A kind of high elongation rut400 vermicular graphite cast iron and its production process

A high elongation, vermicular graphite cast iron technology, applied in the direction of improving process efficiency, can solve the problems of reduced tensile strength, inability to meet the requirements of vermicular iron grades, etc., and achieves easy operation, high tensile strength, and simple process. Effect

Active Publication Date: 2021-11-23
锦州捷通铁路机械股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the elongation is inversely proportional to the tensile strength, the elongation increases, but the tensile strength decreases, which cannot meet the requirements of its vermicular grade.

Method used

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  • A kind of high elongation rut400 vermicular graphite cast iron and its production process
  • A kind of high elongation rut400 vermicular graphite cast iron and its production process
  • A kind of high elongation rut400 vermicular graphite cast iron and its production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Ingredients Weighing raw materials for molten iron smelting:

[0042] The raw materials for hot metal smelting are composed of the following components by weight percentage: pig iron 0.715t, scrap steel 0.285t, ferrosilicon 3.5kg, recarburizer 4kg;

[0043] a. Pig iron is high-purity pig iron, and its composition mass percentages are as follows:

[0044] C(％) Si(%) Mn(%) P(％) S(％) Ti(%) ≥4.0 ≤0.4 ≤0.5 ≤0.025 ≤0.02 ≤0.03

[0045] The mass percentages of trace elements in pig iron are as follows:

[0046]

[0047] The balance is iron;

[0048] b. Scrap steel is carbon steel, and the mass percentages of the components are as follows:

[0049] C(％) Si(%) Mn(%) P(％) S(％) ≤0.3 ≤0.2 ≤0.3 ≤0.02 ≤0.015

[0050] The balance is iron;

[0051] c. The grade of ferrosilicon is FeSi75-B according to the GB2272-87 standard;

[0052] (2) Smelting molten iron

[0053] Put the molten iron smelting raw materials into an i...

Embodiment 2

[0071] (1) Ingredients Weighing raw materials for molten iron smelting:

[0072] The raw materials for hot metal smelting are composed of the following components by weight percentage: pig iron 0.72t, scrap steel 0.28t, ferrosilicon 3.4kg, recarburizer 4kg;

[0073] a. Pig iron is high-purity pig iron, and its composition mass percentages are as follows:

[0074] C(％) Si(%) Mn(%) P(％) S(％) Ti(%) ≥4.0 ≤0.4 ≤0.5 ≤0.025 ≤0.02 ≤0.03

[0075] The mass percentages of trace elements in pig iron are as follows:

[0076]

[0077] The balance is iron;

[0078] b. Scrap steel is carbon steel, and the mass percentages of the components are as follows:

[0079] C(％) Si(%) Mn(%) P(％) S(％) ≤0.3 ≤0.2 ≤0.3 ≤0.02 ≤0.015

[0080] The balance is iron;

[0081] c. The grade of ferrosilicon is FeSi75-B according to the GB2272-87 standard;

[0082] (2) Smelting molten iron

[0083] Put the molten iron smelting raw materials into the in...

Embodiment 3

[0101] (1) Ingredients Weighing raw materials for molten iron smelting:

[0102] The raw materials for hot metal smelting are composed of the following components by weight percentage: pig iron 0.718t, scrap steel 0.282t, ferrosilicon 3.5kg, recarburizer 4kg;

[0103] a. Pig iron is high-purity pig iron, and its composition mass percentages are as follows:

[0104] C(％) Si(%) Mn(%) P(％) S(％) Ti(%) ≥4.0 ≤0.4 ≤0.50 ≤0.025 ≤0.02 ≤0.03

[0105] The mass percentages of trace elements in pig iron are as follows:

[0106]

[0107] The balance is iron;

[0108] b. Scrap steel is carbon steel, and the mass percentages of the components are as follows:

[0109] C(％) Si(%) Mn(%) P(％) S(％) ≤0.3 ≤0.2 ≤0.3 ≤0.02 ≤0.015

[0110] The balance is iron;

[0111] c. The grade of ferrosilicon is FeSi75-B according to the GB2272-87 standard;

[0112] (2) Smelting molten iron

[0113] Put the molten iron smelting raw materials into an ...

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Abstract

A kind of high-elongation RuT400 vermicular graphite cast iron and its production process, using pig iron, scrap steel, nickel, ferrosilicon, recarburizer, or pig iron, recycled material, scrap steel, recarburizer as raw materials, put it into an intermediate frequency furnace for smelting , get qualified molten iron, add recarburizer and take it out of the furnace; carry out baking operation on the spheroidizing treatment bag, fill in vermicularizing agent, inoculant and iron filings to keep warm, pour molten iron into the vermicularizing treatment bag, when the vermicularizing treatment bag When the amount of molten iron poured into the medium accounts for 2/3 of the total mass of molten iron, add an inoculant for secondary inoculation, and continue to pour in the remaining molten iron; flow inoculant to obtain vermicular graphite cast iron. The advantages are: simple process and easy operation. The obtained vermicular graphite cast iron has a tensile strength of more than 400MPa, a yield strength of more than 300MPa, and a breaking elongation of more than 2.5%. Its elongation at break is more than 2.5 times that required by the national standard RuT400A.

Description

technical field [0001] The invention relates to a high-elongation RuT400 vermicular graphite cast iron and a production process thereof. Background technique [0002] Vermicular graphite cast iron has excellent comprehensive mechanical properties, and its shock absorption, thermal conductivity, thermal fatigue resistance and wear resistance are all better than nodular cast iron with the same tensile strength. Vermicular graphite cast iron can be widely used in automobile engines, exhaust pipes, diesel engine cylinder heads, brake parts, etc. [0003] At present, the elongation of RuT compacted graphite cast iron is mostly between 1% and 2%. RuT400 vermicular graphite cast iron grade stipulates that the tensile strength of the material shall not be lower than 400MPa, the yield strength shall be greater than 280MPa, and the elongation shall not be less than 1%. RuT400 compacted graphite cast iron. However, the metal material with better elongation is more conducive to the fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C33/10C21C1/08B22D1/00C21D1/28C21D5/00
CPCB22D1/007C21C1/08C21D1/28C21D5/00C22C33/10C22C37/10Y02P10/20
Inventor 苗昕旺石强孙海清宋佳健王树峰胡野孟庆权任凤华孙明臧玉郡
Owner 锦州捷通铁路机械股份有限公司
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