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High temperature carburizing gear steel with fine grains and narrow hardenability bandwidth

A high-temperature carburizing and hardenability technology, applied in the field of carburizing gear steel, can solve the problems of no public stability control, no provision of high-temperature carburizing gear steel, etc., so as to achieve difficult mass production application, less performance fluctuation, and save raw materials cost effect

Active Publication Date: 2017-07-21
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, there is no high-temperature carburized gear steel that makes full use of smelting residual elements to control the grain growth and can meet the needs of continuous casting in industrial production, nor does it disclose the stability of the hardenability bandwidth of gear steel. Chemical composition control technology at ≤4HRC

Method used

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  • High temperature carburizing gear steel with fine grains and narrow hardenability bandwidth
  • High temperature carburizing gear steel with fine grains and narrow hardenability bandwidth
  • High temperature carburizing gear steel with fine grains and narrow hardenability bandwidth

Examples

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Embodiment 1

[0021] Example 1: Invention steel with heat number 1 (C, Si, Mn, Cr, and Mo components are on the line, Al, N is on the lower limit) and comparison steel hot-rolled bar samples are compared at 980 ° C for 6 hours after high-temperature carburization. Grain size of original austenite, take another hardenability sample, normalize at 925°C / 1 hour, and end quench at 925°C to compare its hardenability bandwidth.

Embodiment 2

[0022] Example 2: Invention steel with heat number 2 (C, Si, Mn, Cr, and Mo components on the line, Al, N partial to the middle limit) and comparison steel hot-rolled bar samples were compared at 980°C for 6 hours after high-temperature carburization For the original austenite grain size, take another hardenability sample, normalize at 925°C / 1 hour, and end-quench at 925°C to compare the hardenability bandwidth.

Embodiment 3

[0023] Example 3: Invention steel with heat number 3 (C, Si, Mn, Cr, Mo components on the line, Al, N partial upper limit) and comparison steel hot-rolled bar samples were compared at 1000 ° C for 6 hours after high-temperature carburization Grain size of original austenite, take another hardenability sample, normalize at 925°C / 1 hour, and end quench at 925°C to compare its hardenability bandwidth.

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Abstract

The invention discloses high temperature carburizing gear steel with fine grains and the narrow hardenability bandwidth. The chemical ingredients of the high temperature carburizing gear steel comprise, by weight, 0.19-0.21% of C, 0.20-0.30% of Si, 0.70-0.80% of Mn, 0.010% or smaller of P, 0.005% or smaller of S, 1.10-1.20% of Cr, 0.35-0.38% of Mo, 0.025-0.055% of Al, 0.0015-0.0025% of Ca, 0.0080-0.0200% of N, 0.0015% or smaller of [O], and the balance Fe and inevitable impurities. After the steel is subjected to high-temperature carburizing at the temperature of 980-1000 DEG C, the size of the grains is still kept within the range of 15-20 micrometers, and the grain degree is controlled to be in 7-8 level. In addition, the precise ingredient range for controlling the narrow hardenability bandwidth is obtained for the steel through hardenability model calculation.

Description

technical field [0001] The invention belongs to the field of carburizing gear steel, and is mainly suitable for manufacturing driving and driven gears of rear axles of automobiles, and can also be used for manufacturing other large-sized gear parts. Background technique [0002] With the advancement of automobile manufacturing technology and material production technology, automobiles are developing towards high speed, high load capacity, low noise and light weight, which puts forward higher requirements for special steel for automobile gears. Carburized gear steel is the main gear steel used in automobiles. Carburizing treatment requires long-term heat preservation at high temperature, which consumes a lot of energy and takes a long time. An effective way to reduce the cost of carburizing treatment is to shorten the carburizing time. Tests have shown that when the carburizing temperature is higher than the commonly used 930°C and increased to 1000°C, the carburizing time c...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/22C22C38/60C21D8/06C21D1/55
CPCC21D1/55C21D8/065C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/22C22C38/60
Inventor 胡芳忠汪开忠孙维龚志翔于文坛许兴吴林
Owner MAGANG (GROUP) HOLDING CO LTD
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