Eutectic graphite gray cast iron continuous casting profile and manufacturing method thereof

A technology of gray cast iron and profiles, applied in the field of casting, can solve problems such as the uniformity of cross-sectional hardness, unstable drawing state, and low tensile strength, so as to improve oil and gas leakage resistance, tensile strength and cross-section The uniformity of hardness is improved and the effect of uniform hardness

Inactive Publication Date: 2015-08-05
沈阳华铸科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing cast iron horizontal continuous casting method has low production efficiency and unstable drawing state
The tensile strength of existing gray cast iron continuous casting profiles is low, and the uniformity of cross-section hardness needs to be improved

Method used

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  • Eutectic graphite gray cast iron continuous casting profile and manufacturing method thereof
  • Eutectic graphite gray cast iron continuous casting profile and manufacturing method thereof
  • Eutectic graphite gray cast iron continuous casting profile and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The preparation technology of profile of the present invention is as follows:

[0015] Smelting process: dual smelting with power frequency induction furnace and cupola. The raw iron is smelted by fast thermal analyzer and spectrum control in front of the furnace and adjusted in time. 75% ferrosilicon inoculant, the particle size of the inoculant is 0.5mm, the amount of inoculant added is 0.6% of the molten iron mass, and the carbon equivalent of the molten iron after inoculation is controlled at 4.32; molten iron spectral analysis: determine C, Si, Mn, P, S, Ti Content, according to the cross section of the profile and the performance requirements, adjust the carbon equivalent and C, Si, Mn, P, S, Ti, the appropriate amount according to the mechanical properties of the profile and the matrix structure. The amount of each raw material is shown in Table 3.

[0016] The continuous casting profile drawing process is carried out, and the continuous casting profile is manufa...

Embodiment 2

[0024] The preparation technology of profile of the present invention is as follows:

[0025] Smelting process: dual smelting with power frequency induction furnace and cupola, the content of the original molten iron is controlled by rapid thermal analyzer and spectrum in front of the furnace and adjusted in time. Ordinary 75% ferrosilicon inoculant, the particle size of the inoculant is 12mm, the amount of inoculant added is 1.0% of the mass of molten iron, and the carbon equivalent of molten iron after inoculation is controlled at 4.38;

[0026] Spectral analysis of molten iron: determination of C, Si, Mn, P, S, Ti content,

[0027] According to the cross-section and service performance requirements of the profile, adjust the carbon equivalent and the appropriate amount of C, Si, Mn, P, S, Ti based on the mechanical properties of the profile and the matrix structure. The amount of each raw material is shown in Table 4.

[0028] The continuous casting profile drawing process...

Embodiment 3

[0033] The preparation technology of profile of the present invention is as follows:

[0034] Smelting process: dual smelting with power frequency induction furnace and cupola, the content of the original molten iron is controlled by rapid thermal analyzer and spectrum in front of the furnace and adjusted in time. Ordinary 75% ferrosilicon inoculant, the particle size of the inoculant is 0.5mm, the amount of inoculant added is 0.7% of the mass of molten iron, and the carbon equivalent of molten iron after inoculation is controlled at 4.20;

[0035] Spectral analysis of molten iron: determination of C, Si, Mn, P, S, Ti content,

[0036] According to the cross-section and performance requirements of the profile, adjust the carbon equivalent and the appropriate amount of C, Si, Mn, P, S, Ti based on the mechanical properties of the profile and the matrix structure. The amount of each raw material is shown in Table 5.

[0037] The continuous casting profile drawing process is car...

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Abstract

The invention discloses a cast iron continuous-cast section material and a manufacturing method thereof, in particular relates to an eutectic graphite grey cast iron continuous-cast section material and the manufacturing method thereof, and belongs to the field of the casting technique. The eutectic graphite grey cast iron continuous-cast section material is prepared from the following raw materials by mass percent: 3.40% to 3.60% of C, 2.4% to 2.9% of Si, 0.6% to 1.0% of Mn, 0.08% to 0.15% of P, less than or equal to 0.07% of S, 0.06% to 0.20% of Ti, 0.3% to 0.80% of Cu and 91.5% to 93% of Fe, wherein the total amount of the raw materials accounts for 100%. The prepared section material is excellent in surface roughness and free of generating shrinkage holes, shrinkage porosity and air holes. The structures, from the center to the edge, of the section material, are uniform and dense. The section material has the characteristics of being high in strength and uniform in hardness. The tensile strength and the uniformity of the section hardness of the material section disclosed by the invention are improved greatly.

Description

technical field [0001] The invention relates to a cast iron continuous casting profile and a manufacturing method thereof, in particular to a eutectic graphite gray cast iron continuous casting profile and a manufacturing method thereof, belonging to the technical field of casting. Background technique [0002] my country's cast iron horizontal continuous casting technology started relatively late. Since the development of horizontal continuous casting of cast iron profiles, the production of ordinary gray cast iron profiles is to add an appropriate amount of inoculants to molten iron with low carbon equivalent composition. It is difficult to improve the mechanical properties simply by reducing the carbon equivalent, and there is a limit to the reduction of C and Si content. If the content is too low, cementite will form pitted white structure. If the content of C and Si is too high, the strength performance will be affected, and the graphite structure will be coarse. The e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10
Inventor 胡迪崔秀华
Owner 沈阳华铸科技有限公司
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