Nitriding steel for shaft type materials and preparing method of nitriding steel

A technology for nitriding steel and shafts, which is applied in metal material coating technology, metal rolling, coating, etc., can solve the problems of less continuous casting furnaces, poor steel surface quality, and brittle nitrided layer, etc., and achieve good The effect of comprehensive mechanical properties, good cutting performance and good hardenability

Inactive Publication Date: 2016-08-31
ANQING JIAN AUTO PART FORGING & ROLLING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high content of aluminum in the traditional nitrided steel causes many inclusions in the steel, poor surface quality of the steel and brittle nitrided layer after nitriding heat treatment
The traditional nitrided steel 38CrMoAl is difficult to produce and the number of continuous casting furnaces is small. Therefore, many steel factories still use the die-casting process for production, which makes it difficult to control the quality and cost of steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1, a nitrided steel for shaft materials, containing C: 0.2%-0.3%, Si: 0.1-1%, Mn: 0.5-1%, Cr: 1%-1.2%, S : 0.001~0.030%, Al: 0.1~0.5%, Ti: 0.6%~1.2%, Ni: 0.05~0.2%, the remainder includes Fe and unavoidable impurities; and the following elements are limited: P: 0.02% or less , O: 0.06% or less.

[0013] A method for preparing nitrided steel for shaft materials, smelting: using an electric arc furnace for smelting, the ingredients are molten iron with a weight percentage greater than or equal to 40% and scrap steel with a weight percentage of 40% to 60%, and the control endpoint C is ≥ 0.2%. P≤0.020%, the content of residual elements meets the design requirements, the tapping temperature of molten steel is 1600℃~1650℃, among which, pre-deoxidation alloying is carried out in the ladle, and Al is added during the tapping process; then, LF refining is carried out outside the furnace, refining Argon is blown throughout the process, and the white slag time is kept...

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Abstract

The invention discloses nitriding steel for shaft type materials and a preparing method of the nitriding steel. The nitriding steel comprises, by weight percent, 0.2%-0.3% of C, 0.1%-1% of Si, 0.5%-1% of Mn, 1%-1.2% of Cr, 0.001%-0.030% of S, 0.1%-0.5% of Al, 0.6%-1.2% of Ti, 0.05%-0.2% of Ni and the balance Fe and inevitable impurities. The content of the element P is limited to be lower than 0.02%, and the content of the element O is limited to be lower than 0.06%. According to the nitriding steel for the shaft type materials and the preparing method of the nitriding steel, the technical problems in the aspects of a traditional nitriding steel production technology, quality and using can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of production and processing of shaft parts, in particular to a nitrided steel for shaft materials and a preparation method thereof. Background technique [0002] After nitriding heat treatment, nitrided steel has high surface hardness (HV950-1200, equivalent to HRC65-72), wear resistance and fatigue strength, and has good heat resistance and corrosion performance; moreover, the nitrided steel's High hardness can be maintained up to about 600°C. Nitrided steel shows good performance in some special working conditions, and is mainly used in machinery manufacturing, aviation industry and military industry and other fields. In recent years, the market demand for nitrided steel has risen rapidly. The traditional nitrided steel 38CrMoAl is an alloy structural steel, and it is a special nitriding steel. The steel has good hardenability, and at the same time, the high temperature temper brittleness is suppressed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/06C22C38/08C22C38/14C22C33/04C23C8/26B21B1/02
CPCC22C38/02B21B1/026C22C33/04C22C38/04C22C38/06C22C38/08C22C38/14C22C38/18C23C8/26
Inventor 査凌宇
Owner ANQING JIAN AUTO PART FORGING & ROLLING
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