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A ferrite-based nodular cast iron material with thick and large cross-section and its melting method

A large-section, ferrite technology, applied in the field of ferroalloy smelting, can solve the problems of low pass rate of ultrasonic flaw detection, poor nodularization rate of large-section ductile iron, uneven matrix structure, etc.

Active Publication Date: 2021-06-15
SHANNXI DIESEL ENGINE HEAVY IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides a ferrite-based nodular cast iron material with thick and large cross-section and its smelting method, which improves the smelting process, solves the poor spheroidization rate of large-section nodular cast iron, uneven matrix structure, and solves the shrinkage cavity and shrinkage of castings. Problems such as low pass rate of magnetic particle flaw detection and ultrasonic flaw detection

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  • A ferrite-based nodular cast iron material with thick and large cross-section and its melting method
  • A ferrite-based nodular cast iron material with thick and large cross-section and its melting method
  • A ferrite-based nodular cast iron material with thick and large cross-section and its melting method

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] Please refer to figure 1 , the present invention provides a method for smelting ferrite-based nodular cast iron materials with thick and large sections, which adopts the following technical scheme:

[0031] It includes the following steps:

[0032] S1: Prepare raw materials;

[0033] 60% to 80% of high-purity pig iron, 10% to 25% of low-manganese carbon steel scrap, and 10% to 25% of recycled materials;

[0034] S2: smelting;

[0035] The smelting process is kept continuous so that the raw materials are melted rapidly; the smelting temperature is 1320°C to 1375°C;

[0036] S3: deterioration treatment;

[0037] After the chemical composition of the molten iron in the furnace reaches the preset value, the temperature in the furnace is raised to 1450 ° C ~ 1475 ° C;

[0038] S4: ladle processing;

[0039] Please refer to figure 2 , pure ant...

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Abstract

The invention discloses a method for smelting ferrite-based nodular cast iron materials with thick and large sections, wherein the smelting method comprises the following steps: S1: preparing raw materials; S2: smelting; S3: modification treatment; S4: ladle treatment; Iron pouring. The pass rate of the large thick and large-section ductile iron of the present invention reaches 95% through magnetic particle flaw detection and ultrasonic flaw detection, and the spheroidization rate reaches more than 85% at a wall thickness of 200mm after casting body dissection or body sampling, and the matrix structure is uniform.

Description

technical field [0001] The invention relates to the technical field of iron alloy smelting, in particular to a ferrite-based nodular cast iron material with thick and large section and a smelting method thereof. Background technique [0002] Large-tonnage, thick and large-section ductile iron generally refers to pouring liquid weight greater than 10 tons, wall thickness not less than 100mm, ferrite matrix means that the matrix structure is ferrite, pearlite content is less than 15%, and phosphorus eutectic carbide is less than 1% . Due to the high heat storage capacity of large-tonnage molten iron, the thick wall thickness of castings, and the long solidification time, there will be a decline in spheroidization incubation, enrichment of anti-spheroidization trace elements, deterioration of graphite morphology, and variation in matrix structure. Ductile iron castings , when the weight and wall thickness gradually increase, there will be graphite floating in the slow solidifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/04C22C33/08C22C37/10C21C1/10
CPCC21C1/105C22C33/08C22C37/04C22C37/10Y02P10/20
Inventor 王敏刚郭敏刘海
Owner SHANNXI DIESEL ENGINE HEAVY IND