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Tin and niobium composite alloying gray pig iron and production process thereof

A composite alloy and production process technology, applied in the field of casting alloys, can solve the problems of easy occurrence of hot cracks, poor thermal conductivity, and low carbon equivalent of gray cast iron, and achieve the effects of improving strength and increasing pearlite content.

Inactive Publication Date: 2014-06-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN101781734A discloses a vanadium-titanium cast iron for brake drums. In this solution, gray cast iron has low carbon equivalent, relatively poor thermal conductivity, and is prone to thermal cracks; patent CN101586206A discloses a copper-chromium-high-silicon alloy gray cast iron

Method used

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  • Tin and niobium composite alloying gray pig iron and production process thereof
  • Tin and niobium composite alloying gray pig iron and production process thereof
  • Tin and niobium composite alloying gray pig iron and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A formula of tin-niobium composite alloyed gray cast iron of the present invention is: C: 3.82%, Si: 1.97%, Mn: 0.68%, P: 0.05%, S: 0.05%, Sn: 0.058%, Nb: 0.19%, Fe balance

[0018] The production process of this gray cast iron includes the following steps:

[0019] (1) Alloy smelting: cast pig iron, low and medium carbon carbon steel scrap, recycled similar cast iron, pure tin, ferromanganese, ferroniobium, etc. are used as raw materials

[0020] Alloy cast iron is smelted in a conventional intermediate frequency induction furnace. First, cast pig iron, low and medium carbon carbon scrap steel, and recycled similar cast iron are added to the furnace. Then raise the temperature to 1400°C~1430°C, adjust the composition according to the test results of the molten iron composition in the furnace, after adjusting the composition, raise the temperature of the molten iron to 1490°C-1540°C, after melting all the raw materials, keep them in the furnace for 10-20 minutes to mak...

Embodiment 2

[0024] A formula of tin-niobium composite alloyed gray cast iron of the present invention is: C: 3.78%, Si: 2.48%, Mn: 0.66%, P: 0.04%, S: 0.06%, Cu: 0.41%, Cr: 0.33%, Sn: 0.037%, Nb: 0.12%, Fe balance. (Cu and Cr are added to the furnace together with the cold material, and other production processes are the same as in Example 1)

Embodiment 3

[0026] A formula of tin-niobium composite alloyed gray cast iron of the present invention is: C: 3.86%, Si: 2.15%, Mn: 0.64%, P: 0.05%, S: 0.06%, Cu: 0.45%, Cr: 0.29%, V: 0.06%, Ti: 0.07%, Sn: 0.029%, Nb: 0.094%, Fe balance. (Cu and Cr are added into the furnace together with the cold material, V and Ti alloys are added into the furnace 10-15 minutes before being released from the furnace, and other production processes are the same as in Example 1)

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Abstract

The invention discloses tin and niobium composite alloying gray pig iron which comprises the following elements in percentage by weight: 3.5-4.0% of C, 1.8-2.8% of Si, 0.6-1.0% of Mn, 0.02-0.08% of P, 0.02-0.10% of S, 0.02-0.10% of Sn, 0.07-0.40% of Nb and the balance of Fe. According to performance requirements, one or more following elements can be added: 0.3-0.8% of Cu, 0.2-0.7% of Cr, 0.2-2.0% of Ni, 0.2-1.0% of Mo, 0.01-0.07% of V and 0.01-0.07% of Ti. According to the gray pig iron, Sn and Nb alloys are compositely added, so that graphite and pearlite in the cast iron are remarkably refined, and the content of the pearlite is increased to over 98%, thereby remarkably improving the hardness, compressive strength and elasticity modulus of the cast iron. The tin and niobium composite alloying gray pig iron can be used for brake discs, air cylinder covers of engines and piston rings of top grade automobiles and is stable in performance and low in cost.

Description

technical field [0001] The invention relates to a tin-niobium composite alloyed gray cast iron, which belongs to the field of casting alloys. Background technique [0002] Gray cast iron has excellent casting performance, cutting performance, wear resistance and heat resistance, shock absorption performance and low cost, and is widely used in various sectors of machinery manufacturing, metallurgy, petrochemical, transportation, construction and national defense industries. [0003] Wear is one of the three main forms of failure of mechanical parts (wear, corrosion, fracture). According to a large number of statistics, more than 80% of damaged parts are directly or indirectly caused by wear and tear. Compared with other metal materials, gray cast iron has a good anti-friction effect, because graphite itself acts as a lubricant during friction, and in the case of lubricating oil, the graphite flakes can store lubricating oil, ensuring The continuity of the oil film. Therefo...

Claims

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Application Information

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IPC IPC(8): C22C37/10
Inventor 黄维刚秦英黄雪飞
Owner SICHUAN UNIV
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