A high-strength, low-sulfur, high-manganese inoculated gray cast iron material and its melting and pouring process

A gray cast iron, high-strength technology, applied in the field of high-strength, low-sulfur, high-manganese inoculated gray cast iron materials and its melting and pouring technology, can solve the problem that the core strength of thick and large pieces is difficult to meet the requirements, the graphite form is not stable, and the molten iron is pure Eliminate carbides and supercooled structures, improve the mechanical properties and processing properties of castings, and achieve obvious inoculation effects

Active Publication Date: 2021-10-12
湖南佳海电梯设备制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sulfur content of existing gray cast iron is above 0.05%, and the gray cast iron molded after mixing with Mn and other components has low strength and unstable graphite form
[0004] Moreover, the existing gray cast iron only uses one inoculation during smelting and pouring, and ferrosilicon inoculant is generally used for inoculation, so that the purity of molten iron is low and the graphite grains are too large
[0005] Moreover, the existing gray cast iron mold is single, and the core strength of thick and large pieces is difficult to meet the requirements

Method used

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  • A high-strength, low-sulfur, high-manganese inoculated gray cast iron material and its melting and pouring process
  • A high-strength, low-sulfur, high-manganese inoculated gray cast iron material and its melting and pouring process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A high-strength, low-sulfur, high-manganese inoculated gray cast iron material, the composition of which is expressed in weight percent:

[0039] Carbon 3.18%, silicon 1.95%, manganese 0.9%, phosphorus 0.03%, sulfur 0.03%.

[0040] A smelting and pouring process for a high-strength, low-sulfur, high-manganese inoculated gray cast iron material comprises the following steps:

[0041] 1) Add crushed steel, pig iron, furnace charge, and recarburizer into an intermediate frequency induction furnace, and turn on the furnace for smelting; the recarburizer is silicon carbide.

[0042] 2) Control the temperature of the electric furnace within the range of 1500°C and continue heating for 10 minutes;

[0043] 3) Obtain molten iron from the electric furnace through a sampling spoon, and detect the content of each element in the molten iron through a metal element analyzer. If the composition is unqualified, keep heating and add missing elements for adjustment. If the composition ...

Embodiment 2

[0049] A high-strength, low-sulfur, high-manganese inoculated gray cast iron material, the composition of which is expressed in weight percent: 3.05% carbon, 1.85% silicon, 0.8% manganese, 0.05% phosphorus, and 0.049% sulfur.

[0050] A smelting and pouring process for a high-strength, low-sulfur, high-manganese inoculated gray cast iron material comprises the following steps:

[0051] 1) Add crushed steel, pig iron, furnace charge, and recarburizer into an intermediate frequency induction furnace, and turn on the furnace for smelting; the recarburizer is silicon carbide.

[0052] 2) Control the temperature of the electric furnace within the range of 1540°C and continue heating for 8 minutes;

[0053] 3) Obtain molten iron from the electric furnace through a sampling spoon, and detect the content of each element in the molten iron through a metal element analyzer. If the composition is unqualified, keep heating and add missing elements for adjustment. If the composition is qua...

Embodiment 3

[0058] Example 3: A high-strength, low-sulfur, high-manganese inoculated gray cast iron material, the components of which are expressed in weight percent: 3.2% carbon, 2.05% silicon, 1.4% manganese, 0.01% phosphorus, and 0.01% sulfur.

[0059] The components of the gray cast iron material are represented by weight percent: 3.12% carbon, 1.96% silicon, 1.2% manganese, 0.05% phosphorus, and 0.01% sulfur. In the final casting, its components and the weight percentage of each component are: 3.18% carbon, 1.95% silicon, 0.9% manganese, 0.03% phosphorus, and 0.03% sulfur.

[0060] A smelting and pouring process for a high-strength, low-sulfur, high-manganese inoculated gray cast iron material comprises the following steps:

[0061] 1) Add crushed steel, pig iron, furnace charge, and recarburizer into an intermediate frequency induction furnace, and turn on the furnace for smelting; the recarburizer is silicon carbide.

[0062] 2) Control the temperature of the electric furnace with...

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Abstract

The invention relates to a high-strength, low-sulfur, high-manganese inoculated gray cast iron material. The components of the gray cast iron material are represented by weight percentage: carbon 3.05-3.2%, silicon 1.85-2.05%, manganese 0.8-1.4%, phosphorus ≤ 0.05%, sulfur <0.05%. It also provides a production process for producing the high-strength, low-sulfur, high-manganese inoculated gray cast iron material. The present invention not only adopts synthetic cast iron technology, but also uses silicon carbide and silicon barium zirconium inoculants, and utilizes iron molds covered with sand to cast Under the mold conditions, high-strength low-sulfur high-manganese inoculated gray cast iron was cast.

Description

technical field [0001] The invention relates to the field of casting, in particular to a high-strength, low-sulfur, high-manganese inoculated gray cast iron material and a melting and pouring process thereof. Background technique [0002] Gray cast iron refers to cast iron with flake graphite. Because the fracture is dark gray when broken, it is called gray cast iron, and its output accounts for more than 80% of the total output of cast iron. Gray cast iron is divided into ferrite matrix gray cast iron, pearlite-ferrite matrix gray cast iron, and pearlite matrix gray cast iron. Different gray cast irons can be used according to the different directions of castings to meet the requirements of use. They are generally used in hydraulic parts. Gray cast iron with a pearlitic matrix is ​​required. [0003] The sampling part of the hydraulic parts is close to the middle of the solid part of the casting. Multiple samplings have found that there are problems such as low hardness, l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C33/08C21C1/08
CPCC21C1/08C22C33/08C22C37/10Y02P10/20
Inventor 贾志龙蓝天星陈序良韦秋拧周光文
Owner 湖南佳海电梯设备制造有限公司
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