Gray cast iron and production technology thereof

A technology of gray cast iron and technology, applied in the field of gray cast iron and its production technology, can solve problems such as easy cracking, strength that cannot meet actual needs, and limited use range, etc., and achieve the effect of not easy cracking, good casting performance, strength and hardness improvement

Inactive Publication Date: 2013-01-16
HUBEI JIANGHAN HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a gray cast iron with excellent performance and its production process, so as to solve the technical problems of the existing gray cast iron castings, such as that the strength cannot meet the actual demand, easy to crack, and the scope of use is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Put the iron raw material (P≤0.1%, S≤0.1%) into the cupola, raise the temperature to 1450-1480°C, after the raw material is completely liquefied, add 2.85% of C, 1.05% of Mn, 1.25% of Ni, 0.4% Cr, 0.4% Sn. Continue to heat up to 1520°C, feed 1.8% cored wire (Ca6.5%, Si37.5%, light rare earth 18%, Zr2.8%, Ti4%, Ta4%, the balance is iron and unavoidable impurities , the composition of the cored wire light rare earth is Ce51%, La29%, Nd13%, Pr4.5%, Sm1.3%, Y1.2%), and then pour the molten iron into the ladle.

[0024] According to the GB / T9394 gray iron casting standard, the molten iron obtained in Example 1 was used to make a single-cast test bar, and the test bar was subjected to tensile test and hardness test. The minimum tensile strength was 378Mpa, and the Brinell hardness (HBW) was 246.

Embodiment 2

[0025] Example 2: Put the iron raw material (P≤0.1%, S≤0.1%) into the cupola, raise the temperature to 1450-1480°C, after the raw material is completely liquefied, add 2.7% of C, 0.9% of Mn, 1% of Ni, 0.3% Cr, 0.3% Sn. Continue to heat up to 1520°C, feed 1.6% cored wire (Ca5%, Si35%, light rare earth 16%, Zr2.1%, Ti3%, Ta3%, the balance is iron and unavoidable impurities, of which light rare earth The composition is Ce51%, La29%, Nd13%, Pr4.5%, Sm1.3%, Y1.2%), and then pour the molten iron into the ladle. .

[0026] According to the GB / T9394 gray iron casting standard, the molten iron obtained in Example 2 was used to make a single-cast test bar, and the test bar was subjected to tensile test and hardness test. The minimum tensile strength was 363Mpa, and the Brinell hardness (HBW) was 225.

Embodiment 3

[0027] Example 3: Put the iron raw material (P≤0.1%, S≤0.1%) into the cupola, raise the temperature to 1450-1480°C, after the raw material is completely liquefied, add 3% C, 1.2% Mn, 1.5% Ni, 0.5% Cr, 0.5% Sn. Continue to heat up to 1520 ° C, feed 2.0% cored wire (Ca8%, Si40%, light rare earth 20%, Zr3.5%, Ti5%, Ta5%, the balance is iron and unavoidable impurities, of which light rare earth The composition is Ce51%, La29%, Nd13%, Pr4.5%, Sm1.3%, Y1.2%), and then pour the molten iron into the ladle.

[0028] According to the GB / T9394 gray iron casting standard, the molten iron obtained in Example 3 was used to make a single-cast test bar, and the test bar was subjected to tensile test and hardness test. The minimum tensile strength was 390Mpa, and the Brinell hardness (HBW) was 265.

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Abstract

The invention relates to gray cast iron which is prepared by the following ingredients according to mass percent: 2.7 to 3.0 percent of C, 0.9 to 1.2 percent of Mn, 1 to 1.5 percent of Ni, 0.3 to 0.5 percent of Cr, 0.3 to 0.5 percent of Sn, 1.6 to 2.0 percent of core-spun yarns, not higher than 0.1 percent of P, not higher than 0.1 percent of S, and the balance ofiron and inevitable impurities. Powdery inner cores of the core-spun yarns contain light rare earth. Through the reasonable regulation of the proportioning of raw materials of the gray cast iron and the addition of inoculation, the strength and hardness of the gray cast iron are obviously improved. The gray cast iron is convenient in smelting and outstanding in casting property. After inoculation, the cast iron piece cannot be easily fractured. The gray cast iron casting smelted by the current materials has obviously-improved pressure resistant strength and hardness, lowers the production cost of the enterprise, increases the qualification rate of the product, enlarges the application scope of the casting, and has obvious economic benefits.

Description

technical field [0001] The invention relates to a cast iron material, in particular to a gray cast iron and a production process thereof. Background technique [0002] The iron-carbon alloy with a carbon content greater than 2.11% is called cast iron. The classification of commonly used cast iron can be divided into gray cast iron, nodular cast iron, and vermicular cast iron according to the different forms of carbon. Most or all of the carbon in gray cast iron exists in the form of flake graphite in a free state, and its fracture is dark gray. It has certain mechanical properties and good cutting performance, and is widely used in industry. Gray cast iron is basically a eutectic alloy composed of iron, carbon and silicon, in which carbon mainly exists in the form of graphite. If a small amount of inoculant is added to the molten iron before pouring, a large number of highly dispersed refractory particles will be formed, which will become the crystallization core of graphit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C33/08
Inventor 邵元久傅志权骆建军汪小伟唐道贵刘立功杜耀林鲍继昌
Owner HUBEI JIANGHAN HEAVY IND
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