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Smelting method of chromium-molybdenum-copper-nickel-tin-antimony low-alloy wear-resistant cast iron

A wear-resistant cast iron and low-alloy technology, applied in the field of cast iron smelting, can solve problems such as difficulty in ensuring complete melting of alloys, unqualified metallographic structure of cast iron, and substandard mechanical properties, so as to ensure thorough melting, reduce melting time, and improve smelting efficiency effect

Inactive Publication Date: 2014-12-03
HEBEI FENGWEI MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the existing low-alloy cast iron smelting method, due to the high melting point of the alloy, it is common to add a high-melting-point alloy after the molten iron is completely melted, which prolongs the melting time and is difficult to ensure that the alloy is completely melted; The metallographic structure and mechanical properties of cast iron are not up to standard

Method used

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  • Smelting method of chromium-molybdenum-copper-nickel-tin-antimony low-alloy wear-resistant cast iron
  • Smelting method of chromium-molybdenum-copper-nickel-tin-antimony low-alloy wear-resistant cast iron

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Embodiment 1

[0016] The smelting method for making chromium, molybdenum, copper, nickel, tin, antimony low-alloy wear-resistant iron castings includes processes such as weighing furnace charge, smelting, composition adjustment, and secondary inoculation treatment in the ladle, using a 500Kg medium-frequency induction furnace for smelting, The charge used is as follows: 72% of QT12 pig iron, 28% of low-carbon steel scrap, 0.3% of 55 ferrochrome, 1.9% of 55 ferromolybdenum, and 0.35% of pure nickel; when smelting, add 1 / 2 pig iron and then add ferromolybdenum and chromium in layers For iron and nickel plates, scrap steel is added while melting, and the temperature is measured after melting. When the temperature is measured for the third time, the temperature of the molten iron reaches 1408°C. Stop the furnace and sprinkle slag removal agent to form slag and remove slag; %, 65 ferromanganese 1.2%, heat up to 1500 ℃ to make a chilled sample and send it to a direct-reading spectrometer for analy...

Embodiment 2

[0019] The smelting method for making chromium, molybdenum, copper, nickel, tin, and antimony low-alloy wear-resistant iron castings includes processes such as weighing furnace charge, smelting, composition adjustment, and secondary inoculation treatment in the ladle, using a 1000Kg medium-frequency induction furnace for smelting, The charge used is as follows: 72% of QT12 pig iron, 28% of low-carbon steel scrap, 0.3% of 55 ferrochrome, 1.9% of 55 ferromolybdenum, and 0.35% of pure nickel; when smelting, add 1 / 2 pig iron and then add ferromolybdenum and chromium in layers For iron and nickel plates, add steel scrap while melting, measure the temperature after melting, and when the temperature of molten iron reaches 1402°C, stop the furnace and sprinkle slagging agent to form slag and remove slag; after the slag removal is clean, start the electric furnace and add 0.5% of 75 ferrosilicon and 65 ferromanganese 1.2%, heat up to 1508°C to make chilled samples and send them to direc...

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Abstract

The invention discloses a smelting method of a chromium-molybdenum-copper-nickel-tin-antimony low-alloy wear-resistant cast iron, which comprises the following steps: raw material weighing: preparing and weighing raw materials and alloys according to the prescribed material specifications and weight proportion; smelting: sequentially adding the materials according to the technical charging sequence, and melting, wherein refractory molybdenum iron, chromium iron and pure nickel are added in the middle of the pig iron batch charging process, and scrap steel is added; component adjustment: adding silicon iron and manganese iron to adjust to acceptable components, heating, and adding a copper block which can be easily damaged by fire; and late inoculation in casting ladle: before tapping and after preheating the casting ladle, adding a tin block (accounting for 0.05% of the raw materials) and an antimony block (accounting for 0.01% of the raw materials) to the bottom of the ladle, and adding late inoculation silicon granules into the molten iron in the ladle in the casting process. The method solves the problem that the high-melting alloy added after all the iron liquid is completely molten is refractory, is capable of shortening the melting time and enhancing the smelting efficiency, promotes the formation of the fine lamellar pearlite, and ensures the element components, mechanical properties and metallurgical structure of the casting to simultaneously satisfy the requirements.

Description

technical field [0001] The invention belongs to the technical field of cast iron smelting, and in particular relates to a melting method of low-alloy wear-resistant cast irons such as chromium, molybdenum, copper, nickel, tin, antimony, etc., so as to ensure that the elemental components, mechanical properties and metallographic structure of castings all meet the requirements. Background technique [0002] By adding a certain proportion of alloys to gray cast iron, improving the matrix structure, refining pearlite and improving the shape of graphite lines, the mechanical properties of cast iron are effectively improved, especially the high-speed wear resistance. [0003] The content of carbon in the low-alloy wear-resistant cast iron of the present invention is 3.0-3.2%, the content of silicon is 1.5-1.8%, the content of manganese is 0.65-0.85%, the content of chromium is 0.15-0.2%, and the content of molybdenum is 0.8-1.0%. , the content of nickel is 0.3-0.4%, the content o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/08
Inventor 周校进霍志春霍顺珂徐良尉文敏马现国
Owner HEBEI FENGWEI MACHINERY
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