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Casting technology of low-temperature and high-tenacity spheroidal graphite cast iron butterfly valve containing carbides

A technology of ductile cast iron and casting technology, applied in the field of casting technology, can solve problems such as easy shrinkage, unqualified material, failure to reach customers, etc., achieve outstanding mechanical properties, excellent metallographic detection indicators, and high impact fatigue life Effect

Inactive Publication Date: 2017-02-22
CHANGZHOU HONGSHENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, when many production plants produce this type of casting, the process is unstable, and it is prone to unqualified materials such as unqualified tensile strength and low-temperature impact energy, and internal defects such as shrinkage and porosity, which cannot meet the requirements of the standard, resulting in batches of waste products.
Failure to meet customer requirements, resulting in claims and other losses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Melting process

[0034] 1. Prepare materials

[0035] According to the mass percentage of the elements C3.5%, Si2.8%, Mn≤0.2%, P≤0.05%, Cr0.6%, 41% of returned charge, 1.0% of recarburizer, 0.1% of silicon carbide, and the rest is prepared by Fe raw material;

[0036] 2. Melting

[0037] Put the prepared raw materials into the electric furnace, heat up and melt, put the silicon carbide and the returned material in step 1) into the electric furnace in turn for 1-2 minutes after melting, and form the original molten iron after all the raw materials are melted; the temperature out of the furnace is controlled at 1560°C ; Two) spheroidization and inoculation process

[0038] 1. The dam-type spheroidizing ladle is preheated by molten iron;

[0039] 2. Put the nodulizer into the bottom of the nodularization bag, and cover the 2mm thick silicon-barium-calcium inoculant, then cover the iron filings processed by the nodular cast iron machine, then compact it, and finally...

Embodiment 2

[0052] 1) Melting process

[0053] 1. Prepare materials

[0054] According to the mass percentage of the elements C3.9%, Si3.8%, Mn≤0.4%, P≤0.07%, Cr1.5%, 49% of returned charge, 2.0% of recarburizer, 0.3% of silicon carbide, and the rest is prepared by Fe raw material;

[0055] 2. Melting

[0056] Put the prepared raw materials into the electric furnace, heat up and melt, put the silicon carbide and the returned material in step 1) into the electric furnace in turn after 2 minutes of melting, and form the original molten iron after all the raw materials are melted; the furnace temperature is controlled at 1600 °C;

[0057] 2) Spheroidization and inoculation process

[0058] 1. The dam-type spheroidizing ladle is preheated by molten iron;

[0059] 2. Put nodulizing agent into the bottom of the nodularizing bag, and cover with 3mm thick silicon-barium-calcium inoculant, then cover the iron filings machined by ductile iron, then tamp, and finally cover the nodular cast iron ...

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Abstract

The invention provides a casting technology of a low-temperature and high-tenacity spheroidal graphite cast iron butterfly valve containing carbides and belongs to the technical field of casting technologies. The spheroidal graphite cast iron butterfly valve with high impact tenacity, high wear resistance and long impact fatigue life is obtained through smelting, spheroidization, pouring, box pulling and heat treatment.

Description

technical field [0001] The invention relates to the technical field of casting technology, in particular to a casting technology for a carbide-containing low-temperature high-toughness nodular cast iron butterfly valve. Background technique [0002] The material of the butterfly valve body is QT400-18L (GB1348-2009); foreign standards: [0003] EN-GJS-400-18LT (DINEN1563-2012); Material requirements: 1. Tensile strength ≥ 400MPa; 2. Elongation ≥ 18%; 3. The average impact energy of 3 samples at -20°C ≥ 14J and a single test The value is not less than 12J (the last type of body sampling); 4. The interior of the valve body is required to have no casting defects such as shrinkage and porosity, and the "X" ray inspection does not exceed level 3. It is especially used in the field of fluid (water, gas, oil) pipeline transportation system and chemical and pharmaceutical fields to control the flow rate and cut-off butterfly valve. Because the working environment is more used in l...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/06C22C37/04C22C33/08C21C1/10C21D5/00
CPCC22C37/10C21C1/10C21D5/00C21D2211/001C21D2211/006C21D2211/008C22C33/08C22C37/04C22C37/06
Inventor 陈富文
Owner CHANGZHOU HONGSHENG TECH CO LTD
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