Unlock instant, AI-driven research and patent intelligence for your innovation.

Modification treatment agent and method capable of controlling carbides of high-carbon wear-resistant cast steel

A metamorphic treatment and carbide technology, applied in the field of iron and steel smelting, can solve the problems of reduced material hardness, reduced wear resistance, low efficiency, etc., to achieve the effect of improving composition segregation and high impact toughness

Active Publication Date: 2022-01-14
浙江杰雄新材料科技有限责任公司
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large carbides contain alloying elements, resulting in uneven distribution of alloying elements, which not only deteriorates the mechanical properties of cast steel, but also reduces the hardness of the material and reduces the wear resistance
In order to improve the distribution of carbides in cast steel, the method of increasing the cooling rate is usually used to suppress the growth of carbides, but it is difficult to achieve rapid cooling for large castings
For this reason, subsequent refinement of carbides through high-temperature homogenization heat treatment process not only increases energy consumption, but also has low efficiency. If the cooling rate is not well controlled, it is easy to crack

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Modification treatment agent and method capable of controlling carbides of high-carbon wear-resistant cast steel
  • Modification treatment agent and method capable of controlling carbides of high-carbon wear-resistant cast steel
  • Modification treatment agent and method capable of controlling carbides of high-carbon wear-resistant cast steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The main components of the high carbon cast steel in this embodiment are: C: 0.8%, Cr: 4.5%, Mo: 0.5%, V: 0.5%. According to the method for controlling carbides of the present invention, implementing the control of the component casting carbides mainly includes the following steps:

[0032] Using a 100kg intermediate frequency furnace to smelt 100kg molten steel in an atmospheric environment, taking into account the burning loss of alloy elements, the composition is controlled within the upper limit of the allowable range;

[0033] After completely melting and holding for 5 minutes, refine in the furnace. The weight percentage of each component of the refining slag system is: 25% CaO, 20% SiO 2 , 40% Al 2 o 3 , 15% MgO, etc.;

[0034] After refining for 20 minutes, feed the wire and add a melt treatment agent. The composition of the melt treatment agent is: 40% rare earth ferrosilicon (wherein the rare earth content is 31%), 30% aluminum calcium alloy, and other trac...

Embodiment 2

[0041] The main components of the high carbon cast steel in this embodiment are: C: 1.3%, Cr: 5.0%, Mo: 0.6%, V: 0.6%. According to the method for controlling carbides of the present invention, implementing the control of the component casting carbides mainly includes the following steps:

[0042] Using a 100kg intermediate frequency furnace to smelt 100kg molten steel in an atmospheric environment, taking into account the burning loss of alloy elements, the composition is controlled within the upper limit of the allowable range;

[0043] After completely melting and holding for 5 minutes, refine in the furnace. The weight percentage of each component of the refining slag system is: 25% CaO, 20% SiO 2 , 40% Al 2 o 3, 15% MgO, etc.;

[0044] After refining for 20 minutes, feed the wire and add a melt treatment agent. The composition of the melt treatment agent is: 60% rare earth ferrosilicon, 20% aluminum calcium alloy, and 20% of other trace alloy elements M. The trace elem...

Embodiment 3

[0051] The main components of the high carbon cast steel in this embodiment are: C: 1.7%, Cr: 4.5%, Mo: 0.5%, V: 0.6%. According to the method for controlling carbides of the present invention, implementing the control of the component casting carbides mainly includes the following steps:

[0052] Using a 100kg intermediate frequency furnace to smelt 100kg molten steel in an atmospheric environment, taking into account the burning loss of alloy elements, the composition is controlled within the upper limit of the allowable range;

[0053] After completely melting and holding for 5 minutes, refine in the furnace. The weight percentage of each component of the refining slag system is: 25% CaO, 20% SiO 2 , 40%Al 2 o 3 , 15% MgO, etc.;

[0054] After refining for 20 minutes, feed the wire and add a melt treatment agent. The composition of the melt treatment agent is: 50% rare earth ferrosilicon, 25% aluminum-calcium alloy, and 25% of other trace alloy elements M, and the trace ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Impact toughnessaaaaaaaaaa
Impact toughnessaaaaaaaaaa
Impact toughnessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for refining and passivating as-cast carbides of high-carbon wear-resistant cast steel through melt modification treatment and controlling the morphology, size and distribution of the carbides in combination with subsequent heat treatment. The carbide control method comprises the following steps that smelting is performed by an induction furnace or an electric furnace, LF refining is performed, a proper amount of a melt modifier is added in a wire feeding manner, a casting is poured, the casting is annealed, the casting is quenched or normalized, and the casting is tempered; LF refining is selectively performed according to the cast steel refining technology requirement, and if LF refining is not needed, the next step is directly performed; after selective LF refining, the proper amount of the melt modification treatment agent is added in the wire feeding manner; the casting is subjected to heat treatment by adopting corresponding technology parameters according to cast steel components. By means of the method, the carbides in the high-carbon wear-resistant steel in the as-cast state can be effectively controlled, and component segregation of the casting is improved while the as-cast carbides are refined and passivated. Through subsequent heat treatment, the spherical carbides with the nanometer size are dispersed and distributed in the steel matrix.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and relates to a modification treatment agent for controlling carbides of high-carbon wear-resistant cast steel, in particular to a method for controlling carbides of high-carbon wear-resistant cast steel with high hardness and good toughness and the method used therein Modification agent. Background technique [0002] Hammer heads, grinding balls, liners and other key components of mining machinery and engineering machinery need materials with good wear resistance and certain toughness. Cast steel and cast iron are the most widely used wear-resistant materials in mining machinery. These materials have the characteristics of plasticity and recyclability. In general, the higher the hardness of the wear-resistant material, the better the wear resistance. High chromium (23-35wt%) white cast iron is a typical material of high hardness (~HRC 60) wear-resistant cast iron, but its high cost, low...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C21C7/00C22C33/06C22C38/22C22C38/24C21D1/18C21D1/26C21D1/28C21D6/00
CPCC21C7/0006C22C33/06C22C38/22C22C38/24C21D1/26C21D1/28C21D1/18C21D6/002C21D2211/008C21D2211/004Y02P10/20
Inventor 闫志杰
Owner 浙江杰雄新材料科技有限责任公司