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A kind of medium silicon molybdenum niobium ductile iron material and preparation method thereof

A technology of nodular cast iron and silicon molybdenum, which is applied in the field of nodular cast iron materials and its preparation, can solve problems such as large cost differences, achieve the effects of increasing strength, increasing tensile strength and yield strength, and improving spheroidization

Active Publication Date: 2018-03-02
西峡县内燃机进排气管有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing problems in the existing technology are: the working temperature of the exhaust manifold made of medium silicon molybdenum ductile iron is ≤760°C, the working temperature of the high nickel austenitic ductile iron is ≤880°C, and the exhaust manifold of the two materials There is a big difference in cost, so between 760 and 880°C, there is a lack of a cast iron material that can be applied to the exhaust manifold and has an affordable cost

Method used

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  • A kind of medium silicon molybdenum niobium ductile iron material and preparation method thereof
  • A kind of medium silicon molybdenum niobium ductile iron material and preparation method thereof
  • A kind of medium silicon molybdenum niobium ductile iron material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] 1. A medium-silicon-molybdenum-niobium ductile iron material, including the following chemical composition in mass percentage: C 2.86%, Si 4.4%, Mn 0.3%, P 0.032%, S 0.006%, Mo 0.82%, Ni 0.69%, Nb 0.67%, Mg 0.047%, V 0.24%, and the balance is Fe and unavoidable other elements.

[0035] Its preparation method comprises the following preparation steps:

[0036] (1) Batching process: The selected raw materials and the quality ratio of raw materials are 39.3% of C04 high-purity pig iron, 54% of steel scrap, 1% of recarburizer, 0.7% of silicon carbide, 1.5% of molybdenum-iron alloy, 1.2% of niobium-iron alloy, and 0.8% of nickel plate %, ferrosilicon alloy 1.2%, vanadium iron alloy 0.3%;

[0037] Among them, the ferromolybdenum alloy is FeMo55-A molybdenum ferroalloy, the niobium ferroalloy is FeNb60-A niobium ferroalloy, and the vanadium ferroalloy is FeV50-A; the carbon content of the carburizer is ≥98%, the particle size is 2-6mm, and the nodulizer is FeSiMg6Re2 nodulize...

Embodiment 2

[0043] 1. A medium-silicon-molybdenum-niobium ductile iron material, including the following chemical composition in mass percentage: C 3.2%, Si 4.2%, Mn 0.28%, P 0.005%, S 0.012%, Mo 0.8%, Ni 0.9%, Nb 0.4%, Mg 0.03%, V 0.17%, the balance is Fe and other unavoidable elements.

[0044] Its preparation method comprises the following preparation steps:

[0045] (1) Batching process: The selected raw materials and the quality ratio of raw materials are 45% of C04 high-purity pig iron, 48% of steel scrap, 0.6% of recarburizer, 1.2% of silicon carbide, 1.5% of molybdenum-iron alloy, 1.4% of niobium-iron alloy, and 0.8% of nickel plate %, ferrosilicon alloy 1%, vanadium iron alloy 0.5%;

[0046] Among them, the ferromolybdenum alloy is FeMo55-A molybdenum ferroalloy, the niobium ferroalloy is FeNb60-A niobium ferroalloy, and the vanadium ferroalloy is FeV50-A; the carbon content of the carburizer is ≥98%, the particle size is 2-6mm, and the nodulizer is FeSiMg6Re2 nodulizer, The pa...

Embodiment 3

[0052] 1. A medium-silicon-molybdenum-niobium ductile iron material, including the following chemical composition in mass percentage: C 2.8%, Si 4.5%, Mn 0.1%, P 0.04%, S 0.015%, Mo 0.84%, Ni 0.6%, Nb 0.7%, Mg 0.004%, V 0.15%, the balance is Fe and other unavoidable elements.

[0053] Its preparation method comprises the following preparation steps:

[0054] (1) Batching process: The selected raw materials and the quality ratio of raw materials are 37% of C04 high-purity pig iron, 55% of steel scrap, 1.2% of recarburizer, 1.2% of silicon carbide, 2% of molybdenum-iron alloy, 1.1% of niobium-iron alloy, and 0.6% of nickel plate %, ferrosilicon alloy 1.4%, vanadium iron alloy 0.5%;

[0055] Among them, the ferromolybdenum alloy is FeMo55-A molybdenum ferroalloy, the niobium ferroalloy is FeNb60-A niobium ferroalloy, and the vanadium ferroalloy is FeV50-A; the carbon content of the carburizer is ≥98%, the particle size is 2-6mm, and the nodulizer is FeSiMg6Re2 nodulizer, The pa...

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Abstract

The invention discloses a medium silicon molybdenum niobium spheroidal graphite cast iron material and a preparation method thereof. The medium silicon molybdenum niobium spheroidal graphite cast iron material is prepared from the following chemical components in percentage by mass: 2.8-3.2% of C, 4.2-4.5% of Si, less than or equal to 0.4% of Mn, less than or equal to 0.04% of P, less than or equal to 0.015% of S, 0.8-0.9% of Mo, 0.6-0.9% of Ni, 0.4-0.7% of Nb, 0.03-0.06% of Mg, 0.15-0.25% of V and the balance of Fe and inevitable other elements. Since C04 high-purity pig iron and waste steel are taken as raw materials, a medium-frequency induction furnace is adopted for smelting, and a carburant, silicon carbide, ferrocolumbium, nickel plates, ferrosilicon and ferrovanadium are added in different time phases of smelting, raw iron chemical components and smelting temperature expected by design can be achieved, and the product disclosed by the invention can be prepared through nodulization and two times of inoculation. By adopting the edium silicon molybdenum niobium spheroidal graphite cast iron material disclosed by the invention, an exhaust manifold of an engine can work under a working condition of about 800 DEG C, the high-temperature use property of the exhaust manifold can be improved, and the service life of the exhaust manifold can be prolonged.

Description

technical field [0001] The invention relates to a nodular cast iron material and a preparation method thereof, in particular to a medium silicon molybdenum niobium nodular cast iron material and a preparation method thereof. Background technique [0002] Exhaust manifold is an important part of automobile internal combustion engine. It is a part that continuously operates at high temperature, must withstand the repeated action of high temperature gas, and is difficult to achieve forced cooling. With the advancement of science and technology, the automotive industry has increasingly strict requirements on energy saving and emission reduction. Over the years, the research work on improving the fuel combustion efficiency of internal combustion engines and reducing harmful gas emissions has never stopped. Due to the gradual increase in exhaust temperature, the material of the exhaust manifold has undergone frequent updates and replacements. The failure of the exhaust manifold m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C33/08
CPCC22C33/08C22C37/04C22C37/10
Inventor 柴西成张翼任豹子田书涛史玉锋李小娟
Owner 西峡县内燃机进排气管有限责任公司
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