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Method for improving carburization temperature by microalloying and surface carburization method for low-carbon steel

A technology of micro-alloying and low-carbon steel, which is applied in the field of carburizing heat treatment of low-carbon steel or low-carbon alloy steel, can solve the problems of low carburizing temperature, large energy consumption, and long process cycle, so as to shorten the cycle and reduce the Effect of diffusion time and energy consumption reduction

Inactive Publication Date: 2019-09-10
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a kind of method that utilizes microalloying to improve carburizing temperature, by adding microalloying element in low carbon steel or low carbon alloy steel, to improve the carburizing temperature of low carbon steel or low carbon alloy steel thereby Increase the carburizing speed to solve the problems of low carburizing temperature, long process cycle and large energy consumption in the traditional carburizing heat treatment process

Method used

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  • Method for improving carburization temperature by microalloying and surface carburization method for low-carbon steel
  • Method for improving carburization temperature by microalloying and surface carburization method for low-carbon steel
  • Method for improving carburization temperature by microalloying and surface carburization method for low-carbon steel

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Embodiment 1

[0042] The workpieces produced by 18CrNiMo7-6 carburizing steel are widely used in wind power, port reducer and high-speed locomotive and other industries. The main chemical composition of 18CrNiMo7-6 experimental steel: 0.17%C, 0.18%Si, 0.60%Mn, 1.50%Cr, 1.48%Ni, 0.30%Mo. The 18CrNiMo7-6 steel with this chemical composition is designed for microalloying, and Nb is added to make the Nb content in the alloy 0.06%.

[0043] Then the grain size of the 18CrNiMo7-6 steel sample after microalloying was determined. The experimental steel sample is placed in a vacuum furnace, and the temperature is raised to the holding temperature with the furnace. After holding for a certain period of time, it is taken out of the furnace and quenched in oil. The sample after quenching was prepared for metallography, and the structure with obvious grain boundaries was obtained after corrosion, and the grain size was measured.

[0044] Experimental conditions: holding temperatures were 900°C, 950°C,...

Embodiment 2

[0050] 20CrMn carburizing steel is widely used in structural parts such as gear shafts, gears, water pump rotors, clutches, small shafts, mandrels and bolts that work at high speeds and high loads without strong impact loads. The main chemical composition of the experimental steel: 0.18%C, 0.20%Si, 1.05%Mn, 1.17%Cr. The 20CrMn steel with this chemical composition is micro-alloyed, and Ti is added to make the Ti content in the alloy 0.06%, so that the 20CrMnTi carburizing steel with the highest market share in our country is obtained.

[0051] Grain size determination was then carried out on the 20CrMnTi steel samples. The experimental steel sample is placed in a vacuum furnace, and the temperature is raised to the holding temperature with the furnace. After holding for a certain period of time, it is taken out of the furnace and quenched in oil. The sample after quenching was prepared for metallography, and the structure with obvious grain boundaries was obtained after corros...

Embodiment 3

[0057] 17Cr2Ni2Mo steel is a localized brand of Cr-Ni-Mo gear steel developed by German ZF company. It is widely used in the production of gears, bevel gears and other transmission parts, reducer parts, butterfly wheels, friction parts, etc. The main chemical composition of the experimental steel: 0.18%C, 0.22%Si, 0.55%Mn, 1.65%Cr, 1.70%Ni, 0.28%Mo. The 17Cr2Ni2Mo steel with this chemical composition is designed for microalloying, and the combined microalloying elements of Nb and V are added, so that the Nb content in the alloy is 0.06%, and the V content is 0.10%.

[0058] Subsequently, the grain size determination of the microalloyed 17Cr2Ni2Mo steel samples was carried out. The experimental steel sample is placed in a vacuum furnace, and the temperature is raised to the holding temperature with the furnace. After holding for a certain period of time, it is taken out of the furnace and quenched in oil. The sample after quenching was prepared for metallography, and the struc...

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Abstract

The invention belongs to the technical field of carburizing and heat treatment for low-carbon steel or low-carbon alloy steel, and particularly relates to a method for improving carburization temperature by microalloying and a surface carburization method for the low-carbon steel. The methods comprise the steps of selecting the low-carbon steel or low-carbon alloy steel material with carbon content less than 0.25%, carrying out alloy component design, and adding microalloy elements of Nb, Ti, a combination of Nb and V, a combination of Ti and V, or a combination of NB, Ti and V, so that the carburization temperature of the low-carbon steel or the low-carbon alloy steel is improved, the carburization rate is further improved, the cycle of the carburization process is shortened, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of carburizing heat treatment of low-carbon steel or low-carbon alloy steel, in particular to a method for increasing carburizing temperature by microalloying and a surface carburizing method for low-carbon steel. Background technique [0002] Carburizing is the process of infiltrating carbon atoms into the surface layer of steel. It is also to make the workpiece of low carbon steel (with a carbon content less than 0.25%) have a surface layer of high carbon steel, and then after quenching and low temperature tempering, the surface layer of the workpiece has high hardness and wear resistance, while the central part of the workpiece It still maintains the toughness and plasticity of low carbon steel. [0003] High-temperature carburizing has the characteristics of environmental protection, high efficiency and low cost, and is one of the important directions for the development of carburizing technology. Incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/12C23C8/22
CPCC22C38/12C22C38/14C23C8/22
Inventor 田勇王斌安小雪何艳萍王昊杰贾涛王丙兴王昭东
Owner NORTHEASTERN UNIV
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