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Preparation method of high-strength and high-elongation clay sand as-cast QT700-10 ductile iron casting

A high-strength, clay-sand technology, used in the preparation of high-strength clay-sand cast QT700-10 ductile iron castings, high-strength field, can solve the problem of high strength and high elongation, low yield strength technical indicators, and poor mechanical performance stability and other issues, to achieve the effect of environmental protection, little influence of human factors, and high stability of mechanical properties

Active Publication Date: 2022-05-10
山东宇信铸业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the purpose of the present invention is to provide a preparation method of high-strength, high-strength clay sand cast QT700-10 ductile iron castings, aiming to solve the current In the clay sand process technology, the production cost is high, the technical indicators such as yield strength and pearlite are low, and the technical problems of high strength and high elongation cannot be taken into account, and the stability of mechanical properties is poor

Method used

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  • Preparation method of high-strength and high-elongation clay sand as-cast QT700-10 ductile iron casting
  • Preparation method of high-strength and high-elongation clay sand as-cast QT700-10 ductile iron casting
  • Preparation method of high-strength and high-elongation clay sand as-cast QT700-10 ductile iron casting

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preparation example Construction

[0029] The invention provides a method for preparing a high-strength, high-strength clay sand-cast QT700-10 ductile iron casting, which is characterized in that it comprises the following steps:

[0030] Step 1. Add recarburizer, scrap steel briquette, furnace charge, and pretreatment agent into the intermediate frequency electric furnace by batch weighing according to the ingredient list for smelting. When it is close to the tapping temperature, take samples, analyze the composition of molten iron, and adjust the ingredients to make the composition qualified. , adjust the temperature to 1520~1550℃, keep warm for 5~8min, and remove slag several times;

[0031] Step 2. The molten iron is automatically weighed and transferred to the spheroidizing bag. Cu and Sn trace alloys are added to the spheroidizing bag for blasting. remove scum;

[0032] Step 3. The molten iron is transferred to the automatic pouring machine, and silicon barium inoculant is added for inoculation, and slag...

Embodiment 1

[0041]Raw materials such as scrap steel briquettes, returned materials, recarburizers, silicon carbide and other raw materials are weighed in batches and added to the intermediate frequency electric furnace for melting according to the batch list. When the temperature is close to the tapping temperature, samples are taken to analyze the composition of the molten iron, and the ingredients are adjusted so that the chemical composition of the original molten iron reaches: C3.73%, Si 1.4%, Mn 0.345%, P0.0234%, S0.0092%, Cu0.0658%. After the chemical composition is qualified, the electric furnace is heated up to 1528°C, and the slag is removed for 8 minutes; the molten iron is automatically weighed Re-transfer to the spheroidizing bag, add Cu and Sn trace alloys in the bag for furnace punching; after alloying, the molten iron is automatically transferred for wire feeding and spheroidizing inoculation, the spheroidizing wire and inoculating wire are inserted into the molten iron at th...

Embodiment 2

[0045] Raw materials such as scrap steel briquettes, returned materials, recarburizers, silicon carbide and other raw materials are weighed in batches and added to the intermediate frequency electric furnace for melting according to the batch list. When the temperature is close to the tapping temperature, samples are taken to analyze the composition of the molten iron, and the ingredients are adjusted so that the chemical composition of the original molten iron reaches: C3.73%, Si 1.4%, Mn 0.345%, P0.0234%, S0.0092%, Cu0.0658%, after the chemical composition is qualified, the temperature is raised to 1535°C, and the slag is removed for 6 minutes; the molten iron is automatically weighed Transfer to the spheroidizing bag, add Cu and Sn trace alloys in the bag for furnace punching; after alloying, the molten iron is automatically transferred for wire feeding and spheroidizing inoculation, the spheroidizing wire and inoculating wire are inserted into the molten iron at the same tim...

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Abstract

The invention relates to the technical field of casting technologies and new materials, in particular to a preparation method of a high-strength and high-elongation clay sand as-cast QT700-10 ductile iron casting, which comprises the following steps: step 1, weighing a carburant, a scrap steel briquette, foundry returns and a pretreating agent in batches according to a batching list, adding the weighed materials into an electric furnace for smelting, sampling, analyzing the components of molten iron, adjusting the components to be qualified, and taking out the molten iron; keeping the temperature at 1520-1550 DEG C for 5-8 minutes, and slagging off; 2, molten iron is weighed and transferred to a spheroidizing bag, Cu and Sn micro-alloy is added for discharging and flushing, meanwhile, a spheroidizing line and an inoculation line are inserted for wire feeding spheroidizing inoculation, and scum is removed after completion of wire feeding spheroidizing inoculation; 3, the molten iron is transferred to a casting machine, a silicon-barium inoculant is added for ladle-to-ladle inoculation, and slag removal and temperature measurement are conducted after ladle-to-ladle inoculation is completed; 4, the automatic casting machine is started, an efficient inoculant is added, and stream inoculation is carried out; and 5, after pouring is finished, heat preservation is conducted for 2-4 h, box pushing and shakeout are conducted, the metallographic phase and performance of a casting are detected to be qualified, and a qualified casting is obtained. The requirements of mechanical parts for high-strength and high-toughness ductile iron castings and the requirement for light weight of automobile parts can be met.

Description

technical field [0001] The invention relates to the field of casting technology and new material technology, in particular to a method for preparing a QT700-10 ductile iron casting with high strength and high elongation in clay sand cast state. Background technique [0002] Ductile iron castings are widely used in industrial production as important engineering materials due to their good mechanical properties and castability. The latest national standard GB / T1348-2019 "Ductile Iron Castings" stipulates a total of 14 grades of ferritic pearlitic ductile iron QT350-22L to QT900-2 and solid solution strengthened ferritic ductile iron QT450-18 to QT600 -10 has three grades in total, all of which are low-strength and high-strength or high-strength and low-stretch. With the continuous emergence of new technologies and materials in recent years, especially the needs of energy saving, emission reduction and environmental protection, commercial vehicles are moving toward heavy load, ...

Claims

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Application Information

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IPC IPC(8): C22C33/08B22D1/00C21C1/10
CPCC22C33/08C21C1/10B22D1/007Y02P10/20
Inventor 张怀嵩陈中辉陈庚
Owner 山东宇信铸业有限公司
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