur content in molten iron, resulting in large fluctuations in creep rate, high ferrite content in the structure, and low tensile strength. Inferior problems limit the wide application of compacted graphite cast iron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of method adopting mixed vermicularizer to prepare vermicular graphite cast iron, by weight percentage, comprises the following steps:

[0022] 1. Ingredients: Chemical composition of molten iron: C: 3.40-3.65%, Si: 1.40-1.8%, Mn: 0.3-0.9%, phosphorus P: 0-0.07%, sulfur S: 0.03-0.07%, and the rest is iron.

[0023] 2. Mixed vermicular agent configuration: mix 75% rare earth magnesium calcium vermicular agent and 25% low-silicon magnesium agglomerate spheroidizer to form a mixed vermicular agent. Rare earth magnesium calcium vermicular agent composition is: Re: 10-13%, Ca: 3-5%, Mg: 3-5%, Si: 43-47%, Cr: 1-3%, Cu: 3-5% , Ti: 0-1%, and the rest is iron; adding Cr and Cu to the vermicular agent can combine vermicularization and microalloying, and increase and stabilize the pearlite content in the vermicular graphite cast iron matrix; low-silicon magnesium agglomerate spheroidizer The composition is: Mg: 6-8%, Si: ≤10%, and the rest is iron.

[0024] 3. Vermiculari...

Embodiment 2

[0031] A method for preparing vermicular graphite cast iron by mixing a vermicularizing agent has the following steps:

[0032] 1. Ingredients: Chemical composition of molten iron: C: 3.40-3.65%, Si: 1.40-1.8%, Mn: 0.3-0.9%, phosphorus P: 0-0.07%, sulfur S: 0.03-0.07%, and the rest is iron;

[0033] 2. Mixed vermicular agent configuration: 90% rare earth magnesium calcium vermicular agent and 10% low-silicon magnesium agglomerate spheroidizer are mixed to form a mixed vermicular agent. Rare earth magnesium calcium vermicular agent and low silicon magnesium agglomerate spheroidizer are the same as in Example 1.

[0034] 3. Vermative treatment: when the molten iron in the electric furnace melts to 1430~1440°C, take a sample of the molten iron to detect the sulfur content in the original molten iron, and determine the mixing ratio of the mixed vermicular agent; 70~75% rare earth magnesium calcium vermicular agent and 25~30% low-silicon magnesium lump spheroidizer. The measured ...

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Abstract

The invention relates to a method for vermicular cast iron by using a mixed vermiculizer, which comprises the following steps: 1) proportioning; 2) preparing the mixed vermiculizer; 3) vermiculizing; 4) carrying out secondary inoculation; 5) carrying out test sprue and quick metallographic examination; 6) removing slag for coverage; and 7) casting. The molten iron sulfur content detection determines that when a vermiculizer formed by mixing a rare-earth magnesium-calcium vermiculizer and a low-silicon magnesium conglomeration nodulizer in different ratios is used for vermiculization, after carrying out primary inoculation with a silicon-barium inoculator and secondary inoculation with a 75 iron-silicon alloy, the vermicular percentage of the prepared vermicular cast iron is greater than or equal to 85%, the pearlite content in the base is greater than or equal to 50%, the tensile strength sigma b is greater than or equal to 420Mpa, the hardness is HB175-210, and the elongation percentage delta is greater than or equal to 1.5%.

Description

technical field [0001] The invention relates to the field of cast iron processing, in particular to a detection of the sulfur content of molten iron before a furnace, and the mixing ratio of a self-made rare earth magnesium calcium vermicularizing agent and a low-silicon magnesium agglomerate spheroidizing agent to perform vermicularization treatment and secondary inoculation on molten iron. A method for stably preparing compacted graphite iron castings with high strength and high wear resistance. Background technique [0002] Vermicular graphite cast iron has both the casting performance of gray cast iron and the application performance of high strength and good toughness of ductile cast iron. Therefore, the material has good vibration damping properties, thermal conductivity, and wear resistance, and can be widely used in the manufacture of diesel engine blocks, cylinder heads, cylinder liners, brake pads and other parts. The development of the automobile industry require...

Claims

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Application Information

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IPC IPC(8): C22C33/08C22C33/10C22C37/04
Inventor 荆泽平傅明喜张军中
Owner 丹阳市锦雄机械制造有限公司
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