High-toughness and heat-resistant nodular cast iron for exhaust manifolds and preparation technology of high-toughness and heat-resistant nodular cast iron

A technology of exhaust manifold and ductile iron, which is applied in the field of high-toughness heat-resistant ductile iron and its preparation technology, can solve the problems of low fuel combustion efficiency and low power, and achieve the effect of increasing anti-bending effect and mitigating the reduction of service life Effect

Inactive Publication Date: 2020-05-12
QINGDAO TIANYING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Early automobile engines had low power per unit weight, low fuel combustion efficiency, and the exhaust gas temperature did not exceed 500°C

Method used

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  • High-toughness and heat-resistant nodular cast iron for exhaust manifolds and preparation technology of high-toughness and heat-resistant nodular cast iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, a kind of preparation method of the high-toughness heat-resistant ductile iron that is used for exhaust manifold, comprises the following steps:

[0030] Step 1: Raw material preparation: nodulizers, inoculants, low-sulfur carburizers, slag removers, and alloys are placed on site. The nodulizers use Ca and Ba-containing low rare earth nodulizers: QRMg8Re3; the inoculants use Si- Ba inoculant, the Ba content of the inoculant is 6%;

[0031] Step 2: Preparation of spheroidizing bag and pouring bag: remove the debris in the spheroidizing bag before use, and check whether the refractory material has fallen off in the pouring bag;

[0032] Step 3: Sampling and testing the molten iron after melting;

[0033] Step 4: Nodulization, agent inoculant filling, put nodulizer into the dam of the nodulization bag, cover the top with the inoculant, and then cover the top with the slag remover, put into the nodulization bag once inoculated to be 1.6% of the molten steel q...

Embodiment 2

[0038] Embodiment 2, a kind of preparation method for the high toughness heat-resistant ductile iron of exhaust manifold, comprises the following steps:

[0039] Step 1: Raw material preparation: nodulizers, inoculants, low-sulfur carburizers, slag removers, and alloys are placed on site. The nodulizers use Ca and Ba-containing low rare earth nodulizers: QRMg8Re3; the inoculants use Si- Ba inoculant, the Ba content of the inoculant is 5%; step 2: preparation of the nodularization bag and pouring bag: remove the sundries in the nodularization bag before use, and check whether the refractory material has fallen off in the pouring bag;

[0040] Step 3: Sampling and testing the molten iron after melting;

[0041] Step 4: Nodulization, agent inoculant filling, put the nodulizer into the dam of the nodulization bag, cover the above with the inoculant, and then cover the top with the slag remover, put into the nodulization bag once inoculated to be 1.3% of the molten steel quality, s...

Embodiment 3

[0044] Embodiment 3, a kind of preparation method for the high toughness heat-resistant ductile iron of exhaust manifold, comprises the following steps:

[0045] Step 1: Raw material preparation: nodulizers, inoculants, low-sulfur carburizers, slag removers, and alloys are placed on site. The nodulizers use Ca and Ba-containing low rare earth nodulizers: QRMg8Re3; the inoculants use Si- Ba inoculant, the Ba content of the inoculant is 4%;

[0046] Step 4: Nodulization, agent inoculant filling, put the nodulizer into the dam of the nodulization bag, cover the top with the inoculant, and then cover the top with the slag remover, put into the nodulization bag once inoculated to be 1% of the molten steel mass, so Said nodulizer addition (%)=30a+b, a is sulfur content in molten iron, b is coefficient, b=0.35;

[0047] Step 5: After the molten iron is poured into the spheroidizing bag, add a secondary inoculant, the secondary inoculation is 0.2 times the mass of the spheroidizing a...

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Abstract

The invention discloses high-toughness and heat-resistant nodular cast iron for exhaust manifolds and a preparation technology of the high-toughness and heat-resistant nodular cast iron. The nodular cast iron is prepared from chemical components including, by weight, 3.02%-3.28% of C, 3.85%-4.10% of Si, 0.38%-0.55% of Mn, 0.017%-0.019% of P, 0.0037%-0.0058% of S, 0.410%-0.46% of Cu, 0.40%-0.43% ofMo, 0.037%-0.058% of Mg and the balance Fe. The preparation method includes the following steps that step 1: raw materials are prepared; step 2: a spheroidizing ladle and a pouring ladle are prepared; step 3: sampling and detecting work is performed on molten iron after melting down; step 4: filling of a spheroidizing agent and a nucleating agent is performed, a dam of the spheroidizing ladle isfilled with the spheroidizing agent, the spheroidizing agent is covered with the nucleating agent, and then the nucleating agent is covered with a slag removal agent; step 5: after the molten iron ispoured into the spheroidizing ladle, the slag removal agent is scattered to the surface of the molten iron, and slagging-off and cleaning work is performed; step 6: after slagging-off of the molten iron, the molten iron is taken by a spectroscopy room for testing of components. The nodular cast iron has the excellent high-temperature shear resistance, high-temperature corrosion resistance and high-temperature toughness, the internal stress change of pipelines is small during repeated heating and cooling, and finally, the service life of the exhaust manifolds is prolonged.

Description

technical field [0001] The invention relates to the field of exhaust manifold preparation, more specifically, it relates to a high-toughness heat-resistant nodular cast iron used for the exhaust manifold and a preparation process thereof. Background technique [0002] The exhaust manifold is connected to the cylinder block of the engine, and the exhaust of each cylinder is collected and introduced into the exhaust manifold, with divergent pipelines. In the actual application process, when the automobile exhaust is too concentrated, there will be mutual interference between the cylinders, that is, when a certain cylinder exhausts, it happens to encounter the undischarged exhaust gas from other cylinders. In this way, the resistance of the exhaust will be increased, thereby reducing the output power of the engine. At the same time, the multi-directional force caused by the disorder of the multi-directional airflow will also affect the life of the exhaust manifold in a high-tem...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C22C33/08C21C1/10
CPCC21C1/105C22C33/08C22C37/04C22C37/10
Inventor 马之良李贵达杨宏
Owner QINGDAO TIANYING IND
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