Carburizing alloy steel, and preparation method and application thereof

An alloy steel and carburizing technology, applied in the field of iron-based alloys, can solve the problems of inability to meet the requirements of heavy-duty gears and poor comprehensive mechanical properties, and achieve excellent grain growth resistance, low production costs, and high yield strength than the effect

Active Publication Date: 2014-10-22
CRRC QISHUYAN INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of Ni and Mo elements in this gear steel is low, and its comprehensive mechanical properties are poor, which cannot meet the requirements of heavy-duty gears.

Method used

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  • Carburizing alloy steel, and preparation method and application thereof
  • Carburizing alloy steel, and preparation method and application thereof
  • Carburizing alloy steel, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The components and mass percentages of the carburizing alloy steel in this embodiment are: C: 0.18%, Si: 0.16%, Mn: 0.69%, P: 0.009%, S: 0.005%, Cr: 1.00%, Ni: 3.55 %, Mo: 0.62%, Al: 0.04%, V: 0.05%, Nb: 0.03%, N: 0.0092%, O: 0.0019%, H: 0.00015%, and the balance is iron and unavoidable impurities.

[0050] The preparation method of the carburized alloy steel of the present embodiment comprises the following specific steps:

[0051] A. According to the composition and content of the alloy steel, the ingredients are prepared, and the steelmaking and refining process of electric furnace + ladle refining furnace (LF) + vacuum degassing furnace in the prior art is used for alloy melting.

[0052] B. Cast steel ingots, roll the steel ingots into round steel, and take sample blanks on the round steel according to the national standard GB / T2975-1998 "Sampling Position and Sample Preparation for Mechanical Properties Test of Steel and Steel Products".

[0053] C. Normalize and...

Embodiment 2

[0056] The components and mass percentages of the carburized alloy steel in this embodiment are: C: 0.15%, Si: 0.20%, Mn: 0.95%, P: 0.008%, S: 0.006%, Cr: 1.20%, Ni: 3.75 %, Mo: 0.41%, Al: 0.08%, V: 0.12%, N: 0.0080%, O: 0.0016%, H: 0.00016%, and the balance is iron and unavoidable impurities.

[0057] The preparation method of the carburized alloy steel of the present embodiment comprises the following specific steps:

[0058] A. According to the composition and content of the alloy steel, the ingredients are prepared, and the steelmaking and refining process of electric furnace + ladle refining furnace (LF) + vacuum degassing furnace in the prior art is used for alloy melting.

[0059] B. Cast steel ingots, roll the steel ingots into round steel, and take sample blanks on the round steel according to the national standard GB / T2975-1998.

[0060] C. Normalize and temper the sample blank. First raise the temperature of the blank to 900°C, keep it warm for 1 hour, and cool it...

Embodiment 3

[0063] The components and mass percentages of the carburizing alloy steel in this embodiment are: C: 0.23%, Si: 0.14%, Mn: 0.45%, P: 0.008%, S: 0.004%, Cr: 0.45%, Ni: 3.05 %, Mo: 0.79%, Al: 0.02%, Nb: 0.09%, N: 0.0078%, O: 0.0012%, H: 0.00013%, and the balance is iron and unavoidable impurities.

[0064] The preparation method of the carburized alloy steel of the present embodiment comprises the following specific steps:

[0065] A. According to the composition and content of the alloy steel, the ingredients are prepared, and the steelmaking and refining process of electric furnace + ladle refining furnace (LF) + vacuum degassing furnace in the prior art is used for alloy melting.

[0066] B. Cast steel ingots, roll the steel ingots into round steel, and take sample blanks on the round steel according to the national standard GB / T2975-1998.

[0067] C. Normalize and temper the sample blank. First raise the blank to 920°C, keep it warm for 1 hour, and cool it to room temperat...

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Abstract

The invention relates to carburizing alloy steel, and a preparation method thereof. The alloy of the carburizing alloy steel comprises, by mass, 0.15%-0.25% of C, less than or equal to 0.30% of Si, 0.30%-1.20% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.30%-1.50% of Cr, 2.80%-3.80% of Ni, 0.30%-1.00% of Mo, 0.01%-0.08% of Al, at least one selected from 0.05%-0.15% of V and 0.025-0.10% of Nb, and the balance being Fe and inevitable impurities. A mass percentage of V, Nb and Al meets an equation of V+Nb+Al <= 0.30%. The carburizing alloy steel provided by the invention has good anti-fatigue performance, excellent comprehensive properties, good hardenability, high yield ratio, extremely small internal oxidation and the characteristic of resisting grain growth at a high temperature, and is suitable for manufacturing heavy-duty gears.

Description

technical field [0001] The invention relates to an alloy steel, in particular to a carburized alloy steel suitable for manufacturing heavy-duty gears, and belongs to the field of iron-based alloys. Background technique [0002] There are many types of carburizing steel that can be used in the world, but there are relatively few high-quality carburizing steels with high performance. Carburized steel for heavy-duty gears must have superior hardenability, finer grain size, smaller internal oxidation, high fatigue performance and good comprehensive mechanical properties. [0003] At present, my country's locomotive gears with an axle load of 25 tons or more, high-power wind power generation gears and high-power mining machinery gears usually use high-grade high-quality carburizing steels such as 20Cr2Ni4, 18Cr2Ni4W, 17Cr2Ni2Mo. These existing carburizing steels for heavy-duty gears have unreasonable composition matching, unsatisfactory comprehensive mechanical properties, and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C22C38/46
CPCC22C38/46C22C38/48
Inventor 文超董雯刘忠伟陈亮梁会雷徐宁
Owner CRRC QISHUYAN INSTITUTE CO LTD
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